Mat.No. 1.7176 DIN 55Cr3 SAE 5155 55CrMnA SUP9 Spring Steel
Mat.No. 1.7176 DIN 55Cr3 SAE 5155 55CrMnA SUP9 Spring Steel
1. 1.7176 Applications:
EN 1.7176 steel is an alloy steel formulated for primary forming into wrought products. 1.7176 is the EN numeric designation for this material. 55Cr3 is the EN chemical designation. It has a moderately low embodied energy among EN wrought alloy steels. Steel grade for laminated springs thickness above 7 mm for trucks and railway vehicles, coiled and threaded springs.
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2.Quality Standard:
JIS G4801 2005 Spring Steels
BS EN 10089 2002 Hot rolled steels for quenched and tempered springs
ASTM A29 Standard Specification Steel Bars, Carbon and Alloy, Hot-Wrought, General Requirements
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3.All Grades Comparison:
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4.Chemical Composition(%)
| Steel Grade | C | Si | Mn | P | S | Cr |
|---|---|---|---|---|---|---|
| 5155 | 0.51-0.59 | 0.15-0.35 | 0.70-0.90 | 0.035 max | 0.040 max | 0.75-1.00 |
| 55Cr3 | 0.52-0.59 | 0.40 max | 0.70-1.00 | 0.025 max | 0.025 max | 0.70-1.00 |
| SUP9 | 0.52-0.60 | 0.15-0.35 | 0.65-0.95 | 0.030 max | 0.030 max | 0.65-0.95 |
| SUP9A | 0.56-0.64 | 0.15-0.35 | 0.70-1.00 | 0.030 max | 0.030 max | 0.70-1.00 |
| 55CrMnA | 0.52-0.60 | 0.17-0.37 | 0.65-0.95 | 0.025 max | 0.025 max | 0.65-0.95 |
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5. 1.7176 HEAT TREATMENT:
- FORGING:Hot forming temperature: 1050 – 850°C.
- SOFT ANNEALING: Heat to 640 – 680°C, cool slowly in furnace. This will produce a maximum Brinell hardness of 248.
- HARDENING: Harden from a temperature of 830 – 860°C followed by oil quenching.
- TEMPERING:Tempering temperature: 430 – 500°C, air.
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6. 1.7176 Mill′s test certificate:
EN 10204/3.1 with all relevant data reg. chem. composition, mech. properties and results of testing.
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