A kind of hot-rolled pickling dual-phase steel for high-strength automobile wheel and production method thereof

Abstract

The invention discloses a hot-rolled pickling dual-phase steel for high-strength automobile wheels and a production method thereof. Steel contains C: 0.060%~0.090%, Si: 0.010%~0.090%, Mn: 1.10%~1.49%, P: 0.020%~0.040%, S≤0.003%, Als: 0.41%~0.59%, rare earth elements La+Ce: 0.020% to 0.040%, the rest is Fe and unavoidable impurities. The cast slab is heated to 1180-1200°C and held for 1-2 hours; the reduction rate in the finish rolling zone is >92%, the finish rolling temperature is 760-820°C, the constant rolling speed is 3.5-4.5m / s; laminar flow cooling Cooling rate 8~10℃ / s, super fast cooling after 640~660℃, super fast cooling rate>100℃ / s, cooling the steel plate to ≤150℃, coiling and air cooling to room temperature; after cooling the steel plate to room temperature Perform pickling. The tensile strength of the steel plate is 690-730 MPa, the yield ratio is 0.55-0.59, and the elongation rate is ≥27.0%.

Description

technical field [0001] The invention belongs to the technical field of steel rolling, and in particular relates to a hot-rolled pickled dual-phase steel plate for high-strength automobile wheels and a production method thereof. The hot-rolled pickled dual-phase steel plate of the invention is mainly suitable for manufacturing high-strength automobile wheels with complex shapes and high surface quality requirements. Background technique [0002] With the development of the automobile industry, the manufacturing methods and processes of auto parts have been greatly improved, and the requirements for steel materials have become more stringent. As an important part of automobiles, the production process of automobile wheels has also been greatly improved, which has prompted them to put forward more personalized requirements for the steel materials used. For example, high-tech wheel products such as high-ventilation wheels require not only steel It has good mechanical performanc...

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Problems solved by technology

The content of Si in the patent composition is high, the surface quality of the steel plate does not meet the requirements of high-end wheel steel, and the high content of Cr element in the steel plate leads to high cost. At the same time, the finished steel plate is a hot-rolled product instead of a hot-rolled pickled product

[0004] Publication No. CN108467996A proposes a ferrite / martensitic hot-rolled dual-phase steel for wheel spokes and its manufacturing method. The steel plate adopts the C-Si-Mn-Cr-Mo composition system, wherein the Si content is 0.4% to 0.6%, Cr content is 0.30% to 0.40%, Mo content is 0.1% to 0.2%, the continuous casting slab is heated, rolled, cooled, pickled, oiled, and finally 600MPa grade hot rolled acid Washed dual-phase steel plate, the hot-rolled pickled dual-phase steel proposed in this patent contains a large amount of Si, Cr, and Mn elements, the product cost is relatively high, and the surface quality does not meet the requirements of high-end wheel steel, and it is not clearly stated in the production process Pickling process scheme

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