18CrNiMo7-6 hot rolled steel round bars
18CrNiMo7-6 hot rolled steel round bars
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- Commodity name: 18CrNiMo7-6 hot rolled steel round bars
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. 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
18CrNiMo7-6 hot rolled steel round bars information
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. 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
Chemical Composition
Standard Grade C Mn P S Si Ni Cr Mo
EN 1008418CrNiMo7-6
0.15-0.21
0.50-0.90
≤ 0.025
≤ 0.035
≤ 0.04
1.4-1.7
1.5-1.8
0.25-0.351.6587 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 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 Forging
DIN 1.6587 | 17CrNiMo6 |18CrNiMo7-6 forging temperature:900 – 1100°C,cool slowly in the sand after forged.
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
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
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..
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