... .Material:CK45,ST52,20MnV6,42CrMo4,40Cr 2.Ground and chrome plated 3.Diameter:6~1000mm 4.length:1000~8000mm 5.ISO9001 ... >40JNORMALIZE42CrMo498085014>47JQ + T40Cr100080010 Q + T3. SUPPLY CONDITION Ground and chrome plated 4. CHROME THICKNESS 20 to 30 micron5. SURFACE ROUGHNESS Ra ... related with material heat treatment and plating is required chrome plated CK45 piston rod