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China GBT 20 China structural steel and alloy steel and 20 Mechanical Properties, Chemical Element, Cross Reference, Datasheet.

Datasheet for: Steel Grades:Structure Steel: 20
Category Type Steel Grade Standard Country Application
Steel GradesStructure Steel 20 GBT China China structural steel and alloy steel
Q235GJZ-E
Q345GJZ-C
Q345GJZ-D
Q345GJZ-E
08F
10F
15F
8
GBT10
15

Chemical composition(mass fraction)(wt.%) of the 20

C(％) Si(％) Mn(％) P(％) S(％) Cr(％) Ni(％) Cu(%)
0.17-0.23 0.17-0.37 0.35-0.65 0.035 0.035 0.25 0.3 0.25

Mechanical Properties of steel grade 20

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)
997 (≥) 255 (≥) 44 14 23 Solution and Aging, Annealing, Ausaging, Q+T,etc 412

Physical Properties of steel grade 20

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 - -     0.43 -  
898 987 - 23.3 122   -  
652 - 33 24.2   322 431

Heat Treatment of steel grade 20

Heat treated : 1498°C - 1219°C

Technological Curves of steel grade 20

Cross Reference Table (Equivalent Grade) of 20

Grade Standard Country Application
UNS G10120 UNS USA General use carbon steel bar
ASTM 1020 ASTM USA General use carbon steel bar
UNS G10200 UNS USA General use carbon steel bar
T20811 UNS USA Alloy tool steel
T20810 UNS USA Alloy tool steel
T20812 UNS USA Alloy tool steel
H13 ASTM USA Alloy tool steel
T20813 UNS USA Alloy tool steel
T20814 UNS USA Alloy tool steel
T20819 UNS USA Alloy tool steel
T20821 UNS USA Alloy tool steel
T20822 UNS USA Alloy tool steel
H23 ASTM USA Alloy tool steel
T20823 UNS USA Alloy tool steel
T20824 UNS USA Alloy tool steel
T20825 UNS USA Alloy tool steel
T20826 UNS USA Alloy tool steel
T20841 UNS USA Alloy tool steel
T20842 UNS USA Alloy tool steel
T20843 UNS USA Alloy tool steel
15 25
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