Available Shapes
817M40 Alloy Steel
EN24/817M40 steel is a common nickel-molybdenum alloy steel according to BS standard. It is high-strength steel and has good comprehensive mechanical properties. EN24/817M40 steel is usually supplied in the final heat-treated condition which is widely used in the manufacture of the camshaft and connecting rod of engine parts, poor processability, belongs to the typical difficult-to-machine materials.
Applications
Analysis
Flat Bar
Forging
Annealing
Stress Relieving
Hardening
Applications
Analysis
| Carbon | 0.36-0.44% | Nickel | 1.30-1.70% |
| Manganese | 0.45-0.70% | Chromium | 1.00-1.40% |
| Silicon | 0.10-0.35% | Molybdenum | 0.20-0.35% |
| Phosphorous | 0.035% max | ||
| Sulphur | 0.040% max |
Flat Bar
817M40T flat bar is available cut from large rectangular block, pieces can be sawn to your specific sizes.
Forging
Preheat the steel carefully, then raise temperature to 1000-1100°C for forging. Do not forge below 850°C. After forging this alloy steel, cool slowly preferably in a furnace.
Annealing
Heat the 817M40T slowly to 840-860°C, soak well and allow to cool with the furnace to 580°C, before withdrawing.
Stress Relieving
When parts are heavily machined, ground or otherwise subject to cold work, stress relieving will be beneficial prior to hardening. Heat carefully to 650-670°C, soak well before cooling in the furnace or in the air.
Hardening
817M40T is commonly supplied ready heat treated. If further heat treatment is required annealed 817M40 should be heated slowly to 830-850°C and after adequate soaking at this temperature quench in oil. Temper as soon as tools reach room temperature. Hardening from a neutral salt bath, will reduce the possibility of scaling or decarburisation. Heat to 830-850°C and after equalisation quench in oil.
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