This specification establishes requirements and procedures for generating nitrided surfaces on steel parts using a process controlled by the nitriding potential. See definition of compound layer in 8.5.1.
1. SCOPE: 1.1 Type: This specification covers high quality holts and screws made of a low-alloy, heat resistant steel. 1. 2 Application: Primarily for joining parts where high strength up to 900'F (480'C) is reqnired.
This practice provides a method of evaluating microhardness and microstructure very close to the surface. It is useful for process control in heat treatment of steel parts to detect nitriding and carburization as well as decarburization and excessive intergranular oxidation. It also may be valuable for other evaluations, e.g., plated coatings and other materials.