Q420 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of Q420

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GBT Q420

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This page is mainly introduced the Q420 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of Q420,such as it is commonly used in bars, sheet,plates, steel coils, steel pipes,forged and other materials application.
Q420
  • Steel Garde:Q420
  • Type:Special Alloy
  • Country:China
  • Standard:GBT
  • Application:China structural steel and alloy steel

Cross Reference Table(Equivalent Materials):

Material Standard Country
Q420q GBT China
Q420q GBT China
Q420q GBT China
Q420 GBT China
Q420 GBT China
Q420 GBT China
Q420 GBT China
Q420 GBT China
Q420 GBT China
Q420 GBT China

Chemical composition(mass fraction)(wt.%)

Mechanical Properties

Tensile strength 008~266 σb/MPa
Yield Strength 188 σ 0.2 ≥/MPa
Elongation 86 δ5≥(%)
ψ - ψ≥(%)
Akv - Akv≥/J
HBS 047~729 -
HRC 30 -

Physical Properties

Thermal expansion 46-32 e-6/K
Thermal conductivity 24-15 W/m.K
Specific heat 450-460 J/kg.K
Melting temperature 5646-2345 째C
Density 6671-2732 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)
Q420 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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