| Series Designation |
Key Alloying Elements |
| Carbon Steels |
|
| 10xx |
Plain Carbon (Mn 1.00% max) |
| 11xx |
Resulfurized |
| 12xx |
Resulfurized and Rephosphorized |
| 15xx |
Plain Carbon (Mn 1.00% to 1.65%) |
| Manganese Steels |
| 13xx |
Manganese 1.60-1.90% |
| Nickel Steels |
| 23xx |
Nickel 3.5% |
| 25xx |
Nickel 5.0% |
| Nickel - Chromium Steels |
| 31xx |
Nickel 1.25% - Chromium 0.65% or 0.80% |
| 32xx |
Nickel 1.25% - Chromium 1.07% |
| 33xx |
Nickel 3.50% - Chromium 1.50 or 1.57% |
| 34xx |
Nickel 3.00% - Chromium 0.77% |
| Molybdenum Steels |
| 40xx |
Molybdenum 0.20 or 0.25% |
| 44xx |
Molybdenum 0.40 or 0.52% |
| Chromium - Molybdenum (Chromoly) Steels |
| 41xx |
Chromium 0.50, 0.80 or 0.95% - Molybdenum 0.12, 0.20, 0.25 or 0.30% |
| Nickel - Chromium - Molybdenum Steels |
| 43xx |
Nickel 1.82% - Chromium 0.50 or 0.80% - Molybdenum 0.25% |
| 47xx |
Nickel 1.05% - Chromium 0.45% - Molybdenum 0.25 or 0.35% |
| 81xx |
Nickel 0.30% - Chromium 0.40% - Molybdenum 0.12% |
| 86xx |
Nickel 0.55% - Chromium 0.50% - Molybdenum 0.20% |
| 87xx |
Nickel 0.55% - Chromium 0.50% - Molybdenum 0.25% |
| 88xx |
Nickel 0.55% - Chromium 0.50% - Molybdenum 0.35% |
| 93xx |
Nickel 3.25% - Chromium 1.20% - Molybdenum 0.12% |
| 94xx |
Nickel 0.45% - Chromium 0.40% - Molybdenum 0.12% |
| 97xx |
Nickel 0.55% - Chromium 0.20% - Molybdenum 0.20% |
| 97xx |
Nickel 1.00% - Chromium 0.80% - Molybdenum 0.25% |
| Nickel-Molybdenum Steels |
| 46xx |
Nickel 0.85% or 1.82% - Molybdenum 0.20% or 0.25% |
| 48xx |
Nickel 3.50% - Molybdenum 0.25% |
| Chromium Steels |
| 50xx |
Chromium 0.27% or 0.40% or 0.50% or 0.65% |
| 51xx |
Chromium 0.80% or 0.87% or 0.92% or 1.00% or 1.05% |
| 50xxx |
Chromium 0.50% - Carbon 1.00% min |
| 51xxx |
Chromium 1.02% - Carbon 1.00% min |
| 52xxx |
Chromium 1.45% - Carbon 1.00% min |
| Chromium-Vanadium Steels |
| 61xx |
Chromium 0.60% or 0.80% or 0.95% - Vanadium 0.10% or 0.15% min |
| Tungsten-Chromium Steels |
| 72xx |
Tungsten 1.75% - Chromium 0.75% |
| Silicon-Manganese Steels |
| 92xx |
Silicon 1.40% or 2.00% - Manganese 0.65% or 0.82% or 0.85% - Chromium
0.00% or 0.65% |
| High-Strength Low-Alloy Steels |
| 9xx |
Various SAE grades |
| xxBxx |
Boron steels |
| xxLxx |
Leaded steels |
| Tool Steels |
| Tool Steels are wear resistant, ferrous alloys based on iron and carbon with
high levels of alloying (hardenability and property modifying) elements such as chromium, molybdenum, tungsten, and
vanadium. Specific tool steel grades are available for die or cold work, hot work, high speed and shock resistance
applications. Tool Steel alloys are used in a wide variety of applications that require wear resistance. |
| Ax |
Cold working, air hardening, medium alloy |
| Dx |
Cold working, high carbon, high chromium |
| Fx |
Special purpose, carbon tungsten |
| Hx |
Hot working, H1-H19-Chromium base, H20-H39-Tungsten base, H40-H59-Molybdenum base |
| Lx |
Special purpose, low alloy |
| Mx |
High speed, molybdenum base |
| Ox |
Cold working, oil hardening |
| Px |
Plastic mold |
| Sx |
Shock resisting, tungsten base |
| Tx |
High speed, tungsten base |
| Wx |
Water hardening |
