SAE NV7(4140) chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of SAE NV7(4140)

SAE SAE NV7(4140)

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This page is mainly introduced the SAE NV7(4140) chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of SAE NV7(4140),such as it is commonly used in bars, sheet,plates, steel coils, steel pipes,forged and other materials application.
SAE NV7(4140)
  • Steel Garde:SAE NV7(4140)
  • Type:Special Alloy
  • Country:USA
  • Standard:SAE
  • Application:precipitation hardening

Chemical composition(mass fraction)(wt.%)

Mechanical Properties

Tensile strength 177~341 σb/MPa
Yield Strength 657 σ 0.2 ≥/MPa
Elongation 15 δ5≥(%)
ψ - ψ≥(%)
Akv - Akv≥/J
HBS 274~078 -
HRC 30 -

Physical Properties

Thermal expansion 24-31 e-6/K
Thermal conductivity 78-56 W/m.K
Specific heat 450-460 J/kg.K
Melting temperature 0554-6783 째C
Density 9529-4557 kg/m3
Resistivity 0.50-0.60 Ohm.mm2/m
     

Heat Treatment Regime

Annealing

Quenching

Tempering

Normalizing

Q & T

Size Availability

Steel Grade Specification Processing range(mm)
SAE NV7(4140) Special Alloy Round Bar and Hollow Bar Φ1 to Φ2000
Square and Flat Steel Φ10 to Φ100
Plate and Sheet 0.08-800(Thickness)*10-1500(Width)*Length
Tube or Pipe OD:Φ4-410; WT:1-35 mm; Lenght:10-12000
Coil and Strip Steel THK:0.1mm Width:1500mm
Forged Ring/Cylindrical/Disk

Technical specification/standard for download