Hot-rolled pickling steel with high surface quality and tensile strength of 490 MPa and manufacturing method for hot-rolled pickling steel

Abstract

The invention discloses a hot-rolled pickling steel with a high surface quality and a tensile strength of 490 MPa and a manufacturing method. The weight percentages of its chemical components are: C: 0.060-0.080%, Si: 0.100-0.200%, : 1.000~1.250%, P≤0.020%, S≤0.008, Nb: 0.015~0.025%, Als: 0.015~0.040%, Cu≤0.300%, Ni≤0.300%, Cr≤0.300%; the rest is Fe and unavoidable impurity; the method is through hot metal desulfurization, converter smelting, vacuum treatment, continuous casting, shaping, slab heating, hot continuous rolling, laminar cooling, coiling, finishing, pickling process, levelling, coiling, recoiling, Manufactured by oiling and packaging, the hot-rolled pickled steel of the invention has the characteristics of good ductility, cold stamping performance, welding performance and good cold bending performance.

Description

technical field [0001] The invention relates to a manufacturing method of a steel plate, specifically a hot-rolled pickled steel with a high surface quality and a tensile strength of 490 MPa and a manufacturing method thereof. The steel plate is mainly used in body systems, chassis systems, and wheel systems of automobiles , some structural parts in the seat system and the inner panel of the cab, etc. Background technique [0002] As the overall overcapacity of the iron and steel industry continues to increase, low-cost manufactured products are increasingly valued by the iron and steel industry; on the other hand, the automobile industry is developing rapidly, the demand for automobile steel is increasing, and the competition in the industry is also increasing. is becoming more and more fierce, so the control of material cost is very important. The development status of the steel industry and the automobile industry has further promoted the application and development of h...

AI Technical Summary

Problems solved by technology

[0008] The first purpose of the present invention is to provide a hot-rolled pickled steel with high surface quality and tensile strength of 490MPa for the existing defects of hot-rolled pickled steel with a tensile strength of 490MPa. In the pickling state, This kind of steel plate has high surface quality, uniform and fine grain structure, good stamping performance and welding performance

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