... surface hardening, we have250KW, 160Kw intermediate frequency equipment, and 100Kw high frequency equipment, which can processthe surface hardening ... roll, rolling mill roll. etcRing parts: the hardening and tempering, surface quenching for all kinds of bearing roller ... and tempering, surface quenching for large size gear(modulus over 5 and diameter within 10m.) all kinds of alloy shaft per drawings and ...