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Can 304 stainless steel be used as plastic mold material?

Probably not,

304 stainless steel

is

austenitic stainless steel

. Austenitic stainless steel cannot be quenched to increase its hardness. If you want to use stainless steel to make

plastic molds

, you should use

martensitic stainless steel

. For example: 410, 420, 440, etc.