高性能耐火耐候建筑用钢WGJ510C2的研制及应用

INVESTIGATION OF HIGH PROPERTIES FIRE-RESISTANT AND WEATHERING CONSTRUCTION STEEL WGJ510C2 AND ITS TYPICAL USE

对武汉钢铁(集团)公司(以下简称武钢)研制的高性能耐火耐候建筑用钢WGJ510C2的力学性能、焊接性能、耐火性能、耐候性能及其典型应用进行了研究。试验结果表明:该钢具有优良的综合力学性能,在600℃温度下的屈服强度均高于其室温下屈服强度的2/3,完全满足建筑结构用钢耐火安全性的强度许用指标;具有低的焊接冷裂纹敏感性,能承受大线能量(50～100kJ/cm)焊接;裸钢的耐火极限比Q235钢高出44%左右,在考虑建筑设计一级防火标准时,使用该钢可比使用Q235钢节省薄型防火涂料36.5%～50%,节省厚型防火涂料26%;经过1800h加速循环腐蚀以后,该钢的腐蚀率与Q235钢和Q345钢相比分别减少20%和29%;经过武汉10个月大气曝晒试验的结果也表明,该钢的耐候性能也明显优于Q235钢和Q345钢。该钢在大型建筑应用中的实际效果良好。

The mechanical performance, weldability, fire-resistant, weathering performance and usage of high properties fire-resistant and weathering construction steel developed in Wuhan Steel were evaluated in this paper. It shows that this steel has fine integrated mechanical performance and that the yield strength of the steel at 600℃ is more than 2/3 of the yield strength at room temperature, which is suitable for the fire-resistant safety of constructions. The steel has low cold-cracking sensitivity and can bear high heat input (50～100kJ/cm). The endurance of naked WGJ510C2 is about 44% higher than that of Q235. Considering the fire protection standard Grade One in construction, WGJ510C2 can save 36.5%～50% thin protection coat and 26% thick protection coat, compared with Q235. The result from comparing different steel samples in cyclic corrosion test (CCT) in room and exposed experiment outside (Wuhan, ten months) shows that corrosion speed of new steel (WGJ510C2) is obviously slower than that of traditional construction steel such as Q235 and Q345. The practical use in huge constructions is excellent.