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NV7 (4140)

Description

NV7 (4140) High Alloy and Mechanical Properties, Chemical Element, Cross Reference, Datasheet.

Datasheet for: Steel Grades:High Alloy: NV7 (4140)
Category Type Steel Grade Standard Country Application
Steel GradesHigh Alloy NV7 (4140)
NV2 (1547)
H15470
NV3
G31410
NV4 (3140)
G31400
NV5 (8645)
H86450
NV6 (5150)
H51500

Chemical composition(mass fraction)(wt.%) of the NV7 (4140)

C
Si
Mn
P
S
Cr Ni
0.37-0.44 0.15-0.35 0.65-1.10 0.035 0.040 0.75-1.20  
Mo Al Cu Nb Ti V Ce
0.15-0.25            
N Co Pb B Other    
             
             

Mechanical Properties of steel grade NV7 (4140)

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)
835 (≥) 438 (≥) 34 12 42 Solution and Aging, Annealing, Ausaging, Q+T,etc 321

Physical Properties of steel grade NV7 (4140)

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
14 - -     0.13 -  
415 696 - 11.3 111   -  
857 - 43 23.2   124 421

Heat Treatment of steel grade NV7 (4140)

Heat treated : 1959°C - 1539°C

Technological Curves of steel grade NV7 (4140)

Cross Reference Table (Equivalent Grade) of NV7 (4140)

Grade Standard Country Application
SAE NV7(4140) SAE USA precipitation hardening
SAE HNV7(71360) SAE USA precipitation hardening

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