CN104404384B - A kind of 550MPa level low compression ratio high tenacity ocean engineering Platform Steel plate and production method - Google Patents
A kind of 550MPa level low compression ratio high tenacity ocean engineering Platform Steel plate and production method Download PDFInfo
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- CN104404384B CN104404384B CN201410791885.1A CN201410791885A CN104404384B CN 104404384 B CN104404384 B CN 104404384B CN 201410791885 A CN201410791885 A CN 201410791885A CN 104404384 B CN104404384 B CN 104404384B
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Abstract
The invention belongs to the technical field of ferrous materials, relate to a kind of 550MPa level low compression ratio high-tenacity steel plate for ocean engineering and production method, under the conditions of low carbon content and low compression ratio, particularly realize high intensity and the steel plate for ocean engineering of high tenacity and production method.Its chemical component weight percentage ratio is, C:0.04 0.10%, Si:0.2 0.4%, Mn:1.0 1.5%, P < 0.010%, S < 0.003%, Ni:0.5 0.8%, Cu:0.2 0.5%, Cr:0.30 0.80%, Mo:0.1 0.3%, Nb:0.02 0.05%, Ti:0.010 0.025%, surplus Fe and inevitable impurity, this alloy C content is low, it is easy to welding.Under the conditions of slab thickness is only 250mm, by strictly controlling C, P, S content, use to reduce and reheat temperature, optimize TMCP technique, reduce rolling temperature, reasonable distribution roughing and finish rolling stage drafts, optimize cooling technique and tempering heat treatment temperature, and steel can be made to realize high intensity and high/low temperature toughness under the conditions of low compression ratio (minimum only 3.125:1).
Description
Technical field
The invention belongs to the technical field of ferrous materials, relate to a kind of 550MPa level low compression ratio high tenacity ocean engineering and use
Steel plate and production method, the ocean engineering particularly realizing high intensity and high tenacity under the conditions of low carbon content and low compression ratio is used
Steel plate and production method.
Background technology
Maritime rights and interests are one of key benefits of China, and national marine implementation makes ocean engineering become in recent years
Build and the emphasis of exploitation, and gradually develop from coastal waters to deep-sea.The fast development of marine engineering equipment industry is to ocean engineering
Huge demand will be produced, particularly large-scale along with boats and ships, ocean engineering, harbour machinery, submarine transport oil pipeline etc. with steel
Change, high parameter and lightweight, propose the highest requirement to the performance of steel.In recent years, at Marine Engineering Steel
Research and development aspect, the Di Lingen etc. of the Nippon Steel of Japan and JFE, Germany is positioned at world steel enterprise prostatitis, and domestic iron and steel enterprises is also
In succession carry out corresponding R&D work, made a lot of progress, but the Marine Engineering Steel of domestic production at present is the most main
If applying in offshore engineering, based on yield strength 355 MPa level below steel, and abroad have begun to use 500
High-strength tenacity sea work steel more than MPa level；It is relatively big that Marine Engineering Steel is typically due to thickness specification, so adding higher alloy
Composition, and in order to reduce cost, C element addition often higher than 0.1%(all elements percentage ratio herein is weight hundred
Proportion by subtraction), although so ensure that intensity, but it is detrimental to the raising of low-temperature flexibility and welding performance.
From supply of material state, the production technology of sea work steel includes normalizing, controlled rolling and controlled cooling (TMCP) and quenched.Wherein due to
The method of normalizing generally obtains ferrite and adds pearlitic structrure, and intensity is difficult to improve, mainly for the production of 420MPa level below
Extra large work product made from steel；And the method for controlled rolling and controlled cooling can obtain high intensity, but owing to sea work steel thickness is relatively big, it is difficult to realization and rolls
The heavy reduction in stage processed, particularly heart portion are all difficult to protect at structure refinement and the ausforming in finish rolling stage of rough rolling step
Card, toughness to be ensured is accomplished by bigger compression ratio；And can carry well by quenched production method
Toughness is ensured while rising intensity, but relative to the production method of controlled rolling and controlled cooling, when producing the steel of same intensity rank,
Hardening and tempering process needs to add more alloying element with proof strength, does not the most only result in cost, and is unfavorable for welding,
The most quenched Technology for Heating Processing cost is the most of a relatively high.
Summary of the invention
The present invention is directed to the current demand of current Marine Engineering Steel application, according to production equipment and process condition,
Proposing a kind of low production cost, easily weld, the 550 MPa level 30-80 mm that can realize high tenacity under the conditions of low compression ratio are thick
Sea work steel and production method thereof, it is intended to the production for domestic Marine Engineering Steel provides more practicable production technology roads
Line.
The present invention realizes the scheme of above technology requirement:
A kind of 550MPa level low compression ratio high-tenacity steel plate for ocean engineering, the chemical component weight percentage ratio of described steel plate
Content is: C:0.04-0.10%, Si:0.2-0.4%, Mn:1.0-1.5%, P < 0.010%, S < 0.003%, Ni:0.5-0.8%, Cu:
0.2-0.5%, Cr:0.30-0.80%, Mo:0.1-0.3%, Nb:0.02-0.05%, Ti:0.010-0.025%, surplus Fe and
Inevitable impurity.
As preferably, control C content 0.06-0.07%.
As preferably, described steel plate is 30-80 mm thickness 550MPa level low compression ratio high-tenacity steel plate for ocean engineering；
More preferably 80mm is thick.
The compression ratio of 80mm steel plate is 3.125:1.
Another object of the present invention is:
The production method of a kind of 550MPa level low compression ratio high-tenacity steel plate for ocean engineering, specifically comprises the following steps that
Smelting process: desulfurizing iron≤0.003%；Strand P≤0.010%, RH degassing terminates rear soft blow and is not less than 20 minutes,
Calcium treatment is carried out after application of vacuum, bag target temperature 1535-1545 DEG C in continuous casting, add 15-25 DEG C for liquidus temperature, pulling rate is steady
Fixed；Strand examination requirements: center segregation C class≤1.5, center porosity≤0.5, [N]≤30ppm, [O]≤25ppm, [H]≤
1.5ppm, becomes 250mm heavy slab by molten steel casting, and roll off the production line stacking slow cooling；
Rolling mill practice: use two benches TMCP rolling；Roll front continuous casting billet reheating temperature and be 1150-1200 DEG C, roughing temperature
Degree is for 970-1040 DEG C, and finish rolling start rolling temperature 760 DEG C-820 DEG C, the ratio of roughing and finish rolling total reduction is about 2:1；Roll rear laminar flow
Cooling, rate of cooling is 3-8 DEG C/s, subsequently air cooling, and final cooling temperature is 200-400 DEG C；
Technology for Heating Processing: using high tempering, temperature interval is 550-700 DEG C, and temperature retention time is 1-3 min/mm,
Final tissue signature is bainite structure.
In described rolling mill practice: use TMCP rolling mill practice, reheat temperature range and be 1150-1200 DEG C, the most permissible
Ensure that austenite crystal is grown up not too much, can ensure that again the abundant solid solution of alloying element, the abundant dissolving of particularly Nb element.
In rolling mill practice, roughing temperature range 970-1040 DEG C, point 3-6 passes, overall reduction about 60%, middle
Base thickness 100-140 mm.
In rolling mill practice, 760-820 DEG C of finish rolling start rolling temperature interval, 4-6 passes, overall reduction about 30%.Use
Pattern of going around accelerates cooling, steel plate final cooling temperature 200-400 DEG C, and red temperature is less than 500 DEG C.
It is preferably 48h in the described smelting process strand slow cooling time.
The invention have the benefit that
The invention provides a kind of application TMCP+ tempering process produce 30-80 mm thickness 550MPa level Marine Engineering Steel and
Production method.Mainly by controlling C content 0.04-0.10%, it is preferably and controls C content 0.06-0.07%, ensureing weldability
Simultaneously, it is ensured that intensity reaches standard.P content is less than 0.010%, and S content is less than 0.003%.Although relatively low (the 80mm thickness steel of compression ratio
The compression ratio of plate is only 3.125:1), only just reach the minimum requirements of foot European standard EN10225, but utilize and reduce heating-up temperature
With the method reducing rolling temperature, it is achieved that austenite crystal recrystallization softening, it is ensured that low temperature impact properties.It is tempered not only after rolling
Eliminate quenching internal stress, and make the bulk carbide in steel decompose, improve toughness and structural homogenity further.Use this
The 550MPa level 30-80 mm thickness sea work steel that the method for kind produces, intensity can reach yield strength 620MPa, tensile strength
More than 705MPa, Charpy-V impact power can reach 230J at-40 DEG C, all at more than 120J when-60 DEG C.
In a word, steel plate alloy and the C content of the present invention are low, it is easy to welding.Under the conditions of slab thickness is only 250mm, logical
Crossing and strictly control C, P, S content, use and reduce reheating temperature, optimize TMCP technique, reduce rolling temperature, reasonable distribution is coarse-fine
Roll stage drafts, optimize cooling technique and tempering heat treatment temperature, can make steel low compression ratio (minimum be only 3.125:
1) high intensity and high/low temperature toughness are realized under the conditions of.
Accompanying drawing explanation
Fig. 1 is example 1 80mm thickness 550MPa level steel plate core structure pattern (granular bainite+ferrite bainite).
Detailed description of the invention
Below by specific embodiment, technical scheme is described in detail.
Low compression ratio high-tenacity steel plate for ocean engineering of the present invention, in smelting process, desulfurizing iron≤0.003%；
Strand P≤0.010%, RH degassing terminates rear soft blow and is not less than 20 minutes, carries out Calcium treatment, bag target in continuous casting after application of vacuum
Temperature 1540 DEG C, adds 15-25 DEG C for liquidus temperature, and pulling rate is stable；Strand assay require center segregation C class≤1.5, in
The heart loosens≤0.5, [N]≤30ppm, [O]≤25ppm, [H]≤1.5ppm, and molten steel casting becomes 250mm heavy slab, and roll off the production line heap
Buttress slow cooling 48 hours.
According to the production technology of the present invention, the actual chemical composition of steel grade smelting the rolling present invention is as shown in table 1:
The chemical composition (wt%) of table 1 embodiment of the present invention
The production method of a kind of low compression ratio high-tenacity steel plate for ocean engineering of the present invention, including following operation;
KR desulfurizing iron pretreatment → converter smelting → deoxidation alloying → CAS refine → LF refine → RH process → CCM continuous casting → casting
Base slow cooling 48h → slab reheating → high-pressure water descaling → controlled rolling → pre-straightening → press quenching → ball blast → tempering → rectify
Directly → cut, sample → check → number of spray prints → warehouse-in.
Smelting and use top and bottom combined blown converter smelting, the strict molten iron P content that controls, employing high-quality steel scrap, LF refine uses white
Slag operation, ladle chemistry adds at LF refine middle and late stage according to desired value control, ferrotianium.Pure degassing time >=6 of RH refine
Minute.Casting blank specification 250mm × 2200mm, steel billet is cold to be sent.
Rolling mill practice of the present invention is as follows, uses cooling controlling and rolling controlling process, rolls front continuous blank heating temperature 1180 DEG C, uses Ovshinsky
Body recrystallization zone and the rolling of austenite non-recrystallization zone two-stage control.Wherein example 1 steel plate thickness is 80mm, example 2 thickness
For 60mm, example 3 thickness is 30mm, example 1 workpiece thickness 140mm, and example 2 workpiece thickness is 110mm, in the middle of example 3
Base thickness is 100mm, and concrete rolling technological parameter is shown in Table 2.
The rolling technological parameter of table 2 present example
Technology for Heating Processing: temperature 650 DEG C, temperature retention time 2min/mm.
The performance such as table 3 obtained according to the technique of the present invention, example 1 steel plate heart portion is finally organized as bainite structure, gold
Phase constitution pattern is shown in Fig. 1.As seen from the figure, steel plate fine microstructures is uniform, and soft or hard phase constitution is reasonably distributed.The tensile strength of material is
707-716MPa, yield strength is 605-620MPa, and elongation after fracture is 20.5-22.0%, and Charpy-V impact power (laterally) is-40
DEG C >=150J ,-60 DEG C of low-temperature impact >=120J.There is stable processing technique, the feature such as workable.
The sheet material mechanical property obtained after table 3 embodiment of the present invention Tempering and Quenching
。
Claims (5)
1. a 550MPa level low compression ratio high-tenacity steel plate for ocean engineering, the chemical component weight percentage ratio of described steel plate contains
Amount is: C:0.04-0.10%, Si:0.2-0.4%, Mn:1.0-1.5%, P < 0.010%, S < 0.003%, Ni:0.5-0.8%, Cu:
0.2-0.5%, Cr:0.30-0.80%, Mo:0.1-0.3%, Nb:0.02-0.05%, Ti:0.010-0.025%, surplus Fe and not
Impurity can be avoided;Described steel plate maximum gauge is 80mm；The compression ratio of 80mm steel plate is 3.125:1；Described 550MPa
The production method of level low compression ratio high-tenacity steel plate for ocean engineering, specifically comprises the following steps that
(1) smelting process: desulfurizing iron≤0.003%；Strand P≤0.010%, RH degassing terminates rear soft blow and is not less than 20 minutes,
Calcium treatment is carried out after application of vacuum, bag target temperature 1535-1545 DEG C in continuous casting, add 15-25 DEG C for liquidus temperature, pulling rate is steady
Fixed；Strand examination requirements: center segregation C class≤1.5, center porosity≤0.5, [N]≤30ppm, [O]≤25ppm, [H]≤
1.5ppm, becomes 250mm heavy slab by molten steel casting, and roll off the production line stacking slow cooling；
(2) rolling mill practice: use two benches TMCP rolling；Roll front continuous casting billet reheating temperature and be 1150-1200 DEG C, roughing temperature
For 970-1040 DEG C, finish rolling start rolling temperature 760 DEG C-820 DEG C, roughing and the rate under finish rolling stagnation pressure are than about 2:1；Roll rear laminar flow cold
But, rate of cooling is 3-8 DEG C/s, subsequently air cooling, and final cooling temperature is 200-400 DEG C；
(3) Technology for Heating Processing: using high tempering, temperature interval is 550-700 DEG C, and temperature retention time is 1-3 min/mm,
Final tissue signature is bainite structure；
In described rolling mill practice: use TMCP rolling mill practice, reheat temperature and be 1150-1200 DEG C, both can ensure that Ovshinsky
Body crystal grain is grown up not too much, can ensure that again the abundant solid solution of alloying element, the abundant dissolving of particularly Nb element.
550MPa level low compression ratio high-tenacity steel plate for ocean engineering the most according to claim 1, it is characterised in that control
C content 0.06-0.07%.
550MPa level low compression ratio high-tenacity steel plate for ocean engineering the most according to claim 1, it is characterised in that rolling
In technique processed, roughing temperature range 970-1040 DEG C, point 3-6 passes, overall reduction about 60%, workpiece thickness 100-140
mm。
The production method of 550MPa level low compression ratio high-tenacity steel plate for ocean engineering the most according to claim 1, it is special
Levy and be, in rolling mill practice, 760-820 DEG C of finish rolling start rolling temperature interval, 4-6 passes, overall reduction about 30%；After rolling
Employing go around pattern accelerate cooling metal sheets, final cooling temperature 200-400 DEG C, red temperature be less than 500 DEG C.
The production method of 550MPa level low compression ratio high-tenacity steel plate for ocean engineering the most according to claim 1, it is special
Levy and be, be 48h in the described smelting process strand slow cooling time.
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| JP4066905B2 (en) * | 2003-07-31 | 2008-03-26 | Ｊｆｅスチール株式会社 | Manufacturing method of low yield ratio high strength high toughness steel sheet with excellent weld heat affected zone toughness |
| CN102337460B (en) * | 2011-11-14 | 2013-01-09 | 首钢总公司 | Ultrahigh-strength structural steel board for ocean engineering and production method thereof |
| CN102965592B (en) * | 2012-12-11 | 2014-05-28 | 南京钢铁股份有限公司 | Method for producing ocean engineering steel plate with low compression ratio, thick specification and ultrahigh strength |
| CN103436811B (en) * | 2013-09-24 | 2015-07-15 | 济钢集团有限公司 | High-property super-thick steel plate for 500 MPa-level engineering structure and manufacturing method thereof |
| CN103938108B (en) * | 2014-03-14 | 2016-05-11 | 济钢集团有限公司 | A kind of 460MPa level low compression ratio high-tenacity steel plate for ocean engineering and production method |
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