How to choose the right steel for IML mold, thin wall mold?
For thin wall molds, especially under high speed high pressure injecting, steel hardness must be HRC42 above, thus mold can guarantee its lifetime.
NAK-80 or 718H, only with HRC30 above. No need to consider.
Even H13 is the basic steel for thin wall molds.
In additionally, raw material usually should be clear transparent,
which requires steel polishing property.
Above all, suggest S136 with HRC43-45.
If your budget limit, then suggest H13 with HRC43-45.