1.7034 40X(40KH)

 

This steel most often specified medium-carbon steel. It is used when greater strength and hardness is desired in the as-rolled condition. This respond to heat treatment, and flame and induction hardening, but is not recommended for carburizing treatment. When special practices is employed, weldability is fair. Die forging and hot upsetting of this grade is good to excellent.
 

Standard Designation Grade, Class, Type, Symbol or Name Steel UNS Number Product Form/Heat Treatment Thickness Yield Strength, min Tensile Strength, min Elongation, min, % Other
Number
  t, mm N/mm2 or MPa N/mm2 or MPa
EN 10250-2:1999 C45 1.0503 N or NT ≤ 100 305 580 16
100 < t ≤ 250 275 560 16 18 J at 23°C
250 < t ≤ 500 240 540 16 15 J at 23°C
500 < t ≤ 1000 230 530 15 12 J at 23°C

 

Composition:

 

%C %Si %Mn %P %S %Cr %Mo %Ni other
0,42-0,50 ≤0,40 0,50-0,80 0,035 0,035 ≤0,40 0,10 ≤0,40 Cr+Mo+Ni ≤ 0,63

 
Hot working:

Forging temperature range: 1230-850℃
 
Note: Heat to 1250 ℃. 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 ℃
650-700 207 840-870 820-850 830-860 540-680

 

Main application:

Parts for crushing machines
 
Shape of product:

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