DIN1.6587/18CrNiMo7-6 steel Manufacturer and Exporter,supplied with round,square,flat,block,and shaft etc.DIN1.6587/18CrNiMo7-6 is a low carbon,case hardening (carburizing) steel which contains 1.8% chromium – nickel – molybdenum as strengthening agents as per EN 10084. Characterised by high core strength and toughness in medium to large sections with case hardness up to Rc62 when carburized, hardened and tempered,and it is also used in area of heavy and high strained gear parts with high demands on toughness at core tensile of 1050–1350N/mm2.DIN1.6587/18CrNiMo7-6 is same as 17CrNiMo6 steel,generally supplied in the annealed condition with a maximum brinell hardness of 229 (Rc22).
1.Supply Form & Size & Tolerance
| Supply Form | Size(mm) | Process | Tolerance | |
Round | Φ6-Φ100 | Cold Drawn | Bright/Black | Best H11 |
Φ16-Φ350 | Hot Rolled | Black | -0/+1mm | |
| Peeled/ground | Best H11 | |||
Φ90-Φ1000 | Hot Forged | Black | -0/+5mm | |
| Rough Turned | -0/+3mm | |||
Flat/Square/Block | Thickness :120-800 | Hot Forged | Black | -0/+8mm |
| Width:120-1500 | Rough Machined | -0/+3mm | ||
Remark:Tolerance can be customized as per requests
2.Chemical Composition
| Standard | Grade | C | Si | Mn | P | S | Ni | Cr | Mo |
EN 10084 | 18CrNiMo7-6 | 0.15-0.21 | ≤ 0.4 | 0.5-0.9 | ≤ 0.025 | ≤ 0.035 | 1.4-1.7 | 1.5-1.8 | 0.25-0.35 |
| 1.6587 |
3.Physical Property
| Density, g/cm3 | 7.85 | ||||
| Specific heat capacity J/(kg.K) | 460 | ||||
| Electric resistivity Ohm.mm2 /m | 0.18 | ||||
| Electric conductivity Siemens.m/mm2 | 5.55 | ||||
| Modulus of elasticity Gpa | 210 | ||||
| Thermal expansion 10^6 m/(m.K) | 100 ℃ | 200 ℃ | 300 ℃ | 400 ℃ | 500 ℃ |
| 11.1 | 12.1 | 12.9 | 13.5 | 13.9 | |
4. Mechanical Property
| Size mm | ≤ 11 | 12-30 | 31-63 |
| R Mpa | 1180-1420 | 1080-1320 | 980-1270 |
| Rp 0.2 Mpa | ≥ 835 | ≥785 | ≥ 685 |
| A % | ≥ 7 | ≥ 8 | ≥ 5 |
| C % | ≥ 30 | ≥ 35 | ≥ 35 |
| Kv J | ≥ 44 | ≥ 44 | |
| Hardness HB | 354-406 | 327-384 | 295-373 |
5.Forging
DIN 1.6587 | 17CrNiMo6 |18CrNiMo7-6 forging temperature:900 – 1100°C,cool slowly in the sand after forged.
6.Heat Treatment
- Normalizing:850 – 880°C/air
- Soft annealing:650 – 700°C/furnace
- Stress relieve:630- 650oC
- Carburising:880 – 980°C
- Core hardening:830 – 870°C/water
- Intermediate annealing:630 – 650°C
- Case hardening:780 – 820°C/water
- Tempering:150 – 200°C
7.Surface Hardness
- Treated to improveshearability(+S):Max 255HB
- Soft annealed(+A):Max 229HB
- Treated to hardness range(+TH):179-229HB
- Treated to ferrite-pearlite structure and hardness range(+FP):159-207HB
8.Application
DIN 1.6587 | 17CrNiMo6 |18CrNiMo7-6 steel for the parts which require core tensile strength and high hardness. Susceptible to the large seized parts with high wearing resistance and loading such as: Heavy Duty Bushings and Bearings, Cam Followers, Clutch Dogs, Compressor Bolts, Extractors, Fan Shafts, Heavy Duty Gears, Pump Shafts, Sprockets, Tappets, Wear Pins, Wire Guides etc..
