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 ------------------------------------------------------------------------------- S. A. E. | | | | | | Specification| | | | | | no. --- Carbon | Manganese | | | Chromium | |(minimum and|(minimum and|Phosphorus|Sulphur |(minimum and| Heat | maximum) | maximum) |(maximum) |(maximum)| maximum) |treatment ---------|------------|------------|----------|---------|------------|--------- 5,120 |0.15 to 0.25| * | 0.04 | 0.045 |0.65 to 0.85| B 5,140 |0.35 to 0.45| * | 0.04 | 0.045 |0.65 to 0.85| H or D 5,165 |0.60 to 0.70| * | 0.04 | 0.045 |0.65 to 0.85| H or D | | | | | | 5,195 |0.90 to 1.05|0.20 to 0.45| 0.03 | 0.03 |0.90 to 1.10|M, P or R 51,120 |1.10 to 1.30|0.20 to 0.45| 0.03 | 0.03 |0.90 to 1.10|M, P or R 5,295 |0.90 to 1.05|0.20 to 0.45| 0.03 | 0.03 |1.10 to 1.30|M, P or R 52,120 |1.10 to 1.30|0.20 to 0.45| 0.03 | 0.03 |1.10 to 1.30|M, P or R ------------------------------------------------------------------------------- --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.