Quenched and tempered steel plate with yield strength being 420 MPa grade for building structure and production method of quenched and tempered steel plate
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A technology for yield strength and building structure, which is applied in the field of steel plates for quenched and tempered building structures, and can solve the problems that the yield strength is difficult to meet the standard requirements
Active Publication Date: 2021-06-18
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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[0008] The technical problem to be solved by the present invention is to provide a quenched and tempered steel plate for building structures with a yield strength of 420 MPa and its production method in view of the above-mentioned prior art, and to solve the problem that the yield strength of the normalizing heat-treated Q420GJ with a thickness of 50 mm to 100 mm is difficult to reach the standard asked questions
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example 1
[0025] Example 1: Adopt Q420GJC / D thick 370mm continuous casting blank according to the smelting chemical composition of the design of the present invention to produce an example of rolling 80mm thick steel plate. The continuous casting slab is 370×2120×3605mm, and the rolled finished plate is 80×2437×L (length) mm. The billet is cold loaded into the heating furnace. The temperature of the preheating section of the heating furnace is ≤900°C, the temperature of the first stage of heating is 1000-1180°C, the temperature of the second stage of heating: 1210-1250°C, the temperature of the soaking section: 1190-1250°C; the total heating time≥ 400 minutes. Rough rolling is rolled for 5 passes. After warming, the starting rolling temperature of the finish rolling mill is ≤875°C. The finish rolling is rolled for 7 passes, and the final rolling temperature is ≤850°C. Stacking slow cooling; the quality inspection of the steel plate after tempering at 690°C, the physical and chemical pe...
example 2
[0026] Example 2: Adopt Q420GJC / D thick 450mm continuous casting billet according to the smelting chemical composition of the design of the present invention, and produce an example of rolling 100mm thick steel plate. The continuous casting slab is 450×1920×4000mm, and the rolled finished plate is 100×2660×L (length) mm. The billet is cold loaded into the heating furnace. The temperature of the preheating section of the heating furnace is ≤900°C, the temperature of the first stage of heating is 1000-1180°C, the temperature of the second stage of heating: 1210-1250°C, the temperature of the soaking section: 1190-1250°C; the total heating time≥ 500 minutes. Rough rolling is rolled 8 times, after warming, the starting rolling temperature of the finishing mill is ≤870°C, the finishing rolling is rolled through 9 passes, and the final rolling temperature is ≤850°C; after rolling, it is directly water-cooled and quenched to 297°C before it is rolled off the production line Stacking...
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Abstract
The invention relates to a quenched and tempered steel plate with the yield strength being 420 MPa grade for a building structure and a production method of the quenched and tempered steel plate. The component design that Nb and Ti microalloying treatment is conducted on the basis of a Fe-Mn-C system is adopted, and the steel plate material is prepared from the chemical components including 0.13%-0.18% of C, 0.20%-0.50% of Si, 1.40%-1.70% of Mn, less than or equal to 0.015% of P, less than or equal to 0.005% of S, less than or equal to 0.30% of Cr, less than or equal to 0.30% of Mo, less than or equal to 0.30% of Ni, less than or equal to 0.30% of Cu, 0.020%-0.050% of Al, less than or equal to 0.015% of V, 0.025%-0.050% of Nb, 0.010%-0.020% of Ti, less than or equal to 0.006% of N and the balance Fe and inevitable impurity elements. The production process comprises the following steps that raw materials are smelted in a converter, refined outside the converter and refined in an RH furnace in sequence to obtain molten steel with higher purity, the molten steel is poured to form a steel billet being 370 mm-450 mm, then reasonable steel billet heating, rolling, on-line direct quenching and tempering heat treatment technologies are adopted, and the steel plate material with the yield strength being 420 MPa grade is suitable for large-scale steel structure constructional engineering such as high-rise buildings, large-span stadiums, airports, exhibition centers and industrial factory buildings is obtained.
Description
technical field [0001] The invention relates to a quenched and tempered steel plate for building structures with a yield strength of 420 MPa and a production method thereof. It belongs to the technical field of the metallurgical industry. Background technique [0002] With the rapid development of my country's economy, the selected steel plate materials for large-scale steel structure construction projects such as high-rise buildings, long-span stadiums, airports, exhibition centers and industrial plants are gradually upgraded to a yield strength of 420MPa or even higher. In GB / T 19879 standard for steel plates, the maximum thickness has been expanded to 200mm, and stricter material carbon equivalent Ceq, welding crack sensitivity coefficient Pcm control requirements have been added, and the yield strength thickness effect, yield ratio, elongation and Performance indicators such as minimum impact absorption energy put forward stricter requirements, and the production difficul...
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