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China GBT 25 China structural steel and alloy steel and 25 Mechanical Properties, Chemical Element, Cross Reference, Datasheet.

Datasheet for: Steel Grades:Structure Steel: 25
Category Type Steel Grade Standard Country Application
Steel GradesStructure Steel 25 GBT China China structural steel and alloy steel
Q345GJZ-C
Q345GJZ-D
Q345GJZ-E
08F
10F
15F
8
GBT10
15
20

Chemical composition(mass fraction)(wt.%) of the 25

C(％) Si(％) Mn(％) P(％) S(％) Cr(％) Ni(％) Cu(%)
0.22-0.29 0.17-0.37 0.50-0.80 0.035 0.035 0.25 0.3 0.25

Mechanical Properties of steel grade 25

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)
377 (≥) 758 (≥) 33 12 31 Solution and Aging, Annealing, Ausaging, Q+T,etc 244

Physical Properties of steel grade 25

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
13 - -     0.23 -  
418 415 - 23.3 111   -  
843 - 44 12.2   311 132

Heat Treatment of steel grade 25

Heat treated : 1649°C - 1666°C

Technological Curves of steel grade 25

Cross Reference Table (Equivalent Grade) of 25

Grade Standard Country Application
Q255 A China Engineering and welding
Q255 B China Engineering and welding
H25 ASTM USA Alloy tool steel
T20825 UNS USA Alloy tool steel
CPM Rex 25 AISI USA Powder metallurgy high-speed tool steel
Stellite 25 Stellite alloy
Stellite 250 Stellite alloy
Stellite 251 Stellite alloy
1.1525 DIN Germany Carbon tool steel
C125W DIN Germany Carbon tool steel
1.1625 DIN Germany Carbon tool steel
125Cr1 DIN Germany Cold working alloy tool steel
125Cr2 DIN Germany Cold working alloy tool steel
125CrSi5 DIN Germany Cold working alloy tool steel
1.2510 DIN Germany Cold working alloy tool steel
1.2516 DIN Germany Cold working alloy tool steel
1.2519 DIN Germany Cold working alloy tool steel
1.2542 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
20 30
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