Available Shapes
EN41 Nitriding Steel
En41B Alloy Steel is chromium-aluminum-molybdenum nitriding steel usually supplied in hardened and tempered conditions. It is also called nitrating steel. In nitrating treatment, it is hardened to a certain depth according to the application to improve the wear resistance and improve the impact load on the material. EN40B.
Applications
Analysis
Annealing
Hardening
Tempering
Typical Mechanical Properties*
Heat Treatment
Applications
Typical applications include connecting rods, extruders, valve stems, dies, ring & plunger, Screw and barrel for injection moulding machines
Analysis
| Carbon | 0.35-0.45% | Manganese | 0.65% max |
| Silicon | 0.10-0.45% | Nickel | 0.40% max |
| Chromium | 1.40-1.80% | Phosphorous | 0.05% max |
| Molybdenum | 0.10-0.25% | Sulphur | 0.05% max |
| Aluminium | 0.90-1.30% |
Annealing
Heat slowly to 650-700°C. Cool in air.
Hardening
EN41 is supplied ready heat treated. If further heat treatment is required annealed EN41 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 carefully to a suitable temperature selected by reference to a tempering chart or table (usually between 580-700°C). Soak at the temperature for 2 hours per 25mm of ruling section, then allow to cool in the air.
Typical Mechanical Properties*
| Condition | Tensile N/mm² | Yield N/mm² | Elongation % | Izod KCV J | Hardness Brinell |
|---|---|---|---|---|---|
| R | 700-850 | 525 | 17 | 50 | 201-255 |
| S | 775-925 | 585 | 15 | 50 | 223-277 |
(*subject to ruling section)
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 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 EN41 alloy nitriding steel.
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