ASTM A 304 - 05a Standard Specification for Carbon and Alloy Steel Bars Subject to End-Quench Hardenability Requirements

American Society for Testing and Materials (ASTM). Current edition approved March 1, 2005. Published March 2005. Originally approved in 1947. Last previous edition approved in 2004 as A 304 – 04. 50 p. This specification covers hot-worked alloy, carbon, and carbon-boron steels in a variety of compositions and sizes, which may attain specified depth of hardening in the end quench test. These steel compositions are identified by the suffix letter H added to the conventional grade number.