Oil Tempered Spring Steel Wire
Oil tempered wire is widely used for springs that require extremely high resistance to fatigue, heat, and permanent set in fatigue, including the valve springs of the engine, clutch springs, and suspension springs that are considered important security parts of automobiles. Our group’s high-quality oil tempered wire has a large share in both domestic and overseas markets. Our customers choose oil tempered high carbon steel wire for their custom spring and custom wire form manufacturing projects because it is inexpensive, readily available, and easy to work with.
Size Range
.039″ to 1.18″ round/flat wire (1-30mm)
Typical Specifications
- ASTM-A-229 Class I
- ASTM-A-229 Class II
- JIS G3560 / G3561
- DIN 10270
- ISO 8458
- Custom Spec.
Common Trade Names
- 55CrSi
- UNS K07001
- UNS G10650
- ASTM A229
- AISI 1065
- SAE J316T
- 60Si2MnA / 9260H / SUP7 / 56Si7 / 1.5026
- 50CrVA / 6150 / SUP10A /51CrV4 / 1.8159
- 55Cr3 / 5155 / SUP9 / 1.7176
- SAE9254 / 9254V / 60Si2CrA / SUP12 / 54SiCr6 / 1.7102
- 65Mn
Nominal Chemical & Physical Properties
- C: 0.55 – 0.85%
- Mn: 0.60 – 1.20%
- Minimum tensile strength: psi x 103 Class I 165-293, Class II 191-324
- Design stress % minimum tensile: 45
- Modulus of elasticity: psi x 106 30
- Modulus in torsion: psi x 106 11.5
- Maximum operating temperature: 250°F (121°C)
- Rockwell hardness: C42-55
Heat Treating ASTM A 229 Oil Tempered Wire
Oil tempered is delivered in pre-tempered condition. Therefore, no further hardening can be obtained via heat treating. However, depending on the application, springs and wire forms will undergo a stress-relieving process.
Oil tempered wire for springs
| Product | Code | Application |
| Oil tempered carbon steel wire for springs | Type A | SWO-A | Springs mainly receiving static loads |
| Type B | SWO-B | Springs mainly receiving dynamic loads |
| Oil tempered chrome silicon steel wire for springs | SWOSC-B |
Oil tempered wire for Valve spring
| Product | Code | Application |
| Oil tempered carbon steel wire for valve springs | SWO-V | Valve springs for engines
Clutch springs
Other essential springs |
| Oil tempered chrome vanadium steel wire | SWOCV-V |
| Oil tempered chrome silicon steel wire for valve springs | SWOSC-V |
| Oil tempered high-carbon chrome silicon steel wire for valve springs | SWOSC-VH |
| Oil tempered high-carbon chrome silicon vanadium steel wire for valve springs | SWOSC-VHV |
Oil tempered wire for Suspension spring
| Product | Code | Application |
| Oil tempered chrome silicon steel wire for suspension springs | SWOSC-K | Cold formed suspension springs |
| Oil tempered chrome silicon vanadium steel wire for suspension springs | SWOSC-KV |
