EN41B NITRIDING STEEL / 41CrAlMo7 / DIN1.8509

EN41B is a chromium aluminium molybdenum steel specification usually supplied in the hardened and tempered ‘R’ or ‘S’ condition. EN41 ‘R’ condition has a tensile of 700-850 N/mm². EN41’S’ condition has a tensile of 775-925 N/mm². It offers high wear resistant properties together with toughness and ductility. It is defined by its suitability for nitriding from which EN41B can give a hard wear resistant case up to 68HRc, better than achievable with the similar nitriding grade EN40B.
Applications
EN41B is suited for applications that required excellent resistance to wear and abrasion. Typical applications include connecting rods, small extruders, valve stems, dies. It is widely used in the automotive, textile and general engineering industries. Suitable for applications requiring a resistance to wear, it is also suitable for other applications such as brick press plates, clutch plates, gudgeon, track and shackle pins.
Annealing
Heat slowly to 650-700°C. Cool in air.
Hardening
EN41B 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.
EN 41B NITRIDING STEEL ALLOYRA