Jisho

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こう クロムモリブデン鋼
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Noun
1. chromium molybdenum steel; chrome molybdenum steel​
Wikipedia definition
2. 41xx steel​41xx steel is a family of SAE steel grades, as specified by the Society of Automotive Engineers (SAE). Alloying elements include chromium and molybdenum, and as a result these materials are often referred to as chromoly steel or CRMO. They have an excellent strength to weight ratio and are considerably stronger and harder than standard 1020 steel, but are not easily welded (need pre and post weld thermal treatement to avoid cold cracking).
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