A high-elongation high-strength hot-rolled pickled steel plate and its manufacturing method
A hot-rolled pickling, high-elongation technology, applied in the field of metal materials, can solve the problem of not meeting the requirements of high-strength and high-elongation hydroformed steel plates, and achieve high elongation, avoid band-like structure, and reduce the effect of load
Active Publication Date: 2019-03-22
ANGANG STEEL CO LTD
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Problems solved by technology
The elongation rate of the steel plate has reached 39%, but the highest tensile strength is 475MPa, which does not meet the requirements of high strength and high elongation hydroformed steel plate
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[0029] The technical problems involved in the present invention are solved by the following technical solutions: a high-elongation high-strength hot-rolled pickled steel plate and its manufacturing method, the mass percentage of its chemical composition is: C: 0.08% to 0.18%, Si≤0.10%, Mn : 0.8%~1.8%, Al: 0.02%~0.08%, Nb: 0~0.08%, V: 0~0.08%, and limit P<0.010%, S<0.005%, the rest is Fe and unavoidable impurities. Heat the continuous casting slab to 1160±20°C, keep it warm for 2 to 4 hours, use controlled rolling means, the rolling temperature in the recrystallization zone is greater than 1050°C, the thickness of the intermediate slab is 35-60mm, and the final rolling temperature in the non-recrystallization zone is 840-920°C, continuous cooling in the front section after final rolling, the cooling rate is 20-40°C / s, the coiling temperature is 550-650°C, and the thickness of the finished product is 2.5-6mm. After hot rolling, a continuous automatic pickling production line is ...
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Abstract
The invention discloses a high elongation and high strength hot rolling pickling steel plate and a manufacturing method thereof. Chemical components in steel include, by weight percentage, 0.08-0.18%of C, smaller than or equal to 0.10% of Si, 0.8-1.8% of Mn, 0.02-0.08% of Al, 0-0.08% of Nb, 0-0.08% of V, smaller than 0.010% of P, smaller than 0.005% of S and the balance Fe and inevitable impurities. Continuously cast blanks are heated to 1160+ / -20 DEG C, heat preserving is performed for 2-4 hours, controlled rolling is adopted, the rolling temperature of a recrystallization zone is larger than or equal to 1050 DEG C; the final rolling temperature of a non-recrystallization zone is 840-920 DEG C; laminar cooling is adopted after final rolling, the cooling speed is 20-40 DEG C / s; the coiling temperature is 550-650 DEG C; the thickness of a finished product is 2.5-6 mm; and after hot rolling, scale is cleaned with hydrochloric acid, the withdrawing-strengthening elongation range is 0.5%-1.3%. The produced steel plate has high elongation, and is mainly used for manufacturing automobile parts.
Description
technical field [0001] The invention belongs to the field of metal materials, and in particular relates to a high-elongation high-strength hot-rolled pickled steel plate and a manufacturing method thereof. The steel plate of the present invention is mainly suitable for manufacturing automobile parts. Background technique [0002] In recent years, with the development of the automobile industry, there has been an increasing demand for cost reduction through weight reduction of the vehicle body, integration of components, and rationalization of the processing process, and the development of high-strength hot-rolled steel sheets with excellent formability has been increasing. Large, especially for the forming of hot-rolled pickled steel sheets, elongation is very important. Especially when the advanced hydroforming process is used to produce auto parts, hot-rolled pickled sheets with high strength and good surface quality are required, and at the same time, they must have high...
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IPC IPC(8): C22C38/04C22C38/02C22C38/06C22C38/12C21D8/02C21D6/00
Inventor 时晓光董毅韩斌张宇孙成钱刘仁东杨军荣王越管成平张建军
Owner ANGANG STEEL CO LTD