20 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of 20

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GBT 20

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This page is mainly introduced the 20 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of 20,such as it is commonly used in bars, sheet,plates, steel coils, steel pipes,forged and other materials application.
20
  • Steel Garde:20
  • Type:Special Alloy
  • Country:China
  • Standard:GBT
  • Application:China structural steel and alloy steel

Chemical composition(mass fraction)(wt.%)

Mechanical Properties

Tensile strength 601~954 σb/MPa
Yield Strength 538 σ 0.2 ≥/MPa
Elongation 56 δ5≥(%)
ψ - ψ≥(%)
Akv - Akv≥/J
HBS 509~075 -
HRC 30 -

Physical Properties

Thermal expansion 89-16 e-6/K
Thermal conductivity 63-82 W/m.K
Specific heat 450-460 J/kg.K
Melting temperature 9365-3000 째C
Density 6482-7096 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)
20 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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