(钢铁研究总院,北京 100081)
摘 要: 通过大幅度降低钢中碳含量, 利用铜的时效析出强化作用以及铌的微合金化作用, 在碳含量小于0.06%(质量分数)时, 获得了屈服强度高于600MPa、 -40℃时冲击功超过250J、 可实现0℃不预热焊接的高性能新型船体结构钢。 实验表明: 在钢体中加入1%(质量分数)的铜可使其屈服强度增大270~350MPa。 该钢的应用可望大幅降低大型船体的建造成本, 代表了新一代船体钢的发展方向。
关键字: 船体钢; 铜; 时效硬化; 焊接性
(General Iron and Steel Research Institute,
Beijing 100081, China)
Abstract:By decreasing carbon content, adding copper and microalloying with Nb, a new generation ship hull steel with high strength, excellent low-temperature toughness and good weldability was obtained. Age hardening is the most distinct character of the steel. Adding 1% copper into the steel can improve the yield strength by 270-350MPa due to the precipitation of fine dispersed ε-Cu particles in the matrix. Based on the research results, a new ship hull steel with yield strength of 600MPa and excellent low-temperature toughness was developed.
Key words: ship hull steel; copper; age-hardening; weldability