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A......................Air-Hardening Steels
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D......................Die Steel Alloys
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F...................Carbon/Tungsten Alloy Steels
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H.....................Hot Work Alloy Steels
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L.....................Low Alloy Steels
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M....................Molybdenum Alloy Steels
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O................... Oil Hardening Alloy Steels
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P....................Mold Steel Alloys
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S.....................Shock Resistant Alloy Steels
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T....................Tungsten Alloy Steels
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W..................Water Hardening Alloy Steels