By addition of Titanium (0.04%-0.12%), 450MPa-650MPa grade(YS) high strength steels with good weldability and impact roughness at lower temperature have been successfully developed by CSP process.是什么意思_By addition of Titanium (0.04%-0.12%), 450MPa-650MPa grade(YS) high strength steels with good weldability and impact roughness at lower temperature have been successfully developed by CSP process.在线翻译_英语_读音_用法_例句