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.
参考文献
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