18CrNiMo7-6/17CrNiMo6/1.6587 Alloy Steel
18CrNiMo7-6 is a case hardening steel with high toughness. There are a number of variants with high cleanliness requirements. All variants possess tighter composition ranges compared to the standard. One variant is produced with the quality class IQ (isotropic quality). This ensures a very low number of elongated sulphide inclusions which will give more isotropic properties. The high oxidic cleanliness will enable the steel to meet the same high cleanliness demands as for re-melted qualities.
Chemical Composition(%)
| Standard | Grade | C | Mn | P | S | Si | Ni | Cr | Mo |
| EN 10084 | 18CrNiMo7-6 | 0.15-0.21 | 0.50-0.90 | ≤ 0.025 | ≤ 0.035 | ≤ 0.04 | 1.4-1.7 | 1.5-1.8 | 0.25-0.35 |
| 1.6587 |
Application
18CrNiMo7-6 round Bar mainly used in mechanical parts, automobile parts, cement plants, power plants, mobile cranes and earth-moving equipment, paper mill, sugar mill, marine, wind gear, oil platform, fire protection, medical fields, industry equipment, collets, cams, rollers, bushes, spindles, and gears, etc.
Mechanical Property
| Process | Tensile Strength Rm (Mpa) | Yield Strength Rp0.2 (Mpa) | Elongation A5 (%) | Area Reduction Ratio C (%) | Hardness (HB) |
| Q+T | 980-1270 | 685 min | 8 min | 35 min | 295-373 |
Heat Treatment Conditions
Annealing: Heat 18CrNiMo7-6 to 650-700°C. Cool in a furnace
Normalizing: 850-880°C. Cool in still air.
Hardening: Carburising: 880-980°C. Core Hardening: 830-870°C, water. Case Hardening: 780-820°C, water.
Tempering: 150-200°C.
| Forging | 925℃-1230℃ |
| Normalizing | 900℃-925℃ |
| Full annealing | 820℃-850℃ |
| Tempering | 150oC – 200oC |
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