20NiCrMo2-2 alloy steel is a low-carbon nickel chromium molybdenum alloy steel. It is a low cost steel with good carburizing performance.
The nickel content of 20NiCrMo2-2 steel is only half, and a small amount of molybdenum element is added. DIN1.6523 steel also increases the manganese content, so it has better hardenability and strength than 18NiCr5-4.
20NiCrMo2-2 is suitable for parts that require good toughness and wear resistance
20NiCrMo2-2 round steel has high hardenability, no temper brittleness, good weldability, and little tendency to form cold cracks. It has good machinability and cold strain plasticity. Generally used in the quenched and tempered or carburized quenching state Due to the appropriate increase in Mn content, the hardenability of this steel is still very good and its strength is higher than that of 20CrNi steel. Commonly used for manufacturing gears in engines and transmission systems of small and medium-sized cars and tractors; Manufacturing carburized and cyanided parts with high core performance requirements, such as the teeth and bodies of cone drills used in petroleum drilling and metallurgical open-pit mines. 20NiCrMo2-2 not only has good comprehensive properties but also can withstand certain temperatures due to its molybdenum content. Forgings for connecting rod and valve sections of internal combustion engines with gear rotors used for manufacturing steam turbines.
The chemical composition of 20NiCrMo2-2 is as follows:
Carbon C: 0.17-0.23
Silicon Si: Less than or equal to 0.040
Manganese Mn: 0.65-0.85
Sulfur S: Less than or equal to 0.025
Phosphorus P: Less than or equal to 0.035
Chromium Cr: 0.35-0.70
Nickel Ni: {{0}}.40~0.70
Molybdenum Mo: {{0}}.15~0.25
20NiCrMo2-2 Mechanical Property Range Values:
yield strength σ s(MPa): Greater than or equal to 590
tensile strength σ b(MPa): Greater than or equal to 1100
elongation δ 5( percent ): Greater than or equal to 9
Reduction of area ψ ( percent ): Greater than or equal to 40
Impact energy Akv (J): Greater than or equal to 47
Delivery status hardness: Less than or equal to 197
20NiCrMo2-2 heat treatment process:
Quenching heating temperature ( degree ): 850; Coolant: oil
Tempering heating temperature ( degree ): 200; Coolant:
EN 10084-2008
EN 10263-3: 2001
EN 10297-1: 2003
