Ultrathin hot-rolled sheet strip with yield strength more than or equal to 500MPa level and manufacturing method thereof

Abstract

An ultrathin hot-rolled sheet strip with yield strength more than or equal to 500MPa level comprises the chemical components by weight: 0.02-007%of C, less than or equal to 0.50% of Si, 0.50-1.40% of Mn, less than or equal to 0.030% of P, less than or equal to 0.010% of S, 0.03-0.11% of Ti, 0.01-0.20% of Als, less than or equal to 0.005% of N, less than or equal to 0.004% of O, or 0.17-0.20% of C, less than or equal to 0.50% of Si, 0.50-0.90% of Mn, less than or equal to 0.030% of P, less than or equal to 0.010% of S, 0.03-0.08% of Ti, 0.01-0.20% of Als, less than or equal to 0.005% of N, less than or equal to 0.004% of O. The process comprises melted iron desulfuration, converter blowing, argon blowing, LF furnace refining, continuous casting, rotary descaling, soaking pit soaking, descaling, seven-frame finish rolling, stream cooling and coiling. The ultrathin hot-rolled sheet strip has the advantages that the addition of the alloying element is low, the mechanical property is as follows: the yield strength is more than or equal to 500MPa, the product thickness is less than or equal to 1.4mm, the sheet shape is good, the production flow is short, and excellent cold forming and welding performances are achieved.

Description

technical field [0001] The present invention relates to a hot-rolled steel plate and a manufacturing method, in particular to an ultra-thin hot-rolled strip with a yield strength ≥ 500 MPa and a manufacturing method thereof, which is suitable for manufacturing trucks, special containers, and car parts, and the thickness specification does not exceed 1.4mm steel plate. Background technique [0002] With the development of the economy, the dependence on oil is becoming more and more serious, and the awareness of environmental protection is also increasing. Under this trend, many industries have the requirement of "replacing thickness with thinness" for structural parts, and at the same time hope to replace cold-rolled materials with relatively cheap hot-rolled materials "replacing cold with heat". Especially in the fields of trucks, special containers, car parts, etc., the demand for high-strength ultra-thin hot-rolled materials is increasing day by day. These users expect t...

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Problems solved by technology

This patent has 0.25~0.80% Cr added, which is costly, adopts cold rolling production process, prolongs the process, and has a low yield

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