A kind of anti-seismic and weather-resistant hot-rolled h-shaped steel for coating-free steel structure and preparation method thereof

Abstract

The invention discloses a kind of shock-resistant and weather-proof hot rolled H-steel for a coating-free steel structure and a preparation method thereof. Chemical components of the hot rolled H-steel comprise, by weight, 0.11%-0.15% of C, 0.15%-0.26% of Si, 0.79%-1.25% of Mn, less than or equal to 0.025% of P, less than or equal to 0.025% of S, 0.25%-0.34% of Cu, 0.42%-0.57% of Cr, 0.16%-0.29% of Ni, 0.018%-0.040% of Nb, less than or equal to 0.10% of Mo, and the balance iron and trace impurities. According to the shock-resistant and weather-proof hot rolled H-steel, the requirement for corrosion resistance can be met by adding Cu, Ni and Cr elements; the requirement for the shock resistance can be met by adding Mo and Nb combined with the hot rolling process, and production of the weather-proof hot rolled H-steel for the coating-free steel structure is realized. The weather-proof hot rolled H-steel provided by the invention is good in mechanical performance. The strength yield ratiois greater than or equal to 1.20, the elongation rate is 30.5-32.5%, the atmospheric corrosion resistant index I is greater than or equal to 6.0, and the weather-proof hot rolled H-steel can be usedin a coating-free mode. Through the preparation method provided by the invention, there is no need to conduct online and after-rolling heat treatment during product production. Thus, the production procedures are fewer, and the production cost is lower.

Description

technical field [0001] The invention relates to metallurgical technology, in particular to an anti-seismic and weather-resistant hot-rolled H-shaped steel for a coating-free steel structure and a preparation method thereof. Background technique [0002] In the steel structure industry, the key development areas involve construction steel structures, bridge steel structures, energy steel structures, military steel structures, etc. It is estimated that by 2020, the national steel structure consumption will double that of 2016, reaching 80 million tons~ billion tons; the export volume of steel structures has quadrupled compared with 2016, reaching 10 million tons, and the future market prospect is very broad. In terms of steel structure, there is a small amount of research and development and use of high-performance steel in my country, especially steel with both earthquake resistance and weather resistance, which is far behind the status quo of popularization and application o...

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Problems solved by technology

Chinese patent CN109252092A "A Coating-Free Weathering Steel Containing Rare Earth Elements and Its Preparation Method" discloses a preparation method of a coating-free weathering steel, which has excellent mechanical properties, atmospheric corrosion resistance and welding performance, but contains Rare earth elements, high cost, low carbon content, difficult smelting, and controlled rolling and controlled cooling + tempering treatment, the process is more complicated

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