Forged Flat Bar 18CrNiMo7-6 High Performance Alloy Steel Gear 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.

Forged Flat bar 18CrNiMo7-6 Product features

Forged Flat bar 18CrNiMo7-6 Chemical Compostion

Forged Flat bar 18CrNiMo7-6 Mechanical properties

• 18CrNiMo7-6 has many grade, with different heat treatment process, different grade will have different performance on mechanical properties.
• Grade 159A - Variant with low sulphur content and high cleanliness demands
• Grade 159B - Variant with controlled sulphur content for consistent machinability and +H hardenability
• Grade 159Q - Isotropic properties (IQ) and better fatigue strength due to higher cleanliness levels, and a finer size and distribution of non-metallic inclusions
• Grade 159X - Variant with controlled sulphur content for consistent machinability and +H hardenability
• Grade 159S - Variant with increased sulphur content.
• Grade 4761(MoCN216) - Low sulphur variant of Imatra

Forged Flat bar 18CrNiMo7-6 Equivalent grades

Forged Flat bar 18CrNiMo7-6 Heat Treatment

• Normalizing:850 – 880°C/air
• Soft annealing:650 – 700°C/furnace
• Stress relieve:630- 650^oC
• 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

18CrNiMo7-6