CN1785543A - Technology of producing Ti micro alloyed high weather resistant steel plate using thin plate blank continuous casting continuous milling process - Google Patents

Technology of producing Ti micro alloyed high weather resistant steel plate using thin plate blank continuous casting continuous milling process Download PDF

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CN1785543A
CN1785543A CN 200510036889 CN200510036889A CN1785543A CN 1785543 A CN1785543 A CN 1785543A CN 200510036889 CN200510036889 CN 200510036889 CN 200510036889 A CN200510036889 A CN 200510036889A CN 1785543 A CN1785543 A CN 1785543A
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steel
continuous casting
technology
steel plate
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CN100345640C (en
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毛新平
康永林
李烈军
林振源
周建
谢利群
陈学文
许传棻
刘义军
邹安华
庄汉洲
王湘飞
张武彬
霍向东
孙新军
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ZHUJIANG IRON AND STEEL CO Ltd GUANGZHOU
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ZHUJIANG IRON AND STEEL CO Ltd GUANGZHOU
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Abstract

A conticasting and tandem rolling technology for manufacturing the high-strength and-weatherability Ti-microalloyed steel plate includes such steps as smelting, refining, conticasting, solidifying, heating, hot rolling, laminar flow cooling and coiling. Its advantages are high strength, high shaping performance, high weatherability and high weldability.

Description

A kind of technology of using bar strip continuous casting and rolling flow path production Ti micro-alloying high-strength weathering steel plate
Technical field
The present invention relates to a kind of production technology of high-strength weathering steel plate.
Background technology
The high-strength weathering steel plate is the important material of using in container, railcar, city underground compartment etc.Along with the economic development of China, the logistics rapid growth, high-strength weathering steel all plays an important role in loss of weight, speed-raising, the increase volume of goods transported, prolongation service life of equipment and reduction logistics cost.High-strength weathering steel is meant σ sThe weathering steel of 〉=450MPa, this class steel mainly is used in the manufacturing of special container, bridge and high-speed train railway carriage.Because high-strength weathering steel is therefore very high to metallurgical technology process and the requirement of equipment control level in demanding demanding intensity rank of corrosion proof while and forming property and welding performance preferably.
(1) general situation of development of external weathering steel
The U.S. is to use weather resisting steel country the earliest, and 1913 just begin to develop the atmospheric corrosion resistance steel, develop the Cor-tenA steel that contains Cu-P-Cr-Ni, and its atmospheric corrosion resistance is 4 times of straight carbon steel.The U.S. developed on the basis of Cor-tenA with chromansil and turned to main Cor-Ten B series afterwards.Two kinds of weathering steels have obtained using widely in Europe, Japan.
The development of Japan's weathering steel is later, and nineteen fifty-five begins trial-production.Introduce the Cor-tenA steel patent of the U.S., produced the SPA-H steel, and developed the weather resisting steel of Cu-P series,, both improved the atmospheric corrosion resistance of steel, alleviated the deadweight of product again, improved carrying capacity as the Yaw-Ten50 steel grade.After adopting Yaw-Ten50 as the Shinkansen train of Japan, light weight has alleviated 7%, and Yaw-Ten50 is adopted on the oil truck chassis, has cancelled curb girder, weight reduction 22%, loading capacity has increased 5t.At present, Japan has developed the superhigh intensity weathering steel that yield strength surpasses 700Mpa.
India copys Corten-A, develops the Sailcor-A steel series, is used to produce passenger train and lorry.The weathering steel of Korea S mainly is the RAWS50 that the Pu item is produced.
Many industrially developed country also are extensive use of weather resisting steel as Germany, Sweden and make vehicle in Europe, are mainly Cu-P-Cr-Ni system or Cu-P-Cr system.The development forefront be the Domex series that Sweden steel company develops recently, yield strength is 500,550,600,650, the container weathering steel of 700MPa.
The chemical composition of external representative weathering steel sees Table 1.
The chemical composition of the external representative weathering steel of table 1
Country origin Grade of steel W’ B/％
C Si Mn P S Cr Ni Cu Ti V Mo
The U.S. CORTEN-A ≤0.12 0.25～0.75 0.20～0.50 0.07～0.15 ≤0.05 0.30～1.25 ≤0.65 0.25～0.55
MAYARI-R ≤0.12 0.10～0.50 0.50～1.00 0.08～0.12 ≤0.05 0.40～1.00 0.25～0.75 0.50～0.70
TRIIEN ≤0.22 0.30 1.25 ＜0.04 ≤0.05 0.20 0.02
SPA-H ≤0.12 0.25～0.75 0.20～0.50 0.07～0.15 ≤0.04 0.30～1.25 ≤0.65 0.25～0.60
SPA-C ≤0.12 0.25～0.75 0.20～0.50 0.07～0.15 ≤0.05 0.30～1.00 ≤0.45 0.25～0.55
Japan PUI CORTEN ≤0.12 0.25～0.75 0.20～0.50 0.07～0.15 ≤0.05 0.30～1.25 ≤0.65 0.25～0.50
CUPTEN-G ≤0.12 ≤0.06 ≤0.06 0.06～0.12 ≤0.04 0.40～1.20 0.20～0.50 ≤0.15 ≤0.35
YAWENSO ≤0.12 ≤0.35 0.60～0.90 0.06～0.12 ≤0.04 0.25～0.55
Germany S135/50 0.07～0.12 0.30～0.60 0.30～0.50 0.08～0.13 ≤0.05 0.07～1.00 0.20～0.35
KT52-3 0.08～0.12 0.25～0.50 0.90～1.20 0.05～0.09 ≤0.04 0.50～0.80 0.30～0.50 0.04～0.10
Russia 10XHдП ≤0.12 0.17～0.37 0.30～0.60 0.07～0.12 ≤0.035 0.50～0.80 0.30～0.60 0.30～0.50
Poland 10H ≤0.15 0.30～0.70 0.25～0.50 ＜0.15 ＜0.05 0.05～0.80 0.25～0.55
Sweden DONEX 600 ≤0.12 ≤0.30 ≤0.19 ≤0.025 ≤0.010 Al≤0.015 contains small amount of N b, V, Ti
DONEX 700 ≤0.12 ≤0.40 ≤2.10 ≤0.025 ≤0.010 Al≤0.015 contains small amount of N b, V, Ti, Mb
(2) research and development of domestic high-strength weathering steel plate and application scenario
In recent years, China's Baosteel, Wuhan Iron and Steel Plant, this steel, Anshan iron and steel plant, climb traditional process hot rolled strip production line such as steel and mass-produced the high-strength weathering steel plate that container and railway etc. are used, China is from the extensive development weathering steel sixties in 20th century, set about the tackling key problem of weathering steel the eighties and drop into batch process, enter the nineties, developed a collection of grade of steel, Cu-P series, Cu-P-Re series, Cu, P, Cr, Ni series are wherein arranged, and 09CuPTiRe, 08CuPVRe, 10MnCuPTi and 09CuPCrNi have become the leading material that vehicle is made.
Weathering steel has strict requirement to corrosion resistance, and its composition also has bigger difference than other steel grades.The chemical composition of domestic representative weathering steel sees Table 2.
The chemical composition of the domestic representative weathering steel of table 2
Routine number W B％
C Si Mn P S Cr Ni Cu Ti V Re
05CuPCrNi ≤0.09 0.20～0.50 0.20～0.50 0.05～0.12 ≤0.04 0.30～1.25 ≤0.65 0.25～0.50
06CuPRe ≤0.08 0.10～0.40 0.15～0.45 0.06～0.12 ≤0.035 0.25～0.30 Addition≤0.12
09CuPCrNi ≤0.12 0.20～0.50 0.20～0.50 0.07～0.12 ＜0.04 0.30～0.60 0.25～0.40 0.25～0.35
09CuPliRe ≤0.12 0.20～0.40 0.25～0.55 0.07～0.12 ＜0.04 0.01 0.01 0.25～0.35 ＜0.03 0.15
B480GNQR ≤0.12 0.25～0.75 0.20～0.50 0.07～0.15 ≤0.03 0.30～1.25 ≤0.65 1.25～0.55
B160NQ ≤0.12 0.12～0.35 ≤1.00 0.06～0.12 ≤0.03 0.20～0.40 ≤0.10
10CrNiCuP ≤0.12 0.10～0.40 0.20～0.50 0.07～0.12 ＜0.04 0.03～0.65 0.25～0.50 0.25～0.45
08CuPVRe ≤0.12 0.20～0.40 0.20～0.50 0.07～0.12 ＜0.04 0.25～0.45 0.02～0.08 0.02～0.20
09CuPRe ≤0.12 0.17～0.37 0.50～0.80 0.07～0.12 ＜0.045 0.25～0.40 0.15
08CuP ≤0.12 0.20～0.40 0.20～0.50 0.07～0.12 ＜0.045 0.25～0.45
Domestic Anshan iron and steel plant, Baosteel, Wuhan Iron and Steel Plant and climb the yield strength of high-strength weathering steel of enterprise's Development and Production that several families such as steel adopt traditional processes in 400MPa～550MPa level, correlated performance sees Table 3.
The performance of the high-strength weathering steel of the domestic employing traditional process of table 3 Development and Production
Steel mill Grade of steel or rank Specification/mm YS /MPa TS /MPa Percentage elongation/% Impact property Yield tensile ratio
Baosteel Q400NQR1 12-14 520 600 35 -40℃(J)333 0.87
The 400MPa level 405 505 22 177 0.80
460 545 29 285 0.84
Q450NQR1 525 600 30 0.87
The 450MPa level 455 550 22 0.83
485 570 27 0.85
Wuhan Iron and Steel Plant W400QN 3.0 433 551 35.5 0.79
444 552 36.5 0.81
458 582 31.2 0.79
459 579 33.7 0.79
10.0 440 535 31 0.82
425 525 32 0.81
Anshan iron and steel plant ANH400 6.0 415 555 31 -40℃(J)64 0.75
ANH450 7.0 480 595 28 84 0.81
ANH500 7.0 555 660 28 70 0.84
ANH550 7.0 575 675 29 58 0.85
This steel 09CuPCrNi- Nb 6.0 525 610 25 -20℃(J)138 0.86
490 600 28 0.82
530 625 23 -40℃(J)109 0.85
505 590 28 0.85
510 615 28 0.83
470 565 28 0.83
09CuPTiRE- Nb 6.0 470 550 31 0.85
485 560 27 0.86
475 545 26 0.87
Climb steel ≥400 3-8 400-480 500- 600 24-40 0.80
≥450 450-510 600- 680 24-35 0.75
≥500 500-580 700- 760 22-32 0.73
(3) bar strip continuous casting and rolling flow path high-strength weathering steel research and development overview
The feature of the close-coupled band steel production technology (Compact Strip Production is called for short CSP) that later 1980s succeeds in U.S. Niu Ke company is a continuous casting and rolling technique of sheet bar.The CSP line of pearl steel is article one sheet billet continuous casting and rolling production line of China, and the pearl steel attracts people's attention in the development aspect the employing CSP technology production weathering steel in recent years, has become the weathering steel sheet material production base of domestic and international maximum.CSP enterprises such as Ma Gang, Handan Iron and Steel Co, ripples steel also in succession Development and Production go out in other weather-resistant steel plate of low intensity level.Simultaneously, the technology and the structure property Related Mechanism that adopt continuous casting and rolling technique of sheet bar to produce weathering steel are also studied.
In sum, on the research and development production traditional process at home and abroad of high-strength weathering steel, be mature on the whole to the controlling of production process technology from the kind of composition design, Development and Production goes out the high-strength weathering steel of heterogeneity series, and intensity rank has reached 700MPa.
Adopt the new composition design and processes of the above high-strength weathering steel plate of continuous casting and rolling technique of sheet bar production yield strength 450MPa to yet there are no report at home and abroad.Because the metallurgical process of CSP, metallurgical process of setting feature, phase transformation history and the technical process of material all have different with traditional flow process, in the sheet billet continuous casting and rolling production line of having gone into operation in the world at present, account for 2nd/3rd, the CSP line, and the CSP line is difficult to the peritectic steel of production carbon content at 0.08-0.16%, therefore need on metallurgically design and technology controlling and process, take new design and processes route, produce the high-strength weathering steel plate that is suitable for bar strip continuous casting and rolling flow path at lower cost, to meet the need of market.
Summary of the invention
The object of the present invention is to provide a kind of technology that bar strip continuous casting and rolling flow path is produced Ti micro-alloying high-strength weathering steel plate of using.
Purpose of the present invention is achieved by following technical scheme:
A kind of technology of using bar strip continuous casting and rolling flow path production Ti micro-alloying high-strength weathering steel plate, this technology is at the metallurgically of bar strip continuous casting and rolling flow path characteristics and molten steel, adopt electric furnace or converter smelting, refining, sheet blank continuous casting, directly enter roller-bottom type heating or soaking pit behind the casting blank solidification, hot rolling, the laminar flow cooling, the coiling technique flow process, its medium thin slab charging temperature is 900～1100 ℃, 1050～1180 ℃ of tapping temperatures, 850～910 ℃ of finishing temperatures, coiling temperature is 550～650 ℃ after the laminar flow cooling, and the metallurgically scope of molten steel is: C:0.04～0.07wt%; Si:0.3～0.5wt%; Mn:0.4～1.2wt%; P:0.075～0.10wt%; S :≤0.005wt%; Cu:0.20～0.40wt%; Ni:0.15～0.35wt%; Ti:0.02～0.15wt%; Cr:0.3～0.5wt%; Alt:0.025～0.035wt%; O :≤0.003wt%; N :≤0.006wt%.
The yield strength scope of the Ti micro-alloying high-strength weathering steel plate of employing explained hereafter of the present invention is at 450MPa～700MPa, and the sheet metal thickness scope is 1.0～8.0mm.
Characteristics of the present invention are that the characteristics of performance CSP abbreviated system according to the grain refinement and the nano-scale precipitate precipitation strength principle of steel, adopt Ti micro-alloying technology production high-performance, high-strength weather-proof steel plate.Its advantage is, can stably obtain high strength, high formability energy, high-weatherability and the good welding performance of steel plate, the metallurgically of steel is simpler, the alloying production cost is lower, is to be used to the desirable sheet material that the industrial plants of producing container, railcar and needing the weather-resistant and high-strength degree are built.
The specific embodiment
The present invention uses the technology that bar strip continuous casting and rolling flow path is produced Ti micro-alloying high-strength weathering steel plate, metallurgically at bar strip continuous casting and rolling flow path characteristics and molten steel, adopt electric furnace or converter smelting, refining, sheet blank continuous casting, directly enter roller-bottom type heating or soaking pit behind the casting blank solidification, hot rolling, the laminar flow cooling, the coiling technique flow process, its medium thin slab charging temperature is 900～1100 ℃, 1050～1180 ℃ of tapping temperatures, 850～910 ℃ of finishing temperatures, coiling temperature is 550～650 ℃ after the laminar flow cooling, and the metallurgically scope of molten steel is: C:0.04～0.07wt%; Si:0.3～0.5wt%; Mn:0.4～1.2wt%; P:0.075～0.10wt%; S :≤0.005wt%; Cu:0.20～0.40wt%; Ni:0.15～0.35wt%; Ti:0.02～0.15wt%; Cr:0.3～0.5wt%; Alt:0.025～0.035wt%; O :≤0.003wt%; N :≤0.006wt%.
At above technology, enumerate some embodiment results below, see Table 5.
Table 5 is used the embodiment result that bar strip continuous casting and rolling flow path is produced the Ti micro-alloying high-strength weathering steel]
Embodiment Main technologic parameters Thickness/mm Yield strength/MPa Tensile strength/MPa Yield tensile ratio Percentage elongation/% Wide clod wash/d=0.5a
Embodiment 1 Ti content: 0.04～0.05wt% charging temperature: 980～1000 ℃ of tapping temperatures: 1050～1130 ℃ of finishing temperatures: 880～900 ℃ of coiling temperatures: 580～620 ℃ 1.6 545 630 0.865 27 Qualified
1.6 570 650 0.877 24 Qualified
2 475 565 0.84 30 Qualified
2 470 565 0.831 31 Qualified
3 539 626 0.861 30.2 Qualified
3 567 645 0.879 26.4 Qualified
6 550 630 0.87 27 Qualified
6 535 620 0.86 30 Qualified
Embodiment 2 Ti content: 0.06～0.08wt% charging temperature: 980～1000 ℃ of tapping temperatures: 1050～1150 ℃ of finishing temperatures: 860～910 ℃ of coiling temperatures: 560～600 ℃ 4 565 650 0.869 26 Qualified
4 580 645 0.899 27 Qualified
4 565 640 0.883 27 Qualified
4 565 655 0.862 24 Qualified
6 535 615 0.87 28 Qualified
6 530 615 0.862 34 Qualified
6 550 620 0.887 28 Qualified
6 520 600 0.867 35 Qualified
6 535 620 0.863 28 Qualified
Embodiment 3 Ti content: 0.09～0.14wt% charging temperature: 980～1000 ℃ of tapping temperatures: 1120～1150 ℃ of finishing temperatures: 890～910 ℃ of coiling temperatures: 580～600 ℃ 1.7 660 710 0.93 24 Qualified
1.7 645 705 0.91 26 Qualified
2 680 795 0.86 19 Qualified
2 695 775 0.9 23 Qualified
2.5 660 745 0.89 24 Qualified
2.5 680 760 0.89 19 Qualified
3 675 755 0.89 23 Qualified
3 630 710 0.89 19 Qualified
2 650 725 0.9 22 Qualified
2 660 730 0.9 22 Qualified
4 605 680 0.89 23 Qualified
4 630 715 0.88 20 Qualified

Claims (1)

1, a kind of technology of using bar strip continuous casting and rolling flow path production Ti micro-alloying high-strength weathering steel plate, it is characterized in that metallurgically at bar strip continuous casting and rolling flow path characteristics and molten steel, adopt electric furnace or converter smelting, refining, sheet blank continuous casting, directly enter roller-bottom type heating or soaking pit behind the casting blank solidification, hot rolling, the laminar flow cooling, the coiling technique flow process, its medium thin slab charging temperature is 900～1100 ℃, 1050～1180 ℃ of tapping temperatures, 850～910 ℃ of finishing temperatures, coiling temperature is 550～650 ℃ after the laminar flow cooling, and the metallurgically scope of molten steel is: C:0.04～0.07wt%; Si:0.3～0.5wt%; Mn:0.4～1.2wt%; P:0.075～0.10wt%; S :≤0.005wt%; Cu:0.20～0.40wt%; Ni:0.15～0.35wt%; Ti:0.02～0.15wt%; Cr:0.3～0.5wt%; Alt:0.025～0.035wt%; O :≤0.003wt%; N :≤0.006wt%.
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CN101994065B (en) * 2010-09-30 2012-07-18 广州珠江钢铁有限责任公司 550Mpa cold-rolled steel plate with good weather resistance and preparation method thereof
CN105478702A (en) * 2015-12-11 2016-04-13 钢铁研究总院 Method for refining TiC in TiC particle reinforced type wear-resistant steels
CN107557678A (en) * 2016-06-30 2018-01-09 鞍钢股份有限公司 Inexpensive 550MPa levels hot rolling container weathering steel and its manufacture method
CN106381451A (en) * 2016-09-29 2017-02-08 马钢(集团)控股有限公司 1000MPa-level hot-rolled martensitic steel produced through CSP process and production method thereof
CN107058873A (en) * 2017-05-31 2017-08-18 武汉钢铁有限公司 Rel >=550MPa railway containers steel and method are produced with CSP
CN109881090A (en) * 2019-02-21 2019-06-14 江苏沙钢集团有限公司 A kind of low cost weathering steel and its production method
CN110878405A (en) * 2019-11-13 2020-03-13 甘肃酒钢集团宏兴钢铁股份有限公司 700 Mpa-grade high-strength weather-resistant steel strip and CSP (cast Steel plate) process production method thereof
CN114892095A (en) * 2022-06-01 2022-08-12 张家港扬子江冷轧板有限公司 High-strength weathering steel for thin S450NH carriage and preparation method thereof

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