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API 570 Piping Inspector Practice Test

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Which stainless steel series is Martensitic?
Correct Answer:
410 series Stainless Steel
Explanation:
Martensitic stainless steels are the heat-treatable part of the stainless family. They contain enough carbon that, when quenched, the structure transforms to martensite, giving high hardness and strength while offering moderate corrosion resistance. This group sits in the 400-series, and a well-known example is the martensitic grade used for valve trim and cutlery. In contrast, the 300-series (like 316) are austenitic and cannot be hardened by heat treatment, and some 400-series grades are ferritic rather than martensitic. Therefore, the martensitic subset is represented by the 410-series.

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