Numerals & Digits |
Type of steel & nominal alloy content, % |
| |
|
Carbon Steels |
|
| 10xx(a)` |
Plain carbon (Mn 1.00 max) |
| 11xx |
Resulferised |
| 12xx |
Resulferised and rephosphorised |
| 15xx |
Plain carbon (max Mn range: 1.00 - 1.65) |
| |
|
Manganese steels |
|
| 13xx |
Mn 1.75 |
| |
|
Nickel Steels |
|
| 23xx |
Ni 3.50 |
| 25xx |
Ni 5.00 |
| |
|
Nickel-cromium steels |
|
| 31xx |
Ni 1.25; Cr 0.65 and 0.80 |
| 32xx |
Ni 1.75; Cr 1.07 |
| 33xx |
Ni 3.50; Cr 1.50 and 1.57 |
| 34xx |
Ni 3.00; Cr 0.77 |
| |
|
Molybdenum steels |
|
| 40xx |
Mo 0.20 and 0.25 |
| 44xx |
Mo 0.40 and 0.52 |
| |
|
Chromium-molybdenum steels |
|
| 41xx |
Cr 0.50, 0.80 and 0.95; Mo 0.12, 0.20, 0.25 and 0.30 |
| |
|
Nickel-chromium-molybdenum steels |
| 43xx |
Ni 1.82; Cr 0.50 and 0.80; Mo 0.25 |
| 43BVxx |
Ni 1.82; Cr 0.50; Mo 0.12 and 0.25; V 0.03 min |
| 47xx |
Ni 1.05; Cr 0.45; Mo 0.20 and 0.35 |
| 81xx |
Ni 0.30; Cr 0.40; Mo 0.12 |
| 86xx |
Ni 0.55; Cr 0.50; Mo 0.20 |
| 87xx |
Ni 0.55; Cr 0.50; Mo 0.25 |
| 88xx |
Ni 0.55; Cr 0.50; Mo 0.35 |
| 93xx |
Ni 0.55; Cr 1.20; Mo 0.12 |
| 94xx |
Ni 0.45; Cr 0.40; Mo 0.12 |
| 97xx |
Ni 0.55; Cr 0.20; Mo 0.20 |
| 98xx |
Ni 1.00; Cr 0.80; Mo 0.25 |
| |
|
Nickel-molybdenum steels |
|
| 46xx |
Ni 0.85 and 1.82; Mo 0.20 and 0.25 |
| 48xx |
Ni 3.50; Mo 0.25 |
| |
|
Chromium steels |
|
| 50xx |
Cr 0.27, 0.40, 0.50 and 0.65 |
| 51xx |
Cr 0.80, 0.87, 0.92, 1.00 and 1.05 |
| |
|
Chromium (bearing) steels |
|
| 50xxx |
Cr 0.50; C 1.00 min |
| 51xxx |
Cr 1.02; C 1.00 min |
| 52xx |
Cr 1.45; C 1.00 min |
| |
|
Chromium-vanadium steels |
|
| 61xx |
Cr 0.60, 0.80 and 0.95; V 0.10 and 0.15 min |
| |
|
Tungsten-chromium steels |
|
| 72xx |
W 1.75; Cr 0.75 |
| |
|
Silicon - manganese steels |
|
| 92xx |
Si 1.40 and 2.00; Mn 0.65, 0.82 and 0.85; Cr 0 and 0.65 |
| |
|
High-strength low-alloy steels |
|
| 9xx |
Various SAE grades |
| |
|
Boron steels |
|
| xxBxx |
B denotes boron steel |
| |
|
Leaded steels |
|
| xxLxx |
L denotes leaded steels |
| |
|
| (x) The xx in the last two digits of these designations indicates that the carbon content (in hundredths of a percent)is to be inserted |
