piston ring steel wire
1.different size(Flat-T:0.2~4.0,W:0.3~6.0,Round-0.5~5.0)
2.many grade: SAE9254V,B55SiCr,50CrV,60Si2Mn,6Cr13Mo,,8Cr17Mo,304,631,72A,65Mn,82B .etc.
3.different delivery conditions