Anti-shock, corrosion resisting and fire resisting steel and preparing method thereof

Abstract

The invention discloses anti-shock, corrosion resisting and fire resisting steel and a preparing method thereof, and belongs to the technical field of building structure steel. The problems that in the prior art, the anti-shock, corrosion resisting and fire resisting steel preparing technology is complex, and technology control difficulty is large are solved. The anti-shock, corrosion resisting and fire resisting steel comprises chemical components including, by mass percent, 0.06%-0.10% of C, 0.65%-1.00% of Si, 0.80%-1.20% of Mn, 0.50%-0.60% of Mo, 1.00%-1.50% of Ni, 0.72%-1.00% of Cr, 0.25%-0.40% of Cu, 0.01%-0.03% of Ti, 0.05%-0.10% of Nb, 0.03%-0.10% of V, 0.015%-0.055% of Al, smaller than 0.015% of P, smaller than 0.005% of S, smaller than 0.003% of O, smaller than 0.005% of N and thebalance Fe and inevitable impurities. The preparing method comprises smelting and casting and two-stage controlled rolling. The preparing method is simple and easy to control, and the comprehensive performance of the prepared anti-shock, corrosion resisting and fire resisting steel is good.

Description

technical field [0001] The invention belongs to the technical field of steel for building structures, and in particular relates to an anti-seismic, corrosion-resistant and fire-resistant steel and a preparation method thereof. Background technique [0002] It is technically difficult to meet the requirements of yield strength ≥ 690MPa, yield ratio ≤ 0.85, and elongation after fracture ≥ 18% at the same time for ultra-high-strength building structure steel. The technical solutions reported in the past usually use hot rolling direct quenching + two-phase critical Heat treatment process, hot rolling direct quenching to obtain martensite-based structure, heat treatment high temperature state to obtain nano second phase pre-precipitated enhanced high temperature tempered martensite and a certain amount of reverse transformed austenite, during the cooling process Part of the phase transformation of intermediate reverse transformation austenite forms high hardness bainite / martensit...

AI Technical Summary

Problems solved by technology

However, the critical heat treatment temperature window in the two-phase region is within 10-20 °C, and the process control is extremely difficult

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