本发明公开了一种Cu析出增强型高强耐火耐蚀钢及其制造方法，属于建筑结构用钢技术领域，采用低C设计，采用Ni、Cu耐蚀元素合金化，耐火性主要通过室温贝氏体组织控制和遇火高温析出纳米Cu粒子共同保障。其组成为：C：0 .01～0 .03wt .％、Si：0 .10～0 .30wt .％、Mn：0 .10～0 .50wt .％、Ni：3 .00～5 .00wt .％、Cu：0 .80～1 .50wt .％、Ti：0 .010～0 .030wt .％、Al：0 .015～0 .035wt .％、P：<0 .015wt .％、S：<0 .010wt .％，其余为Fe和不可避免的杂质。制造方法采用转炉或电炉冶炼，铸造采用连铸或模铸。上述高强耐火耐蚀钢可用于钢结构建筑。

The invention discloses a Cu precipitation-enhanced high-strength fire-resistant and corrosion-resistant steel and its manufacturing method, which belongs to the technical field of steel for building structures. It adopts low-C design and alloying with Ni and Cu corrosion-resistant elements. The fire resistance is mainly guaranteed by the control of bainite structure at room temperature and the precipitation of nano-Cu particles at high temperature after fire. The composition is : C : 0.01 ~ 0.03 wt. %, Si : 0.10 ~ 0.30 wt. %, Mn : 0.10 ~ 0.50 wt. %, Ni : 3.00 ~ 5.00 wt. %, Cu : 0.80 ~ 1.50 wt. %, Ti : 0.010 ~ 0.030 wt. %, Al : 0.015 ~ 0.035 wt. %, P : < 0.015 wt. %, S : < 0.010 wt. %, the others are Fe and inevitable impurities. The manufacturing method is converter or electric furnace smelting, casting is continuous casting or mold casting. The above high-strength fire-resistant and corrosion-resistant steel can be used for steel structure buildings.