It is a high carbon alloy spring steel. It is annealed before supplying. The biggest advantage of this grade is hot working performance, decarburization resistance.
Hot Rolled
It is used in heavy vehicles, tractors, large plate springs and helical springs.
| Internal Standard | BS | DIN | IS | EN | AISI/SAE |
| SUP-9 | 527A60 | 55Cr3 | - | - | 5155 / G51550 |
| C | MN | SI | S | P | Cr | Ni | Mo | V | B |
| 0.52-0.58 | 0.65-0.95 | 0.15-0.35 | .030 Max | .030 Max | 0.65-0.95 | - | - | - | - |
200-240 BHN
Spread over 2 verticals, the group produces economical and class-leading mild, alloy and carbon steel, hex, round, square, wire rods, ingots and billets with the most modern integrated steel manufacturing facility.
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