Thin-gauge and high-strength hot-rolled steel strip for cold forming and production method of thin-gauge and high-strength hot-rolled steel strip

Abstract

The invention discloses a thin-gauge and high-strength hot-rolled steel strip for cold forming and a production method of the thin-gauge and high-strength hot-rolled steel strip. The steel strip comprises the chemical components in percentage by weight: 0.04-0.10% of C, 0.05-0.25% of Si, 1.0-1.5% of Mn, less than or equal to 0.010% of P, less than or equal to 0.008% of S, 0.03-0.07% of Nb, 0.08-0.20% of V, 0.10-0.20% of Ti, 0.05-0.20% of Mo, less than or equal to 40ppm of N, less than or equal to 50ppm of O and the balance of Fe and unavoidable impurities. The production method of the steel strip comprises the following steps: 1) element smelting; 2) continuous casting; 3) rolling; and 4) natural cooling of a hot-rolled steel coil after rolling. By using the thin-gauge and high-strength hot-rolled steel strip, the thin-gauge and high-strength hot-rolled steel strip for cold forming is stably produced in batches on the traditional hot rolling production line, and the comprehensive performances of steel are improved.

Description

technical field [0001] The invention relates to a hot-rolled steel strip, in particular to a thin-gauge, high-strength hot-rolled steel strip for cold forming and a production method thereof. Background technique [0002] At present, with the continuous improvement of energy saving, environmental protection and low-cost manufacturing requirements, the automobile and bus industry is gradually developing towards high strength, thinner and lighter weight. Traditional thick-gauge low-strength grade steel can no longer meet the structural design and manufacturing needs of new models. It is urgent to develop thin-gauge high-strength steel, which can reduce the weight of the body through strengthening thinning and structural optimization, shorten the vehicle manufacturing cycle and improve vehicle safety. [0003] In the past, in order to meet the demand of thin gauge and high strength, cold-rolled strip steel was often used to produce cold-formed steel. Although the strength and t...

AI Technical Summary

Problems solved by technology

[0005] Based on the traditional hot rolling production line, the production of thin-gauge high-strength cold-forming hot-rolled steel strips with a thickness of less than 3 mm faces many technical difficulties: 1) The contents of P, S, O, and N in molten steel must be controlled at a relatively low level. Low level, and to ensure the yield of titanium, very strict requirements on the smelting process; 2) to obtain the ideal ferrite and bai...

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