Development of 490MPa Low Yield Ratio and Fire-Resistant Hot-Strip for Construction

摘要

Under a laboratory condition, 490MPa grade low yield ratio and fire-resistant hot-strip was developed by optimizing chemical compositions and rolling and cooling technology. The tested results indicate that its yield ratio is low ((σ_s)/(σ_b) < 0.8) and fire-resistant ability is strong ((σ_s(600℃))/(σ_s(RT))≥2/3). in addition, the relation of yield ratio and fire-resistant ability with the technological parameters is discussed.