40 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of 40

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GBT 40

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This page is mainly introduced the 40 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of 40,such as it is commonly used in bars, sheet,plates, steel coils, steel pipes,forged and other materials application.
40
  • Steel Garde:40
  • Type:Special Alloy
  • Country:China
  • Standard:GBT
  • Application:China structural steel and alloy steel

Chemical composition(mass fraction)(wt.%)

Mechanical Properties

Tensile strength 171~590 σb/MPa
Yield Strength 142 σ 0.2 ≥/MPa
Elongation 91 δ5≥(%)
ψ - ψ≥(%)
Akv - Akv≥/J
HBS 637~350 -
HRC 30 -

Physical Properties

Thermal expansion 81-56 e-6/K
Thermal conductivity 37-78 W/m.K
Specific heat 450-460 J/kg.K
Melting temperature 1779-7591 째C
Density 1009-3785 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)
40 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

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