Mandi Gobindgarh, Punjab
+91 93570 70006
AK Steels offers different grades of spring steel with defined chemical compositions and dimensional specifications. The grade range includes EN45A, 65SiCr7, 65Si7, 60Si7, 60SiCr7, SUP 6, SUP 9, SUP11A, 50CrV4, EN 47 A and 51CrV4.
The published specifications cover chemical composition, flat dimensions, mechanical properties, width and thickness tolerances, edge radius, length and supply condition.
Chemical composition of the spring steel grades offered by AK Steels, as published on the company's grade specification page.
| Grade | C % | Mn % | Si % | S % Max | P % Max | Cr % | Other % |
|---|---|---|---|---|---|---|---|
| EN45A | 0.58–0.65 | 0.80–1.00 | 1.70–2.00 | 0.035 | 0.050 | 0.20 max | – |
| 65SiCr7 | 0.60–0.80 | 0.70–1.00 | 1.50–1.80 | 0.045 | 0.045 | 0.20–0.40 | – |
| 65Si7 | 0.60–0.68 | 0.70–1.00 | 1.50–1.80 | 0.040 | 0.040 | – | – |
| 60Si7 | 0.55–0.65 | 0.80–1.00 | 1.50–2.00 | 0.045 | 0.045 | – | – |
| 60SiCr7 | 0.55–0.65 | 0.70–1.00 | 1.50–1.80 | 0.045 | 0.045 | 0.20–0.40 | – |
| SUP 6 | 0.56–0.64 | 0.70–1.00 | 1.50–1.80 | 0.025 | 0.025 | – | – |
| SUP 9 | 0.50–0.60 | 0.65–0.95 | 0.15–0.35 | 0.035 | 0.035 | 0.65–0.95 | Al: 0.04 max |
| SUP11A | 0.56–0.64 | 0.70–1.00 | 0.15–0.35 | 0.035 | 0.035 | 0.70–1.00 | B: 0.0005 min, Al: 0.04 max |
| 50CrV4 | 0.47–0.55 | 0.70–1.10 | 0.15–0.40 | 0.030 | 0.030 | 0.90–1.20 | V: 0.10–0.20, Al: 0.04 max |
| EN 47 A | 0.45–0.55 | 0.50–0.80 | 0.50 max | 0.050 | 0.050 | 0.80–1.20 | V: 0.15 min, Al: 0.04 max |
| 51CrV4 | 0.47–0.55 | 0.70–1.10 | 0.15–0.40 | 0.025 | 0.025 | 0.90–1.20 | V: 0.10–0.25, Al: 0.04 max |
The published size chart lists widths and corresponding thicknesses regularly rolled by AK Steels.
| Width (mm) | Available Thicknesses (mm) |
|---|---|
| 50 | 5, 6, 6.5, 7, 8, 9, 10, 11, 12 |
| 50.8 | 6.14, 7.95, 9.12, 9.93, 10.31, 12.7 |
| 57 | 7.5, 8, 9 |
| 57.15 | 8.33, 9.12, 10.19 |
| 60 | 6, 7, 8, 9, 10, 10.3, 10.5, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 23 |
| 63.5 | 4.76, 6.35, 6.65, 7, 7.94, 9, 11, 12, 12.7 |
| 70 | 5, 6, 7, 7.5, 8, 9, 10, 11, 12, 12.7, 13, 14, 17, 18, 20, 22, 23, 25, 26, 28 |
| 75 | 8, 9, 11, 12, 13, 20, 26, 28 |
| 76.2 | 8.7, 10.31, 11.1, 11.11, 12.67, 12.7, 13, 14, 14.28, 14.30, 15, 17, 19, 21, 22.53, 26.95 |
| 77 | 11, 12, 13, 14, 15 |
| 80 | 7, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 22, 23, 24, 25, 26, 32 |
| 88.9 | 25.4 |
| 90 | 6, 9, 9.8, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 28 |
| 100 | 9, 10, 11, 12, 12.7, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28 |
| 101.6 | 11.1, 12.7, 13.39, 19.5 |
| 104 | 18 |
| 106 | 21 |
| 119 | 14, 18 |
| 120 | 14, 16, 18, 24, 25 |
Above-mentioned sizes are sizes rolled regularly. Other sizes can also be rolled as per customer demand.
Thickness tolerances are specified according to the published IS standard data for different flat thickness ranges.
| Thickness | Full | Partial | Total |
|---|---|---|---|
| < 13 | 0.05 | 0.150 | 0.200 |
| 13 – 15 | 0.05 | 0.250 | 0.300 |
| 15 – 18 | 0.05 | 0.250 | 0.300 |
| 18 – 25 | 0.05 | 0.350 | 0.400 |
| 25 – 30 | 0.05 | 0.350 | 0.400 |
The width tolerance values published by AK Steels vary according to the specified flat width.
| Width Range | Tolerance |
|---|---|
| Over 38 up to 50 | ± 0.30 |
| Over 50 up to 75 | ± 0.50 |
| Over 75 up to 100 | ± 0.70 |
| Over 100 up to 125 | ± 0.90 |
Published thickness tolerance values for the specified thickness ranges.
| Thickness | ≤ 10 MM | > 10 MM |
|---|---|---|
| Standard Tolerance | ± 0.15 | ± 0.15 |
| Higher Range | ± 0.20 | ± 0.25 |
| Higher Range | ± 0.25 | ± 0.40 |
Thickness / 2 (T/2) mm ± 2 mm
DIN STD: EN 10092-1
As specified in purchase order, with 0–50 mm margin.