Case Hardening Steel 20Ni2Cr2Mo2 Round Bars

Indian Standard IS 20Ni2Cr2Mo2 Round Bars

IS 20Ni2Cr2Mo2 is defined as low Ni-Cr-Mo alloy steel. It has good weldability, toughness and machinability, but low in corrosion resistance. 20Ni2Cr2Mo2 is suitable for parts which require high hardness and good wear resistance after nitriding.This material is generally supplied in annealed condition with hardness below 212HB.

IS 20Ni2Cr2Mo2 Hot Rolled Round is also known as 20NiCrMo2-2 / 1.6523 Steel.

Case Hardening of parts rneans which are carburized or carbonitrided on their surface and subsequently hardened to produce a high degree of hardness in the surface zone, whilst the core material is characterized by relatively good toughness.

20Ni2Cr2Mo2 Alloy Steel Round Bars is a common, carburizing alloy steel. This alloy steel is flexible during hardening treatments, thus enabling improvement of case/core properties.

20Ni2Cr2Mo2 / DIN 1.6523 Case Hardening steel manufacturers and suppliers, supplied in round rods, square / flat bars, rollers, shafts, blocks and forging pieces.

Supply Form & Size :

• Round Bars : Dia.80 - 1,000 mm as Forged
• Rolled Round Bars : Dia.16 - 130mm

Chemical Composition of 20Ni2Cr2Mo2 Round Bar - Case Hardening Steel :

Equivalent grades of steel 20Ni2Cr2Mo2 / (1.6523) :

Heat Treatment & Mechanical Property of 20Ni2Cr2Mo2 Round Bars :

• Normalizing : 880 - 920°C, Cooling in air
• Annealing : 650 - 700°C, Cooling in furnace
• Carburizing : 880 - 980°C
• Core Hardening : 860 - 900°C, oil/water
• Case Hardening : 780 - 820°C, oil/water
• Tempering : 150 - 200°C, Cooling in air

Annealing of 20Ni2Cr2Mo2 Round Bar :

20Ni2Cr2Mo2 steel may be given a full anneal by heat to 820℃ – 850℃, and hold until temperature is uniform throughout the section and cool in furnace or air cooled.

Tempering of 20Ni2Cr2Mo2 Round Bar :

Tempering of heat treated and water quenched parts of 20Ni2Cr2Mo2 steels (not carburized) is done at 400 F to 1300 F to improve case toughness with minimal effect on its hardness. This will also reduce the possibility of grinding cracks.

Hardening of 20Ni2Cr2Mo2 Round Bars :

The 20Ni2Cr2Mo2 steel will be austenitized at around 840°C – 870°C, and oil or water quenched depending upon section size and intricacy. Cool in Air or Oil required.

Normalizing :

1675ºF (910ºC) and air cool. This is another method of improving machinability in 20Ni2Cr2Mo2 material; normalizing might also be used prior to case hardening.

Machinability of 20Ni2Cr2Mo2 Steel :

The 20Ni2Cr2Mo2 alloy steel is readily machined after heat treatment and/or carburizing, should be at a minimum so as not to impair the hardened case of the part. Machining may be done by conventional means prior to heat treatment - after carburizing machining is usually limited to grinding.

Welding of 20Ni2Cr2Mo2 Materials :

The 20Ni2Cr2Mo2 may be welded as rolled condition by conventional methods, usually gas or arc welding. Preheating at 400 F is beneficial and subsequent heating after welding is recommended – consult the approved weld procedure for the method used. However, welding in the case hardened or through hardened condition is not recommended.

Application of 20Ni2Cr2Mo2 Round Bars :

20Ni2Cr2Mo2 steel material is used extensively by all industry sectors for light to medium stressed components and shafts requiring high surface wear resistance with reasonable core strength and impact properties.

Typical applications are: Arbors, Bearings, Bushings, Cam Shafts, Differential Pinions, Guide Pins, King Pins, Pistons Pins, Gears, Splined Shafts, Ratchets, Sleeves and other applications where it is helpful to have a steel that can be readily machined and carburized to controlled case depths.