52100 bearing steel, SUJ2, EN31, 100Cr6 , 1.3505
Bearing steel 52100 is one kind of special steel with features of high wear resistance and rolling fatigue strength. High-carbon chromium bearing steel, engineering steel and some types of stainless steel and heat resistant steel are used as materials of bearings and for other purposes.
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
- Long working life
Relevant Steel Specification of ASTM 52100 Bearing Steel
|Standard||ASTM A295||DIN 17230||JIS G4805||BS 970|
SUJ 2 Chemical Composition
|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|
1.3505 Mechanical properties
|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|
|Hardness, Knoop (converted from Rockwell C hardness)||875||875|
|Hardness, Rockwell C (quenched in oil from 150°C tempered)||62||62|
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.
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.
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.
Alloy steel 52100 grade bearing steel is mainly used for the manufacture of aircraft bearings and other highly stressed parts. This steel grade 52100 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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