Annealing: Stress relief, soften for machining
Quenching: Hardening to HRC 55-65
Tempering: Reduce brittleness, adjust final hardness
Nitriding: Surface hardening 0.1-0.3mm case depth

Heat treatment accounts for 5-10% of total mold cost but affects mold life by 300%.

Full guide: https://www.mfgabc.com/guides/mold-heat-treatment-china.html

How do you verify heat treatment quality?

你们厂里是怎么处理的？来评论区聊聊。