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65 75
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Description

China GBT 70 China structural steel and alloy steel and 70 Mechanical Properties, Chemical Element, Cross Reference, Datasheet.

Datasheet for: Steel Grades:Structure Steel: 70
Category Type Steel Grade Standard Country Application
Steel GradesStructure Steel 70 GBT China China structural steel and alloy steel
20
25
30
35
40
45
50
55
60
65

Chemical composition(mass fraction)(wt.%) of the 70

C(％) Si(％) Mn(％) P(％) S(％) Cr(％) Ni(％) Cu(%)
0.67-0.75 0.17-0.37 0.50-0.80 0.035 0.035 0.25 0.3 0.25

Mechanical Properties of steel grade 70

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)
831 (≥) 513 (≥) 13 32 42 Solution and Aging, Annealing, Ausaging, Q+T,etc 442

Physical Properties of steel grade 70

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
34 - -     0.21 -  
912 488 - 13.3 314   -  
249 - 42 43.2   324 243

Heat Treatment of steel grade 70

Heat treated : 1118°C - 1635°C

Technological Curves of steel grade 70

Cross Reference Table (Equivalent Grade) of 70

Grade Standard Country Application
UNS G10170 UNS USA General use carbon steel bar
HAP 70 AISI USA Powder metallurgy high-speed tool steel
C70W1 Germany Carbon tool steel
C70W2 DIN Germany Carbon tool steel
1.2703 DIN Germany Cold working alloy tool steel
1.2709 DIN Germany Cold working alloy tool steel
70Si7 DIN Germany Cold working alloy tool steel
SK70 JIS Japan Carbon tool steel
TC70 JIS Japan Carbon tool steel
SS14:1770 SS Sweden Carbide for cutting tools
SS14:1770 SS Sweden Carbide for cutting tools
SS14:— SS Sweden Carbide for cutting tools
SS14:— SS Sweden Carbide for cutting tools
SS14:2700 SS Sweden Carbide for cutting tools
SS14:2700 SS Sweden Carbide for cutting tools
S14:2705 SS Sweden Carbide for cutting tools
C70U ISO ISO Carbide for cutting tools
C70U ISO ISO Carbide for cutting tools
UNS S15700 UNS USA precipitation hardening
UNS S15700 UNS USA precipitation hardening
65 75
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