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Heat Treatment Characteristics of Age-hardened Steel Plastic Mold

1. The heat treatment process of age hardening steel is divided into two basic steps. First, the solution treatment is carried out, that is, the steel is heated to a high temperature to dissolve various alloying elements into the austenite, and after the austenite is completed, the martensite structure is obtained by quenching. The second step is aging treatment, and aging is used to strengthen the mechanical properties that meet the final requirements.

2. The solution treatment heating is generally carried out in a salt bath furnace or a box furnace. The heating time can be respectively: 1min/mm, 2~2.5min/mm, quenching adopts oil cooling, and steel with good hardenability can also be air-cooled. If the final forging temperature can be accurately controlled when forging the die blank, solution quenching can be performed directly after forging.

3. The aging treatment is best carried out in a vacuum furnace. If it is carried out in a box furnace, in order to prevent the surface of the mold from being oxidized, a protective atmosphere must be introduced into the furnace, or aluminum oxide powder, graphite powder, or cast iron scraps should be used for protection in the box. Aging under conditions. Packing protection heating should appropriately extend the heat preservation time, otherwise it will be difficult to achieve the aging effect. Refer to Table 1 for the heat treatment process of partially age-hardening plastic mold steel.

Grade	Solution treatment process	Aging treatment process	Aging hardness HRC
06Ni	800~850℃ Oil cooler	510~530℃×（6~8）h	43~48
PMS	800~850℃ Air cooling	510~530℃×（3~5）h	41~43
25CrNi3MoAl	850℃ Water quenching or Air cooling	520~540℃×（6~8）h	39~42
SM2	900×2h Oil cooler+700℃×2h	510℃×10h	39~40
PCR	1050℃Solid solution air cooling	460~480℃×4h	42~44