Thin weathering steel with tensile strength of not less than 800 MPa produced by short process, and method

Abstract

The invention discloses a thin weathering steel with tensile strength of not less than 800 MPa produced by a short process. The thin weathering steel is prepared from the following components in percentage by weight: 0.04 to 0.09 percent of C, 0.20 to 0.40 percent of Si, 1.45 to 1.75 percent of Mn, 0.05 to 0.30 percent of Cu, 0.35 to 0.50 percent of Cr, 0.02 to 0.05 percent of V, 0.11 to 0.14 percent of Ti, 0.010 to 0.050 percent of Als, not more than 0.020 percent of P, not more than 0.006 percent of S, and not more than 0.006 percent of N. A production method comprises: performing continuouscasting into a thin slab after conventional smelting; soaking the thin slab; performing scale removal for two times; performing finishing rolling for seven times; performing laminar cooling to a coiling temperature; coiling; leveling. According to the invention, the full-length thickness of strip steel is uniform, the plate shape and the roll shape are excellent, the rolling process is stable, the finished product rate of an original variety is increased to 92 percent or more, the purpose of replacing a cold-rolled product in batches is achieved, and the demand for the light weight of a container is met.

Description

technical field [0001] The invention relates to steel for containers and a production method, specifically belonging to steel for containers with a tensile strength ≥ 800 MPa and a production method thereof, and specifically to weathering steel with a tensile strength ≥ 800 MPa and a thin specification produced by a short process. Background technique [0002] Weathering steel is widely used in the manufacture of railway transport containers. The weathering steel currently used is mainly SPA-H, with a yield strength level of 350MPa, and the use of high-strength weathering steel with a tensile strength ≥ 800MPa can reduce the amount of steel by more than 12% and reduce the number of containers. The manufacturing cost is more than 5%. On the other hand, it can bring considerable economic benefits to steel mills, and the profit per ton of steel can reach more than 1,200 yuan. Therefore, the development and application of high-strength weathering steel will produce significant ...

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Problems solved by technology

[0006] The present invention aims to overcome the disadvantages of the prior art that the thickness of the head of the strip steel is relatively thin, the shape of the plate and coil is bad, and the rolling process is unstable, resulting in the yield of the original variety not exceeding 83%, and provides a strip steel with a full-length thickness Thin-gauge weathering steel with a tensile strength ≥ 800 MPa produced by a short process and a method thereof that are uniform, have excellent plate shape and coil shape, and have a stable rolling process, increasing the yield of the original variety to more than 92%

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