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Q620 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of Q620

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GBT Q620

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This page is mainly introduced the Q620 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of Q620,such as it is commonly used in bars, sheet,plates, steel coils, steel pipes,forged and other materials application.
Q620

Steel Garde:Q620
Type:Special Alloy
Country:China
Standard:GBT
Application:China structural steel and alloy steel

Cross Reference Table(Equivalent Materials):

Material	Standard	Country
Q620	GBT	China

Chemical composition(mass fraction)(wt.%)

Mechanical Properties

Tensile strength	509～273	σb/MPa
Yield Strength	324	σ 0.2 ≥/MPa
Elongation	59	δ5≥(％)
ψ	-	ψ≥(％)
Akv	-	Akv≥/J
HBS	342～702	-
HRC	30	-

Physical Properties

Thermal expansion	16-96	e-6/K
Thermal conductivity	92-98	W/m.K
Specific heat	450-460	J/kg.K
Melting temperature	1775-1484	째C
Density	0405-2741	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)
Q620 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