Abstract: Al-killed low carbon and low silicon steel has been produced by KR→BOF→CAS→RH→CCM process route. JNX06 steel satisfying the customer’s requirements could be produced by controlling sulfur content of molten iron in the converter, tapping and slag skimming, deoxidation alloying, CAS refining and slagging, RH vacuum, Ca treatment procedure, continous casting superheat control and stabilizing mould level. The mass fraction of silicon was controlled below 0.030%. The results under low power showed that the quality of casting was good, the level of center segregation of C-class was 1.0 and center porosity was 0.5.