Cr-contained weathering steel with excellent toughness and high corrosion resistance

Abstract

The invention relates to a Cr-contained weathering steel with high corrosion resistance and a manufacture method thereof. The weathering steel is prepared from the following components in percentage by weight: 0.01-0.06 percent of C, 0.1-0.4 percent of Si, 0.2-0.8 percent of Mn, not more than 0.01 percent of P, not more than 0.006 percent of S, 0.2-0.5 percent of Cu, 2.5-7.0 percent of Cr, 0.2-1.2 percent of Ni, 0.01-0.05 percent of Al, not more than 0.005 percent of N, 0.01-0.10 percent of Ti and the balance of Fe and inevitable impurities. The relative corrosion rate of the weathering steel is decreased twice on the basis of traditional weathering steel and can be served in atmosphere environment; the preferred weathering steel has the yield strength over 460 MPa and excellent toughness, meets the requirement of steel for railway vehicles and achieves the aims of prolonging service length and decreasing maintenance cost.

Description

technical field [0001] The invention belongs to the field of low-alloy steel manufacture, and relates to a high-corrosion-resistant Cr-containing weathering steel and a manufacturing method thereof. Background technique [0002] Weathering steel, or atmospheric corrosion resistant steel. Under atmospheric service conditions, the alloy elements in the steel interact with each other, and a dense rust layer with α-FeOOH as the main component is formed on the surface, which is thermodynamically stable and does not participate in the cathodic reduction process of steel electrochemical corrosion. The enrichment of copper, chromium and other elements in the rust layer makes the rust layer have ion-selective permeation characteristics, thereby significantly improving the atmospheric corrosion resistance of weathering steel. Due to its high corrosion resistance, weathering steel is widely used in railway vehicle manufacturing industry, container manufacturing industry, bridge engine...

AI Technical Summary

Problems solved by technology

The addition of these elements, on the one hand, increases the manufacturing cost and difficulty, on the other hand, it is unfavorable to the welding and toughness of the steel plate

[0006] It can be seen that the weathering steel in the prior art can not fully meet the current use and manufacturing requirements, and it is necessary to develop a weathering steel with high corrosion resistance, especially a weathering steel with high strength and economical production

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