10Cr21Mnl6NiN不锈钢冶炼与连铸生产实践

通过对10Cr21Mn16NiN高氮不锈钢冶炼和连铸工艺研究,在生产中改进两步法冶炼和连铸生产工艺,与三步法工艺相比,LF精炼后期增氮速度由5×10^-6～10×10^-6/min提高到20×10^-6～30×10^-6/min,LF精炼时间由390 min缩短至240 min,连铸等钢时间由4 h降至2 h以下;解决了钢包增氮炉渣外溢的问题;避免了方坯在连铸过程中的翘头,No.1、No.2流断浇率由开发时100%降至0,设备事故率由66.7%降至0,2炉连浇率实现100%。实践证明,方坯连铸机辊子非密排且仅有1台五辊拉矫机也能生产出高强不锈钢方坯。

Smelting and Continuous Casting Practice of Stainless Steel 10Cr21Mnl6NiN

Compare with the three-step method, through the study of smelting and continuous casting of High-Nitrogen stainless steel 10Cr21 Mnl6NiN, the two-step smelting and continuous casting technology has been optimized, the adding nitrogen rate is raised from 5 x 10 ^-6 ~ 10 x 10^-6/min to 20 x 10^-6~ 30 x 10 ^-6/min in later stages of LF, the LF refining time is shortened from 390 min to 240 min, the CCM steel waiting time is reduced from 4 h to 2 h ； it solves the problem of slag spilling during the nitrogen adding；it also avoids the billet buckling during continuous casting,the breakage rate of No. 1 & No. 2 casting strand reduces from 100% to O,the equipment accident rate decreases from 66. 7% to 0,to achieve 100% 2- heats sequence casting. The practice shows that the billet casting without closely spaced rolls can produced High-Nitrogen stainless steel even though with only one five-high withdrawing and straightening machine.