Forged steel round bar of black surface
Specification:JIS G4051 S45C,H13,SCM440,
S20C,S30C,S35C,38CrMoAl,SNCM439,16MnCr5,
20MnCr5,S355J2G3,34CrNiMo2,ST52-3,and others.
UT:Gurantee,or according th…
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