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非调质曲轴钢S38MnSiV低温轧制技术研究
Research on Low Temperature Rolling Technology of Non-quenched Crankshaft S38MnSiV Steel
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- DOI:
- 作者:
- 朱叶
ZHU Ye
- 作者单位:
- 石钢京诚装备技术有限公司技术中心
Technical Center,Shigang Jingcheng Equipment Development&Manufacturing Co.,Ltd.,Yingkou 115000,China
- 关键词:
- 低温控轧 非调质钢 S38MnSiV 晶粒度 带状组织
low temperature rolling non quenched and tempered steel S38MnSiV grain size bands structure
- 摘要:
- 采用“100t转炉→120tLF→120tVD→ФH50圆坯连铸→铸坯加热→开坯→8架连轧(低温控轧)→控制冷却”工艺生产了Ф150mm非调质曲轴用S38MnSiV钢。通过低温控制轧制和正常轧制进行了对比试验研究。结果表明,与正常轧制相比,当连铸坯均热温度为1210〜1260℃,开坯温度为1000〜1050℃,开坯后冷却速度控制到0.2-0.3℃/s,进入连轧温度为880〜895℃;轧后冷却速度控制到0.3-0.4℃/s时,S38MnSiV钢1/2R珠光体球团晶粒度6.5〜5.0级,提高2级;心部6.54.0级,提高3.5〜1.0级;带状2.0级,提高0.5级;力学性能差异较小。Using 4100 t converter 120 t→120 t LF→120 t VD→Ф450 round billet continuous casting→slab heating→slab opening→eight continuous rolling(low temperature controlled rolling)to control cooling process’,150 mm in diameter crankshaft with S38MnSiV non-quenched and tempered steel was prepared.A comparative experiment was conducted between controlled rolling at low temperature and normal rolling.The results show that,compared with normal rolling,when the billet's soaking temperature is 1210-1260℃,the slab opening temperature is 1000-1050℃,the cooling rate after slab opening is controlled to 0.2-0.3℃/s,the rolling temperature is 880-895℃.When the cooling rate of S38MnSiV steel is controlled to 0.3~0.4℃/s,the grain size of 1/2R pearlite pellets of S38MnSiV steel is 6.5~5.0 grades,increasing by 2 grades.The heart level is 6.5〜4.0 grades,and the improvement is 3.5〜1.0 Grade 2.0 in banded structure,0.5 in increase;There is little difference in mechanical properties.