DIN 1.6566 17NiCrMo6-4 18NiCrMo5 817M17 SAE4317 Case Hardening Steel
DIN1.6566 17NiCrMo6-4 18NiCrMo5 817M17 SAE4317 Case Hardening Steel
1.Description and Application
17NiCrMo6-4 (uni en 10084) is the new designation of 18NiCrMo5 (UNI 7846). It is the most common case hardening steel and has a medium-high hardenability and a good machinability. After case hardening and hardening treatments, the surface reaches an elevated hardness. 17NiCrMo6-4 is used for the production of mechanical parts, which are submitted to wear (gears, camshafts, bushings, pinions).
2.All Grades Comparison
| DIN | EN | UNI | AFNOR | B.S. | AISI/SAE |
|---|---|---|---|---|---|
| 1.6566 | 17NiCrMo6-4 | 18NiCrMo5 | 18NCD6 | 817M17 | 4317 |
3.Quality Standard
EN 10084 Case hardening steels
4.Chemical Composition(%)
| C | Mn | Si | P | S | Cr | Ni | Mo |
|---|---|---|---|---|---|---|---|
| 0.14-0.20 | 0.60-0.90 | 0.40 max | 0.025 max | 0.035 max | 0.80-1.10 | 1.20-1.50 | 0.15-0.25 |
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 | Hardness (HB) |
|---|---|---|---|---|---|---|
| SOFT ANNEALED | / | / | / | / | / | 255 max |
| QUENCHED AND TEMPERED | 16 max | 1200 min | 980 min | 8 min | 30J min | 359 min |
| QUENCHED AND TEMPERED | 16-40 | 1000 min | 735 min | 9 min | 32J min | 298 min |
| QUENCHED AND TEMPERED | 40-100 | 900 min | 635 min | 10 min | 35 min | 271 min |
6.HEAT TREATMENT:
- Soft Annealing: Heat to 700oC min, cool slowly. This will produce a maximum Brinell hardness of 229.
- Normalizing: Temperature: 880oC min.
- Hardening: Harden from a temperature of 780-820oC, followed by oil or quenching.
- Tempering: Heated into 150-180oC, then slow cooling in air.
7.Forging:
Hot forming temperature: 900-1100oC.
8.Mill′s test certificate:
EN 10204/3.1 with all relevant data reg. chem. composition, mech. properties and results of testing.
