Classification of Case Hardening

Case hardening-the production of parts that have hard, wear-resistant surfaces, but with softer and/or tougher cores-can be accomplished using two distinct methods.
(continued below)

One approach is to use a grade of steel that already contains sufficient carbon to provide the required surface after heat treatment. The surface areas requiring the higher hardness are then selectively heated and quenched. The second method is to use a steel that normally is not capable of being hardened to the desired degree, then alter the composition of the surface layers by diffusion so it either can be hardened or, in some instances, becomes hard during processing. Precise classification of case hardening is difficult, but for most practical purposes, case hardening treatments can be broadly classified into four groups including carburizing, carbonitriding, nitriding, and nitrocarburizing.

View associated graphic.

HTS Regional Events

Cleaning Requirements for Heat Treatment - Developments and Applications
October 29-30, 2008
Worcester Polytechnic Institute, Worcester, Mass.
Visit
http://www.asminternational.org/htcleaning08/

To learn more about tabletop exhibiting and sponsorship opportunities, or to discuss customizing a program to meet your specific needs; contact Kelly Thomas, Exposition Sales Manager at 440-338-1733; or e-mail: kelly.thomas@asminternational.org.

Short Course: Heat Treating for the Non-Heat Treater
October 28, Worcester Polytechnic Institute, Worcester, Mass.
Instructor: Scott MacKenzie
For the non-heat treater (part designers, material specifiers, purchasing agents, technicians) who need a basic education in heat treating. Contact Customer Service: tel: 800-336-5152, ext. 0; e-mail: customerservice@asminternational.org.

Click here for past One-Minute Mentors.