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 (sigma_s/sigma_b < 0.8) and fire-resistant ability is strong (sigma_s(600 deg C)/sigma_b(RT) > = 2/3). In addition, the relation of yield ratio and fire-resistant ability with the technological parameters is discussed.