steel grade: 45#, 45Mn2, 40Cr; standard: YB\T5035;Specification: Outer Diameter 76-108, Thickness 7-18. Steel grade: 45#, 45Mn2, 40Cr;Standard: YB\T5035;Specification: Outer Diameter 76-108, Thickness 7-18;Application: The products apply to the carbon and alloy seamless steel tube of automobile halfshaft bushing and driving axis tube.