Steel Wires - Spring
Wire
Austenitic stainless steel has a several excellent characteristics as follows.
- Prominent resistance to corrosion, dispensing with rust preventive plating.
- Very strong even when exposed to heat, which makes it an ideal material
for heat-resistant spring.
- Non-magnetic or slightly magnetic is suitable for use in electrical appliances.
Type 302, 304 is most popular Austenitic stainless steel used for manufacture
of spring because of its outstanding mechanical properties and corrosion resistance.
Type 316 is used for required high corrosion resistance and non-magnetic property,
but ist mechanical properties are inferior to those of type 302, 304.
Type of steel
|
Type
|
Chemical composition(%)
|
|
AISI
|
SUS
|
C
|
Si
|
Mn
|
P
|
S
|
Ni
|
Cr
|
Others
|
|
302
|
302
|
0.15max
|
1.00max
|
2.00max
|
0.045max
|
0.030max
|
8.00-10.00
|
17.00-19.00
|
-
|
|
304
|
304
|
0.08max
|
1.00max
|
2.00max
|
0.045max
|
0.030max
|
8.00-10.50
|
18.00-20.00
|
-
|
|
316
|
316
|
0.08max
|
1.00max
|
2.00max
|
0.045max
|
0.030max
|
10.00-14.00
|
16.00-18.00
|
Mo 2.00-3.00
|
|
(631)
|
631J1
|
0.09ma
|
1.00max
|
1.00max
|
0.040max
|
0.030max
|
7.00-8.50
|
16.00-18.00
|
Al 0.75-1.50
|
Type of surface
|
Class
|
Type
|
Symbol
|
Diameter(mm)
|
Surface
|
|
AISI
|
SUS
|
|
Austenite
|
302
|
304
|
WPA
|
0.2~5.0
|
Bright
S-Co
Ni-Co
|
|
304
|
304
|
|
316
|
316
|
|
302
|
304
|
WPB
|
0.2~5.0
|
Bright
S-Co
Ni-Co
|
|
304
|
304
|
|
631
|
631J1
|
WPC
|
0.2~5.0
|
S-Co
|
Low-temperature tempering
When stainless steel springs are tempered at low temperature after coiling,
their elastic limit rises and spring characteristic are improved. The best condition
for tempering stainless steel spring is 400°C(752°F) for 30 minutes.
Mechanical Properties
|
Dia(mm)
|
Tensile Strength
|
|
Class A
|
Class B
|
Class C
|
|
AISI/SUS
302.304.316
|
AISI/SUS
302.304
|
AISI/SUS
631
|
|
0.080
0.090
|
1,650~1,900
|
2,150~2,400
|
-
|
|
0.10
0.12
0.14
0.16
0.18
0.20
|
1,950~2,200
|
|
0.23
0.26
0.29
0.32
0.35
0.40
|
1,600~1,850
|
2,050~2,300
|
1,930~2,180
|
|
0.45
0.50
0.55
0.60
|
1,950~2,200
|
1,850~2,100
|
|
0.65
0.70
0.80
0.90
1.00
|
1,530~1,780
|
1,850~2,100
|
1,800~2,050
|
|
1.20
1.40
|
1,450~1,700
|
1,750~2,000
|
1,700~1,950
|
|
1.60
1.80
2.00
|
1,400~1,650
|
1,650~1,900
|
1,600~1,850
|
|
2.30
2.60
|
1,320~1,570
|
1,550~1,800
|
1,500~1,750
|
|
2.90
3.20
3.50
4.00
|
1,230~1,480
|
1,450~1,700
|
1,400~1,650
|
|
4.50
5.00
5.50
6.00
|
1,100~1,350
|
1,350~1,600
|
1,300~1,550
|
|
6.50
7.00
8.00
|
1,000~1,250
|
1,270~1,520
|
-
|
|
9.00
|
-
|
1,130~1,370
|
|
10.0
|
980 ~1,230
|
|
12.0
|
880~1,130
|
|
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