708M40 / 709M40 / EN19 / 42CrMoS4 Steel
708M40, also known as EN19, is a high tensile alloy steel, often hardened or tempered to the ‘T’ condition.
With a combination of good ductility and shock resistance, 708M40 is suitable for applications with very high loading such as engine gear boxes. It is renowned for its wear resistance properties and where high strength properties are required.
Chemical Analysis
| Carbon | 0.36 – 0.44 |
| Silicon | 0.10 – 0.40 |
| Manganese | 0.70 – 1.00 |
| Phosphorous | 0.00 – 0.035 |
| Sulphur | 0.00 – 0.04 |
| Chromium | 0.90 – 1.20 |
| Molybdenum | 0.15 – 0.25 |
Specification Comparison
| BRITISH BS 970:1991 | 708M40 |
| BRITISH BS 970:1955 | EN19 |
| GERMAN DIN | 42CrMo4 |
| FRENCH AFNOR | 42CD4 |
| SWEDISH SS | 2244 |
| AMERICAN SAE | 4140 |
| WERKSTOFF NO. | 1.7225 |
| EUROPEAN STEEL NAME | 42CrMoS4 |
| EUROPEAN STANDARD | EN10277-5 |
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