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Topic: What material is best for lime milk tanks?

I am fabricating a lime milk tank. The shell/cone/roof is designed with SS316L material. The leg support is designed with SA-36/S 275 JR. This is done to reduce the overall cost without comprising on quality. I want to know if my design is OK? Or should I go for SS316L material for the supporting legs also? These legs are very expensive in SS316L material.