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304 stainless steel tube: heat treatment does not enhance its hardness

The 304 stainless steel tube is austenitic stainless steel. For austenitic stainless steel, it cannot be strengthened by heat treatment. The main reason is that the austenitic structure does not have the condition of quenching to form quenched martensite. If you want to strengthen the hardness of the 304 stainless steel tube, you can only hardening treatment.

Generally, the surface hardening treatment of 304 stainless steel tube can be selected, and the nitriding treatment can be selected. The Cr and N in 304 have good fusion acceptance ability, and can generate diffused partial nitride in the nitriding treatment, thereby achieving the  effect of strengthening the hardness of 304 stainless steel tube surface.