Used for leaf and volute springs, and road and railway vehicle springs including helical and flat springs. Takes a good hardness and has increased stability in tempering.
Leaf and volute springs, road and railway vehicle springs, helical and flat springs.
| C % | Si % | Mn % |
|---|---|---|
| 0.50-0.60 | 1.50-2.00 | 0.70-1.00 |
| Forging °C | Annealing / normalising °C | Hardening °C | Quench | Tempering °C | Hardness |
|---|---|---|---|---|---|
| 900-830 | 650-680 | 830-860 | Oil | 470-540 | BHN 235 |
| BS 970 (1970-72) | BS 970-1955 | AISI/SAE | DIN | IS |
|---|---|---|---|---|
| 250A53 | En 45 | 9255 | 55Si7 | T55Si7 |
High duty volute and leaf springs, heavy engine valve springs, helical and torsion bar springs. High yield-to-tensile ratio and high torsional fatigue strength.
| C % | Mn % | Cr % | P % | S % |
|---|---|---|---|---|
| 0.45-0.55 | 0.50-0.80 | 0.80-1.20 | 0.05 max | 0.05 max |
| Forging °C | Annealing / normalising °C | Hardening °C | Quench | Tempering °C | Hardness |
|---|---|---|---|---|---|
| 900-830 | 650-680 | 830-860 | Oil | 470-540 | BHN 235 |
| BS 970 (1970-72) | BS 970-1955 | AISI/SAE | DIN |
|---|---|---|---|
| 735A50 | En 47 | 6150 | 50CrV4 |
Values are typical. Request the mill test certificate with your order.
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