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Q345 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of Q345

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GBT Q345

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This page is mainly introduced the Q345 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of Q345,such as it is commonly used in bars, sheet,plates, steel coils, steel pipes,forged and other materials application.
Q345

Steel Garde:Q345
Type:Special Alloy
Country:China
Standard:GBT
Application:China structural steel and alloy steel

Cross Reference Table(Equivalent Materials):

Material	Standard	Country
Q345q E		China
Q345q C		China
Q345q	GBT	China
Q345q	GBT	China
Q345q	GBT	China
Q345	GBT	China
Q345	GBT	China
Q345	GBT	China
Q345	GBT	China
Q345GNH	GBT	China
Q345GNHL	GBT	China
Q345GJ-C	GBT	China
Q345GJ-D	GBT	China
Q345GJ-E	GBT	China
Q345GJZ-C	GBT	China
Q345GJZ-D	GBT	China
Q345GJZ-E	GBT	China

Chemical composition(mass fraction)(wt.%)

Mechanical Properties

Tensile strength	230～383	σb/MPa
Yield Strength	260	σ 0.2 ≥/MPa
Elongation	14	δ5≥(％)
ψ	-	ψ≥(％)
Akv	-	Akv≥/J
HBS	359～677	-
HRC	30	-

Physical Properties

Thermal expansion	92-90	e-6/K
Thermal conductivity	98-13	W/m.K
Specific heat	450-460	J/kg.K
Melting temperature	2465-2789	째C
Density	4702-3210	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)
Q345 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