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905M39 34CrAlMo5 1.8507 EN41B Nitriding Steel Forged Bar

905M39 34CrAlMo5 1.8507 EN41B Nitriding Steel Forged Bar


As a chromium aluminium molybdenum steel 905M39 Nitriding Steel is usually supplied in the hardened and tempered ‘R’ or ‘S’ condition. ‘R’ condition has a tensile of 700-850 N/mm² and ’S’ condition has a tensile of 775-925 N/mm². Properties of the steel combine high wear resistance together with toughness and ductility. It is defined by its suitability for nitriding from which 905M39 can give a hard wear resistant case up to 68HRc.


Suitable for applications requiring excellent resistance to wear and abrasion. Typical applications include connecting rods, small extruders, valve stems, Injection Moulding Equipment, Hydraulic Cylinders, Gears And Pinions, Die Inserts, Valve And Gate Parts, Cams, Piston Pins, etc. 905M39 Nitriding steel is widely used in the automotive, textile and general engineering industries. With its resistance to wear 905M39 is used in other applications such as brick press plates, clutch plates, gudgeon, track and shackle pins.

All Grades Comparison:

41CrAlMo74 38CrMoAl 905M39/905M31 41CrAlMo7/34CrAlMo5 38X2MЮA(38XMЮA) 40CAD6.12/30CAD6.12

Sizes Range:

Dia80mm-800mm, Length: 3000mm-12000mm

Chemical Composition(%):

C Mn Si P S Cr Mo Al Ni Cu
0.35-0.43 0.40-0.65 0.10-0.40 0.025 max 0.025 max 1.40-1.80 0.15-0.25 0.90-1.30 0.03 max 0.03 max

Mechanical Properties:

Condition Tensile Strength Rm (Mpa) Yield Strength Rp0.2 (Mpa) Fracture elongation A5 (%) Notch impact energy ISO-V [J] Hardness (HB)
R 700-850 480 min 16 min 28 min 201-255
S 775-925 525 min 14 min 16 min 223-277


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.
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.
Annealing: Heat the steel slowly to 650-700°C. Cool in air.


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