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Description

China GBT 55 China structural steel and alloy steel and 55 Mechanical Properties, Chemical Element, Cross Reference, Datasheet.

Datasheet for: Steel Grades:Structure Steel: 55
Category Type Steel Grade Standard Country Application
Steel GradesStructure Steel 55 GBT China China structural steel and alloy steel
8
GBT10
15
20
25
30
35
40
45
50

Chemical composition(mass fraction)(wt.%) of the 55

C(％) Si(％) Mn(％) P(％) S(％) Cr(％) Ni(％) Cu(%)
0.52-0.60 0.17-0.37 0.50-0.80 0.035 0.035 0.25 0.3 0.25

Mechanical Properties of steel grade 55

Yield
Rp0.2 (MPa)		 Tensile
Rm (MPa)		 Impact
KV/Ku (J)		 Elongation
A (%)		 Reduction in cross section on fracture
Z (%)		 As-Heat-Treated Condition Brinell hardness (HBW)
813 (≥) 436 (≥) 42 22 13 Solution and Aging, Annealing, Ausaging, Q+T,etc 422

Physical Properties of steel grade 55

Temperature
(°C)		 Modulus of elasticity
(GPa)		 Mean coefficient of thermal expansion 10-6/(°C) between 20(°C) and Thermal conductivity
(W/m·°C)		 Specific thermal capacity
(J/kg·°C)		 Specific electrical resistivity
(Ω mm²/m)		 Density
(kg/dm³)		 Poisson’s coefficient, ν
31 - -     0.41 -  
325 389 - 14.3 344   -  
855 - 24 13.2   212 143

Heat Treatment of steel grade 55

Heat treated : 1885°C - 1525°C

Technological Curves of steel grade 55

Cross Reference Table (Equivalent Grade) of 55

Grade Standard Country Application
Q255 A China Engineering and welding
Q255 B China Engineering and welding
SM55 China Plastic mould with flat steel
1.1554 DIN Germany Carbon tool steel
C55W DIN Germany Carbon tool steel
X155CrVMo12-1 DIN Germany Cold working alloy tool steel
1.2550 DIN Germany Cold working alloy tool steel
1.2552 DIN Germany Cold working alloy tool steel
55NiCrMoV6 DIN Germany Cold working alloy tool steel
55NiCr10 DIN Germany Cold working alloy tool steel
1.3255 DIN Germany High-speed tool steel
1.3355 DIN Germany High-speed tool steel
SKH55 JIS Japan W-phase system high-speed tool steel
55CrNiMoV 4 AFNOR France Carbide for cutting tools
55CrNiMoV 4 AFNOR France Carbide for cutting tools
55NiCrMoV7 AFNOR France Carbide for cutting tools
55NiCrMoV7 AFNOR France Carbide for cutting tools
SS14:2550 SS Sweden Carbide for cutting tools
32CrMoV12-28 ISO ISO Carbide for cutting tools
32CrMoV12-28 ISO ISO Carbide for cutting tools
50 60
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Jiangyou Longhai Special Steel Co.,Ltd.

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