CN102644025A - High-strength and high-toughness steel plate and preparation method thereof - Google Patents
High-strength and high-toughness steel plate and preparation method thereof Download PDFInfo
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- CN102644025A CN102644025A CN2012101224903A CN201210122490A CN102644025A CN 102644025 A CN102644025 A CN 102644025A CN 2012101224903 A CN2012101224903 A CN 2012101224903A CN 201210122490 A CN201210122490 A CN 201210122490A CN 102644025 A CN102644025 A CN 102644025A
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Abstract
The invention discloses a high-strength and high-toughness steel plate and a preparation method thereof. The steel plate comprises the following chemical components by weight percent: 0.03-0.09% of C, 0.20-0.35% of Si, 0.80-1.60% of Mn, 0.06-0.08% of Nb, 1.00-1.35% of Cu, 1.00-1.80% of Ni, 0.62-0.68% of Al, less than or equal to 0.020% of P, less than or equal to 0.010% of S and the balance of Fe and impurities. The steel plate is prepared through reasonable design of alloy components and by adopting controlled rolling, controlled cooling and tempering processes, the yield strength of the steel plate is more than or equal to 650MPa; the tensile strength is 710-900MPa; and the harpy shock absorbed energy is more than or equal to 90J at the temperature of below 60 DEG C. The high-strength and high-toughness steel plate is low in cost, simple in production process, good in strength, low-temperature toughness and welding performance and wide in market prospects and can be widely used for building ocean platforms and ships.
Description
Technical field
This present invention relates to a kind of HS and ductility steel plate and preparation method thereof, is specifically related to have ys>=650MPa tensile strength 710～900MPa, the Charpy shock absorption energy KV under-60 ℃
2Steel plate of>=90J and preparation method thereof.
Background technology
Along with the exploitation of the deep-sea energy and boats and ships gradually to large scale development, common 360MPa and 500MPa level ocean platform and shipping steel can not meet the demands, this application for HS and H.T. marine steel provides vast market prospect.Simultaneously, the ever-increasing manufacturing cost pressure of steel industry makes iron and steel enterprise to reduce production costs to greatest extent.Therefore, the urgent needs that the exploitation performance is more excellent, superstrength deck of boat steel that cost is lower has become hull manufacturing and the Sustainable development of ocean platform building industry.
At present, the HS ocean of domestic production and shipping steel plate, its intensity rank mainly are 320 relatively low～500MPa; For (the steel plate of ys >=620MPa) of high intensity levels more; Along with the rising of intensity rank, C content generally higher (C >=0.10%) in the steel makes steel plate the time need carry out weld preheating and after welding treatment, weldprocedure complicacy in welding; The use cost of downstream user is increased, also wasted mass energy.Simultaneously; In this type of steel plate, generally all added valuable alloying elements (generally all >=0.5%) such as Cr, Mo for increasing in the hardening capacity steel, and steel plate is when producing; Need carry out modified thermal treatment (quenching+tempering) after rolling; Increase the production cost of steel plate greatly, also continued delivery date, seriously restricted HS ocean and the scale operation of shipping steel plate.
Publication number is that the patent of invention of CN 1840724A proposes above ultrahigh-strength steel plates of ys 960MP and method of manufacture thereof, though its ys has reached 960MPa, impelling strength only meets the demands under-40 ℃.
Publication number is that the patent of invention of CN 102021489A proposes a kind of easy welding timeliness plow-steel and thermal treatment process thereof; The minimum 865MPa that reaches of its ys; But its composition complex design; Compoundly in the steel added elements such as Cr, Mo and V, and the impelling strength index only meets the demands under-20 ℃.
Publication number is proposed a kind of large thickness quenched high strength steel and working method thereof by the patent of invention of CN 101363101A; Its ys has reached the 750MPa level; But impelling strength only meets the demands under-40 ℃, and C content (massfraction) is 0.15～0.17% in the steel, and its welding property is not good.And added 1.10～1.20%Cr, 0.40～0.60%Mo element in the steel, rolled the back steel plate and need carry out modifier treatment, manufacturing process head, steel plate manufacturing cost are higher.
Summary of the invention
The objective of the invention is to overcome deficiency of the prior art.A kind of ys >=650MPa is provided, and tensile strength 710～900MPa guarantees steel plate of-60 ℃ of Charpy shock absorption energy >=90J and preparation method thereof.This steel plate composition is reasonable in design, and C content is low, adds the Al element and strengthens, and saves alloying elements such as valuable Mo and Cr, and ME is simple.
The object of the invention is realized through following technical scheme:
A kind of high strength steel plate is characterized in that: this steel plate chemical composition by weight percentage is: C0.03～0.09%, and Si 0.20～0.35%; Mn 0.80～1.60%, and Nb 0.06～0.08%, and Cu 1.00～1.35%; Ni1.00～1.80%; Al 0.62～0.68%, P≤0.020%, the Fe of S≤0.010% and surplus and impurity;
The process step that the preparation method of this steel plate comprises does;
In smelting the casting operation, be by the mentioned component smelting molten steel and be cast into the continuous casting steel billet of certain size;
In the heat tracing operation, be that the continuous casting steel billet that has with said steel plate same composition is heated to 1150～1250 ℃, be incubated 1～3 hour; Make the abundant solid solution of alloying element in the steel, bring into play its highly malleablized effect, guarantee the homogeneity of final finished composition and performance
In rolling process; Be with blank carry out successively the recrystallization zone rolling with the non-recrystallization district rolling, the rolling start rolling temperature in recrystallization zone is 1050～1120 ℃, recrystallization zone compression ratio >=50%; Non-recrystallization district start rolling temperature is 850～900 ℃, non-recrystallization district compression ratio >=60%;
In the controlled chilling operation, be that the steel plate after rolling is quickened cooling, rate of cooling is controlled at 15～30 ℃/s, and final cooling temperature is controlled at 380～450 ℃, and back air cooling is to room temperature;
In heat treatment step, be that the steel plate direct tempering of air cooling to room temperature is handled, be about to steel plate 600～700 ℃ of isothermal temperings, soaking time 1～2 hour, then after with the steel plate air cooling to room temperature.
The present invention is directed to existing market for the demand of ys greater than the 650MPa grade steel plate; Adopt the chemical ingredients proportioning after optimizing; And take controlled rolling and technology for controlled cooling (TMCP) and temper tempering heat treatment method; It is good to produce steel plate, its welding property with HS and H.T., can be widely used in ocean platform and shipbuilding n., has a extensive future.
Compared with prior art; The invention has the advantages that: 1) a kind of HS of the present invention and ductility steel plate and preparation method thereof; Has HS and good low-temperature flexibility coupling; Low C and Fe-Cu-Ni-Al alloying are used in its composition design economical rationality, have saved in traditional composition design and have generally added extremely expensive Cr, Mo element; 2) composition design carbon equivalent of the present invention is low, and gained steel plate welding property is good, can adopt and exempt from the preheating welding; 3) save the molten admittedly quenching process of reheat in the traditional technology, reached the simplification production technique, enhanced productivity, improved the purpose of material mechanical performance, when mass industrialized production, had tangible cost advantage and higher operability.
Description of drawings
The metallographic structure photo of the vertical section of steel plate that Fig. 1 makes for embodiment 1;
Embodiment
Embodiment 1
A kind of HS that present embodiment relates to and high-ductility steel plate thickness are 15mm, and component that it comprises and weight percent thereof are: the Fe of C 0.04%, Si 0.30%, Mn 0.98%, P 0.0075%, S 0.0027%, Nb 0.07%, Cu 1.31%, Ni 1.76%, Al 0.65% and surplus and unavoidable impurities element.
According to above-mentioned steel plate chemical ingredients preparation raw materials for metallurgy, through the 80kg vacuum induction furnace smelting and pour into ingot casting, forging into specification is 140mm * 100mm * 450mm blank;
Steel billet is heated to 1180 ℃, insulation 120min;
The start rolling temperature of steel billet fs roughing is 1100 ℃, and overall compression ratio is 52%, and the start rolling temperature of subordinate phase finish rolling is 850 ℃, and overall compression ratio is 69%, and rolling back steel plate thickness is 15mm;
Steel plate after the hot rolling is carried out the aerosol cooling, the about 18 ℃/s of rate of cooling, final cooling temperature is about 400 ℃;
Hot-rolled steel sheet directly passes through temper, and tempering temperature is 700 ℃, and soaking time is 60min, and air cooling makes the finished product steel plate to room temperature then.Gained mechanical property such as table 1.
Obtained steel plate mechanical property among table 1 embodiment 1
Embodiment 2
A kind of HS that present embodiment relates to and high-ductility steel plate thickness are 30mm, and component that it comprises and weight percent thereof are: the Fe of C 0.04%, Si 0.25%, Mn 1.00%, P 0.008%, S 0.007%, Nb 0.07%, Cu 1.26%, Ni1.00%, Al 0.66% and surplus and unavoidable impurities element.
According to above-mentioned steel plate chemical ingredients preparation raw materials for metallurgy, through the 80kg vacuum induction furnace smelting and pour into ingot casting, forging into specification is 140mm * 220mm * 220mm blank;
Steel billet is heated to 1180 ℃, insulation 120min;
The start rolling temperature of steel billet fs roughing is 1100 ℃, and overall compression ratio is 55%, and the start rolling temperature of subordinate phase finish rolling is 880 ℃, and overall compression ratio is 70%, and rolling back steel plate thickness is 30mm;
Steel plate after the hot rolling is carried out the aerosol cooling, the about 19 ℃/s of rate of cooling, final cooling temperature is about 394 ℃;
Hot-rolled steel sheet directly passes through temper, and tempering temperature is 625 ℃, and soaking time is 90min, and air cooling makes the finished product steel plate to room temperature then.Gained mechanical property such as table 2.
Obtained steel plate mechanical property among table 2 embodiment 2
Embodiment 3
A kind of HS that present embodiment relates to and high-ductility steel plate thickness are 30mm, and component that it comprises and weight percent thereof are: the Fe of C 0.08%, Si 0.28%, Mn 1.6%, P 0.009%, S 0.007%, Nb 0.08%, Cu 1.02%, Ni 1.52%, Al 0.67% and surplus and unavoidable impurities element.
According to above-mentioned steel plate chemical ingredients preparation raw materials for metallurgy, through the 80kg vacuum induction furnace smelting and pour into ingot casting, forging into specification is 140mm * 220mm * 220mm blank;
Steel billet is heated to 1180 ℃, insulation 120min;
The start rolling temperature of steel billet fs roughing is 1100 ℃, and overall compression ratio is 55%, and the start rolling temperature of subordinate phase finish rolling is 850 ℃, and overall compression ratio is 70%, and rolling back steel plate thickness is 30mm;
Steel plate after the hot rolling is carried out the aerosol cooling, the about 16 ℃/s of rate of cooling, final cooling temperature is about 445 ℃;
Hot-rolled steel sheet directly passes through temper, and tempering temperature is 625 ℃, and soaking time is 90min, and back air cooling makes the finished product steel plate to room temperature.Gained mechanical property such as table 3.
Obtained deck of boat steel mechanical property among table 3 embodiment 3
Claims (1)
1. high strength steel plate, it is characterized in that: this steel plate chemical composition by weight percentage is: C 0.03～0.09%, and Si 0.20～0.35%; Mn 0.80～1.60%, and Nb 0.06～0.08%, and Cu 1.00～1.35%; Ni 1.00～1.80%; Al 0.62～0.68%, P≤0.020%, the Fe of S≤0.010% and surplus and impurity;
The process step that the preparation method of this steel plate comprises does;
In smelting the casting operation, be by the mentioned component smelting molten steel and be cast into the continuous casting steel billet of certain size;
In the heat tracing operation, be that the continuous casting steel billet that has with said steel plate same composition is heated to 1150～1250 ℃, be incubated 1～3 hour;
In rolling process; Be with blank carry out successively the recrystallization zone rolling with the non-recrystallization district rolling, the rolling start rolling temperature in recrystallization zone is 1050～1120 ℃, recrystallize compression ratio >=50%; Non-recrystallization district start rolling temperature is 850～900 ℃, non-recrystallization district compression ratio >=60%;
In the controlled chilling operation, be that the steel plate after rolling is quickened cooling, rate of cooling is controlled at 15～30 ℃/s, and final cooling temperature is controlled at 380～450 ℃, and back air cooling is to room temperature;
In heat treatment step, be that the steel plate direct tempering of air cooling to room temperature is handled, be about to steel plate 600～700 ℃ of isothermal temperings, soaking time 1-2 hour, then after with the steel plate air cooling to room temperature.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103484771A (en) * | 2013-10-18 | 2014-01-01 | 北京科技大学 | High-aluminum low-density medium-thickness steel plate for ocean platform and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101649416A (en) * | 2009-09-04 | 2010-02-17 | 江苏省沙钢钢铁研究院有限公司 | High carbon steel wire rod and preparation method thereof |
| CN101660108A (en) * | 2009-10-16 | 2010-03-03 | 江苏省沙钢钢铁研究院有限公司 | Non-quenched acicular structure high strength low yield ratio weathering resistant steel and production method thereof |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101649416A (en) * | 2009-09-04 | 2010-02-17 | 江苏省沙钢钢铁研究院有限公司 | High carbon steel wire rod and preparation method thereof |
| CN101660108A (en) * | 2009-10-16 | 2010-03-03 | 江苏省沙钢钢铁研究院有限公司 | Non-quenched acicular structure high strength low yield ratio weathering resistant steel and production method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103484771A (en) * | 2013-10-18 | 2014-01-01 | 北京科技大学 | High-aluminum low-density medium-thickness steel plate for ocean platform and preparation method thereof |
| CN103484771B (en) * | 2013-10-18 | 2015-10-28 | 北京科技大学 | A kind of ocean platform High-aluminum low-density steel plate and preparation method thereof |
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Denomination of invention: The invention relates to a high strength and toughness steel plate and a preparation method thereof Effective date of registration: 20210901 Granted publication date: 20131225 Pledgee: China Construction Bank Zhangjiagang branch Pledgor: INSTITUTE OF RESEARCH OF IRON & STEEL, JIANGSU PROVINCE/SHA-STEEL, Co.,Ltd. Registration number: Y2021980008707 |