Method for heat treatment of steel

Details Method for heat treatment of steel Method for heat treatment of steel

1998-11-27

2000-11-21

Jenkins, Daniel J.

Metal treatment

Process of modifying or maintaining internal physical...

Carburizing or nitriding using externally supplied carbon or...

148225, 148319, C23C 822, C23C 846, C23C 866

Patent

active

061497347

ABSTRACT:
A method for the heat treatment of steel, comprising carburization hardening said steel, to form carburized steel, followed by a second hardening, reduces the grain size of steel while precipitating carbonitrides inside the grains of steel, thereby increasing the strength of the heat-treated steel. The carburization hardening comprises heating the steel to a first austenitic temperature range in an atmosphere comprising a carburizing gas and optionally ammonia, cooling the steel to a martensitic temperature range, and quenching the steel, and the second hardening comprises heating the carburized steel to a second austenitic temperature range in an atmosphere comprising a carburizing gas and ammonia, and quenching the steel.

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patent: 5853502 (1998-12-01), Aihara et al.
patent: 5944916 (1999-08-01), Chung

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