Preparation method of thick-gauge hot-formed steel, hot-rolled steel plate and hot-formed steel
A technology for hot-formed steel and hot-rolled steel sheet, which is used in the preparation of thick-gauge hot-formed steel, hot-rolled steel sheet and hot-formed steel field. Unable to meet the requirements and other problems, to achieve the effect of reducing the sensitivity of hydrogen embrittlement, low cost, and simplifying the process flow
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Embodiment 1
[0034] To prepare 1700MPa-grade high Cr-Si alloyed coating-free thick-gauge hot-formed steel with a thickness of 5.0 mm, the process steps are as follows:
[0035] (1) Controlled rolling and controlled cooling treatment
[0036] The chemical composition of the alloy billet by mass percentage is: C: 0.18%, Mn: 3.2%, Si: 2.8%, S: 0.005%, P: 0.008%, Al: 0.01%, Cr: 1.8%, Nb: 0.05%, V: 0.01%, Ti: 0.01%, Cu: 0.15%, the balance is Fe and other unavoidable impurities; the continuous casting billet of the above components is heated to 1280 ° C with the furnace and kept for 2 hours; after descaling once, remove Furnace-generated iron scale, the rough rolling start temperature is 1170°C, after 6 rough rolling passes, the total reduction rate of the rough rolling is 81%, and the thickness of the intermediate billet is 43.79mm; the secondary oxide scale is removed before the finish rolling Afterwards, the steel strip with a thickness of 5.0mm was formed by 7 passes of finish rolling. The...
Embodiment 2
[0043] To prepare 1700MPa-grade high Cr-Si alloyed coating-free thick-gauge hot-formed steel with a thickness of 8.0mm, the process steps are as follows:
[0044] (1) Controlled rolling and controlled cooling treatment
[0045] The chemical composition of the alloy billet by mass percentage is: C: 0.35%, Mn: 1.0%, Si: 1.9%, S: 0.007%, P: 0.012%, Al: 0.05%, Cr: 3.2%, Nb: 0.03%, V: 0.05%, Ti: 0.02%, Cu: 0.05%, the balance is Fe and other unavoidable impurities; the continuous casting billet of the above components is heated to 1250°C with the furnace and kept for 1.5h; after one descaling, After removing the furnace-generated oxide scale, the starting temperature of the rough rolling is 1138°C. After 6 passes of rough rolling, the total reduction rate of the rough rolling is 78%, and the thickness of the intermediate billet is 50.92mm; the secondary oxidation is removed before the finish rolling. After the iron sheet, the 8.0mm thick steel strip is finished by 6 passes. The ro...
Embodiment 3
[0052] To prepare 1700MPa-grade high Cr-Si alloyed coating-free thick-gauge hot-formed steel with a thickness of 10.0 mm, the process steps are as follows:
[0053] (1) Controlled rolling and controlled cooling treatment
[0054] The chemical composition of the alloy billet by mass percentage is: C: 0.28%, Mn: 2.5%, Si: 1.2%, S: 0.004%, P: 0.007%, Al: 0.03%, Cr: 3.9%, Nb: 0.01%, V: 0.03%, Ti: 0.03%, Cu: 0.12%, the balance is Fe and other unavoidable impurities; the continuous casting billet of the above components is heated to 1234°C with the furnace and kept for 1h; after descaling once, remove Furnace-generated scale, the rough rolling start temperature is 1108°C, after 6 passes of rough rolling, the total reduction rate of the rough rolling is 77.86%, and the thickness of the intermediate billet is 51mm; after removing the secondary scale before finish rolling , after 6 passes of finish rolling into a 10.0mm thick steel strip, the reduction ratios of each pass of finish ro...
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