ASTM A 355 - 89 (Reapproved 2006) Standard Specification for Steel Bars, Alloys, for Nitriding

American Society for Testing and Materials (ASTM). Current edition approved March 1, 2006. Published March 2006. Originally approved in 1952. Last previous edition approved in 2000 as A 355 – 89 (2000). 3 p. This specification covers alloy steel bars, suitable for surface hardening by nitriding, designated as Classes A, B, C, and D. Class A and Class D bars are general-purpose bars; Class B bars are free-machining bars; Class C bars contain 3.50 % nickel and are characterized by higher core strength.