310MPa-grade cold-rolled low-cost weathering steel for automobile and preparation method of 310MPa-grade cold-rolled low-cost weathering steel

Abstract

The invention relates to the field of steel smelting, and relates to production and manufacturing of cold-rolled weathering steel for automobiles, in particular to 310MPa-grade cold-rolled low-cost weathering steel for an automobile and a preparation method of the 310MPa-grade cold-rolled low-cost weathering steel. The weathering steel comprises the following chemical components in percentage by weight: 0 to 0.09 percent of C, 0.10 to 0.40 percent of Si, 0.20 to 0.50 percent of Mn, 0.05 to 0.12 percent of P, 0 to 0.015 percent of S, 0.010 to 0.030 percent of Al, 0.2 to 0.4 percent of Cu and the balance of Fe and inevitable impurities. According to the 310MPa-grade cold-rolled low-cost weathering steel for the automobile and the preparation method of the 310MPa-grade cold-rolled low-cost weathering steel, measures of controlling hot rolling in-furnace time, dephosphorization high-pressure water pressure, rough rolling temperature and the like are emphatically adopted, and the occurrence probability and degree of Cu brittleness and iron oxide scale are reduced. The steel has the advantages of being low in cost, excellent in surface quality, good in machining forming performance and atmospheric corrosion resistance and the like, and can be applied to industries such as automobiles and household appliances which have requirements for corrosion resistance.

Description

Technical field [0001] The present invention relates to the field of iron and steel smelting, automotive manufacturing cold rolled steel weathering, in particular to a cold rolling 310MPa grade automotive weathering steel at low cost and its preparation method. Background technique [0002] Atmospheric corrosion interaction of the material with its surrounding atmosphere, ordinary steel material is easily corrosion (rust) in the atmosphere. According to statistics, every year in the world's steel production has 1 / 6 loss due to corrosion, because of corrosion of steel per year caused direct economic losses of over 10 billion yuan. [0003] I.e. weathering steel atmospheric corrosion resistant steel, is added a small amount of alloy elements in the steel, the steel is formed so that a layer of rust is between about 50-100μm thick layer and the substrate with a dense matrix metal and good adhesion amorphous spinel oxide film, the presence of this layer is a dense oxide film, prevent...

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a low-cost weathering steel for 310MPa grade cold-rolled automobiles and its manufacturing method, so as to solve the problems of many additions and high cost of existing weathering steel alloys

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