1.6511 40NiCrMo7


This grade is a medium-carbon, constructional, special steel, can be nitrided to improve wear and galling resistance or fatigue properties. This steel does not age harden. Core properties of 1.6511 is limited to those which, preceding nitriding, is produced by conventional quenching and tempering. Case hardness lower than the nickel-aluminum steel may be developed, depending on prior heat treatment and nitriding cycle. This grade is available as aircraft quality parts; forging stock; 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