--
S. A. E. | | | Phosphorus| Sulphur | | |
Specification| | | (maximum)|(maximum) | | | Heat
no. ------ | ------ | ---- | |treatment
| Carbon | Manganese | | | Nickel | Chromium \
|(minimum and|(minimum and| | |(minimum and|(minimum and |
| maximum) | maximum) | | | maximum) | maximum) |
------|------------|------------|----|-----|------------|-------------|--------
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.

TABLE 8.--CHROMIUM STEELS
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S. A. E. | | | | | |
Specification| | | | |