400mm特厚低合金结构钢Q345E的研发  

Development of low-alloy structural steel Q345E with thickness of 400mm

作　　者：唐郑磊 杨东 张涛 李红洋 徐昭 袁恒 

机构地区：[1]南阳汉冶特钢有限公司技术中心,河南南阳474500

出　　处：《钢铁研究》2012年第3期53-56,共4页Research on Iron and Steel

摘　　要：通过合理的钢种成分设计,模铸、钢锭加热和3 800mm轧机轧制及热处理工艺设计,采用晶粒细化、固溶强化、析出强化等手段,研发了厚度400mm的特厚板Q345E。钢板的屈服强度控制在305～350MPa,平均为335MPa;抗拉强度控制在470～555MPa,平均达到530MPa;伸长率控制在23%～28%,平均达到26%;-40℃纵向冲击功控制在109～287J,平均达到了198J,实现了强度和韧性的良好匹配,并具有较高的内部质量。Ultra-thick low-alloy structural steel Q345E with thickness of 400mm was developed by reasonable design in steel composition,mold casting and heating of billet,rolling and heating treatment processes of 3 800 mm rolling mill.Technological measures,such as grain refinement,solid solution strengthening,precipitation strengthening,etc.were adopted.As a result,its yield strength was 305-350 MPa（average 335 MPa）,the tensile strength reached 470-555 MPa（average 530 MPa）,the elongation rate was 23 %-28 %（average 26 %）,the impact power in longitudinal direction at-40 ℃ was 109-287 J（average 198 J）.The ultra-thick plate achieved a good match of strength and toughness and was good in internal quality.

关 键 词：成分设计 模铸 热处理 特厚板 低合金结构钢 

分 类 号：TG335.3[金属学及工艺—金属压力加工]