CN109055657A - The tough bainite steel plate of 690MPa grades of high strength and low costs and its production technology - Google Patents
The tough bainite steel plate of 690MPa grades of high strength and low costs and its production technology Download PDFInfo
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- CN109055657A CN109055657A CN201810909176.7A CN201810909176A CN109055657A CN 109055657 A CN109055657 A CN 109055657A CN 201810909176 A CN201810909176 A CN 201810909176A CN 109055657 A CN109055657 A CN 109055657A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/52—Manufacture of steel in electric furnaces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
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- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
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- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C21D6/001—Heat treatment of ferrous alloys containing Ni
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- C21D6/005—Heat treatment of ferrous alloys containing Mn
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- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
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Abstract
The invention discloses a kind of tough bainite steel plate of 690MPa grades of high strength and low cost and its production technologies, steel plate chemical component composition and its mass percentage are C:0.03~0.09%, Si:0.10~0.30%, Mn:1.50~1.80%, Nb:0.030~0.070%, Ti≤0.02%, Mo:0.10~0.40%, Ni:0.20~0.30%, Alt≤0.045%, Bt≤0.002%, and surplus is Fe and inevitable impurity；Production technology includes smelting, continuous casting, heating, rolling and heat treatment procedure.Steel plate of the present invention has the characteristics that low-welding crack-sensitive coefficient, low carbon content, low cost, it solves the carbon content of quenched steel grade and the problems such as carbon equivalent is high and welding performance is poor, can satisfy the fields steel requirements such as China's engineering machinery, heavily loaded bridge, energy-saving vehicle, pipeline, ship, ocean platform.
Description
Technical field
The invention belongs to metallurgical technology fields, and in particular to a kind of tough bainite steel plate of 690MPa grades of high strength and low cost and its
Production technology.
Background technique
Low-carbon bainite steel is the new steel that high intensity developed in recent years, high tenacity, welding performance are excellent in the world
Kind, it is known as the steel material of 21 century, is the newest product of modern metallurgical technology development.Early in the 1960s, Irwin
With nose of bainite of the Pickering discovery when the mass fraction of carbon in steel is close to zero, in the continuous cooling transformation (CCT) curve of steel
It will move to left, so that forming bainite structure under wide range of cooling rate, and martensite and shellfish under this condition
The strength difference of family name's body tissue between the two reaches negligible degree.Coldren et al. provides bainite and starts transformation temperature
Degree and the linear relationship of intensity, due to lacking the invigoration effect of carbon, can be obtained by solution strengthening be more than 690MPa height it is in the wrong
Take intensity.In addition, McEvily et al. has delivered a research report in relation to bainitic steel in 1967, developing composition is
The ultra-low-carbon bainite steel of 0.03%C, 0.7%Mn, 3%Mo, 3%Ni, 0.05%Nb, after thermomechanically being controlled technique (TMCP) processing,
The yield strength of the steel has reached 770MPa, and has good low-temperature flexibility, and the steel grade welding performance is excellent, while
Emphasize the cleanliness of steel with Ultra-low carbon the same toughness that can improve rolled plate, but the disadvantage is that joined a large amount of valuable conjunction in steel
Gold element, it is expensive, it is not used widely.U.S. Bcthlchcm Steel deliver about low-carbon bainite steel
In document, the Design of Chemical Composition of low-carbon bainite steel there is a problem of same, and the content of Cr, Mo have respectively reached 2.23%
With 2.35%, not only higher cost, and also being excessively increased for Cr, Mo content significantly reduces the toughness of steel, and it is wide also without obtaining
General application.
Japanese Nippon iron company successfully develops the major diameter high-voltage tube that cold zone uses the 1980s
Line ULCB steel, the composition (mass fraction) of this steel: 0.02%C, 2.0%Mn, 0.4%Ni, 0.3%Mo, 0.04%Nb, 0.02%Ti,
0.001%B inhibits polygonal ferrite forming core using Nb-B, Ti-B or Mo-Nb-B, promotes the strong effect of phase transformation strengthening, through controlling
The plate for making rolling thickness 20mm can obtain 550MPa grades of yield strength, and have excellent low-temperature flexibility, Er Qie great
Width reduces the alloy content in steel, indicates that low-carbon bainite steel enters new developing stage.
In the 21st century, Japan and the U.S. are to the research Showed Very Brisk of ULCB steel, and Kawasaki, Japan Inland Steel was in 2003
Using rolling rear direct quenching and tempering process produces HT780ULCB, ingredient 0.02%C, 0.23%Si, 2.00%Mn,
0.035%Al, 0.013%Ti separately have a certain amount of Cu, Ni, Cr, Mo, cool attenuation indices P cm=0.21%, 50mm thickness
The yield strength of steel plate is 713MPa, and tensile strength 830MPa, elongation percentage 21%, Akv-40 DEG C is 179J；According to newest report
Road, Japan have gone out the bridge and the special thick ultra-low-carbon bainite steel of 75mm for building of tensile strength 590MPa.
Compared with foreign countries, China carries out the research of low-carbon bainite steel later, by the development of nearly more than ten years, especially
A series of 973 and 863 project about 8 years basic theories and application study, it has been proposed that the new original of middle temperature transformation microstructure ultra-fining treatments
Reason, develops a set of patent technology of suitable mass production.
Last century Mo, wuhan iron & steel croup co. company applied Publication No. CN1218115A one kind " copper boron system's low-carbon and
The patent of ultra-low carbon bainite high strength steel ", it is believed that the carbon content in steel is down to it is relatively difficult between 0.02~0.05%, because
This does not form series of products finally by carbon content control 0.08%.
Since the 21th century, with the sustained and rapid development of China's economy, each industrial circle is to think gauge high strength steel
The demand further expansion of plate, since there is low-carbon bainite steel excellent obdurability to match, the technological process of production is short, cost phase
To it is lower the advantages that, therefore domestic each main iron and steel enterprise has all carried out the development work of think gauge low-carbon bainite steel in succession,
And certain production scale is formd, have accumulated more rich experience.
Wuyang iron company uses the techniques such as electric furnace and external refining, the controlled rolling of 4200mm milling train, cooling control after rolling, passes through
Multiple alloy design carries out ageing treatment appropriate, exploitation by strict control heating, rolling and cooling parameter, and to steel plate
Obdurability is gone out and has matched good low-carbon bainite steel, the maximum gauge of steel plate reaches 50mm.Mechanical property reaches following requirements:> 590MPa,> 685,Akv >=47J that 19%, -20 DEG C of >.
Jinan iron company is in the development work for having carried out low-carbon bainite steel JG700 in recent years, the main thickness for using 270mm
Slab is rolled on Stand Mill heavy and medium plate mill, rolls rear process of thermal treatment using TMCP+, the yield strength of product reaches
To 550~640MPa, tensile strength reaches 720~770MPa, and 0 DEG C of ballistic work is more than 100J, and elongation percentage is relatively low, be 16~
18%。
Anyang iron company successfully developed the D grade low-carbon bainite steel AH70DB of 700MPa in 2007, using TMCP
Technique, not thermally treated after rolling, product has good comprehensive performance and solderability, 550~620MPa of yield strength, tension
670~710MPa of intensity, elongation percentage average out to 19%, and there is good impact flexibility at -20 DEG C, product is own to form batch
Scale is successfully applied to coal machine profession, achieves good economic benefit.
As it can be seen that the production of the high-strength steel of most domestic mostly uses heavy and medium plate mill to carry out at present, while in order to guarantee foot
Enough reduction ratios are generally used heavy slab (> 200mm), are rolled using TMCP technique, even if at the heat after rolling
Reason, intensity highest also only reaches the slightly above level of 600MPa, and low-temperature flexibility is lower, specifies only -20 DEG C of ballistic work.
From the point of view of current development, the demand to the intensity more excellent thick steel plates of high and low temperature toughness will be increasing, but for
Yield strength reaches 700MPa and the production of the higher E grades of steel plate of low-temperature flexibility there is no relevant report.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of tough bainite steel plates of 690MPa grades of high strength and low cost；The present invention
Additionally provide a kind of production technology of tough bainite steel plate of 690MPa grades of high strength and low cost.
In order to solve the above technical problems, the technical solution adopted by the present invention is that: a kind of tough shellfish of 690MPa grades of high strength and low cost
Family name's body steel plate, steel plate chemical component composition and its mass percentage be C:0.03~0.09%, Si:0.10~0.30%,
Mn:1.50~1.80%, Nb:0.030~0.070%, Ti≤0.02%, Mo:0.10~0.40%, Ni:0.20~0.30%, Alt≤
0.045%, Bt≤0.002%, surplus are Fe and inevitable impurity.
Steel plate group of the present invention is woven to tempering bainite, and steel plate thickness is 5~40mm, carbon equivalent Ceq≤0.45%, weldering
Connect crack-sensitivity FACTOR P cm≤0.22%.
Calculation formula is as follows: Ceq=C+Mn/6+Cr/5+Mo/4+V/14+Ni/40+Si/24；Pcm=C+Si/30+Mn/
20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5B。
Steel plate yield strength >=700MPa of the present invention, 770~900MPa of tensile strength, yield tensile ratio≤0.92 extend
Rate A50>=16%, -40 DEG C of impact of collision function >=120J.
The present invention also provides a kind of production technology of the tough bainite steel plate of 690MPa grades of high strength and low cost, the production work
Skill includes smelting, continuous casting, heating, rolling and heat treatment procedure；The rolling process, using two-stage control rolling mill practice, essence
Rolling stage start rolling temperature is 860~920 DEG C, and finishing temperature is 770~820 DEG C；The heat treatment procedure, using tempering process,
Tempering temperature is 560~620 DEG C.
Rolling process of the present invention, using recrystallization and the controlled rolling of non-recrystallization two stages, rough rolling step temperature is 1000
~1120 DEG C, dry in the air steel thickness >=2.5H, and the H is the thickness of finished steel plate.
Rolling process of the present invention, rolls rear water cooling, and cooling velocity control exists in 15~20 DEG C/s, final cooling temperature control
470~520 DEG C.
Heat treatment procedure of the present invention, 3.5~5.0min/mm of tempering insulation time, comes out of the stove and is air-cooled to room temperature.
Smelting procedure of the present invention, molten steel refine, depth deoxidation, desulfurization are according to target wanted through electric furnace smelting into LF furnace
It seeks adjustment molten steel composition, carries out Fruit storage when liquid steel temperature is up to 1540~1590 DEG C.
Continuous casting working procedure of the present invention, continuous casting obtain the steel billet of 200~350mm of thickness, Chemical Composition in Cast Billet composition and its
Mass percentage is C:0.03~0.09%, Si:0.10~0.30%, Mn:1.50~1.80%, Nb:0.030~0.070%, Ti
≤ 0.02%, Mo:0.10~0.40%, Ni:0.20~0.30%, Alt≤0.045%, Bt≤0.002%, surplus are Fe and can not keep away
The impurity exempted from.
Heating process of the present invention, heating temperature are 1180~1270 DEG C.
The tough bainitic steel panel products canonical reference GB/T1591-2008 of 690MPa grades of high strength and low cost of the present invention；Product
It can detection method canonical reference GB/T288.1-2010, GB/T229-2007.
The beneficial effects of adopting the technical scheme are that the Design of Chemical Composition noble metal of 1, steel plate of the present invention
Content is low, significantly reduces production cost.2, the present invention uses TMCP+ tempering process, produces yield strength up to 690MPa's
High-intensitive E grades of thickness 5~40mm steel plate.3, the present invention takes online controlled rolling and controlled cooling production technology, is tempered after rolling, and existing
Modifier treatment steel is compared, and can be exempted heating quenching process, be shortened process flow, reduce costs.4, produced by the invention
690MPa grades of high strength and low costs tough bainite steel plate yield strength >=700MPa, 770~900 MPa of tensile strength, yield tensile ratio≤
0.92, elongation percentage A50>=16%, -40 DEG C of ballistic work >=120J, and there is low-welding crack-sensitive coefficient, low carbon content, low
The features such as cost and simple production process, solves the carbon content of quenched steel grade and the problems such as carbon equivalent is high and welding performance is poor.
5, the present invention can satisfy China's engineering machinery, heavily loaded bridge, energy-saving vehicle, pipeline, ship, ocean platform, etc. fields to height
Intensity, high tenacity, easily welding, the requirement of long-life, inexpensive steel, have filled up China in the blank in the field, have had very strong
Adaptability and promotional value, while cost performance with higher and good market prospects.
Detailed description of the invention
Fig. 1 is the micro-organization chart of the tough bainite steel plate of 1 690MPa grades of high strength and low cost of embodiment；
Fig. 2 is the micro-organization chart of the tough bainite steel plate of 2 690MPa grades of high strength and low cost of embodiment；
Fig. 3 is the micro-organization chart of the tough bainite steel plate of 3 690MPa grades of high strength and low cost of embodiment；
Fig. 4 is the micro-organization chart of the tough bainite steel plate of 4 690MPa grades of high strength and low cost of embodiment；
Fig. 5 is the micro-organization chart of the tough bainite steel plate of 5 690MPa grades of high strength and low cost of embodiment.
Specific embodiment
The present invention is described in further detail in the following with reference to the drawings and specific embodiments.
Embodiment 1
The tough bainite steel plate of 690MPa grades of high strength and low costs of the present embodiment with a thickness of 40mm, chemical component composition and quality hundred
Divide content are as follows: C:0.07%, Si:0.20%, Mn:1.61%, Nb:0.050%, Ti:0.01%, Mo:0.30%, Ni:0.22%, Alt:
0.040%, Bt:0.0015%, surplus are Fe and inevitable impurity；Carbon equivalent Ceq=0.43%, weld crack sensitivity coefficient
Pcm=0.19%。
The production technology of the tough bainite steel plate of 690MPa grades of high strength and low costs of the present embodiment includes smelting, continuous casting, heats, rolls
System and heat treatment procedure, specific process step are as described below:
(1) smelting procedure: molten steel refines, depth deoxidation, desulfurization through electric furnace smelting into LF furnace, according to target requires adjustment molten steel
Ingredient carries out Fruit storage when liquid steel temperature is up to 1560 DEG C；
(2) continuous casting working procedure: continuous casting obtains the steel billet of thickness 350mm, Chemical Composition in Cast Billet composition and mass percentage are as follows: C:
0.07%, Si:0.20%, Mn:1.61%, Nb:0.050%, Ti:0.01%, Mo:0.30%, Ni:0.22%, Alt:0.040%, Bt:
0.0015%, surplus is Fe and inevitable impurity；
(3) heating process: billet heating temperature is 1240 DEG C；
(4) rolling process: two-stage control rolling mill practice is used；1110 DEG C of the start rolling temperature of rough rolling step, finishing temperature 1020
DEG C, dry in the air steel thickness 100mm；900 DEG C of the start rolling temperature in finish rolling stage, 810 DEG C of finishing temperature；Roll rear water cooling, cooling velocity 15
DEG C/s, 470 DEG C of final cooling temperature；
(5) heat treatment procedure: use tempering process, 560 DEG C of tempering temperature, tempering insulation time 5.0min/mm, after steel plate is come out of the stove
It is air-cooled to room temperature.
The mechanical property of the tough bainite steel plate of 690MPa grades of high strength and low costs of the present embodiment: yield strength 713MPa, tension
Intensity 789MPa, yield tensile ratio 0.90, elongation percentage A50: 16.3%, -40 DEG C of impact of collision function 123J.
The microscopic structure of the tough bainite steel plate of 690MPa grades of high strength and low costs of the present embodiment is shown in Fig. 1, and tissue is as seen from Figure 1
Tempering bainite.
Embodiment 2
The tough bainite steel plate of 690MPa grades of high strength and low costs of the present embodiment with a thickness of 20mm, chemical component composition and quality hundred
Divide content are as follows: C:0.03%, Si:0.30%, Mn:1.80%, Nb:0.070%, Ti:0.019%, Mo:0.10%, Ni:0.30%, Alt:
0.030%, Bt:0.0010%, surplus are Fe and inevitable impurity；Carbon equivalent Ceq=0.38%, weld crack sensitivity coefficient
Pcm=0.14%。
The production technology of the tough bainite steel plate of 690MPa grades of high strength and low costs of the present embodiment includes smelting, continuous casting, heats, rolls
System and heat treatment procedure, specific process step are as described below:
(1) smelting procedure: molten steel refines, depth deoxidation, desulfurization through electric furnace smelting into LF furnace, according to target requires adjustment molten steel
Ingredient carries out Fruit storage when liquid steel temperature is up to 1540 DEG C；
(2) continuous casting working procedure: continuous casting obtains the steel billet of thickness 260mm, Chemical Composition in Cast Billet composition and mass percentage are as follows: C:
0.03%, Si:0.30%, Mn:1.80%, Nb:0.070%, Ti:0.019%, Mo:0.10%, Ni:0.30%, Alt:0.030%, Bt:
0.0010%, surplus is Fe and inevitable impurity；
(3) heating process: billet heating temperature is 1220 DEG C；
(4) rolling process: two-stage control rolling mill practice is used；1099 DEG C of the start rolling temperature of rough rolling step, finishing temperature 1027
DEG C, dry in the air steel thickness 50mm；878 DEG C of the start rolling temperature in finish rolling stage, 783 DEG C of finishing temperature；Roll rear water cooling, cooling velocity 18
DEG C/s, 500 DEG C of final cooling temperature；
(5) heat treatment procedure: use tempering process, 600 DEG C of tempering temperature, tempering insulation time 3.5min/mm, after steel plate is come out of the stove
It is air-cooled to room temperature.
The mechanical property of the tough bainite steel plate of 690MPa grades of high strength and low costs of the present embodiment: yield strength 711MPa, tension
Intensity 793MPa, yield tensile ratio 0.90, elongation percentage A50: 16.8%, -40 DEG C of impact of collision function 132J.
The microscopic structure of the tough bainite steel plate of 690MPa grades of high strength and low costs of the present embodiment is shown in Fig. 2, and tissue is as seen from Figure 2
Tempering bainite.
Embodiment 3
The tough bainite steel plate of 690MPa grades of high strength and low costs of the present embodiment with a thickness of 5mm, chemical component composition and quality hundred
Divide content are as follows: C:0.09%, Si:0.10%, Mn:1.50%, Nb:0.030%, Ti:0.015%, Mo:0.40%, Ni:0.25%, Alt:
0.035%, Bt:0.0019%, surplus are Fe and inevitable impurity；Carbon equivalent Ceq=0.45%, weld crack sensitivity coefficient
Pcm=0.21%。
The production technology of the tough bainite steel plate of 690MPa grades of high strength and low costs of the present embodiment includes smelting, continuous casting, heats, rolls
System and heat treatment procedure, specific process step are as described below:
(1) smelting procedure: molten steel refines, depth deoxidation, desulfurization through electric furnace smelting into LF furnace, according to target requires adjustment molten steel
Ingredient carries out Fruit storage when liquid steel temperature is up to 1570 DEG C；
(2) continuous casting working procedure: continuous casting obtains the steel billet of thickness 200mm, Chemical Composition in Cast Billet composition and mass percentage are as follows: C:
0.09%, Si:0.10%, Mn:1.50%, Nb:0.030%, Ti:0.015%, Mo:0.40%, Ni:0.25%, Alt:0.035%, Bt:
0.0019%, surplus is Fe and inevitable impurity；
(3) heating process: billet heating temperature is 1200 DEG C；
(4) rolling process: two-stage control rolling mill practice is used；1070 DEG C of the start rolling temperature of rough rolling step, finishing temperature 1007
DEG C, dry in the air steel thickness 30mm；920 DEG C of the start rolling temperature in finish rolling stage, 819 DEG C of finishing temperature；Roll rear water cooling, cooling velocity 20
DEG C/s, 520 DEG C of final cooling temperature；
(5) heat treatment procedure: use tempering process, 610 DEG C of tempering temperature, tempering insulation time 4.0min/mm, after steel plate is come out of the stove
It is air-cooled to room temperature.
The mechanical property of the tough bainite steel plate of 690MPa grades of high strength and low costs of the present embodiment: yield strength 715MPa, tension
Intensity 779MPa, yield tensile ratio 0.92, elongation percentage A50: 16.1%, -40 DEG C of impact of collision function 121J.
The microscopic structure of the tough bainite steel plate of 690MPa grades of high strength and low costs of the present embodiment is shown in Fig. 3, and tissue is as seen from Figure 3
Tempering bainite.
Embodiment 4
The tough bainite steel plate of 690MPa grades of high strength and low costs of the present embodiment with a thickness of 10mm, chemical component composition and quality hundred
Divide content are as follows: C:0.03%, Si:0.10%, Mn:1.50%, Nb:0.030%, Ti:0.020%, Mo:0.10%, Ni:0.20%, Alt:
0.045%, Bt:0.0020%, surplus are Fe and inevitable impurity；Carbon equivalent Ceq=0.31%, weld crack sensitivity coefficient
Pcm=0.13%。
The production technology of the tough bainite steel plate of 690MPa grades of high strength and low costs of the present embodiment includes smelting, continuous casting, heats, rolls
System and heat treatment procedure, specific process step are as described below:
(1) smelting procedure: molten steel refines, depth deoxidation, desulfurization through electric furnace smelting into LF furnace, according to target requires adjustment molten steel
Ingredient carries out Fruit storage when liquid steel temperature is up to 1590 DEG C；
(2) continuous casting working procedure: continuous casting obtains the steel billet of thickness 230mm, Chemical Composition in Cast Billet composition and mass percentage are as follows: C:
0.03%, Si:0.10%, Mn:1.50%, Nb:0.030%, Ti:0.020%, Mo:0.10%, Ni:0.20%, Alt:0.045%, Bt:
0.0020%, surplus is Fe and inevitable impurity；
(3) heating process: billet heating temperature is 1180 DEG C；
(4) rolling process: two-stage control rolling mill practice is used；1100 DEG C of the start rolling temperature of rough rolling step, finishing temperature 1050
DEG C, dry in the air steel thickness 40mm；860 DEG C of the start rolling temperature in finish rolling stage, 770 DEG C of finishing temperature；Roll rear water cooling, cooling velocity 17
DEG C/s, 500 DEG C of final cooling temperature；
(5) heat treatment procedure: use tempering process, 600 DEG C of tempering temperature, tempering insulation time 4.5min/mm, after steel plate is come out of the stove
It is air-cooled to room temperature.
The mechanical property of the tough bainite steel plate of 690MPa grades of high strength and low costs of the present embodiment: yield strength 700MPa, tension
Intensity 785MPa, yield tensile ratio 0.89, elongation percentage A50: 17.2%, -40 DEG C of impact of collision function 141J.
The microscopic structure of the tough bainite steel plate of 690MPa grades of high strength and low costs of the present embodiment is shown in Fig. 4, and tissue is as seen from Figure 4
Tempering bainite.
Embodiment 5
The tough bainite steel plate of 690MPa grades of high strength and low costs of the present embodiment with a thickness of 30mm, chemical component composition and quality hundred
Divide content are as follows: C:0.05%, Si:0.30%, Mn:1.60%, Nb:0.070%, Ti:0.010%, Mo:0.40%, Ni:0.30%, Alt:
0.014%, Bt:0.0010%, surplus are Fe and inevitable impurity；Carbon equivalent Ceq=0.44%, weld crack sensitivity coefficient
Pcm=0.18%。
The production technology of the tough bainite steel plate of 690MPa grades of high strength and low costs of the present embodiment includes smelting, continuous casting, heats, rolls
System and heat treatment procedure, specific process step are as described below:
(1) smelting procedure: molten steel refines, depth deoxidation, desulfurization through electric furnace smelting into LF furnace, according to target requires adjustment molten steel
Ingredient carries out Fruit storage when liquid steel temperature is up to 1555 DEG C；
(2) continuous casting working procedure: continuous casting obtains the steel billet of thickness 300mm, Chemical Composition in Cast Billet composition and mass percentage are as follows: C:
0.05%, Si:0.30%, Mn:1.60%, Nb:0.070%, Ti:0.010%, Mo:0.40%, Ni:0.30%, Alt:0.014%, Bt:
0.0010%, surplus is Fe and inevitable impurity；
(3) heating process: billet heating temperature is 1270 DEG C；
(4) rolling process: two-stage control rolling mill practice is used；1120 DEG C of the start rolling temperature of rough rolling step, finishing temperature 1000
DEG C, dry in the air steel thickness 75mm；900 DEG C of the start rolling temperature in finish rolling stage, 820 DEG C of finishing temperature；Roll rear water cooling, cooling velocity 18
DEG C/s, 490 DEG C of final cooling temperature；
(5) heat treatment procedure: use tempering process, 620 DEG C of tempering temperature, tempering insulation time 3.5min/mm, after steel plate is come out of the stove
It is air-cooled to room temperature.
The mechanical property of the tough bainite steel plate of 690MPa grades of high strength and low costs of the present embodiment: yield strength 720MPa, tension
Intensity 783MPa, yield tensile ratio 0.92, elongation percentage A50: 16.5%, -40 DEG C of impact of collision function 135J.
The microscopic structure of the tough bainite steel plate of 690MPa grades of high strength and low costs of the present embodiment is shown in Fig. 5, and tissue is as seen from Figure 5
Tempering bainite.
The above embodiments are only used to illustrate and not limit the technical solutions of the present invention, although referring to above-described embodiment to this hair
It is bright to be described in detail, those skilled in the art should understand that: still the present invention can be modified or be waited
With replacement, without departing from the spirit or scope of the invention, or any substitutions, should all cover in power of the invention
In sharp claimed range.
Claims (10)
1. a kind of tough bainite steel plate of 690MPa grades of high strength and low cost, which is characterized in that steel plate chemical component composition and its
Mass percentage is C:0.03~0.09%, Si:0.10~0.30%, Mn:1.50~1.80%, Nb:0.030~0.070%, Ti
≤ 0.02%, Mo:0.10~0.40%, Ni:0.20~0.30%, Alt≤0.045%, Bt≤0.002%, surplus are Fe and can not keep away
The impurity exempted from.
2. the tough bainite steel plate of a kind of 690MPa grades of high strength and low costs according to claim 1, which is characterized in that the steel
Board group is woven to tempering bainite, and steel plate thickness is 5~40mm, carbon equivalent Ceq≤0.45%, and weld crack sensitivity coefficient Pcm≤
0.22%。
3. the tough bainite steel plate of a kind of 690MPa grades of high strength and low costs according to claim 1, which is characterized in that the steel
Plate yield strength >=700MPa, 770~900MPa of tensile strength, yield tensile ratio≤0.92, elongation percentage A50>=16%, -40 DEG C of longitudinal punchings
Hit function >=120J.
4. the production work based on the tough bainite steel plate of a kind of 690MPa grades of high strength and low cost described in claim 1-3 any one
Skill, which is characterized in that the production technology includes smelting, continuous casting, heating, rolling and heat treatment procedure；The rolling process, is adopted
With two-stage control rolling mill practice, finish rolling stage start rolling temperature is 860~920 DEG C, and finishing temperature is 770~820 DEG C；The heat
Treatment process, using tempering process, tempering temperature is 560~620 DEG C.
5. a kind of production technology of the tough bainite steel plate of 690MPa grades of high strength and low costs according to claim 4, feature
It is, the rolling process, using recrystallization and the controlled rolling of non-recrystallization two stages, rough rolling step temperature is 1000~1120 DEG C,
Dry in the air steel thickness >=2.5H, and the H is the thickness of finished steel plate.
6. a kind of production technology of the tough bainite steel plate of 690MPa grades of high strength and low costs according to claim 4, feature
It is, the rolling process, roll rear water cooling, cooling velocity control is controlled in 15~20 DEG C/s, final cooling temperature at 470~520 DEG C.
7. a kind of production work of the tough bainite steel plate of 690MPa grades of high strength and low cost according to claim 4-6 any one
Skill, which is characterized in that the heat treatment procedure, using tempering process, 3.5~5.0min/mm of tempering insulation time comes out of the stove air-cooled
To room temperature.
8. a kind of production work of the tough bainite steel plate of 690MPa grades of high strength and low cost according to claim 4-6 any one
Skill, which is characterized in that the smelting procedure, molten steel refine, depth deoxidation, desulfurization are according to target wanted through electric furnace smelting into LF furnace
It seeks adjustment molten steel composition, carries out Fruit storage when liquid steel temperature is up to 1540~1590 DEG C.
9. a kind of production work of the tough bainite steel plate of 690MPa grades of high strength and low cost according to claim 4-6 any one
Skill, which is characterized in that the continuous casting working procedure, continuous casting obtain the steel billet of 200~350mm of thickness, Chemical Composition in Cast Billet composition and its
Mass percentage is C:0.03~0.09%, Si:0.10~0.30%, Mn:1.50~1.80%, Nb:0.030~0.070%, Ti
≤ 0.02%, Mo:0.10~0.40%, Ni:0.20~0.30%, Alt≤0.045%, Bt≤0.002%, surplus are Fe and can not keep away
The impurity exempted from.
10. a kind of production of the tough bainite steel plate of 690MPa grades of high strength and low cost according to claim 4-6 any one
Technique, which is characterized in that the heating process, heating temperature are 1180~1270 DEG C.
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