Gear Technology Magazine
www.geartechnology.com/articles/21135-gear-material-quality-how-to-judge-it-pitting-how-to-prevent-it

Gear Material Quality: How To Judge It...Pitting: How To Prevent It

March 1, 1993
How do we know when the gear material we buy is metallurgically correct? How can we judge material quality when all gear material looks alike?