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I heard some times with some kinds of steels, the double normalizing or hardening were used, so my question is: What is the main function of multiple or duplex heat treatment, and when is more useful

Thanks for your answers put the problem with the size, where the real product it's about 8m length and about 1/2m diameter

I am trying to do experiments to simulate heat treatment for heavy forging 4340 steel, but the problem is I couldn't get a martensite due to very low cooling rate. my question: 1- Is there any thing can I do to help me to get martensite, Knowing that I do normalizing at 860C, quenching at 860C...