Available Shapes
905M39 Nitriding Steel
905M39 is a chromium-aluminiummolybdenum engineering steel which is suitable for nitriding and once nitrided, offers a hard-wearing casing which is superior to EN40B. 905M39 offers an excellent overall combination of wear and abrasion resistance. With high toughness and ductility, 905M39 nitriding steel is used in the manufacture of die casting dies, clutch plates and shackle pins. 905M39 in the ‘R’ condition offers a tensile of 700-850 N/mm² whilst 905M39 in the ’S’ condition offers a tensile of 775-925 N/mm². Wear resistance after nitriding is 68HRc which is higher than EN40B
Applications
Analysis
Annealing
Hardening
Tempering
Typical Mechanical Properties*
Heat Treatment
Applications
905M39 is supplied in the ‘R’ and ‘S’ condition. Commercial application examples include: Hydraulic cylinders Gears & pinions Die inserts, piston pins, cams Valve and gate parts Clutch plates, plates used in brick pressies Connecting rods, die casting dies Rollers and ball joints
Analysis
| Carbon | 0.35-0.43% | Chromium | 1.40-1.80% |
| Manganese | 0.40-0.65% | Molybdenum | 0.15-0.25% |
| Silicon | 0.10-0.40% | Phosphorous | 0.025% max |
| Aluminium | 0.90-1.30% | Sulphur | 0.025% max |
Annealing
Heat the steel slowly to 650-700°C. Cool in air.
Hardening
905M39 is supplied ready heat treated. If further heat treatment is required annealed 905M39 should be heated slowly to 870-930°C and after adequate soaking at this temperature quench in oil/polymer or water. Temper as soon as tools reach room temperature.
Tempering
Heat the 905M39 carefully to a suitable temperature selected by reference to a tempering chart or table (usually between 580-700°C), soak at the temperature for two hours per 25mm of ruling section, then allow to cool in the air.
Typical Mechanical Properties*
Heat the 905M39 carefully to a suitable temperature selected by reference to a tempering chart or table (usually between 580-700°C), soak at the temperature for two hours per 25mm of ruling section, then allow to cool in the air.
Heat Treatment
Heat treatment temperatures, including rate of heating, cooling and soaking times will vary due to factors such as the shape and size of each steel component. Other considerations during the heat treatment process include the type of furnace, quenching medium and work piece transfer facilities. Please consult your heat treatment provider for full guidance on heat treatment of 905M39 alloy steel.
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