... dia :8mm~400mm grade :600 series model number :17-4PH AISI 630/ 17-4PH stainless steel round bar 17-4PH (630 ... stainless )- You choose !!1. Diameter: Ø1'', Ø2'', Ø2.5'', Ø3'', Ø3.5'', Ø4'', Ø4.5 ... , pump shaft etc8. Chemical composition:C:≤0.07, Si:≤1.0, Mn:≤1.0, P:≤0.04, S:≤0.03, Cr:15 ... composition (%): CSi MnP SCr Ni Cu Nb ≤0.07 ≤1.0 ≤1.0 ≤0.04 ≤0.0315.0~17.0 3.0 ...