GBT 55

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55 Profile
55 Chemical composition
55 Mechanical Properties
55 Physical Properties
55 Heat treatment
55 Size Availability
55 Relevant products

Profile

This page is mainly introduced the 55 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of 55,such as it is commonly used in bars, sheet,plates, steel coils, steel pipes,forged and other materials application.
55

Steel Garde:55
Type:Special Alloy
Country:China
Standard:GBT
Application:China structural steel and alloy steel

Relevant products:

T30402/X155CrVMo12...

422(UNS S42200, ...

1.2714(L6, 55NiCr...

S32550 Stainless...

422 Stainless Steel Round Bar

D2(Cr12Mo1V1) Hot Rolled Plate

Cross Reference Table(Equivalent Materials):

Material	Standard	Country
Q255 A		China
Q255 B		China
SM55		China
1.1554	DIN	Germany
C55W	DIN	Germany
X155CrVMo12-1	DIN	Germany
1.2550	DIN	Germany
1.2552	DIN	Germany
55NiCrMoV6	DIN	Germany
55NiCr10	DIN	Germany
1.2714	DIN	Germany
1.3255	DIN	Germany
1.3355	DIN	Germany
SKH55	JIS	Japan
55CrNiMoV 4	AFNOR	France
55CrNiMoV 4	AFNOR	France
55NiCrMoV7	AFNOR	France
55NiCrMoV7	AFNOR	France
SS14:2550	SS	Sweden
32CrMoV12-28	ISO	ISO
32CrMoV12-28	ISO	ISO
HS4-1	ISO	ISO
HS4-1	ISO	ISO
UNS S15500	UNS	USA
AISI S15500	AISI	USA
UNS S35500	UNS	USA
UNS S35500	UNS	USA
UNS S45500	UNS	USA
UNS S45500	UNS	USA
UNS S45503	UNS	USA
UNS S45503	UNS	USA
S32550	UNS	USA
S32550	UNS	USA
erralium255	UNS	USA
erralium255	UNS	USA
S15500	UNS	USA
S15500	UNS	USA
AM-355(Type634)	UNS	USA
AM-355(Type634)	UNS	USA
S35500	UNS	USA
S35500	UNS	USA
Custom455(XM-16)	UNS	USA
Custom455(XM-16)	UNS	USA
S45500	UNS	USA
S45500	UNS	USA
UNS R30155	UNS	USA
W-Nr 1.4550	DIN	Germany
W-Nr 1.4558	DIN	Germany
X55CrMnNiN20-8	DIN	Germany
2.4955	FED	Germany

Chemical composition(mass fraction)(wt.%)

Mechanical Properties

Tensile strength	250～367	σb/MPa
Yield Strength	804	σ 0.2 ≥/MPa
Elongation	80	δ5≥(％)
ψ	-	ψ≥(％)
Akv	-	Akv≥/J
HBS	173～412	-
HRC	30	-

Physical Properties

Thermal expansion	65-45	e-6/K
Thermal conductivity	28-11	W/m.K
Specific heat	450-460	J/kg.K
Melting temperature	4052-4722	째C
Density	4885-1773	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)
55 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