超大型液化气体运输船用36公斤级低温钢的研制

Research of Low Temperature Steel LT-FH36 for Very Large Gas Carrier

介绍了华菱湘钢对超大型液化气体运输船用36公斤级低温钢板的研制。结果表明,采用超低碳、Al-Nb-Ti多元微合金化成分设计加控轧控冷工艺研制的高强度LT-FH36船用低温钢板,其金相组织以细晶粒铁素体和细小的贝氏体为主,屈服强度在430 MPa以上,抗拉强度在520 MPa以上,屈强比小于0.87,伸长率大于25%,-60℃以下低温冲击吸收功均在200 J以上,能够很好的满足超大型液化气体运输船用低温钢板的使用需求。

This paper introduced the research of XISC produced low temperature steel LT-FH36 for very large gas carrier(VLGC).The results shows that the high strength and low temperature steel LT-FH36 developed by using the chemical design of super-low carbon,microalloying elements like Al-Nb-Ti and the technology of controlled rolling and controlled cooling(TMCP)can well meet the application requirements of low-temperature steel plates for VLGC.Its metallographic structure is mainly fine grain ferrite and fine bainite.The yield strength is more than 430 MPa,the tensile strength is more than 520 MPa,the yield ratio is less than 0.87,the elongation is more than 25%,and the low-temperature impact absorption energy below-60℃is more than 200 J.