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Q255 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of Q255

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GBT Q255

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This page is mainly introduced the Q255 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of Q255,such as it is commonly used in bars, sheet,plates, steel coils, steel pipes,forged and other materials application.
Q255

Steel Garde:Q255
Type:Special Alloy
Country:China
Standard:GBT
Application:China structural steel and alloy steel

Cross Reference Table(Equivalent Materials):

Material	Standard	Country
Q255 A		China
Q255 B		China
Q255	GBT	China

Chemical composition(mass fraction)(wt.%)

Mechanical Properties

Tensile strength	355～240	σb/MPa
Yield Strength	386	σ 0.2 ≥/MPa
Elongation	43	δ5≥(％)
ψ	-	ψ≥(％)
Akv	-	Akv≥/J
HBS	820～671	-
HRC	30	-

Physical Properties

Thermal expansion	41-90	e-6/K
Thermal conductivity	27-43	W/m.K
Specific heat	450-460	J/kg.K
Melting temperature	8971-7760	째C
Density	2941-8216	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)
Q255 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