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ANSI-SAE-Numbering-System
ANSI/SAE Numbering System for Steel
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Carbon steels
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10XX
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Plain carbon, Mn 1.00% max
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11XX
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Resulfurized free machining
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12XX
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Resulfurized/rephosphorized free machining
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15XX
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Plain carbon, Mn 1.00-1.65%
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Manganese steel
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13XX
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Mn 1.75%
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Nickel steels
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23XX
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Ni 3.50%
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25XX
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Ni 5.00%
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Nickel-chromium steels
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31XX
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Ni 1.25%, Cr .65-.80%
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32XX
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Ni 1.75%, Cr 1.07%
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33XX
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Ni 3.50%, Cr 1.50-1.57%
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34XX
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Ni 3.00%, Cr .77%
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Molybdenum steels
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40XX
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Mo .20-.25%
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44XX
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Mo .40-.52%
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Chromium-molybdenum steels
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41XX
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Cr .50-.95%, Mo .12-.30%
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Nickel-chromium-molybdenum steels
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43XX
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Ni 1.82%, Cr .50-.80%, Mo .25%
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47XX
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Ni 1.05%, Cr .45%, Mo .20-.35%
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Nickel-molybdenum steels
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46XX
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Ni .85-1.82%, Mo .20-.25%
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48XX
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Ni 3.50%, Mo .25%
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Chromium steels
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50XX
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Cr .27-.65%
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51XX
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Cr .80-1.05%
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50XXX
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Cr .50%, C 1.00% min
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51XXX
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Cr 1.02%, C 1.00% min
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52XXX
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Cr 1.45%, C 1.00% min
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Chromium-vanadium steels
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61XX
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Cr .60-.95%, V .10-.15%
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Tungsten-chromium steels
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72XX
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W 1.75%, Cr .75%
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Nickel-chromium-molybdenum steels
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81XX
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Ni .30%, Cr .40%, Mo .12%
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86XX
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Ni .55%, Cr .50%, Mo .20%
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87XX
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Ni .55%, Cr .50%, Mo .25%
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88XX
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Ni .55%, Cr .50%, Mo .35%
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Silicon-manganese steels
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92XX
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Si 1.40-2.00%, Mn .65-.85%, Cr 0-.65%
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Nickel-chromium-molybdenum steels
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93XX
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Ni 3.25%, Cr 1.20%, Mo .12%
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94XX
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Ni .45%, Cr .40%, Mo .12%
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97XX
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Ni .55%, Cr .20%, Mo .20%
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98XX
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Ni 1.00%, Cr .80%, Mo .25%
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