70Mn steel wire
Chemical Compositions
|
Grade
|
(C)%
|
(Si)%
|
(Mn)%
|
(P)%
|
(S)%
|
(Cr)%
|
(Ni) %
|
(Cu) %
|
|
70Mn
|
0.67-0.75
|
0.17-0.37
|
0.90-1.20
|
≤0.035
|
≤0.035
|
≤0.25
|
≤0.30
|
≤0.25
|
|
70Mn A
|
0.67-0.75
|
0.17-0.37
|
0.90-1.20
|
≤0.030
|
≤0.030
|
≤0.25
|
≤0.30
|
≤0.25
|
|
70Mn E
|
0.67-0.75
|
0.17-0.37
|
0.90-1.20
|
≤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
|
|
70Mn
|
450
|
785
|
8
|
30
|
HBS10/3000
no heat treatment≤285
annealing≤229
|
grade Comparison
|
China
GB YB
|
American
ASTM
|
Japan
JIS
|
Germany
DIN EN
|
UK
BS EN
|
French
NF EN
|
Russian
rOCT
|
|
70Mn
|
1572
|
SWRH72B
|
-
|
70T
|
||
70Mn
similar performance with 70 steel ,but slightly higher hardenability, heat treatment strength, hardness, elasticity than 70 steel is good, but easy to decarburization and the formation of cracks when the tendency of water, cold plastic deformation ability, poor welding, a hot and sensitive tendency to temper brittleness
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Key words：70Mn steel wire steel wire
[Source：Original]
[Author：web]
[Date：09-01-13]
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