4140

AISI: 4140

 

NF EN 10083 / 06		 42 Cr Mo 4

Former designation		 ≈ 42 CD 4 (NF A 35-552 / 07-86)
 
Chemical
composition
in %
C Si Mn Cr Mo S*
0,38-0,45 0,10-0,40 0,60-0,90 0,90-1,20 0,15-0,30 0,020-0,040
* Target
 
Steel properties
 
Grade of very common use, similar to 34 Cr
Mo 4. Steel grade 42 Cr Mo 4 enables 100 MPa more to be achieved
on the same sections than steel grade 34 Cr Mo 4. Sometimes used
after surface hardening treatment.
 
 
Applications
 
Parts for powertrain, shafts, press
columns, axles of hydraulic jacks, pinions, annular gears,
bolting and screw rods for oil industry.
 
 
Mechanical
properties
 
• condition as supplied,
annealed
Hardness: ≤ 241 HB
• condition as supplied
hardened and tempered
Ø U.T.S. Y.S. 0.2% Elongation KV at 20 °C
mm MPa MPa % J
d ≤ 16 1000-1300 ≥ 900 ≥ 10 ≥ 30
16 < d ≤ 40 1000-1200 ≥ 750 ≥ 11 ≥ 35
40 < d ≤ 100 900-1100 ≥ 650 ≥ 12 ≥ 35
100 < d ≤ 160 800- 950 ≥ 550 ≥ 13 ≥ 35
160 < d ≤ 250 750- 900 ≥ 500 ≥ 14 ≥ 35
250 < d ≤ 500* 690- 840 ≥ 460 ≥ 15 ≥ 38**
500 < d ≤ 750* 590- 740 ≥ 390 ≥ 16 ≥ 38**
* As per SEW 550/08-76
** DVM samples
 
 
Size range
available or from
European central stock, short delivery time
• Round bars
Product designation Ø (min. →
max.)
mm
Ground round bars h7
Length: 3 m		 15 → 80
Rolled or forged round bars, annealed
Length: 4-6 m		 14 → 280
Forged round bars, annealed
Length: 3.6-4 m		 300 → 480
Rolled or
forged round bars, hardened and tempered
Length: 4-6 m		 14 → 930
• Flat bars
Product designation Width (min. → max.)
mm		 Thickness
(min. → max.)
mm
Rolled flat
bars, annealed
Length: 3.6-4 m		 35 → 250 15 → 90
• Square bars
Product designation Dimension
(min. → max.)
mm
Rolled or
forged square bars, annealed
Length: 3.6-4 m		 32 → 250