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

Chemical Composition

Physical Property

Mechanical Property

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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