DIN 1.6587 X4317 18CrNiMo7-6 17CrNiMo6 18NCD6 Case Hardening Steel Bar
DIN1.6587 X4317 18CrNiMo7-6 17CrNiMo6 18NCD6 Case Hardening Steel Bar
1. 1.6587 Application
EN 1.6587 steel is an alloy steel formulated for primary forming into wrought products. 1.6587 is the EN numeric designation for this material. … It has a moderately high density among EN wrought alloy steels. In addition, it has a fairly high base cost and a moderately high electrical conductivity. Severely stressed components for mechanical engineering and automobile industry, gear for mining, cement plants, power plants, mobile cranes and earth-moving equipment, paper mill, sugar mill, marine, wind gear, railway systems, oil platform, etc.
2.All Grades Comparison
| DIN | EN | ANFOR | AS |
|---|---|---|---|
| 1.6587 | 18CrNiMo7-6 | 18NCD6 | X4317 |
3.Quality Standard
EN 10084 Case hardening steels
DIN17210 Case hardening steels
AS1444 Wrought alloy steels
4.Chemical Composition(%)
| C | Mn | Si | P | S | Cr | Ni | Mo |
|---|---|---|---|---|---|---|---|
| 0.15-0.21 | 0.50-0.90 | 0.40 max | 0.025 max | 0.025 max | 1.50-1.80 | 1.40-1.70 | 0.25-0.35 |
5.Mechanical Properties(T=20°C if not differently stated)
| Process | Diameter(mm) | Tensile Strength Rm (Mpa) | Yield Strength Rp0.2 (Mpa) | Elongation A5 (%) | Area Reduction Ratio C (%) | Impact Value Kv (J) Room Temperature | Hardness (HB) |
|---|---|---|---|---|---|---|---|
| SOFT ANNEALED | / | / | / | / | / | / | 229 max |
| NORMALIZED | / | / | / | / | / | / | 140-210 |
| QUENCHED AND TEMPERED | 11 max | 1180-1420 | 835 min | 7 min | 30 min | 44 min | 354-406 |
| QUENCHED AND TEMPERED | 12-30 | 1080-1320 | 785 min | 8 min | 35 min | 44 min | 327-384 |
| QUENCHED AND TEMPERED | 31-63 | 980-1270 | 685 min | 8 min | 35 min | / | 295-373 |
| QUENCHED AND TEMPERED | 100-160 | 1000-1200 | 800 min | 11 min | 50 min | 45 min | 295-353 |
| QUENCHED AND TEMPERED | 160-250 | 1000-1200 | 800 min | 11 min | 50 min | 45 min | 295-353 |
6.HEAT TREATMENT:
- Soft Annealing: Heat 17CrNiMo6 to 650-700oC, cool slowly in furnace. This will produce a maximum Brinell hardness of 229.
- Normalizing: 850-880oC, air.
- Hardening: Carburising: 880-980oC. Core Hardening: 830-870oC, water. Case Hardening: 780-820oC, water.
- Tempering:Temperature: 150-200oC
7.Forging:
Hot forming temperature: 1100-900oC.
8.Welding:
Pre-heat welding area to 250-450°C and maintain this temperature while welding with a low hydrogen electrode. Cool 17CrNiMo6 at a maximum rate of 100°C per hour. Weld before carburising.
9.Mill′s test certificate:
EN 10204/3.1 with all relevant data reg. chem. composition, mech. properties and results of testing.
