Abstract: By selecting Cu, Cr and Ni micro-alloying composition system and controlled rolling and cooling process of hot continuous rolling, finishing rolling temperature 845 ～875 ℃ and coiling temperature 585 ～615 ℃ , the mechanical properties of produce weather-resistant structural steel Q355NHC 8 mm strip ( /% ：0. 068C,0. 18Si, 1. 17Mn,0. 010P, 6. 006S,0. 35Cu,0. 21Ni,0. 49Cr ) are yield strength 463. 6 MPa, tensile strength of 552. 3MPa, elongation 28. 7% , and -20 ℃ V- type notch impact energy 251 ~256 J, and the other quality indexes meet the standard requirements.

摘要： 选用Cu、Cr、Ni微合金化成分体系,采用热连轧控轧控冷工艺,精轧终轧温度845～875℃,卷取温度585～615℃生产的8 mm耐候结构钢Q355NHC (/%:0.068C,0.18Si,1.17Mn,0.010P,0.006S,0.35Cu,0.21Ni,0.49Cr)带材力学性能为:屈服强度463.6 MPa,抗拉强度552.3 MPa,延伸率28.7%,-20℃V-型缺口冲击功251～256 J,各项质量指标均满足标准要求。

关键词: Q355NHC 耐候钢, 化学成分, 控轧控冷