CN108546866A - A kind of production method of 690MPa grade high ductilities structural steel - Google Patents

A kind of production method of 690MPa grade high ductilities structural steel Download PDF

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Publication number
CN108546866A
CN108546866A CN201810298745.9A CN201810298745A CN108546866A CN 108546866 A CN108546866 A CN 108546866A CN 201810298745 A CN201810298745 A CN 201810298745A CN 108546866 A CN108546866 A CN 108546866A
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steel
rolling
temperature
690mpa
steel plate
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CN108546866B (en
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杨永达
王彦锋
狄国标
马长文
黄乐庆
周德光
郑会平
陆士平
白学军
马龙腾
李战军
韩承良
孟东立
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Shougang Group Co Ltd
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Shougang Group Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • 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
    • 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
    • C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
    • 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
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/002—Bainite

Abstract

A kind of production method of 690MPa grade high ductilities structural steel, belongs to low carbon-structural steel controlled rolling technical field.Using converter smelting, top-bottom blowing, pernicious gas and the content of S are reduced；Continuous casting fed to boiler, heating temperature is between 1200 DEG C~1300 DEG C, high pressure water dephosphorization after coming out of the stove；Stand Mill two benches controlled rolling, 720~760 DEG C of finish rolling start rolling temperature carry out stacking slow cooling after rolling rear ACC water coolings.The advantage is that compared to current production technology, shorten production procedure, greatly improve efficiency, steel plate has both excellent low-temperature flexibility and good anti-lamellar tearing performance while with high intensity.

Description

A kind of production method of 690MPa grade high ductilities structural steel
Technical field
The invention belongs to low carbon-structural steel controlled rolling technical field, more particularly to a kind of 690MPa grade high ductilities structural steel Production method.More particularly to a kind of production method of the 690MPa grade high ductility structural steel and irons of 12~60mm of thickness, it is suitable for The fields such as bridge, ocean engineering and skyscraper.The component system that Nb, Ti are added by using low-carbon improves armor plate strength, changes The low-temperature flexibility and welding performance of kind steel plate, are properly added the elements such as Cu, Ni, Cr, Mo, further increase quenching degree, ensure steel Plate intensity.
Background technology
In recent years, the fields such as China's steel bridge, steel building are quickly grown, and are proposed to the upgrading of steel construction steel Urgent demand, current China have become steel bridge great powers in the world, in the large-span suspension bridge, cable-stayed bridge, arch bridge built and be completed Etc. more than half in China, with the development of China express railway and highway, the steel bridge of more large span, more heavy load will continue It emerges in large numbers, bridge needs the structural steel plate of exploitation higher intensity reducing its own weight, raising bearing capacity etc..Currently The bridge steel of China's maximum intensity rank has been developed to 500MPa grades, and Shanghai Changjiang River bridge and Construction of Wuhu Changjiang River Bridge etc. are applied to, The 690MPa grades bridge steel of the following higher intensity, which necessarily becomes, gives priority to target.
In 2000, batch realized application to external 690MPa grades of bridge steel, and such as the alum sea bridge of Japan is with more than 1000 The BHS700W steel plates of ton, yield strength reach 690MPa grades.U.S. same period also development and application HPS100W.In order to meet state The demand of interior bridge enterprise and large-scale steel structure Enterprise Construction LARGE SPAN STEEL BRIDGE and super-high buildings, this patent provide a kind of thickness The bridge steel plate production method with high intensity, high tenacity and good thickness directional properties of 12~60mm.
The Publication No. CN101418418A patent of invention yield strengths 690MPa of Baoshan Iron ＆ Steel Co., Ltd's application Grade low-crackle sensitive steel and its manufacturing method composition design are different from this patent, which is quenched by adding B element raising Permeability, B element influence greatly the low-temperature flexibility of steel, and the steel plate low-temperature flexibility of production, which is obviously substantially less than in this patent, produces Product.
It is strong that the Publication No. CN103695773A patents of invention of Wuhan Iron ＆ Steel's application provide a kind of surrender 690MPa grades of fire resistant and weather resistant anti-shock construction(al)steel production methods are spent, are mainly characterized in that by adding 1.82-2.55%Mn members Element reduces the noble alloys elements such as Cu, Ni, Mo, and cost of alloy is relatively low, but its product low-temperature flexibility only ensures -20 DEG C of ballistic works, with This patent differs greatly in low-temperature flexibility.
The Publication No. CN105950849A patents of invention of Wuyang Iron ＆ Steel Co., Ltd.'s application have provided a kind of low The production method of 690MPa grades of high strength steel plates of yield tensile ratio is mainly characterized in that with 0.10% carbon addition Cu, Ni, Cr, Mo alloy member Based on element；Tissue is based on bainite+ferrite；Technique is TMCP+ tempering process, realizes 690MPa grades of Plate Productions.This is specially Profit is dosed with 0.05% carbon outside Cu, Ni, Cr, Mo alloy, La and Ce rare earth alloy elements are added to；Organizational controls is with bainite It is main, no ferrite；Technique uses TMCP techniques, final cooling temperature to be substantially less than documents；The steel plate low temperature of this patent development is tough Property meet -80 DEG C of ＞ 120J, toughness higher.
Invention content
The purpose of the present invention is to provide a kind of production methods of 690MPa grade high ductilities structural steel, solve steel plate and are having The problem of having high intensity simultaneously, excellent low-temperature flexibility and good anti-lamellar tearing performance can not be had both.Pass through low-carbon on ingredient The composition design for adding Nb, Ti improves armor plate strength using means such as refined crystalline strengthening and precipitation strengths, adds Cu, Ni, Cr, Mo Equal alloying elements, improve the quenching degree of steel plate, control bainite structure type and content, realize high intensity, the stabilization of high tenacity Control, and La and Ce rare earth alloys are added into steel, to inclusion modification micronization processes, improve comprehensive performance.In technique, Entrance finishing temperature is less than 760 DEG C, and the accumulation of high density dislocation is realized by low-temperature deformation, cold eventually using strong cold technique after rolling Temperature controls≤350 DEG C, ensures to obtain tiny bainite structure at steel plate thickness 1/4 with center portion, and it is high-strength to ensure that steel plate has Degree and good low-temperature flexibility.
It is high to be suitable for the 690MPa grades that thickness is 12~60mm for a kind of production method of 690MPa grade high ductilities structural steel Ductile structure steel.Specific steps and parameter is as follows:
1, smelting process：Using converter smelting, by top blast or top bottom O content control in 15ppm hereinafter, H contents exist For 1.5ppm hereinafter, S contents are not more than 20ppm, control influences Elements C≤0.08wt% of cold cracking Sensitivity Index, Si 0.20~ Between 0.50wt%, Mn between 1.00~3.00wt%, Cu between 0.40~1.50wt%, Cr 0.40~ Between 1.30wt%, for Ni between 0.50~2.00wt%, Mo ensures steel plate Pcm≤0.30 between 0.2~0.80wt%, And the La of addition≤0.0080wt% and≤0.0040Ce rare earth alloys into steel, make Al2O3Field trash is refined within 10 μm；
2, continuous casting process：Design continuous casting billet base molded dimension, thickness specification is 180~400mm, width 1800~ 2400mm；
3, heating process：Steel billet cold charge enters stove, and heating temperature is between 1200 DEG C~1300 DEG C, and heating time is in 240min ~400min, laggard horizontal high voltage water de-scaling of coming out of the stove；
4, rolling mill practice：Using Stand Mill two benches controlled rolling process, roughing pressure is carried out between 1050~1150 DEG C, is protected Maximum roughing percentage pass reduction >=20% is demonstrate,proved, steel is put after continuous rolling to holding gauge；Finish rolling stage, finish rolling start rolling temperature 720 ~760 DEG C, laggard ACC water coolings are rolled, 270~350 DEG C of final cooling temperature carries out stacking slow cooling after water cooling.
The chemical composition mass percent of steel plate：C be≤0.08%, Si be 0.20~0.50%, Mn be 1.00~ 3.00%, P≤0.015%, S≤0.002%, Al be 0.020~0.05%, Nb≤0.050%, Ti≤0.020%, Cu0.40~1.50%, Cr0.40~1.30%, Ni0.50~2.00%, Mo0.2~0.80%, La≤0.0080%, Ce≤ 0.0040%, remaining is Fe and inevitable impurity.B element cannot be added into steel.
The steel plate yield strength ＞ 690MPa of production, tensile strength ＞ 830MPa, elongation after fracture >=14%, -80 DEG C vertical To ballistic work ＞ 120J, the Z-direction contraction percentage of area >=35%, the structural steel of exploitation has high intensity, excellent low-temperature flexibility and good Good thickness directional properties.
It is using the foundation of this method：When producing the 690MPa level structure steel of high intensity, high tenacity, since armor plate strength refers to Mark and toughness index be required to it is higher, first of all for ensure low-temperature flexibility, it is necessary to reduce carbon content, the decline of carbon content is necessarily led It causes intensity to decline to a great extent, adds microalloy element Nb, Ti etc. thus, improved using means such as refined crystalline strengthening and precipitation strengths strong Degree, in order to further increase armor plate strength, is added to the elements such as Cu, Ni, Cr, Mo appropriate, improves the quenching degree of ingredient, be Follow-up water cooling improves quenching degree and lays the foundation.Rare earth alloy La and Ce are added in steel to be conducive to refine field trash, and then are improved tough Property, forbid to add B element, avoids adverse effect of the B element to TMCP state steel plate low-temperature flexibilities.Become using reduction finish rolling in technique Shape area temperature and reduction final cooling temperature technique, are deformed by finish rolling low temp area and improve dislocation integral density in crystal grain, after rolling Strong water cooling promotes phase deformed nucleus in crystal grain, thinning microstructure to improve armor plate strength and toughness.
The advantage of the invention is that：
1, such 690MPa grades of steel plates of 12~60mm thickness are produced, pneumatic steelmaking-continuous casting-steel rolling is used, compared to adopting Such steel plate is produced with hardening and tempering process, production procedure is greatly shortened, and production efficiency greatly improves；
2, under the process conditions that the present invention designs, the structural steel and iron good mechanical performance of 12~60mm, yield strength ＞ 690MPa, tensile strength ＞ 830MPa, elongation after fracture >=14%, -80 DEG C of ballistic work ＞ 120J, Z to the contraction percentage of area >= 35%, every mechanical performance index is good.
Description of the drawings
Fig. 1 is metallographic structure schematic diagram at 16mm steel plates thickness 1/4.
Fig. 2 is center portion metallographic structure schematic diagram at 16mm steel plates thickness 1/2.
Fig. 3 is metallographic structure schematic diagram at 56mm steel plates thickness 1/4.
Fig. 4 is center portion metallographic structure schematic diagram at 56mm steel plates thickness 1/2.
Specific implementation method
Embodiment 1
16mm thickness bridge steel plates, using continuous casting billet size 250mm thickness × 2000mm wide × 4000mm long, finished steel plate size For 16mm thickness × 2650mm width x length degree, cold charge, 1250 DEG C of heating temperature, Stand Mill two benches controlled rolling, rough rolling step, most main road Secondary reduction ratio 28.5%, continuous rolling to waiting for that temperature thickness 60mm puts steel, 750 DEG C of finish rolling start rolling temperature, roll by 720 DEG C of finishing temperature Water cooling afterwards, 320 DEG C of final cooling temperature.Steel plate chemical composition is shown in Table 1, and mechanical property is shown in Table 2, and attached drawing 1 is shown in metallographic structure.
Table 1：The chemical composition (weight, %) of 16mm steel plates
C Si Mn P S Alt Nb Ti Ni Cr Cu Mo
0.05 0.26 1.4 0.012 0.0020 0.035 0.035 0.015 0.85 0.50 1.0 0.58
Table 2：16mm mechanical property of steel plate inspection results
Embodiment 2
56mm is thick, 3500mm wide bridge steel plates, using continuous casting billet size 400mm thickness × 1800mm wide × 3900mm long, at Product plate size is 56mm thickness × 2200mm width x length degree, cold charge, 1280 DEG C of heating temperature, Stand Mill two benches controlled rolling, roughing In the stage, maximum percentage pass reduction 25%, continuous rolling is to waiting for that temperature thickness 120mm puts steel, 720 DEG C of finish rolling start rolling temperature, finish to gauge temperature 696 DEG C of degree, rolls rear water cooling, 270 DEG C of final cooling temperature.Steel plate chemical composition is shown in Table 3, and mechanical property is shown in Table 4, and attached drawing is shown in metallographic structure 2。
Table 3：The chemical composition (weight, %) of 56mm steel plates
C Si Mn P S Alt Nb Ti Ni Cr Cu Mo
0.05 0.30 1.45 0.012 0.0015 0.035 0.030 0.018 1.35 0.60 1.0 0.60
Table 4：56mm mechanical property of steel plate inspection results

Claims (4)

1. a kind of production method of 690MPa grade high ductilities structural steel, which is characterized in that specific steps and parameter is as follows：
1) smelting process：Using converter smelting, pass through top blast or top bottom blowing；It is vacuum-treated using LF stoves and RH stoves, O contains Amount control in 15ppm hereinafter, H content in 1.5ppm hereinafter, S contents be not more than 20ppm, control influence cold cracking Sensitivity Index member Plain C≤0.08wt%, Si between 0.20~0.50wt%, Mn between 1.00~3.00wt%, Cu 0.40~ Between 1.50wt%, Cr is between 0.40~1.30wt%, and Ni is between 0.50~2.00wt%, and Mo is in 0.2~0.80wt% Between, ensure steel plate Pcm≤0.30, and the La of addition≤0.0080wt% and≤0.0040Ce rare earth alloys into steel, makes Al2O3Field trash is refined within 10 μm；
2) continuous casting process：Continuous casting billet base molded dimension is designed, thickness specification is 180~400mm, and width is in 1800~2400mm；
3) heating process：Steel billet cold charge enters stove, heating temperature between 1200 DEG C~1300 DEG C, heating time 240min~ 400min, laggard horizontal high voltage water de-scaling of coming out of the stove；
4) rolling mill practice：Using Stand Mill two benches controlled rolling process, roughing pressure is carried out between 1050~1150 DEG C, is ensured most Big roughing percentage pass reduction >=20% puts steel after continuous rolling to holding gauge；Finish rolling stage, finish rolling start rolling temperature 720~760 DEG C, laggard ACC water coolings are rolled, 270~350 DEG C of final cooling temperature carries out stacking slow cooling after water cooling.
2. according to the method described in claim 1, it is characterized in that, it is 12~60mm's that the production method, which is suitable for thickness, 690MPa grade high ductility structural steel.
3. according to the method described in claim 1, it is characterized in that, the steel plate chemical composition quality percentage of the method production Than：It is 0.20~0.50%, Mn is 1.00~3.00%, P≤0.015% that C, which is≤0.08%, Si, and S≤0.002%, Al are 0.020~0.05%, Nb≤0.050%, Ti≤0.020%, Cu0.40~1.50%, Cr0.40~1.30%, Ni0.50~ 2.00%, Mo0.2~0.80%, La≤0.0080%, Ce≤0.0040%, remaining be Fe and inevitable impurity, chemistry at B element cannot be added into steel in part.
4. according to the method described in claim 1, it is characterized in that, the method production steel plate yield strength ＞ 690MPa, Tensile strength ＞ 830MPa, elongation after fracture >=14%, -80 DEG C of impact of collision work(＞ 120J, the Z-direction contraction percentage of area >=35%.
CN201810298745.9A 2018-04-04 2018-04-04 Production method of 690MPa grade high-toughness structural steel Active CN108546866B (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110527923A (en) * 2019-06-03 2019-12-03 武汉钢铁有限公司 A kind of 600MPa grades of body of a motor car high-yield-ratio structural steel and production method
CN111101063A (en) * 2020-01-07 2020-05-05 北京科技大学 690 MPa-grade anti-seismic, corrosion-resistant and fire-resistant medium plate steel and manufacturing method thereof
CN112831717A (en) * 2020-12-03 2021-05-25 南京钢铁股份有限公司 690 MPa-grade low-yield-ratio thin-specification weather-resistant bridge steel and manufacturing method thereof
CN114959480A (en) * 2022-05-31 2022-08-30 本钢板材股份有限公司 High-strength hot-rolled coil for 650 MPa-level thin and wide tank and production method thereof

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US5478417A (en) * 1992-09-18 1995-12-26 Goro Nickel S.A. Controlled thermal expansion superalloy
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CN104630655A (en) * 2014-11-28 2015-05-20 武汉钢铁(集团)公司 Extra-thick steel plate having excellent balance between strength and toughness and used for welded structure and production process thereof
CN106191669A (en) * 2016-07-08 2016-12-07 首钢总公司 A kind of weather-proof structural steel plate and production method thereof
JP2017190481A (en) * 2016-04-12 2017-10-19 Ｊｆｅスチール株式会社 Thick steel sheet and manufacturing method therefor

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US5478417A (en) * 1992-09-18 1995-12-26 Goro Nickel S.A. Controlled thermal expansion superalloy
CN101984119A (en) * 2010-11-26 2011-03-09 江苏省沙钢钢铁研究院有限公司 NV-F690 ultrahigh strength ship plate steel and manufacture method thereof
CN102051525A (en) * 2010-12-07 2011-05-11 秦皇岛首秦金属材料有限公司 Method for producing steel plate used for Q420qE bridge at low cost
CN102226255A (en) * 2011-06-08 2011-10-26 江苏省沙钢钢铁研究院有限公司 Steel plate with high strength and toughness and 690MPa of yield strength and preparation process thereof
CN104630655A (en) * 2014-11-28 2015-05-20 武汉钢铁(集团)公司 Extra-thick steel plate having excellent balance between strength and toughness and used for welded structure and production process thereof
JP2017190481A (en) * 2016-04-12 2017-10-19 Ｊｆｅスチール株式会社 Thick steel sheet and manufacturing method therefor
CN106191669A (en) * 2016-07-08 2016-12-07 首钢总公司 A kind of weather-proof structural steel plate and production method thereof

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110527923A (en) * 2019-06-03 2019-12-03 武汉钢铁有限公司 A kind of 600MPa grades of body of a motor car high-yield-ratio structural steel and production method
CN111101063A (en) * 2020-01-07 2020-05-05 北京科技大学 690 MPa-grade anti-seismic, corrosion-resistant and fire-resistant medium plate steel and manufacturing method thereof
CN112831717A (en) * 2020-12-03 2021-05-25 南京钢铁股份有限公司 690 MPa-grade low-yield-ratio thin-specification weather-resistant bridge steel and manufacturing method thereof
CN112831717B (en) * 2020-12-03 2022-04-19 南京钢铁股份有限公司 690 MPa-grade low-yield-ratio thin-specification weather-resistant bridge steel and manufacturing method thereof
CN114959480A (en) * 2022-05-31 2022-08-30 本钢板材股份有限公司 High-strength hot-rolled coil for 650 MPa-level thin and wide tank and production method thereof

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