CN103114186B - Control cooling method of easy-welding high-performance steel plate - Google Patents
Control cooling method of easy-welding high-performance steel plate Download PDFInfo
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- CN103114186B CN103114186B CN201310083168.9A CN201310083168A CN103114186B CN 103114186 B CN103114186 B CN 103114186B CN 201310083168 A CN201310083168 A CN 201310083168A CN 103114186 B CN103114186 B CN 103114186B
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Abstract
The invention provides a technical scheme of a control cooling method of an easy-welding high-performance steel plate. The easy-welding high-performance steel plate comprises the following chemical components in percentage by weight: 0.05-0.09% of C, 0.1-0.25% of Si, 1.55-1.65% of Mn, 0.025-0.035% of Nb, 0.025-0.035% of V, 0.20-0.30% of Cr, 0.0008-0.0025% of B, 0.020-0.045% of Alt, 0.015-0.030% of Ti and billet of which the low-welding crack sensitivity index Pcm is less than 0.21%; a final steel plate with the thickness of 12-60mm is rolled in a non-recrystallization area, and the effects of dislocations strengthening, precipitation strengthening and phase change strengthening in cooling after rolling are sufficiently realized by adopting different online cooling modes according to different performance requirements of the final steel plate; and the microstructure is controlled according to different performance requirements to obtain a proper complex-phase structure. According to the scheme, flexible control on performance is realized through the flexibility of the cooling technology by use of one component; the produced steel plate has uniform structure, low yield ratio, high plasticity and excellent low-temperature toughness; the steel plate does not need preheating before welding and heat treatment after welding; and the individualized needs of users are met by the flexibility of the production line.
Description
Technical field
What the present invention relates to is the technical field of the production method of quality plate, especially has the controlled cooling model method of the easy welding quality plate of the difference in functionality indexs such as high tough, low yield strength ratio, high-elongation.
Background technology
High-performance steel not only has higher intensity compared with traditional soft steel, and has better low-temperature flexibility, weldability and cold formability etc.Its Composition Design is on the basis of economic Clean Steel, with economical element nb, V, Ti, the alternative Mo such as B, the minimizing optimization design of the precious alloys such as Ni, in conjunction with advanced TMCP technology, by accurate controlled cooling model path to control phase transition process, the highly malleablized ability of the thin crystalline substance of abundant excavation and heterogeneous structure structure, realize high solderability, the batch supply of high strength steel, especially addition of low yield strength ratio, the its functional attributes such as high-elongation, comply with modern project machinery, coal mine machinery, the antagonism such as special car fatigure failure, the safety such as cold roll forming, the requirement of energy-conserving and environment-protective aspect.
But the addition of steel mill's precious alloy in high-performance steel actual production process is general higher at present, when producing more than 600MPa rank easy welding high-performance steel, the precious alloys such as certain Cr, Mo, Ni, Cu must be added both at home and abroad.Disclosed in State Intellectual Property Office, the application number of Jiangsu company limited of a Sha Gang iron and steel research institute application is 201010295925.5, the patent of " high-strength low-crack sensitive slab and manufacture method thereof " by name, the patent provides a kind of manufacture method of the yield strength 420MPa steel grade adopting controlled rolling+cooling control technology to produce, its weak point is that the armor plate strength rank produced is low, its speed of cooling, final cooling temperature subject range is narrow (9-12 DEG C/s, 470-580 DEG C), be difficult to the Flexible Production realizing being realized multifunctional performance index by the adjustment of subsequent technique with a kind of steel billet of composition, especially do not control affecting the cold temperature of opening of soft or hard phase volume per-cent in steel, do not realize the production of low yield strength ratio steel, containing expensive alloying elements Cu, Ni in the composition of steel, in actual production process, easily cause strand and steel plate crackle, its Composition Design or the main strengthening effect relying on alloying element, do not embody controlled cooling model and realizing the effect in performance flexibility target.
Disclosed in State Intellectual Property Office, the application number of Baoshan Iron & Steel Co., Ltd's application is 200410084699.0, the patent of " a kind of low yield strength ratio easy welding structure steel thick plate and production method thereof " by name, its weak point is that this patent have employed the Ni content up to 0.30-0.32%, and Si content reaches 1-1.5%, Composition Design system and this patent have obviously different, high Si content can make welding crack sensibility coefficient high simultaneously, deteriorated weldability.In addition, it is low yield strength ratio index by control realization to cooling stages, as how to control out for guarantee high-ductility plasticity index cold, end is cold, cooling rate cooling parameter is then not mentioned.
As can be seen from above-mentioned two technical schemes, mostly is in the prior art with the addition of too much alloying element, which not only improves cost, the quality improving steel is not had yet, have ignored again in modern TMCP technology simultaneously, rolling stock accelerated cooling process can play the effect controlling steel performance, and this is the deficiency existing for prior art.
Summary of the invention
Technical problem to be solved by this invention, be exactly for the deficiency existing for prior art, and a kind of technical scheme of controlled cooling model method of easy welding quality plate is provided, designed by the minimizing of alloy element, greatly reduce cost of alloy, reduce welding crack sensibility coefficient; By the control of cooling mode, play phase transformation highly malleablized maximum capacity, ensure that structure refinement is with heterogeneous reinforced with process means, produce that finished product thickness is 12-60mm, tensile strength is greater than 700MPa has the low-welding crack-sensitive High Strength Steel Plate of height tough or low yield strength ratio or high-elongation difference in functionality index.
This programme is achieved by the following technical measures: a kind of controlled cooling model method of easy welding quality plate, its chemical composition content per-cent is by weight C 0.05-0.09%, Si 0.1-0.25%, Mn 1.55-1.65%, Nb 0.025-0.035%, V 0.025-0.035%, Cr 0.20-0.30%, B 0.0008-0.0025%, Alt 0.020-0.045%, Ti 0.015-0.030%, all the other are iron and inevitable impurity, the steel billet that welding crack sensibility indices P cm value is less than 0.21%, the steel plate that final thickness is 12-60mm is rolled at Unhydrated cement, take on-line cooling pattern to obtain the steel plate of required mechanical property to described steel plate.
The steel plate cooling mode being suitable for high tough index request is, control the temperature that steel plate after controlled rolling carries out water-cooled at 800-760 DEG C, and be once cooled to 500-550 DEG C with the speed of cooling of 15-20 DEG C/s, then air cooling is to room temperature; What obtain is organized as granular bainite and a part of ferrite bainite, and plate property meets yield strength and is greater than 600MPa, and tensile strength is greater than 700MPa, and unit elongation is greater than 16%, and-40 DEG C of low-temperature impacts are greater than the high strength steel plate of the mechanical property requirements of 200J.
The steel plate cooling mode being suitable for low yield strength ratio index request is that after controlled rolling, steel plate treats coldly temperature in rollgang overhead, to be cooledly enters water-cooling system fast to during 700-650 DEG C, and be cooled to 400-450 DEG C with the cooling rate of 18-28 DEG C/s, then air cooling is to room temperature; The ferrite bainite of the polygonal ferrite+granular bainite being organized as 40-45%+a large amount of obtained, plate property meets yield tensile ratio and is less than 0.8, yield strength is greater than 530MPa, tensile strength is greater than 700MPa, unit elongation is greater than 16%, and-40 DEG C of low-temperature impacts are greater than the low yield strength ratio steel plate of the mechanical property requirements of 120J.
The steel plate cooling mode being suitable for high-elongation index request is that after controlled rolling, steel plate enters water-cooled region fast, opens cold temperature and controls be greater than 850 DEG C, then direct quenching cooling, cooling termination temperature is 300-400 DEG C, and tempering temperature is 520-600 DEG C, tempering time 1.5-2min/mm+10min; What obtain is organized as tempering bainite, and plate property meets unit elongation and is greater than 20%, and yield strength is greater than 650MPa, and tensile strength is greater than 700MPa, and-40 DEG C of low-temperature impacts are greater than the high-elongation steel plate of the mechanical property requirements of 150J.
In sum, this programme adopts minimizing Composition Design, valuable alloy is substituted for main principle with economy alloying element, make full use of the most cheap alloy " water ", reduce alloy addition, strengthen splitting the control of cold temperature, speed of cooling and cooling termination temperature, the effect of dislocations strengthening when giving full play to roller repairing, precipitation strength, phase transformation strengthening.Require to control microtexture according to different performance, obtain suitable heterogeneous structure, the steel grade of production has that homogeneous microstructure, yield tensile ratio are low, the feature of plasticity high and low temperature tenacity excellent.
The armor plate strength utilizing this programme to produce is high, mould, good toughness, yield tensile ratio is low, achieving before weldering need not preheating, postwelding need not thermal treatment, the quality plate thickness specification produced is 12 ~ 60mm, the tensile strength of steel reaches more than 700MPa level,-40 DEG C of low-temperature impact toughness reach more than 120J, the present invention is with low cost, welding crack sensibility index is low, Plate Welding performance is good, utilize a kind of steel of composition, the Flexible Production of producing several functions product can be realized, the modern TMCP technology of positive utilization, the product performance that cooling production line can realize are widened, growing engineering machinery can be met, special car, the industries such as Heavy Type Steel Structure are to the demand of specific function sheet material, as can be seen here, the present invention has outstanding substantive distinguishing features and significant progress, its beneficial effect implemented also is apparent.
Accompanying drawing explanation
Fig. 1 is the tissue of the high strength steel plate obtained.
Fig. 2 is the tissue of the low yield strength ratio steel plate obtained.
Fig. 3 is the tissue of the high-elongation steel plate obtained.
Embodiment
Below by example, the present invention is described in further detail:
First embodiment:
Be C 0.08% by chemical composition, the steel billet of Si 0.15%, Mn 1.63%, Nb 0.031%, V 0.029%, Cr 0.26%, B 0.0018%, Alt 0.035%, Ti 0.022%, low-welding crack-sensitive indices P cm=0.19% is rolled into 50mm thickness steel plate within the scope of 880-840 DEG C, it is as follows to roll rear on-line cooling technology controlling and process:
1) the steel plate cooling mode producing high tough index request is, after controlled rolling, steel plate enters the temperature of water-cooled is 790 DEG C, and be once cooled to 500 DEG C with the speed of cooling of 15 DEG C/s, then air cooling is to room temperature;
2) the steel plate cooling mode producing low yield strength ratio index request is that after controlled rolling, steel plate treats coldly temperature in rollgang overhead, and enter water-cooling system fast when being chilled to 680 DEG C, be cooled to 400 DEG C with the cooling rate of 25 DEG C/s, then air cooling is to room temperature;
3) the steel plate cooling mode producing high-elongation index request is that after controlled rolling, steel plate enters water-cooled region fast, and opening cold temperature is 860 DEG C, and then direct quenching cooling, cooling termination temperature is 350 DEG C, and tempering temperature is 530 DEG C, tempering time 90min.
The mechanical property of the steel plate obtained by above technique is as shown in table 1:
The mechanical property of the steel plate that table 1 the present invention first embodiment obtains
Second embodiment:
Be C 0.06% by chemical composition, the steel billet of Si 0.19%, Mn 1.55%, Nb 0.026%, V 0.027%, Cr 0.22%, B 0.0014%, Alt 0.028%, Ti 0.017%, low-welding crack-sensitive indices P cm=0.15% is rolled into 14mm thickness steel plate within the scope of 900-840 DEG C, it is as follows to roll rear on-line cooling technology controlling and process:
1) temperature that after controlled rolling, steel plate enters water-cooled is 775 DEG C, and be once cooled to 540 DEG C with the speed of cooling of 18 DEG C/s, then air cooling is to room temperature;
2) after controlled rolling, steel plate treats coldly temperature in rollgang overhead, enters water-cooling system fast when being chilled to 660 DEG C, and be cooled to 450 DEG C with the cooling rate of 20 DEG C/s, then air cooling is to room temperature;
3) after controlled rolling, steel plate enters water-cooled region fast, and opening cold temperature is 855 DEG C, and then direct quenching cooling, cooling termination temperature is 400 DEG C, and tempering temperature is 580 DEG C, tempering time 30min.
The mechanical property of the steel plate obtained by above technique is as shown in table 2:
The mechanical property of the steel plate that table 2 the present invention second embodiment obtains
The present invention is not limited in above-mentioned embodiment, the change that those of ordinary skill in the art make in essential scope of the present invention, remodeling, interpolation or replacement, also should belong to protection scope of the present invention.
Claims (1)
1. one kind is easily welded the controlled cooling model method of quality plate, its chemical composition content per-cent is by weight C 0.08%, Si 0.15%, Mn 1.63%, Nb 0.031%, V 0.029%, Cr 0.26%, B 0.0018%, Alt 0.035%, Ti 0.022%, all the other are iron and inevitable impurity, the steel billet that welding crack sensibility indices P cm value is less than 0.21%, the steel plate that final thickness is 12-60mm is rolled at Unhydrated cement, it is characterized in that: different according to the performance requriements of final steel plate, different on-line cooling patterns taked to described steel plate:
1) the steel plate cooling mode being suitable for low yield strength ratio index request is that after controlled rolling, steel plate treats coldly temperature in rollgang overhead, to be cooledly enters water-cooling system fast to during 700-650 DEG C, and be cooled to 400-450 DEG C with the cooling rate of 18-28 DEG C/s, then air cooling is to room temperature; The ferrite bainite of the polygonal ferrite+granular bainite being organized as 40-45%+a large amount of obtained, plate property meets yield tensile ratio and is less than 0.8, yield strength is greater than 530MPa, tensile strength is greater than 700MPa, unit elongation is greater than 16%, and-40 DEG C of low-temperature impacts are greater than the low yield strength ratio steel plate of the mechanical property requirements of 120J;
2) the steel plate cooling mode being suitable for high-elongation index request is that after controlled rolling, steel plate enters water-cooled region fast, opens cold temperature and controls be greater than 850 DEG C, then direct quenching cooling, cooling termination temperature is 300-400 DEG C, and tempering temperature is 520-600 DEG C, tempering time 1.5-2min/mm+10min; What obtain is organized as tempering bainite, and plate property meets unit elongation and is greater than 20%, and yield strength is greater than 650MPa, and tensile strength is greater than 700MPa, and-40 DEG C of low-temperature impacts are greater than the high-elongation steel plate of the mechanical property requirements of 150J.
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| CN103231155B (en) * | 2013-06-06 | 2015-03-25 | 济钢集团有限公司 | Easy-welding high-strength large-thickness steel plate preheating-free gas shielded welding process |
| CN103725973B (en) * | 2013-12-26 | 2015-09-30 | 秦皇岛首秦金属材料有限公司 | Low composition low Pcm value 800MPa level high-strength steel and production method thereof |
| CN105200329A (en) * | 2015-09-11 | 2015-12-30 | 武汉钢铁(集团)公司 | Tensile strength-700MPa level easy-to-weld low-internal-stress structural steel plate and manufacturing method thereof |
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| CN101849026A (en) * | 2009-01-15 | 2010-09-29 | 新日本制铁株式会社 | Steel for weld construction having excellent high-temperature strength and low-temperature toughness and process for producing the steel |
| CN101962733A (en) * | 2010-10-29 | 2011-02-02 | 北京科技大学 | Low-cost and high-toughness X80 pipe steel with high deformation resistance and manufacture method thereof |
| CN102191430A (en) * | 2010-03-19 | 2011-09-21 | 宝山钢铁股份有限公司 | Easy welding steel plate with yield strength of 550MPa and high toughness and manufacturing method thereof |
| CN102876997A (en) * | 2012-09-11 | 2013-01-16 | 舞阳钢铁有限责任公司 | Easy-welding tempering high-strength steel plate for ocean platform and production method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3374688B2 (en) * | 1996-12-24 | 2003-02-10 | 日本鋼管株式会社 | Method for producing tempered 600 N / mm2 class high strength steel excellent in weld cracking sensitivity and low-temperature toughness |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101849026A (en) * | 2009-01-15 | 2010-09-29 | 新日本制铁株式会社 | Steel for weld construction having excellent high-temperature strength and low-temperature toughness and process for producing the steel |
| CN102191430A (en) * | 2010-03-19 | 2011-09-21 | 宝山钢铁股份有限公司 | Easy welding steel plate with yield strength of 550MPa and high toughness and manufacturing method thereof |
| CN101962733A (en) * | 2010-10-29 | 2011-02-02 | 北京科技大学 | Low-cost and high-toughness X80 pipe steel with high deformation resistance and manufacture method thereof |
| CN102876997A (en) * | 2012-09-11 | 2013-01-16 | 舞阳钢铁有限责任公司 | Easy-welding tempering high-strength steel plate for ocean platform and production method thereof |
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