Lesson plan
154CM
154CM is a martensitic stainless steel developed in the United States by Crucible Steel. The grade is a modification of type 440C stainless steel, with about 4% molybdenum added. The molybdenum raises the attainable hardness and improves resistance to pitting corrosion. The steel was created as a corrosion-resistant bearing material for aerospace use. From the 1970s onward it became widely known as a knife blade steel. It is also the basis of the powder metallurgy grade CPM 154 and of the Japanese grade ATS-34. Crucible Industries ceased production in 2025, but the composition is not patented and steels of the same chemistry remain available.
Article summary
154CM is a martensitic stainless steel developed in the United States by Crucible Steel. The grade is a modification of type 440C stainless steel, with about 4% molybdenum added. The molybdenum raises the attainable hardness and improves resistance to pitting corrosion. The steel was created as a corrosion-resistant bearing material for aerospace use. From the 1970s onward it became widely known as a knife blade steel. It is also the basis of the powder metallurgy grade CPM 154 and of the Japanese grade ATS-34. Crucible Industries ceased production in 2025, but the composition is not patented and steels of the same chemistry remain available.
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Discussion questions
- Summarise the article in your own words. Which single claim would you verify first, and why?
- Which claim in this article is most likely to be revised as the sources update? How would you check its current status?
- If two sources disagreed about one of these facts, what would you need in order to trust one over the other?
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