The material used for manufacture of springs is as per BIS:4454 Part-1 – Gr.2. For the procurement of raw material High Carbon Spring Steel Wire, we are associated for the last about 36 years with M/S TATA SSL Ltd., which is the only reliable product availability source in India for the manufacture of all above type of springs. And for locally drawn commercial quality springs, we procure High Carbon Wire Rod from M/S USHA MARTIN Ltd. For satisfaction of customers and for the sake of guarantee, the springs manufactured from wire are stamped duly engraved on the hook.
The Wire chemical composition and physical testing is as hereunder. The test results of wire & wire rod are invariably obtained from the source supplier M/S TATA SSL Ltd. & M/S USHA MARTIN LTD.
| C | 0.71/0.75 |
|---|---|
| Mn | 0.80 Max |
| Si | 0.15/0.35 |
| P | 0.04 Max |
| S | 0.04 Max |
| Cu | 0.15 Max |
| Wire Size | 9.20 mm | 9.18 to 9.22 |
|---|---|---|
| 9.50 mm | 9.48 to 9.52 | |
| 10 mm | 9.98 to 10.02 | |
| 11 mm | 10.98 to 11.02 | |
| U.T.S. | Kg/mm2 | 122-145 |
| Reduction in Area | % | 30.0 |