30CRNIMO8, 1.6580, 30NCD8 Round bar

30CrNiMo8, 1.6580 

Chemical composition % of steel 30CrNiMo8 (1.6580): EN 10083-3-2006

Equivalent grades of steel 30CrNiMo8 (1.6580)

Specification and Application 

Alloyed structural steel with medium hardenability designed for heavy duty components, characterized by high elasticity and strength properties reaching over 1560 N/mm2 at small diameters. When softened, the hardness reaches max. 248 HRB. It is also characterized by its resistance to variable loads and impacts. 

The material is not suitable for welding and ultimately requires additional preheating. Grade 30CrNiMo8 is used for production of heavily loaded parts, shafts and drive axes, steering shafts, crankshafts of engines, screws and elements exposed to temperatures in the power industry. 

Mechanical properties of 30CrNiMo8, 1.6580 

Dimensions <16mm 

• Tensile strength, Rm 1250 - 1450 N/mm2 

• Yield strength, Re: >1050 N/mm2 

• Elongation, A: >9% Necking, 

• Z: >40% 

Dimensions 16-40mm 

• Tensile strength, Rm 1250 - 1450 N/mm2 

• Yield strength, Re: >1050 N/mm2 

• Elongation, A: >9% Necking, 

• Z: >40% 

• Tensile strength, Rm 1100 - 1300 N/mm2 

• Yield strength, Re: >900 N/mm2 

• Elongation, A: >10% Necking, 

• Z: >45% 

• Impact strength, KV: >35 J 

Dimensions 100-160mm 

• Tensile strength, Rm 1000 - 1200 N/mm2 

• Yield strength, Re: >800 N/mm2 

• Elongation, A: >11% Necking, 

• Z: >50% 

• Impact strength, KV: >45J 

Dimensions 160-330mm: 

• Tensile strength, Rm >850 N/mm2 

• Yield strength, Re: >630 N/mm2 

• Elongation, A: >12% 

• Impact strength, KV: >45 J 

Dimensions >330mm 

• Tensile strength, Rm >800 N/mm2 

• Yield strength, Re: >590 N/mm2 

• Elongation, A: >12% 

• Impact strength, KV: >40 J 

Heat treatment of 30CrNiMo8, 1.6580 steel 

Softening annealing at a temperature of 640 - 680℃ Normalizing annealing at a temperature of 840 - 860℃ Hardening with cooling in oil at 815 - 845℃ Tempering with cooling in air at 550 - 650℃