(鋼鐵研究總院，北京 100081)
摘 要: 通過(guò)大幅度降低鋼中碳含量， 利用銅的時(shí)效析出強(qiáng)化作用以及鈮的微合金化作用， 在碳含量小于0.06%（質(zhì)量分?jǐn)?shù)）時(shí)， 獲得了屈服強(qiáng)度高于600MPa、 -40℃時(shí)沖擊功超過(guò)250J、 可實(shí)現(xiàn)0℃不預(yù)熱焊接的高性能新型船體結(jié)構(gòu)鋼。 實(shí)驗(yàn)表明： 在鋼體中加入1%（質(zhì)量分?jǐn)?shù)）的銅可使其屈服強(qiáng)度增大270~350MPa。 該鋼的應(yīng)用可望大幅降低大型船體的建造成本， 代表了新一代船體鋼的發(fā)展方向。
關(guān)鍵字: 船體鋼; 銅; 時(shí)效硬化; 焊接性
CHAI Feng, ZHANG Yong-quan
（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
