1.6511 40NiCrMo7



This grade is a medium-carbon, constructional, alloy steel, can be nitrided to improve galling and wear resistance or fatigue properties. This steel cannot age hardening. Core properties of 1.6511 is limited to this which, preceding nitriding, are produced by conventional quenching and tempering. Case hardness lower than the nickel-aluminum steels may be developed, depending on prior heat treatment and nitriding cycle. 1.6511 steel is available as aircraft quality parts; forging parts; hot worked and cold finished bar, rod, and wire; and seamless mechanical tubing.




%C %Si %Mn %P %S Cr Mo Ni other
0,32-0,40 ≤0,40 0,50-0,80 0,035 0,035 0,90-1,20 0,15-0,30 0,90-1,20  


Hot working:

Forging temperature range: 1100-850℃

Note: Heat to 1200 ℃. Do not forge below 850.

Heat treatment:

Soft annealing ℃ HB 30-soft annealed Normalizing ℃ Hardening temperature for quenching in Water ℃ Hardening temperature for quenching in Oil ℃ Tempering temperature ℃
650-700 248 850-880 820-850 830-860 540-680


Main application:

Axles, axle arms, connecting rods, arbors

Shape of product:

Round, flat, step shape, ring, disc, shaft, other shape depend on customer needs