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China GBT 30 China structural steel and alloy steel and 30 Mechanical Properties, Chemical Element, Cross Reference, Datasheet.

Datasheet for: Steel Grades:Structure Steel: 30
Category Type Steel Grade Standard Country Application
Steel GradesStructure Steel 30 GBT China China structural steel and alloy steel
Q345GJZ-D
Q345GJZ-E
08F
10F
15F
8
GBT10
15
20
25

Chemical composition(mass fraction)(wt.%) of the 30

C(％) Si(％) Mn(％) P(％) S(％) Cr(％) Ni(％) Cu(%)
0.27-0.34 0.17-0.37 0.50-0.80 0.035 0.035 0.25 0.3 0.25

Mechanical Properties of steel grade 30

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)
825 (≥) 163 (≥) 21 32 31 Solution and Aging, Annealing, Ausaging, Q+T,etc 333

Physical Properties of steel grade 30

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
12 - -     0.31 -  
536 622 - 13.3 113   -  
832 - 14 13.2   411 233

Heat Treatment of steel grade 30

Heat treated : 1969°C - 1549°C

Technological Curves of steel grade 30

Cross Reference Table (Equivalent Grade) of 30

Grade Standard Country Application
ASTM 1030 ASTM USA General use carbon steel bar
UNS G10300 UNS USA General use carbon steel bar
UNS G10130 UNS USA General use carbon steel bar
UNS T72301 UNS USA Carbon tool steel
W2-A ASTM USA Carbon tool steel
UNS T72302 UNS USA Carbon tool steel
T72305 UNS USA Carbon tool steel
T30102 UNS USA Alloy tool steel
T30103 UNS USA Alloy tool steel
T30104 UNS USA Alloy tool steel
T30105 UNS USA Alloy tool steel
T30106 UNS USA Alloy tool steel
T30107 UNS USA Alloy tool steel
T30108 UNS USA Alloy tool steel
T30109 UNS USA Alloy tool steel
T30110 UNS USA Alloy tool steel
T30403 UNS USA Alloy tool steel
T30404 ASTM USA Alloy tool steel
T30405 UNS USA Alloy tool steel
T30407 UNS USA Alloy tool steel
25 35
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