52100 Steel

52100 Steel Grade

AISI 52100 steel is known as a high carbon, chromium containing low alloy steel. The following datasheet gives an overview of AISI 52100 steel.

Chemical Composition
The following table shows the chemical composition of AISI 52100 steel.

  • Element
  • Iron, Fe
  • Chromium, Cr
  • Carbon, C
  • Manganese, Mn
  • Silicon, Si
  • Sulfur, S
  • Phosphorous, P
  • Content (%)
  • 96.5 – 97.32
  • 1.30 – 1.60
  • 0.980 – 1.10
  • 0.250 – 0.450
  • 0.150 – 0.300
  • ≤ 0.0250
  • ≤ 0.0250

 

Physical Properties
The physical properties of AISI 52100 steel are listed in the following table.

  • Properties
  • Density
  • Melting point
  • Metric
  • 7.81 g/cm3
  • 1424oC
  • Imperial
  • 0.282 lb/in³
  • 2595oF

 

Mechanical properties
The mechanical properties of AISI 52100 steel are outlined in the following table.

  • Properties
  • Bulk modulus (typical for steel)
  • Shear modulus (typical for steel)
  • Elastic modulus
  • Poisson’s ratio
  • Hardness, Brinell
  • Hardness, Knoop (converted from Rockwell C hardness)
  • Hardness, Rockwell C (quenched in oil from 150oC tempered)
  • Hardness, Rockwell C (quenched in water from 150oC tempered)
  • Hardness, Rockwell C (quenched in oil)
  • Hardness, Rockwell C (quenched in water)
  • Hardness, Vickers (converted from Rockwell C hardness)
  • Machinability (spheroidized annealed and cold drawn. Based on 100 machinability for AISI 1212 steel)

 

  • Metric
  • 140 GPa
  • 80 GPa
  • 190-210 GPa
  • 0.27-0.30
  • 875
  • 62
  • 64
  • 64
  • 66
  • 848
  • 40
  • Imperial
  • 20300 ksi
  • 11600 ksi
  • 27557-30458 ksi
  • 0.27-0.30
  • 875
  • 62
  • 64
  • 64
  • 66
  • 848
  • 40

 

Thermal Properties
The thermal properties of AISI 52100 steel are given in the following table.

  • Properties
  • Thermal expansion co-efficient (@ 23-280oC/73.4- 36oF, annealed)
  • Thermal conductivity (typical steel)
  • Metric
  • 11.9 µm/moC
  • 46.6 W/mK
  • Imperial
  • 6.61 µin/inoF
  • 323 BTU in/hr.ft².oF

 

Fabrication and Heat Treatment

Machinability
AISI 52100 alloy steel can be machined using conventional techniques. The machinability of this steel can be improved by performing spherodizing annealing process at 649oC (1200oF) before machining.

Forming
AISI 52100 alloy steel can be formed using all conventional techniques such as cold forging or stamping and hot or cold upset forming techniques.

Heat Treatment
AISI 52100 steel is heated at 816oC (1500oF) followed by quenching in oil. Before performing this process, it is subjected to normalizing heat treatment at 872oC (1600oF) followed by slowly cooling in order to reduce the machining stress.

Forging
AISI 52100 alloy steel is forged at 927 to 1205oC (1700 to 2200oF).

Hot Working
AISI 52100 alloy steel can be hot worked at 205 to 538oC (400 to 1000oF).

Cold Working
AISI 52100 alloy steel can be cold worked using conventional techniques in the annealed or normalized conditions.

Annealing
AISI 52100 alloy steel is annealed at 872oC (1600oF) followed by slowly cooling to reduce cold working or machining stress.

Hardening
AISI 52100 alloy steel is hardened by cold working, or heating and quenching. It can be carburized at 913oC (1675oF) followed by quenching. It is again heated at 788oC (1450oF) followed by quenching for the second time.

Applications
AISI 52100 alloy steel is used in bearings in rotating machinery.

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