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Zhangjiagang, China

Zhen F.,Control Iron and Steel Research Institute, China | Zhang K.,Control Iron and Steel Research Institute, China | Li Y.,Shasteel Group Co Ltd. | Cheng J.,Shasteel Group Co Ltd. | Qu J.,Control Iron and Steel Research Institute, China
Jinshu Rechuli/Heat Treatment of Metals

Continuous cooling transformation (CCT) behavior of a Q800CFE high strength steel with low welding crack sensibility was studied and the CCT diagram was constructed. Effect of controlled rolling and controlled cooling process parameters, i.e. finish rolling temperature, finish cooling temperature and cooling rate, on the microstructure and mechanical properties was investigated by industrial trials. The result indicates that the yield ratio (YR) can be lowered by increasing the finish rolling temperature due to a larger grain size; as the finish cooling temperature increases from 200 to 520℃, the yield strength (YS) and tensile strength (TS) both decrease, but the YR increases first and then decreases at the peak value of 400℃; with the cooling rate increases from 24 to 48℃/s, the YS, TS and YR all increase, but to a smaller extent when the cooling rate is higher than 32℃/s. ©, 2015, Chinese Mechanical Engineering Society of Heat Treatment. All right reserved. Source

Deng X.-Y.,Control Iron and Steel Research Institute, China | Ma J.-C.,Control Iron and Steel Research Institute, China | Zhao W.-J.,Control Iron and Steel Research Institute, China | Cao B.,Shasteel Group Co Ltd. | And 2 more authors.
Journal of Iron and Steel Research

To resolve the issues of high lime consumption and high FeO content in the slag during EAF steelmaking process, the effect of temperature, slag chemical composition, slag amount, and deslagging time on dephosphorization was investigated, the effect of carbon content of end point, slag basicity, and oxygen blowing intensity on FeO content of end point was also investigated, oxygen blowing schema and slag forming schema were optimized. The industrial practice shows that lime consumption decreases from 34. 3 to 25. 2kg/t, oxygen consumption decreases from 48. 2 to 42. 5m3/t, FeO content in final slag is reduced from 33. 4% to 25. 1 %, and carbon content of end point increases from 0. 07% to 0. 15%. Source

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