70 steel wire
Chemical Compositions
|
grade
|
(C)%
|
(Si)%
|
(Mn)%
|
(P)%
|
(S)%
|
(Cr)%
|
(Ni) %
|
(Cu) %
|
|
70
|
0.67-0.75
|
0.17-0.37
|
0.50-0.80
|
≤0.035
|
≤0.035
|
≤0.25
|
≤0.30
|
≤0.25
|
|
70A
|
0.67-0.75
|
0.17-0.37
|
0.50-0.80
|
≤0.030
|
≤0.030
|
≤0.25
|
≤0.30
|
≤0.25
|
|
70E
|
0.67-0.75
|
0.17-0.37
|
0.50-0.80
|
≤0.025
|
≤0.020
|
≤0.25
|
≤0.30
|
≤0.25
|
physical properties
|
Grade
|
yield point MPa (≥)
|
tensile strength
σb /MPa (≥)
|
Elongation
δ5 / % (≥)
|
reduction of area
ψ/ % (≥)
|
hardness
|
|
70
|
-
|
1080-1255
|
9
|
30
|
HBS10/3000
No heat treatment ≤269
annealing≤229
|
grade Comparison
|
China
GB YB
|
American
ASTM
|
Japan
JIS
|
Germany
DIN EN
|
UK
BS EN
|
French
NF EN
|
Russian
rOCT
|
|
70
|
1070
|
SWRH72A
SWRH72B
|
C70D(1.0615)
|
70
|
||
Characteristics and uses of 70 steel
70 steel Heat or cold after the hardware of high strength and flexibility, cold plastic deformation is low, good hardenability, dynamic loading and fatigue load bearing capacity of the low. For the working temperature is not high, the larger size springs, such as cars, tractors, railway vehicles and general machinery springs, etc.
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[Source：Original]
[Author：web]
[Date：09-01-13]
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