ASTM F2328

Full Name

ASTM F2328 – Standard Test Method for Determining Decarburization and Carburization in Hardened and Tempered Threaded Steel Bolts, Screws, Studs, and Nuts


This test method covers procedures for measuring, classifying, and determining the presence of decarburization and carburization in the threaded section of hardened and tempered inch series steel bolts, screws, studs, nuts, and similar parts which have been heated to facilitate fabrication or to modify their mechanical properties.

This test method is not intended to address products which are intentionally carburized to achieve specific results.


carburization; complete decarburization; decarburization; gross decarburization; HK; HV; Knoop; microindentation; partial decarburization; tempered martensite; Vickers