姜颖, 徐华, 黄微涛, et al. Research and Development of Q420qE Steel Plate with High Toughness by 210 t BOF-LF-RH-300 nun Slab CC Flow Sheet[J]. Special Steel, 2021, 42(2): 35-37.
姜颖, 徐华, 黄微涛, et al. Research and Development of Q420qE Steel Plate with High Toughness by 210 t BOF-LF-RH-300 nun Slab CC Flow Sheet[J]. Special Steel, 2021, 42(2): 35-37.DOI:
确保300 mm×2010 mm铸坯质量良好。利用TMCP(thermomechanical control process)轧制工艺
轧后堆垛缓冷
研发Q420qE钢18~26 mm板的屈服强度446~580 MPa
抗拉强度577~727 MPa
伸长率19.0%~28.5%
-40℃冲击吸收功129~287 J
各项性能指标均符合国标要求。
Abstract
In order to meet the tensile strength Rm≥540 MPa and -40℃ V type impact energy ≥ 120 J requirements on Q420qE steel plate for bridge structure
the design with 0.05 〜0.11C and Nb-Ti microalloying is adopted. The deep desulfiirization mode
LF + RH refining and electromagnetic stirring etc processes are used to ensure the good quality of 300 mm x2010 mm cast slab by using TMCP (thermomechanical control process) technology and rolled plate stacked cooling
of developed Q420qE steel 18-26 mm plate
the yield strength is 446 -580 MPa
the tensile strength is 577 ~ 727 MPa
the elongation is 19.0% ~28.5%
and the impact absorption work at -40℃ is 129 - 287 J to meet the requirements of national standards