The results show that the carburizedcase uniformity can be ensured through sand blasting or phosphating before carburizing, and NH3 is filled during carburizing.
结果表明：零件渗碳前经吹砂或磷化，渗碳时通入NH3，能够保证渗碳层均匀。
2
Hardening: Case hardening process whereby the carburized outer surface is made hard and strong while the center (core) is made tough and flexible.
淬火：是使渗碳的表面变硬，芯部变得有柔韧性的表面硬化工艺。
3
The requirement for retained austenite content in the carburized or carbonitrided case will vary with the type of product.