摘要
低合金高强度钢Q345E(/%:0.12~0.15C,0.20~0.25Si,1.40~1.50Mn,≤0.010P,≤0.005S)的生产流程为80 t顶底复吹转炉-LF-RH-φ450 mm铸坯CC-中110 mm棒材连轧工艺。工艺试验了压缩比(10.33~20.25)、开轧温度(1120~1 080℃)和冷却方式(0.2℃/s空冷和0.5℃/s风冷)对该钢-40℃,V-型缺口冲击韧性的影响。结果表明,随压缩比增加,开轧温度降低,冷却速度增加,该钢-40℃冲击功显著增加,采用压缩比16.74,开轧温度1100℃,0.5℃/s风冷工艺,Q345E钢组织细小、均匀,-40℃冲击功为40 J。
The production flowsheet for low alloy high Strength steel Q345E(/%:0.12 ~ 0.15 C,0.20 ~ 0.25 Si,1.40 ~ 1.50 Mn,≤0.010 P,≤0.005S) is 80 t top and bottom combined blown converter- LF- RH-φ450 mm bloom CC-φ110 mm bar continuous rolling process.The effect of reduction ratio(10.33 ~ 20.25),beginning rolling temperature(1 120 ~ 1 080 ℃) and cooling mode(0.2 ℃/s air cooling and 0.5 ℃/s wind cooling) on V-notch impact energy of steel at — 40 ℃ has been commercial-tested.Results show that with increasing reduction ratio,decreasing beginning rolling temperature and increasing cooling speed the impact energy of steel at- 40 ℃ obviously increases;and with using reduction ratio 16.74,beginning rolling at 1 100 ℃ and 0.5 ℃/s wind cooling process,the steel Q345 E has fine and homogeneous structure and its impact energy at-40 ℃ is 40 J.
出处
《特殊钢》
北大核心
2015年第3期64-66,共3页
Special Steel
基金
江苏省重点技术创新项目[2011]-524
关键词
风电法兰用钢Q345E
控冷控轧工艺
组织
低温冲击功
Q345E Steel for Wind Power Flange
Controlling Rolling and Cooling Process
Structure
Low Temperature Impact Energy