High-corrosion resistant high-strength weather resisting steel and manufacturing method thereof

Abstract

The invention provides high-corrosion resistance and high-strength weather resistant steel which comprises the following chemical components (in weight percentage): 0.002 percent to 0.005 percent of C, 0.20 percent to 0.40 percent of Si, 0.01 percent to 0.05 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.008 percent of S, 0.01 percent to 0.05 percent of Al, 0.20 percent to 0.40 percent of Cu, 4.50 percent to 5.50 percent of Cr, less than or equal to 0.40 percent of Ni, 0.001 percent to 0.006 percent of Ca, 0.001 percent to 0.006 percent of N, less than or equal to 0.03 percent of Ti, and the rest are Fe and other inevitable impurities. The invention also provides a manufacturing method of the weather resistant steel. The yield strength of the weather resistant steel is more than 700MPa, the extensibility is more than 20 percent and the atmospheric corrosion resistance is higher than that of traditional high-strength weather resistant steel; in addition, the steel can be directly used in atmospheric environment without being coated, and meets the requirements of railway freight car, container and bridge building fields.

Description

technical field The invention belongs to the field of iron and steel materials, and more specifically, the invention relates to a high-corrosion-resistant high-strength weather-resistant steel and a manufacturing method thereof. The high-corrosion-resistant and high-strength weather-resistant steel is suitable for bare installation. Background technique So far, a number of invention patents have been declared for high-strength weather-resistant steel (or atmospheric corrosion-resistant steel) and its manufacturing methods at home and abroad. For example, domestically there are mainly: The patent application for "Low Temperature High Toughness Atmospheric Corrosion Resistant Steel with 600MPa Level and Its Manufacturing Method" (Patent Publication No. "CN1718832A") published in 2006 (see Table 1 for chemical composition); Chinese patent application for "an economical weathering steel" (patent publication number "CN1800428A"); The authorized Chinese patent of the patent ...

AI Technical Summary

Problems solved by technology

In recent years, the railway department has carried out a comprehensive investigation on the corrosion status of railway freight transport vehicles made of low-alloy weathering steel with the aforementioned composition system. Technical requirements

Studies have shown that the use of auxiliary microalloying elements cannot greatly improve the corrosion resistance of steel, and the use of stainless steel will greatly increase the cost of vehicle manufacturing

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