Multi-precipitation enhancement type anti-seismic corrosion resistance and fire resistance H-shaped steel and preparation method thereof

Abstract

The invention discloses multi-precipitation enhancement type anti-seismic corrosion resistance and fire resistance H-shaped steel and a preparation method thereof. The steel is prepared from the chemical components in percentage by weight: 0.04% to 0.07% of C, 0.15% to 0.30% of Si, 1.1% to 1.6% of Mn, 0.3% to 0.6% of Cr, 0.06% to 0.12% of Ti, 0.1% to 0.2% of Mo, 0.80% to 1.20% of Ni, 0.80% to 1.20% of Cu, 0.01% to 0.03% of Al, less than or equal to 0.008% of P, less than or equal to 0.004% of S, and the balance of Fe and unavoidable impurities. Conventional vacuum smelting is adopted and pouring is carried out to form blank, the casting blank is heated, and rolled into the H-shaped steel through a recrystallization zone, the steel is subjected to air cooling to an indoor temperature, and adouble-phase structure of ferrite and bainite can be obtained. Through interphase precipitation generated by air cooling after rolling and a large amount of Cu precipitation generated by the encountering of fire, the fire resistance property can be improved. The designed multi-precipitation enhancement type anti-seismic corrosion resistance and fire resistance H-shaped steel has the advantages that the alloying cost is lowered, a preparation technology is simple and the mechanical property is excellent, and the steel can be widely applied to the building H-shaped steel meeting the requirements of anti-seismic corrosion resistance and fire resistance simultaneously.

Description

technical field [0001] The invention belongs to the technical field of steel for building structures, and in particular relates to a multi-precipitation enhanced anti-seismic, corrosion-resistant and refractory H-shaped steel and a preparation method thereof. Background technique [0002] Low-alloy high-strength structural steel has good performance and is widely used in bridges, ships, boilers, vehicles and important building structures. As one of the main application channels of low-alloy high-strength structural steel, construction steel has high application requirements, but the fire resistance of steel structure buildings is worse than that of brick structures and reinforced concrete structures. Generally, refractory coating is used to protect the steel, but this increases the construction cost, endangers human health and causes environmental pollution. Therefore, improving the fire resistance of steel itself is the most effective way to reduce fire protection coatings...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a multi-precipitation enhanced anti-seismic, corrosion-resistant and refractory H-shaped steel and its preparation for the problems of special H-shaped steel production process requirements and difficult coupling of shock-resistant, corrosion-resistant and fire-resistant properties. method

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