Weathering-resistant steel for high-strength low-yield-strength-ratio weathering-resistant carriage and preparation method thereof

Abstract

The invention discloses weathering-resistant steel for a high-strength low-yield-strength-ratio weathering-resistant carriage. The weathering-resistant steel comprises the following chemical components of, by mass, 0.10%-0.12% of C, 0.30%-0.50% of Si, 0.30%-0.50% of Mn, less than or equal to 0.015% of P, less than or equal to 0.005% of S, less than or equal to 0.050% of Al, 0.26%-0.36% of Cu, 0.50%-0.60% of Cr, 0.15%-0.25% of Ni, less than or equal to 50 ppm of N and the balance Fe and inevitable inclusions, wherein the mass fraction is 100% in total. The invention also discloses a preparationmethod of the weathering-resistant steel for the high-strength low-yield-strength-ratio weathering-resistant carriage. According to the weathering-resistant steel for the high-strength low-yield-strength-ratio weathering-resistant carriage and the preparation method thereof, the chemical components and the production process of the product are adjusted, and a heat preservation cover in a storehouse is adopted for slow cooling, so that unqualified products caused by the fact that no slow cooling facility exist in the finished product warehouse can be effectively eliminated.

Description

technical field [0001] The invention relates to a weather-resistant steel (Q345NQR2) for high-strength and low-yield-ratio weather-resistant carriages and a preparation method thereof. Background technique [0002] Since the product outline is positioned at the production of cold-rolled automotive steel products, hot-rolled products that require slow cooling were not considered in the hot-rolled finished product warehouse, and no slow-cooling pit was built during construction, and no site space for the slow-cooling pit was reserved. The market demand for railway carriage products is very large. In order to meet the needs of local customers and surrounding customers, our factory aims at the production of this hot-rolled product, from the chemical composition, hot rolling controlled rolling production process, controlled cooling production process, slow cooling process in the warehouse In-depth research has been carried out, and it is an urgent problem to be solved to develop ...

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Problems solved by technology

[0002] Since the product outline is positioned at the production of cold-rolled automotive steel products, hot-rolled products that require slow cooling were not considered in the hot-rolled finished product warehouse, and no slow-cooling pit was built during construction, and no space was reserved for the construction of slow-cooling pits

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