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