Manufacturing method of q420gj medium-thick steel plate for low-yield ratio, low-cost and high-performance building structure

Abstract

The invention provides a manufacturing method for low -flexed and low -cost high -performance building structures in Q420GJ.It is C: 0.14WT % ~ 0.17WT %, SI: 0.20WT % ~ 0.40WT %, Mn: 1.4WT % to 1.6WT %, P: ≤0.020WT %, S: ≤0.01wt %, Alt: 0.020 % ~0.050WT %, nb: 0.040WT % ~ 0.055WT %, V: 0.025WT % ~ 0.040WT %, TI: 0.015WT % ~ 0.030WT %, CEV: ≤0.44WT %, the balance is Fe and inevitable trace trace.Elements; Qu Qiang ratio 0.72‑0.78.The present invention can obtain Q420GJ with low flexion and high -cost qualified high -performance building structure.

Description

Technical field [0001] The present invention relates to the field of metallurgy, particularly to iron and steel manufacturing, in particular a low yield ratio high-performance low-cost method of manufacturing a building structure in a steel plate Q420GJ. Background technique [0002] Seismic steel building is the core issue of concern, and shock resistance and yield ratio of steel and is closely related. Yield ratio refers to the ratio of the yield strength and tensile strength of steel, which is an important index coefficient is a measure of the strength of the steel stock. Flexion strength steel material is relatively high, indicating a strong resistance to deformation of the materials, plastic deformation under external force hardly occurs, but the material is poor resistance to external shocks, the risk of brittle fracture is large, the reliability of the material low. Therefore, low yield ratio steel building structures is the seismic performance materials, safety and reliab...

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Problems solved by technology

[0005] The invention provides a method for manufacturing Q420GJ medium-thick steel plates for low-yield-ratio low-cost high-performance building structures to solve the problem of high yield ratio of Q420GJ medium-thick steel plates

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