160MPa earthquake-proof low yield strength steel, steel plate and manufacturing method thereof

Abstract

The invention provides earthquake-proof low yield strength steel and steel plate, characterized by containing the components in percentage by weight: at most 0.08 percent of C, at most 0.10 percent of Si, 0.1-1.2 percent of Mn, at most 0.015 percent of P, at most 0.010 percent of S, at most 0.05 percent of Al, at most 0.005 percent of N, at most 0.04 percent of Ti and the balance of Fe and unavoidable impurities. The invention also provides a manufacturing method of the steel plate, comprising the working procedures of heating steel billets, hot rolling and cooling after rolling. The steel isdesigned by adopting the component of low C-Si-Mn and being added with 0-0.04 percent of Ti, and has small fluctuation for the yield strength and excellent plastic deformation ability and 0-DEG C impact toughness. The invention adopts a processing technology of hot rolling at high temperature and air cooling or slowly cooling to the room temperature after hot rolling, has simple production process and lower cost, and is suitable for manufacturing earthquake-proof dampers for improving the earthquake resistance of buildings.

Description

Technical field [0001] The invention relates to the field of iron and steel materials, in particular, the invention relates to a low-yield strength steel for earthquake resistance. Background technique [0002] Prior to the present invention, there have been many invention patents on low-yield-point steel for earthquake resistance, such as the patent document JP2007146248 (low-yield-point thick steel plate with excellent low-temperature toughness and elongation and its manufacturing method) published in 2007, and published in 2004 Patent document JP2004339548 (225MPa / 235MPa grade low yield point steel with excellent toughness and its production method) and patent document JP2000256739 (low yield point thick plate for earthquake resistance) published in 2000, these patent documents disclose low yield strength, The low-alloy structural steel with high elongation can absorb seismic energy through the yield deformation of the plastic zone to achieve the purpose of earthquake resistan...

AI Technical Summary

Problems solved by technology

Among these added elements, such as Cu, Ni, Cr, Mo and Zr, etc. either increase the difficulty and cost of manufacturing, or are not conducive to the welding and low temperature impact properties of the steel plate

This steel grade does not provide the guarantee of low temperature impact performance, and pursues a high yield ratio (≥60%)

In addition, this patent document does not provide its specific production method

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