30CrMoV9 DIN 1.7707 Nitriding Steel
30CrMoV9 DIN1.7707 Nitriding Steel
1. 1.7707 Application
EN 1.7707 steel is an alloy steel formulated for primary forming into wrought products. Cited properties are appropriate for the quenched and tempered condition. 1.7707 is the EN numeric designation for this material. 30CrMoV9 is the EN chemical designation. Structural parts of medium and large cross sections and high surface hardness, e.g., valve and gate valves, cylinders for combustion engines, superheated steam valves and fittings.
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2.All Grades Comparison
| DIN | EN |
|---|---|
| 1.7707 | 30CrMoV9 |
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3.Quality Standard
EN 10250 Open steel die forgings for general engineering purposes. Alloy special steels
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4. 1.7707 Chemical Composition(%)
| C | Mn | Si | P | S | Cr | Ni | Mo | V |
|---|---|---|---|---|---|---|---|---|
| 0.26-0.34 | 0.40-0.70 | 0.40 max | 0.035 max | 0.035 max | 2.30-2.70 | 0.60 max | 0.15-0.25 | 0.10-0.20 |
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5.Mechanical Properties(T=20°C if not differently stated)
| Process | Diameter(mm) | Tensile Strength Rm (Mpa) | Yield Strength Rp0.2 (Mpa) | Elongation A5 (%) | Impact Value Kv (J) Room Temperature |
|---|---|---|---|---|---|
| QUENCHED AND TEMPERED | 160 max | 900 min | 700 min | 12 min | 35 min |
| QUENCHED AND TEMPERED | 160-330 | 800 min | 590 min | 14 min | 35 min |
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6. 1.7707 HEAT TREATMENT:
- Soft Annealing: Heat to 680-720oC, cool slowly. This will produce a maximum Brinell hardness of 248.
- Nitriding:
Gas/plasma nitriding temperature (gas, salt bath): 570-580oC
Gas/plasma nitriding temperature (powder, plasma): 580oC
Surface hardness after nitriding: 800 HV - Hardening: Harden from a temperature of 850-880oC followed by oil quenching.
- Tempering:Tempering temperature: 570-680oC.
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7.Forging:
Hot forming temperature: 1050-850oC.
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8.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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