AISI 17/4PH
A high strength chromium, nickel, copper stainless steel with similar corrosion resistance to Type 304.
Type 630 is generally comparable to Type 304 in corrosion resistance and is used in applications where the combination of moderate corrosion resistance and unusually high strength is required. The grade has high strength (including good mechanical properties up to 600F.
Single age variants of Type 630 are available as reported in ASTM A564, H900, H1025, H1075 & H1150.
17/4 PH was used more extensively in oil and gas until 2003 when it was reclassified by NACE. It is now restricted to use for special components and only restricted well environments. It is however used in a variety of other applications.
