... -4PH (630 stainless )- You choose !!1. Diameter: Ø1'', Ø2'', Ø2.5'', Ø3'', Ø3.5'', Ø4'', Ø4.5'', Ø4 ... S:≤0.03, Cr:15.0~17.0, Ni:3.0~5.0, Cu:3.0~5 ... known as Type 630 is a chromium-copper precipitation hardening stainless steel used for applications requiring high ... diluted acids or salts where its corrosion resistance is equivalent to Alloy 304 or 430. ApplicationsStandardsOffshore (foils, helicopter deck ...