公开(公告)号：EP3309276A1

公开(公告)日：2018-04-18

申请号：EP16900185.6

申请日：2016-10-19

申请人： Jiangyin Xingcheng Special Steel Works Co., Ltd

发明人： SUN, Xianjin ,  GAO, Zhuzhong ,  HU, Jianguo ,  LI, Jingtao ,  MIAO, Pifeng ,  WU, Xiaolin ,  SHI, Ailai ,  ZHAO, Fu ,  XU, Feng ,  FANG, Shouyu

IPC分类号： C22C38/04 ,  C22C38/02 ,  C22C38/06 ,  C22C38/12 ,  C22C38/18 ,  C22C38/08 ,  C22C38/16 ,  C22C38/14 ,  C21D8/02 ,  C21D6/00 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/58 ,  C21D1/84 ,  C21D6/02

CPC分类号： C22C38/58 ,  C21D1/84 ,  C21D6/02 ,  C21D8/0205 ,  C21D8/0263 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50

摘要： The invention relates to an ultra-heavy steel plate with low cracking sensitivity and low yield ratio, the mass percentages of chemical components of the steel plate are C 0.05-0.09; Si 0.2-0.4; Mn 1.3-1.6; Al 0.02-0.04; Nb 0.03-0.08; V 0.03-0.08; Cr 0.1-0.5; Ni 0.1-0.5; Mo 0.1-0.3; Cu 0.2-0.5; Ti 0.01-0.02; P≤0.015; S≤0.003; N≤0.007, the balance being Fe and inevitable impurities; the carbon equivalent is ≤0.43, the cold cracking sensitivity coefficient Pcm is ≤0.20. A low cracking sensitivity and low yield ratio steel plate with a thickness of 40-70 mm is manufactured by the process steps of KR molten iron pretreatment - converter smelting - LF refining - RH vacuum degassing - continuous casting - lid-covering slow cooling for the continuous casting slabs - casting slabs heating - controlled rolling - controlled cooling - hot straightening - air cooling and so on.

摘要翻译： 本发明涉及一种低开裂敏感度和低屈服比的超重钢板，其钢板化学成分的质量百分含量为C 0.05〜0.09; Si 0.2-0.4; Mn 1.3-1.6; Al 0.02-0.04; Nb 0.03-0.08; V 0.03-0.08; Cr 0.1-0.5; Ni 0.1-0.5; Mo 0.1-0.3; Cu 0.2-0.5; Ti 0.01-0.02; P≤0.015; S≤0.003; N≤0.007，余量为Fe和不可避免的杂质; 碳当量≤0.43，冷裂敏感系数Pcm≤0.20。 通过KR铁水预处理 - 转炉冶炼 - LF精炼--RH真空脱气 - 连续铸造 - 盖子覆盖缓慢冷却的工艺步骤来制造厚度为40-70mm的低开裂敏感度和低屈服比钢板 连铸板坯 - 铸坯热控轧制控制冷却 - 热矫直 - 空冷等。