CN106591716A - Automobile beam steel with high toughness and tensile strength of 750 MPa, and production method thereof - Google Patents
Automobile beam steel with high toughness and tensile strength of 750 MPa, and production method thereof Download PDFInfo
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- CN106591716A CN106591716A CN201611054364.3A CN201611054364A CN106591716A CN 106591716 A CN106591716 A CN 106591716A CN 201611054364 A CN201611054364 A CN 201611054364A CN 106591716 A CN106591716 A CN 106591716A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- 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
- 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
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- C—CHEMISTRY; METALLURGY
- 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
- C21D2211/005—Ferrite
-
- C—CHEMISTRY; METALLURGY
- 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
- C21D2211/009—Pearlite
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Abstract
The invention discloses an automobile beam steel with high toughness and a tensile strength of 750 MPa and a production method thereof, belonging to the technical field of metallurgy. The automobile beam steel comprises the following chemical components by weight: 0.06 to 0.09% of C, no more than 0.2% of Si, 1.6 to 2.0% of Mn, no more than 0.015% of P, no more than 0.006% of S, 0.015 to 0.060% of Als, 0.045 to 0.065% of Nb, 0.08 to 0.10% of Ti, 0.035 to 0.050% of V, 0.1 to 0.2% of Mo and no more than 0.005% of N, with the balance being Fe and unavoidable impurities. The production method comprises the following steps: smelting and continuous casting; slab heating; de-scaling with high-pressure water; controlled rolling; controlled-rolling cooling; and reeling. The automobile beam steel has high strength and allows the effect of weight reduction in frame design to reach 10 to 25%; the automobile beam steel has good formability and is applicable to processes like stamping, welding, rolling and folding; and the automobile beam steel has good low-temperature toughness and is adaptive to transportation in cold regions.
Description
Technical field
The invention belongs to metallurgical technology field, and in particular to high tenacity tensile strength 750MPa level steel for automobile crossbeam and life
Product method.
Background technology
Automotive frame is the critical piece of truck, almost carries the total weight of goods, and the quality of crossbeam affects
The service life and traffic safety of car load.At present, in automobile manufacture industry, automotive frame typically using punch forming and is welded into
Type technique, its mode of texturing based on clod wash, therefore, the formability of big beam slab is required higher, i.e., must have good synthesis
Performance, will have enough obdurabilities, good fatigue durability, cold formability.The use environment of the complexity of automotive frame, determines
Beam steel is one of higher steel grade of technology content, while and in automobile structural steel, demand is big, lucrative steel
Kind.
With the development of auto industry, it is to meet improve the bearing capacity of automobile, reduce rolled steel dosage, reduce producing into
Originally, extend automotive service life and energy-conservation, section material and safety traffic etc. required, automotive frame is produced with ultrahigh-strength steel plates,
Development trend is become.Downstream user is for the reason such as automotive service variation of ambient temperature is big, it is desirable to which automotive frame reduces component
Deadweight, low-temperature impact-resistant.Therefore, in following industry, will to high tenacity tensile strength 750MPa level steel for automobile crossbeam demand
Increase considerably.Exploitation high tenacity hot rolling steel for automobile crossbeam, has a extensive future.
The content of the invention
It is an object of the invention to provide a kind of high tenacity tensile strength 750MPa level steel for automobile crossbeam and its producer
Method, the hot rolling automotive frame steel produced by the present invention, tensile strength ＞ 750MPa, yield strength ＞ 700MPa, percentage elongation ＞
16%, -20 DEG C of low-temperature impact ＞ 30J, are organized as ferrite+pearlite, and ferrite accounts for 95%, and pearlite accounts for 5%, and grain size >=
11 grades.Intensity of the present invention is high, in Vehicle Frame Design weight loss effect up to 10%～25%；Good moldability, it is adaptable to punching press, welding, roller
The techniques such as pressure, bending；Low-temperature flexibility is good, it is adaptable to the transport of cold district.
To solve above-mentioned technical problem, the present invention is adopted the following technical scheme that：A kind of high tenacity tensile strength 750MPa level
Steel for automobile crossbeam, the steel for automobile crossbeam chemical composition and percentage by weight are：C：0.06～0.09%, Si≤0.2%,
Mn：1.6～2.0%, P≤0.015%, S≤0.006%, Als：0.015～0.060%, Nb：0.045～0.065%, Ti：0.08～
0.11%, V：0.035-0.050%, Mo：0.1～0.2%, N≤0.005%, balance of Fe and inevitable impurity.
Steel for automobile crossbeam tensile strength >=750MPa of the present invention, yield strength >=700MPa.
Steel for automobile crossbeam percentage elongation >=16% of the present invention, -20 DEG C of low-temperature impact >=30J.
The present invention also provides a kind of production method of above-mentioned high tenacity tensile strength 750MPa level steel for automobile crossbeam, described
Production method comprises the steps：Smelting continuous casting, heating of plate blank, high-pressure water descaling, controlled rolling, controlled rolling are cooled down, are batched；It is described
Controlled rolling operation, including roughing rolling, finish rolling rolling.
Controlled rolling operation of the present invention, five passes of roughing, 1050～1150 DEG C of middle base temperature, middle base are thick
Degree 38-55mm.
Controlled rolling operation of the present invention, finish rolling end reduction in pass >=12%, exit temperature at finishing is 850～920
℃。
Smelting continuous casting working procedure of the present invention, molten iron Jing molten iron pretreatment, converter smelting, LF refining, RH refines, slab connect
Into continuous casting billet, the continuous casting billet chemical composition and percentage by weight are cast：C：0.06～0.09%, Si≤0.2%, Mn：1.6～
2.0%, P≤0.015%, S≤0.006%, Als：0.015～0.060%, Nb：0.045～0.065%, Ti：0.08～0.11%, V：
0.035-0.050%, Mo：0.1～0.2%, N≤0.005%, balance of Fe and inevitable impurity.
Heating of plate blank operation of the present invention, slab are heated to 1200～1300 DEG C in heating furnace.
Control refrigerating work procedure of the present invention, is concentrated using leading portion and is cooled down, section cooling speed >=25 DEG C/S, coiling temperature
550～650 DEG C.
The each alloys producing of the detailed description of the invention and mechanism：
C：0.05～0.08%, carbon is interstitial solute atom in the material, and content increases, and high-order can decline, to ductile-brittle transition temperature
There is detrimental effect, relatively low carbon content can realize crystal grain refinement and precipitation strength with Ti, Nb, V-arrangement into strong carbide, can
Make the steel there is good weldability and cold formability, intensity can not be made up completely by microalloying and cooling controlling and rolling controlling process；
Mn：1.6～2.0%, manganese is good deoxidizer and desulfurizing agent.Typically all contain a certain amount of manganese in steel, it can eliminate or
Weaken due to the red brittleness of the steel caused by sulfur, so as to improve the hot-working character of steel.Manganese and ferrum form solid solution, improve steel
The hardness and intensity of middle ferrite and austenite；It is carbide former again simultaneously, replaces a part of ferrum in cementite
Atom.Manganese is in steel due to reducing critical transition temperature.Play a part of to refine pearlite.Also play indirectly raising pearlite
The effect of hardness of steel；The ability of manganese stable austenite tissue is only second to nickel, also strongly increases the quenching degree of steel.Based on this determination unit
The content of plain Mn.
Nb：The formation element of strong C, N compound of 0.045～0.065%, Nb, it significantly can postpone hot rolling before precipitation
During austenite recrystallization, and obviously Grain Refinement Effect, the crystal grain thinning of Nb and analysis can be produced in phase transformation
It is very significant to go out invigoration effect to the obdurability contribution for improving material.Additionally, Nb is reduced in being dissolved in solid solution austenite
Transition temperature, further strengthens Grain Refinement Effect, while the loss of strength that reduction C content is caused is made up, improves
The intensity of steel.
Ti：0.08～0.11%, Ti are in steel except combining to form Ti (CN) compound fining ferrite grains to reach with C, N
To outside tough purpose, Ti also with steel in 0, S have extremely strong affinity, the form of sulfide can be improved, steel is significantly improved
Toughness, improves welding heat affected zone performance and fatigue behaviour, while when welding to material, can obviously improve the property of heat affected area
Energy.
V：0.035-0.050%, in steel, V is stronger precipitation strength element.After V is added in steel, in steel, major part N and V is tied
Into V (CN), its dissolving, Precipitation Temperature are all high than VC for symphysis, and the V (CN) in the operation of rolling in steel can be separated out because of deformation inductdion,
On the one hand Austenite Grain Growth is prevented, on the other hand can be prevented or be promoted the generation of austenite recrystallization again, refine Ovshinsky
Crystal grain body is so as to fining ferrite grains.
Mo：0.1-0.2%, Main Function of the molybdenum in steel alloy be, it has stronger carbide Forming ability, make compared with
The steel alloy of low carbon content also has higher hardness.And molybdenum can prevent the coarse grains of austenitizing.Also it is exactly molybdenum
Moving to right for C curve can be caused, its result is exactly to reduce degree of supercooling, greatly improves quenching degree.
Al：0.010～0.060%, Al are the deoxidizers commonly used in steel.A small amount of aluminum is added in steel, can crystal grain thinning, carry
High impact toughness.Al also has non-oxidizability and corrosion resistance, and aluminum silicon is shared, and is remarkably improved the high temperature non-scale performance of steel
With the ability of high-temperature corrosion resistance.But hot-working character, welding performance and the machinability of steel will be affected when Al exceedes a certain amount of
Energy.
P≤0.015%, phosphorus are a kind of easy segregation element in steel, especially work as P>When 0.015%, the segregation of phosphorus drastically increases
Plus, meanwhile, phosphorus also deteriorates welding performance, significantly reduces the low-temperature impact toughness of steel, improves the brittle transition temperature of steel, sends out steel
Raw food is crisp.For the phosphorus content that strictly should be controlled in steel.To ensure good toughness and welding performance, P must typically control to exist
Less than 0.015%.
S≤0.006%, sulfur are one of the most harmful elements in steel, with the increase of sulfur content in steel, crack-sensitivity rate
Dramatically increase.Sulfur has an effect on the impact flexibility of steel, and sulfur content is raised, and notched bar impact strength drastically declines.In addition, sulfur to also result in steel each
Anisotropy, on laterally and thickness direction, toughness deteriorates.In the production of this steel grade, the content of S is generally not more than 0.006%.
N≤0.005%, nitrogen are gap solid solution elements, are easily combined with titanium elements, generation titanium nitride, titanium nitride particles compared with
Greatly, the toughness of severe exacerbation steel.
In the production method of the present invention, Jing molten iron pretreatment, converter smelting, LF refining, RH refines, sheet billet continuous casting are produced
Strand, the control of heating-up temperature and heat time heating time is one of crucial production process, it is desirable to the tapping temperature of slab 1200～
In the range of 1300 DEG C, it is therefore an objective to the alloying element in slab is guaranteed can fully solid solution, while avoiding what excessive grain was grown up
Under the conditions of, slab heating temperature is improved, reduces rolling rolling load, reduce rolling difficulty.
Controlled rolling includes roughing, two procedure of finish rolling, and roughing adopts five passes, middle base temperature after the completion of roughing
In the range of 1040～1090 DEG C, middle base 38-55mm.Before finish rolling, between two rolling mill frames, de-scaling water comes into operation, and guarantees de-scaling
Pressure is more than 10MPa, finish rolling end percentage pass reduction ＞ 12%, it is ensured that the accumulative deformation ＞ 60% in non-recrystallization region, finish rolling outlet temperature
Degree is in the range of 850～920 DEG C.
It is phase transformation strengthening and precipitation strength stage to roll rear section cooling and batch, and strip steel generates the Main Stage of intensity,
Therefore it is highly important production link, it is desirable to control rate of cooling >=25 DEG C/S, realize that leading portion is quickly cooled down, coiling temperature is
550～650 DEG C.
The high tenacity tensile strength 750MPa level steel for automobile crossbeam produced by the present invention, ferrite content account for 95%, pearl
Body of light accounts for 5%.
Using the beneficial effect produced by above-mentioned technical proposal it is：The high tenacity tensile strength produced by the present invention
750MPa level steel for automobile crossbeam, tensile strength >=750MPa, yield strength >=700MPa, percentage elongation >=16%, -20 DEG C of low temperature
Impact >=30J, is organized as ferrite+pearlite, and ferrite accounts for 95%, and pearlite accounts for 5%, grain size >=11 grade.Vapour of the present invention
Crossbeam is high with hardness of steel, in Vehicle Frame Design weight loss effect up to 10%～25%；Good moldability, it is adaptable to punching press, welding, roller
The techniques such as pressure, bending；Low-temperature flexibility is good, it is adaptable to the transport of cold district.
Description of the drawings
Fig. 1 is 750MPa level steel for automobile crossbeam microstructure figures in embodiment 1；
Fig. 2 is 750MPa level steel for automobile crossbeam microstructure figures in embodiment 2；
Fig. 3 is 750MPa level steel for automobile crossbeam microstructure figures in embodiment 3；
Fig. 4 is 750MPa level steel for automobile crossbeam microstructure figures in embodiment 4；
Fig. 5 is 750MPa level steel for automobile crossbeam microstructure figures in embodiment 5.
Specific embodiment
A kind of preparation method of high tenacity tensile strength 750MPa level steel for automobile crossbeam, comprises the steps：
1）Jing molten iron pretreatment → converter smelting → LF refining → RH refines → sheet billet continuous casting forms continuous casting billet；
2）In heating furnace, by heating of plate blank to 1200～1300 DEG C；
3）Five passes of Jing roughing, finish rolling rolling；Wherein in the middle of roughing, base temperature is 1050～1150 DEG C, workpiece thickness
38-55mm；Finish rolling is rolled using 7 rolling mills, finish rolling end reduction in pass >=12%, it is ensured that and the accumulative deformation in non-recrystallization region >=
60%；Exit temperature at finishing is 860～920 DEG C；
4）Control cooling, is concentrated using leading portion and is cooled down, section cooling speed >=25 DEG C/S, 550～650 DEG C of coiling temperature.
Below in conjunction with the accompanying drawings and specific embodiment the present invention is further detailed explanation.
Embodiment 1
High tenacity tensile strength 750MPa level steel for automobile crossbeam, finished product thickness is 8mm, chemical composition each component percentage by weight
Content is：C：0.06%, Si：0.12%, Mn：1.84%, P：0.008%, S：0.005%, Als：0.026%, Nb：0.053%, Ti：
0.106%, V：0.053%, Mo：0.12%, N：0.0045 %, balance of Fe and inevitable impurity.It is organized as ferrite+pearly-lustre
Body, ferrite account for 95%, and pearlite accounts for 5%, 11 grades of grain size.
Production technology comprises the steps：
1）Jing molten iron pretreatment, converter smelting, LF refining, RH refines, sheet billet continuous casting form continuous casting billet；
2）In heating furnace, by heating of plate blank to 1245 DEG C；
3）Five passes of Jing roughing, finish rolling rolling；1070 DEG C of base temperature wherein in the middle of roughing, workpiece thickness 55mm；Finish rolling
Rolled using 7 rolling mills, finish rolling end reduction in pass 12.1%, finished product thickness 8mm, exit temperature at finishing are 870 DEG C；
4）Control cooling, is concentrated using leading portion and is cooled down, 30 DEG C/S of section cooling speed, 570 DEG C of coiling temperature.
Embodiment 2
High tenacity tensile strength 750MPa level steel for automobile crossbeam, finished product thickness is 10mm, chemical composition each component weight percent
Than content it is：C：0.06%, Si：0.13%, Mn：1.81%, P：0.012%, S：0.004%, Als：0.031%, Nb：0.055%, Ti：
0.097%, V：0.041%, Mo：0.12%, N：0.0043%, balance of Fe and inevitable impurity.It is organized as ferrite+pearly-lustre
Body, ferrite account for 95 %, and pearlite accounts for 5 %, 12 grades of grain size.
Production technology comprises the steps：
1）Jing molten iron pretreatment, converter smelting, LF refining, RH refines, sheet billet continuous casting form continuous casting billet；
2）In heating furnace, by heating of plate blank to 1250 DEG C；
3）Five passes of Jing roughing, finish rolling rolling；1060 DEG C of base temperature wherein in the middle of roughing, workpiece thickness 55mm；Finish rolling
Rolled using 7 rolling mills, finish rolling end reduction in pass 12.2%, finished product thickness 10mm, exit temperature at finishing are 868 DEG C；
4）Control cooling, is concentrated using leading portion and is cooled down, 28 DEG C/S of section cooling speed, 570 DEG C of coiling temperature.
Embodiment 3
High tenacity tensile strength 750MPa level steel for automobile crossbeam, finished product thickness is 6mm, chemical composition each component percentage by weight
Content is：C：0.06%, Si：0.15%, Mn：1.75%, P：0.012%, S：0.004%, Als：0.042%, Nb：0.054%, Ti：
0.102%, V：0.041%, Mo：0.13%, N：0.0050%, balance of Fe and inevitable impurity.It is organized as ferrite+pearly-lustre
Body, ferrite account for 95%, and pearlite accounts for 5%, 11 grades of grain size.
Production technology comprises the steps：
1）Jing molten iron pretreatment, converter smelting, LF refining, RH refines, sheet billet continuous casting form continuous casting billet；
2）In heating furnace, by heating of plate blank to 1250 DEG C；
3）Five passes of Jing roughing, finish rolling rolling；1065 DEG C of base temperature wherein in the middle of roughing, workpiece thickness 50mm；Finish rolling
Rolled using 7 rolling mills, finish rolling end reduction in pass 12.0%, finished product thickness 6mm, exit temperature at finishing are 869 DEG C；
4）Control cooling, is concentrated using leading portion and is cooled down, 28 DEG C/S of section cooling speed, 607 DEG C of coiling temperature.
Embodiment 4
High tenacity tensile strength 750MPa level steel for automobile crossbeam, finished product thickness is 10mm, chemical composition each component weight percent
Than content it is：C：0.09%, Si：0.2%, Mn：1.6%, P：0.015%, S：0.002%, Als：0.060%, Nb：0.045%, Ti：
0.08%, V：0.035%, Mo：0.2%, N：0.005%, balance of Fe and inevitable impurity.It is organized as ferrite+pearlite, ferrum
Ferritic accounts for 95 %, and pearlite accounts for 5%, 12 grades of grain size.
Production technology comprises the steps：
1）Jing molten iron pretreatment, converter smelting, LF refining, RH refines, sheet billet continuous casting form continuous casting billet；
2）In heating furnace, by heating of plate blank to 1200 DEG C；
3）Five passes of Jing roughing, finish rolling rolling；1050 DEG C of base temperature wherein in the middle of roughing, workpiece thickness 40mm；Finish rolling
Rolled using 7 rolling mills, finish rolling end reduction in pass 12.0%, finished product thickness 10mm, exit temperature at finishing are 850 DEG C；
4）Control cooling, is concentrated using leading portion and is cooled down, 26.5 DEG C/S of section cooling speed, 550 DEG C of coiling temperature.
Embodiment 5
High tenacity tensile strength 750MPa level steel for automobile crossbeam, finished product thickness is 6mm, chemical composition each component percentage by weight
Content is：C：0.09%, Si：0.15%, Mn：2.0%, P：0.005%, S：0.006%, Als：0.015%, Nb：0.065%, Ti：
0.11%, V：0.050%, Mo：0.1%, N：0.002%, balance of Fe and inevitable impurity.It is organized as ferrite+pearlite, ferrum
Ferritic accounts for 95 %, and pearlite accounts for 5%, 11 grades of grain size.
Production technology comprises the steps：
1）Jing molten iron pretreatment, converter smelting, LF refining, RH refines, sheet billet continuous casting form continuous casting billet；
2）In heating furnace, by heating of plate blank to 1300 DEG C；
3）Five passes of Jing roughing, finish rolling rolling；1150 DEG C of base temperature wherein in the middle of roughing, workpiece thickness 38mm；Finish rolling
Rolled using 7 rolling mills, finish rolling end reduction in pass 13.0%, finished product thickness 6mm, exit temperature at finishing are 920 DEG C；
4）Control cooling, is concentrated using leading portion and is cooled down, 20 DEG C/S of section cooling speed, 650 DEG C of coiling temperature.
1 example of table, 1～5 corresponding hot-rolled coil mechanical property
1 embodiment 1-5 product mechanical property table of table
Shown in table 1, the high tenacity tensile strength 750MPa level steel for automobile crossbeam produced by example 1～5, yield strength >=
700MPa, tensile strength >=750MPa, percentage elongation >=16%, AKV（-20℃）>=30J, with good mechanical strength, plasticity and
Toughness is matched.
Above example is only to illustrative and not limiting technical scheme, although reference above-described embodiment is to this
It is bright to be described in detail, it will be understood by those within the art that：Still the present invention can be modified or be waited
With replacing, any modification or partial replacement without departing from the spirit and scope of the present invention, which all should cover the power in the present invention
In the middle of sharp claimed range.
Claims (9)
1. a kind of high tenacity tensile strength 750MPa level steel for automobile crossbeam, it is characterised in that the steel for automobile crossbeam chemistry
Composition and percentage by weight are：C：0.06～0.09%, Si≤0.2%, Mn：1.6～2.0%, P≤0.015%, S≤0.006%,
Als：0.015～0.060%, Nb：0.045～0.065%, Ti：0.08～0.11%, V：0.035-0.050%, Mo：0.1～
0.2%, N≤0.005%, balance of Fe and inevitable impurity.
2. high tenacity tensile strength 750MPa level steel for automobile crossbeam according to claim 1, it is characterised in that the vapour
Crossbeam steel tensile strength >=750MPa, yield strength >=700MPa.
3. high tenacity tensile strength 750MPa level steel for automobile crossbeam according to claim 1, it is characterised in that the vapour
Crossbeam steel percentage elongation >=16%, -20 DEG C of low-temperature impact >=30J.
4. the producer based on the high tenacity tensile strength 750MPa level steel for automobile crossbeam described in claim 1-3 any one
Method, it is characterised in that the production method comprises the steps：Smelt continuous casting, heating of plate blank, high-pressure water descaling, controlled rolling,
Controlled rolling is cooled down, is batched；The controlled rolling operation, including roughing rolling, finish rolling rolling.
5. production method according to claim 4, it is characterised in that the controlled rolling operation, five passes of roughing,
1050～1150 DEG C of middle base temperature, workpiece thickness 38-55mm.
6. production method according to claim 4, it is characterised in that the controlled rolling operation, finish rolling extreme trace time pressure
Amount >=12%, exit temperature at finishing are 850～920 DEG C.
7. the production method according to claim 4-6 any one, it is characterised in that the smelting continuous casting working procedure, molten iron
Jing molten iron pretreatment, converter smelting, LF refining, RH refines, sheet billet continuous casting form continuous casting billet, the continuous casting billet chemical composition and weight
Measuring percentage ratio is：C：0.06～0.09%, Si≤0.2%, Mn：1.6～2.0%, P≤0.015%, S≤0.006%, Als：0.015
～0.060%, Nb：0.045～0.065%, Ti：0.08～0.11%, V：0.035-0.050%, Mo：0.1～0.2%, N≤
0.005%, balance of Fe and inevitable impurity.
8. the production method according to claim 4-6 any one, it is characterised in that the heating of plate blank operation, slab
1200～1300 DEG C are heated in heating furnace.
9. the production method according to claim 4-6 any one, it is characterised in that the control refrigerating work procedure, adopts
Leading portion concentrates cooling, section cooling speed >=25 DEG C/S, 550～650 DEG C of coiling temperature.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611054364.3A CN106591716A (en) | 2016-11-25 | 2016-11-25 | Automobile beam steel with high toughness and tensile strength of 750 MPa, and production method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611054364.3A CN106591716A (en) | 2016-11-25 | 2016-11-25 | Automobile beam steel with high toughness and tensile strength of 750 MPa, and production method thereof |
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| CN106591716A true CN106591716A (en) | 2017-04-26 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108486476A (en) * | 2018-05-25 | 2018-09-04 | 河钢股份有限公司承德分公司 | 700Mpa hot rollings containing vanadium checkered steel plate and its production method |
| CN109536846A (en) * | 2017-09-21 | 2019-03-29 | 上海梅山钢铁股份有限公司 | Yield strength 700MPa grade high ductility hot rolled steel plate and its manufacturing method |
| CN109576569A (en) * | 2018-07-20 | 2019-04-05 | 首钢集团有限公司 | A kind of torsion beam of automobile steel and preparation method thereof |
| CN110257612A (en) * | 2019-06-17 | 2019-09-20 | 首钢集团有限公司 | A kind of preparation method of low residual stress low alloy high strength steel plate |
| CN111647805A (en) * | 2020-05-12 | 2020-09-11 | 首钢集团有限公司 | Axle housing steel with yield strength of 600MPa after hot forming, preparation method thereof and axle housing |
| CN112517638A (en) * | 2020-10-20 | 2021-03-19 | 江苏省沙钢钢铁研究院有限公司 | Control method of hot-rolled high-strength steel strip-shaped structure for cold roll forming |
| CN113025913A (en) * | 2021-02-07 | 2021-06-25 | 首钢集团有限公司 | 700MPa steel based on multi-mode sheet billet continuous casting and rolling production line and production method thereof |
| CN115572903A (en) * | 2022-10-14 | 2023-01-06 | 山东钢铁集团日照有限公司 | Low-cost, low-temperature-impact and high-toughness steel for automobile structures and production method thereof |
| CN116145042A (en) * | 2022-12-29 | 2023-05-23 | 邯郸钢铁集团有限责任公司 | Cold-formed high-strength steel S700MC with good rolling performance and production method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008280608A (en) * | 2007-04-13 | 2008-11-20 | Jfe Steel Kk | High-strength hot-dip galvanized steel sheet excellent in workability and weldability, and its manufacturing method |
| CN102363858A (en) * | 2011-11-03 | 2012-02-29 | 首钢总公司 | High-strength steel for 750 to 880 MPa-level vehicles and production method thereof |
-
2016
- 2016-11-25 CN CN201611054364.3A patent/CN106591716A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008280608A (en) * | 2007-04-13 | 2008-11-20 | Jfe Steel Kk | High-strength hot-dip galvanized steel sheet excellent in workability and weldability, and its manufacturing method |
| CN102363858A (en) * | 2011-11-03 | 2012-02-29 | 首钢总公司 | High-strength steel for 750 to 880 MPa-level vehicles and production method thereof |
Cited By (12)
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| CN109536846A (en) * | 2017-09-21 | 2019-03-29 | 上海梅山钢铁股份有限公司 | Yield strength 700MPa grade high ductility hot rolled steel plate and its manufacturing method |
| CN109536846B (en) * | 2017-09-21 | 2020-12-08 | 上海梅山钢铁股份有限公司 | High-toughness hot-rolled steel plate with yield strength of 700MPa and manufacturing method thereof |
| CN108486476A (en) * | 2018-05-25 | 2018-09-04 | 河钢股份有限公司承德分公司 | 700Mpa hot rollings containing vanadium checkered steel plate and its production method |
| CN109576569A (en) * | 2018-07-20 | 2019-04-05 | 首钢集团有限公司 | A kind of torsion beam of automobile steel and preparation method thereof |
| CN109576569B (en) * | 2018-07-20 | 2021-05-25 | 首钢集团有限公司 | Steel for automobile torsion beam and preparation method thereof |
| CN110257612A (en) * | 2019-06-17 | 2019-09-20 | 首钢集团有限公司 | A kind of preparation method of low residual stress low alloy high strength steel plate |
| CN111647805A (en) * | 2020-05-12 | 2020-09-11 | 首钢集团有限公司 | Axle housing steel with yield strength of 600MPa after hot forming, preparation method thereof and axle housing |
| CN111647805B (en) * | 2020-05-12 | 2021-12-21 | 首钢集团有限公司 | Axle housing steel with yield strength of 600MPa after hot forming, preparation method thereof and axle housing |
| CN112517638A (en) * | 2020-10-20 | 2021-03-19 | 江苏省沙钢钢铁研究院有限公司 | Control method of hot-rolled high-strength steel strip-shaped structure for cold roll forming |
| CN113025913A (en) * | 2021-02-07 | 2021-06-25 | 首钢集团有限公司 | 700MPa steel based on multi-mode sheet billet continuous casting and rolling production line and production method thereof |
| CN115572903A (en) * | 2022-10-14 | 2023-01-06 | 山东钢铁集团日照有限公司 | Low-cost, low-temperature-impact and high-toughness steel for automobile structures and production method thereof |
| CN116145042A (en) * | 2022-12-29 | 2023-05-23 | 邯郸钢铁集团有限责任公司 | Cold-formed high-strength steel S700MC with good rolling performance and production method thereof |
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