Which category of stainless steel is very resistant to oxidation and cannot be hardened by heat treatment?
A. Ferritic
B. Austentic
C. Martensitic
D. Bronze
A. Correct. Ferritic stainless steel is very resistant to oxidation and cannot be hardened by heat treatment.
B. Incorrect. Austentic stainless steel is very corrosion resistant and cannot be hardened by heat treatment.
C. Incorrect. Martensitic stainless steel is a very hard, high-strength alloy.
D. Incorrect. Bronze is not a category of stainless steel.
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