CN101343685A - Thermal treatment method for steel plate for high-strength construction with yield strength level of 420MPa - Google Patents
Thermal treatment method for steel plate for high-strength construction with yield strength level of 420MPa Download PDFInfo
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- CN101343685A CN101343685A CNA200810119504XA CN200810119504A CN101343685A CN 101343685 A CN101343685 A CN 101343685A CN A200810119504X A CNA200810119504X A CN A200810119504XA CN 200810119504 A CN200810119504 A CN 200810119504A CN 101343685 A CN101343685 A CN 101343685A
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Abstract
Disclosed is a thermal processing method for a high strength construction steel plate with 420MPa grade yield strength, which belongs to the technical field of low-alloy and high-strength construction steel. The steel comprises the following chemical components according to the weight percentage: 0.12 percent to 0.18 percent of Cr, 0.30 percent to 0.40 percent of Si, 1.40 percent to 1.50 percent of Mn, 0.03 percent to 0.05 percent of Nb, 0.05 percent to 0.1 percent of V, 0.01 percent to 0.02 percent of Ti, less than 0.015 percent of P, less than 0.005 percent of S, balance Fe and unavoidable impurities. The invention adopts the thermal processing process: a 45 mm thick steel plate is obtained after rolling and cold control processes are implemented on a continuous casting blank, the thick steel plate is heated to the normalizing temperature of 890 DEG C to 950 DEG C, and the temperature is decreased at a speed of 2 DEG C to 6 DEG C per second after heat insulation; the final cooling temperature is controlled within 600 DEG C to 750 DEG C; then the steel is straightened and air-cooled in a cooling bed. The invention can improve the structure of the fine steel plate and improve the strength of the steel plate through carrying out the normalizing cold control to the steel plate controlling rolling and cold, so the steel plate can meet the requirements of the national product standard, and can improve the qualified rate of the product.
Description
Technical field
The present invention relates to low-alloy high-strength construction(al)steel technical field, particularly relate to the heat treating method that a kind of yield strength is a 420MPa grade high-strength steel plate for building.
Background technology
In the normalizing heat treatment process, the C of steel plate Chang Yingang plate itself, factor such as the Mn element is on the low side cause intensity to be lower than GB, and make the steel plate degradation or change the original sentence to, and cause the enormous economic loss and the wasting of resources.
Though patent CN01129041.2 has introduced the normalizing cooling control technology effect of C-Mn steel, do not introduce the normalizing cooling control technology of high-strength steel of interpolation Nb, V, the Ti microalloy element of Q420GJ (being 420MPa grade high-strength steel plate for building) and so on; Domestic steel mill adopts the method for valuable alloying elements such as adding Cu, Ni to improve the yield strength of normalizing attitude steel plate more, to satisfy the intensity needs of high-strength steel, the present invention then need not add valuable alloying elements such as Cu, Ni, and especially concerning China, Cu, Ni, Mo are rare element, so just increased the cost of steel relatively, the adding of elements such as while Cu has also brought difficulty for the smelting and the continuous casting of steel.
Summary of the invention
The object of the present invention is to provide a kind of yield strength is the heat treating method of 420MPa grade high-strength steel plate for building, prepares the Q420GJ steel plate by adopting the cold and hot treatment process of positive fire control.By the steel plate behind the controlled rolling and controlled cooling being carried out the cold and hot processing of positive fire control, can refining grain size, improve the intensity of steel plate, improve product percent of pass.The development trend that has adapted to steel plate for building, on the basal component basis of Q420 structure iron, optimization design by chemical ingredients, the design thermal treatment process, make that the tensile strength of structure iron reaches 560～590MPa, yield strength 420～440MPa, yield tensile ratio＜0.75 after the present normalizing, unit elongation is 30～36%, and-60 ℃ of ballistic works reach 120J.
Realize that technical scheme of the present invention is: chemical ingredients is C:0.12-0.18% by weight percentage, Si:0.30-0.40%, Mn:1.40-1.50%, Nb:0.03-0.05%, V:0.05-0.1%, Ti:0.01-0.02%, P＜0.015%, S＜0.005%, all the other inevitably are mingled with for Fe reaches.Continuously cast bloom obtains the 45mm Plate Steel through behind the controlled rolling and controlled cooling, is heated to 890～950 ℃ of normalizing temperatures, is incubated 10～30 minutes, it is characterized in that the speed cooling of insulation back with 2～6 ℃/s; The control final cooling temperature is 600～750 ℃; Aligning; At the cold bed air cooling, finally obtain the high-performance building steel plate.
Continuously cast bloom chemical ingredients of the present invention is C, Si, Mn, P, S, Nb, V, Ti and Fe, and through smelting, and continuous casting becomes blank, blank heating to temperature is 1190～1210 ℃ after, carry out two stage controlled rolling and controlled coolings, carry out the cold and hot processing of normalizing control after rolling.
The above-mentioned high-performance building that obtains is thin ferrite crystal grain and a pearlitic structure more than 9 grades with the metallographic structure of steel plate; Its mechanical property tensile strength reaches 560～590MPa, and yield strength is at 420～440MPa, yield tensile ratio＜0.75, and unit elongation 30～36% ,-60 ℃ of ballistic works reach 120J, and steel grade has good welding property, its carbon equivalent ce %:0.42～0.46.
High-performance building of the present invention has following advantage and effect with steel plate compared to the prior art:
Since high-performance building of the present invention with the steel plate chemical composition design suitable proportioning, and the foundation of the controlled rolling thermal treatment process that adopts is: rolling by the controlled rolling of two stages, fully refinement and elongate austenite crystal; Obtain evenly tiny ferrite and pearlitic structure of comparison by the normalizing cooling control technology for heat treatment.Evenly tiny perlite has higher yield strength, advantages of higher tensile strength, and for the high-yield strength of control material, high-tensile provides strong assurance.The even tiny ferrite that contains in the tissue, can effectively reduce yield strength, reduce yield tensile ratio, the stress-strain(ed) curve of material when drawing process has tangible yield point elongation, improve work hardening capacity, make material when improving intensity, also have good formability, low-temperature impact toughness.
Perfect based on apolegamy rationally of the chemical ingredients of foregoing invention structure and processing condition makes high-performance building of the present invention all reach the standard of reservation with the over-all properties of steel:
High-strength building steel of the present invention adopts alloy system cheaply, and yield strength reaches 420MPa, has good comprehensive mechanical property, and welding property is good, increases substantially plate property and product percent of pass, has vast potential for future development.
Description of drawings
Fig. 1 is that yield strength of the present invention is the metallographic structure photo of 420MPa grade high-strength steel plate for building.
Embodiment
Chemical ingredients, heat treatment process parameter and mechanical property situation see Table 1～3 respectively.
Table 1 chemical ingredients (wt%)
Table 2 heat treatment process parameter
Table 3 mechanical property
Claims (4)
1, a kind of yield strength is the heat treating method of 420MPa grade high-strength steel plate for building, it is characterized in that, continuously cast bloom obtains the 45mm Plate Steel through behind the controlled rolling and controlled cooling, be heated to 890～950 ℃ of the temperature of normalizing, be incubated 10～30 minutes, the insulation back is with the speed cooling of 2～6 ℃/s, and final cooling temperature is 600～750 ℃; Aligning; At the cold bed air cooling, obtain the high-performance building steel plate.
2, in accordance with the method for claim 1, it is characterized in that, described steel plate chemical ingredients is C:0.12-0.18% by weight percentage, Si:0.30-0.40%, Mn:1.40-1.50%, Nb:0.03-0.05%, V:0.05-0.1%, Ti:0.01-0.02%, P＜0.015%, S＜0.005%, all the other inevitably are mingled with for Fe reaches.
3, in accordance with the method for claim 1, it is characterized in that, described continuous casting steel billet is to be raw material with chemical ingredients C, Si, Mn, P, S, Nb, V, Ti and Fe, through smelting, and continuous casting becomes blank, after blank heating to temperature is 1190～1210 ℃, carry out two stage controlled rolling and controlled coolings, carry out the cold and hot processing of normalizing control after rolling.
4, require 1 described method according to patent, it is characterized in that, described high-performance building is a ferrite close grain more than 9 grades with the metallographic structure of steel plate, and other are pearlitic structure; Its tensile strength reaches 560～590MPa, and yield strength is at 420～440MPa, yield tensile ratio＜0.75, and unit elongation 30～36% ,-60 ℃ of ballistic works reach 120J, and steel plate has good welding property, carbon equivalent ce %:0.42～0.46.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200810119504XA CN101343685B (en) | 2008-09-02 | 2008-09-02 | Thermal treatment method for steel plate for high-strength construction with yield strength level of 420MPa |
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| CN200810119504XA CN101343685B (en) | 2008-09-02 | 2008-09-02 | Thermal treatment method for steel plate for high-strength construction with yield strength level of 420MPa |
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| CN101343685A true CN101343685A (en) | 2009-01-14 |
| CN101343685B CN101343685B (en) | 2010-09-22 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101613828B (en) * | 2009-07-16 | 2011-05-18 | 首钢总公司 | Super-thick steel plate for low yield ratio buildings with 460 MPa grade yield strength and manufacturing method |
| CN112553519A (en) * | 2020-11-13 | 2021-03-26 | 柳州钢铁股份有限公司 | Manufacturing method of Q420GJ medium steel plate for low-yield-ratio, low-cost and high-performance building structure |
-
2008
- 2008-09-02 CN CN200810119504XA patent/CN101343685B/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101613828B (en) * | 2009-07-16 | 2011-05-18 | 首钢总公司 | Super-thick steel plate for low yield ratio buildings with 460 MPa grade yield strength and manufacturing method |
| CN112553519A (en) * | 2020-11-13 | 2021-03-26 | 柳州钢铁股份有限公司 | Manufacturing method of Q420GJ medium steel plate for low-yield-ratio, low-cost and high-performance building structure |
| CN112553519B (en) * | 2020-11-13 | 2021-12-10 | 柳州钢铁股份有限公司 | Manufacturing method of Q420GJ medium steel plate for low-yield-ratio, low-cost and high-performance building structure |
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| CN101343685B (en) | 2010-09-22 |
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Address after: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Co-patentee after: Qinhuangdao Shouqin Metal Material Co., Ltd. Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Co-patentee before: Qinhuangdao Shouqin Metal Material Co., Ltd. Patentee before: Capital Iron & Steel General Company |
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Effective date of registration: 20190410 Address after: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Co-patentee before: Qinhuangdao Shouqin Metal Material Co., Ltd. Patentee before: Shougang Group Co. Ltd. |