Article: steel flat bar Grade: SKD11, SKD61, etc. as customized Size: 20- ... ~6m as customized with UT Article: SKD61, SKD11, SKT4, Cr12Mo1V1, Steel flat bar Grade:SKD61, SKD11, SKT4, Cr12Mo1V1 etc. as customizedSize ... ingot annealheatinghigh-speed forging, refining forgingannel, retarded cooling, air coolingquenching and tempering treatmentfinishing operationtestfinished products