When chromium content is increased to 16 to 18 per cent and silicon is added, from 2 to 4 per cent, this steel becomes rust proof in its raw state, as soon as the outside surface is removed. It does not need to be heat-treated in any way. These compositions are both patented.
S. A. E. STANDARD STEELS
The following steel specifications are considered standard by the Society of Automotive Engineers and represents automobile practice in this country. These tables give the S. A. E. number, the composition of the steel and the heat treatment. These are referred to by letter—the heat treatments being given in detail on pages 134 to 137 in Chap. 8. It should be noted that the percentage of the different ingredients desired is the mean, or halfway between the minimum and maximum.
| S. A. E. Specification no. | Carbon (minimum and maximum) | Manganese (minimum and maximum) | Phosphorus (maximum) | Sulphur (maximum) | Heat treatment |
|---|---|---|---|---|---|
| 1,010 | 0.05 to 0.15 | 0.30 to 0.60 | 0.045 | 0.05 | Quench at 1,500 |
| 1,020 | 0.15 to 0.25 | 0.30 to 0.60 | 0.045 | 0.05 | A or B |
| 1,025 | 0.20 to 0.30 | 0.50 to 0.80 | 0.045 | 0.05 | H |
| 1,035 | 0.30 to 0.40 | 0.50 to 0.80 | 0.045 | 0.05 | H, D or E |
| 1,045 | 0.40 to 0.50 | 0.50 to 0.80 | 0.045 | 0.05 | H, D or E |
| 1,095 | 0.90 to 1.05 | 0.25 to 0.50 | 0.040 | 0.05 | F |
| S. A. E. Specification no. | Carbon | Manganese | Phosphorus (maximum) | Sulphur |
|---|---|---|---|---|
| 1,114 | 0.08 to 0.20 | 0.30 to 0.80 | 0.12 | 0.06 to 0.12 |
| S. A. E. Specification no. | Carbon (minimum and maximum) | Manganese (minimum and maximum) | Phosphorus (maximum) | Sulphur (maximum) | Nickel (minimum and maximum) | Heat treatment |
|---|---|---|---|---|---|---|
| 2,315 | 0.10 to 0.20 | 0.50 to 0.80 | 0.04 | 0.045 | 3.25 to 3.75 | G, H or K |
| 2,320 | 0.15 to 0.25 | 0.50 to 0.80 | 0.04 | 0.045 | 3.25 to 3.75 | G, H or K |
| 2,330 | 0.25 to 0.35 | 0.50 to 0.80 | 0.04 | 0.045 | 3.25 to 3.75 | H or K |
| 2,335 | 0.30 to 0.40 | 0.50 to 0.80 | 0.04 | 0.045 | 3.25 to 3.75 | H or K |
| 2,340 | 0.35 to 0.45 | 0.50 to 0.80 | 0.04 | 0.045 | 3.25 to 3.75 | H or K |
| 2,345 | 0.40 to 0.50 | 0.50 to 0.80 | 0.04 | 0.045 | 3.25 to 3.75 | H or K |
| S. A. E. Specification no. | Carbon (minimum and maximum) | Manganese (minimum and maximum) | Phosphorus (maximum) | Sulphur (maximum) | Nickel (minimum and maximum) | Chromium (minimum and maximum) | Heat treatment |
|---|---|---|---|---|---|---|---|
| 3,120 | 0.15 to 0.25 | 0.50 to 0.80 | 0.04 | 0.045 | 1.00 to 1.50 | 0.45 to 0.75* | G, H or D |
| 3,125 | 0.20 to 0.30 | 0.50 to 0.80 | 0.04 | 0.045 | 1.00 to 1.50 | 0.45 to 0.75* | H, D or E |
| 3,130 | 0.25 to 0.35 | 0.50 to 0.80 | 0.04 | 0.045 | 1.00 to 1.50 | 0.45 to 0.75* | H, D or E |
| 3,135 | 0.30 to 0.40 | 0.50 to 0 80 | 0.04 | 0.045 | 1.00 to 1.50 | 0.45 to 0 75* | H, D or E |
| 3,140 | 0.35 to 0.45 | 0.50 to 0.80 | 0.04 | 0.045 | 1.00 to 1.50 | 0.45 to 0.75* | H, D or E |
| 3,220 | 0.15 to 0.25 | 0.30 to 0.60 | 0.04 | 0.040 | 1.50 to 2.00 | 0.90 to 1.25 | G, H or D |
| 3,230 | 0.25 to 0.35 | 0.30 to 0.60 | 0.04 | 0.040 | 1.50 to 2.00 | 0.90 to 1.25 | H or D |
| 3,240 | 0.35 to 0.45 | 0.30 to 0.60 | 0.04 | 0.040 | 1.50 to 2.00 | 0.90 to 1.25 | H or D |
| 3,250 | 0.45 to 0.55 | 0.30 to 0.60 | 0.04 | 0.040 | 1.50 to 2.00 | 0.90 to 1.25 | M or Q |
| X3,315 | 0.10 to 0.20 | 0.45 to 0.75 | 0.04 | 0.040 | 2.75 to 3.25 | 0.60 to 0.95 | G |
| X3,335 | 0.30 to 0.40 | 0.45 to 0.75 | 0.04 | 0.040 | 2.75 to 3.25 | 0.60 to 0.95 | P or R |
| X3,350 | 0.45 to 0.55 | 0.45 to 0.75 | 0.04 | 0.040 | 2.75 to 3.25 | 0.60 to 0.95 | P or R |
| 3,320 | 0.15 to 0.25 | 0.30 to 0.60 | 0.04 | 0.040 | 3.25 to 3.75 | 1.25 to 1.75 | L |
| 3,330 | 0.25 to 0.35 | 0.30 to 0.60 | 0.04 | 0.040 | 3.25 to 3.75 | 1.25 to 1.75 | P or R |
| 3,340 | 0.35 to 0.45 | 0.30 to 0.60 | 0.04 | 0.040 | 3.25 to 3.75 | 1.25 to 1.75 | P or R |
* Another grade of this type of steel is available with chromium content of 0.15 per cent to 45 per cent. It has somewhat lower physical properties.
—Two types of steel are available in this class, one with manganese 0.25 to 0.50 per cent (0.35 per cent desired), and silicon not over 0.20 per cent; the other with manganese 0.60 to 0.80 per cent (0.70 per cent desired), and silicon 0.15 to 0.50 per cent.