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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	579～485	σb/MPa
Yield Strength	414	σ 0.2 ≥/MPa
Elongation	76	δ5≥(％)
ψ	-	ψ≥(％)
Akv	-	Akv≥/J
HBS	229～775	-
HRC	30	-

Physical Properties

Thermal expansion	65-14	e-6/K
Thermal conductivity	30-39	W/m.K
Specific heat	450-460	J/kg.K
Melting temperature	1075-5545	째C
Density	4410-9574	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