SUJ2 Bearing Steel | AISI 52100 | 100Cr6 Steel

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SUJ2 Bearing Steel | AISI 52100 | 100Cr6 Steel  Alloy Steel

SUJ2 Suppliers - AISI 52100 Bearing Steel, EN31, 100Cr6, 1.3505 

The common name for this type of Bearing Steel is SUJ2 , the JIS Standard Alloy Bearing Steel, Origin Japan Bearing Steel. 

Bearing steel 52100 is one kind of special steel with features of high wear resistance and rolling fatigue strength. 
AISI 52100 / SUJ2 Alloy Steel is known as a high carbon , chromium containing low alloy steel.  

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Advantages of Chrome Bearing Steel 52100: 

  • Superior hardness, 60-67 on Rockwell hardness scale (Rc) at room temperature
  • High carbon chrome alloy steel
  • Operates continually at temperatures up to 120°C
  • Used to produce precision ball bearings and roller bearings
  • Cost-effective
  • Long working life


ASTM 52100 Bearing Steel is equivalent to 

Country USA German Japan British
Standard ASTM A295 DIN 17230 JIS G4805 BS 970
Grades 52100 100Cr6/1.3505 SUJ2 535A99/EN31


Chemical Composition of JIS SUJ2 

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


Mechanical Properties of 1.3505 Alloy Steel 

Properties Metric Imperial
Bulk modulus (typical for steel) 140 GPa 20300 ksi
Shear modulus (typical for steel) 80 GPa 11600 ksi
Elastic modulus 190-210 GPa 27557-30458 ksi
Poisson’s ratio 0.27-0.30 0.27-0.30
Hardness, Brinell
Hardness, Knoop (converted from Rockwell C hardness) 875 875
Hardness, Rockwell C (quenched in oil from 150°C tempered) 62 62

Forging of AISI 52100 Steel 

EN31 alloy steel is forged at 927 to 1205°C, and should not be forged below 925ºC. A post-forge equalization treatment is recommended at 745ºC for 4-6 hours followed by air cooling for SAE/AISI 52100 steel.

Heat Treatment of AISI 52100 , SUJ2 Steel 

SUJ 2 alloy steel is heated at 816°C (1500°F) followed by quenching in oil. Before performing this process, it is subjected to normalizing heat treatment at 872°C (1600°F) followed by slowly cooling in order to reduce the machining stress.

Hardening of SUJ2 Steel 

100Cr6 alloy steel is hardened by cold working, or heating and quenching. It can be carburized at 913°C (1675°F) followed by quenching. It is again heated at 788°C (1450°F) followed by quenching for the second time.

Applications for SUJ2 , 52100 Steel 

Alloy Steel 52100 Grade Bearing Steel is mainly used for the manufacture of aircraft bearings and other highly stressed parts. This steel grade SUJ2 Steel is preferably vacuum arc re-melted to give optimum performance.

Typical applications: Bearing Manufacture, CV joints, ball screws, gauges, knife etc.

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E Steel is a Global Metal Procurement Company in providing and sourcing raw materials to the wide range of engineering industries / sectors.  We works as the the Online B2B Metal Marketplace to help our customers in finding the special steels that might feel hard to source locally.  


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