AISI 4340 AISI 4340 Datasheet
Category Type Steel Grade Standard Country Application
Steel GradesCarbon Steel AISI 4340
SAE 43BV14
SAE 4317
AISI 4320
SAE 4320
UNS G43200
AISI 4337
SAE 4337
UNS G43370
AISI E4337
UNS G43376
Datasheet for:Steel Grades:Carbon Steel:AISI 4340

Chemical composition(mass fraction)(wt.%) of the AISI 4340

C
Si
Mn
P
S
Cr Ni
 0.38-0.43 0.15-0.35  0.6-0.8 0.035  0.04  0.7-0.9  1.65-2.0 
Mo Al Cu Nb Ti V Ce
0.2-0.3             
N Co Pb B Other    
             
             

Mechanical properties / Mechanische Eigenschaften / Caracteristiques mecaniques of grade AISI 4340

Yield
Rp0.2 (MPa)
Tensile
Rm (MPa)
Impact
KV/Ku (J)
Elongation
A (%)
Reduction in cross section on fracture
Z (%)
As-Heat-Treated Condition Brinell hardness (HBW)
929 (≥) 472 (≥) 14 44 31 Solution and Aging, Annealing, Ausaging, Q+T,etc 311
Temperature
(°C)
Modulus of elasticity
(GPa)
Mean coefficient of thermal expansion 10-6/(°C) between 20(°C) and Thermal conductivity
(W/m·°C)
Specific thermal capacity
(J/kg·°C)
Specific electrical resistivity
(Ω mm²/m)
Density
(kg/dm³)
Poisson’s coefficient, ν
44 - -     0.21 -  
917 616 - 22.3 142   -  
981 - 22 12.2   323 143
Heat treated : 1984°C - 1148°C
Directory is being updated.
The material does not have direct Metallography properties.
Directory is being updated.
The material does not have direct Metallography properties.
Directory is being updated.
Cross Reference Table(Equivalent Grade)
Grade Standard Country Application
A-2
Applied to the thermosetting plastic mold, the hardened mould as a whole
A 240 S43400
Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications
A 554 S43400
Welded Stainless Steel Mechanical Tubing
S43400
Ferritic Chromium Molybdenum Stainless Steel
SA-240 S43400
Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications
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