Q690 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of Q690

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GBT Q690

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This page is mainly introduced the Q690 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of Q690,such as it is commonly used in bars, sheet,plates, steel coils, steel pipes,forged and other materials application.
Q690
  • Steel Garde:Q690
  • Type:Special Alloy
  • Country:China
  • Standard:GBT
  • Application:China structural steel and alloy steel

Cross Reference Table(Equivalent Materials):

Material Standard Country
Q690 GBT China

Chemical composition(mass fraction)(wt.%)

Mechanical Properties

Tensile strength 311~945 σb/MPa
Yield Strength 906 σ 0.2 ≥/MPa
Elongation 71 δ5≥(%)
ψ - ψ≥(%)
Akv - Akv≥/J
HBS 487~313 -
HRC 30 -

Physical Properties

Thermal expansion 38-70 e-6/K
Thermal conductivity 71-39 W/m.K
Specific heat 450-460 J/kg.K
Melting temperature 3828-9858 째C
Density 5339-5627 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)
Q690 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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