AISI L3 SUJ2 100Cr6 DIN1.3505 52100 Bearing Steel

AISI L3 100Cr6 DIN1.3505 52100 Bearing Steel 52100 bearing steel AISI L3 SUJ2 100Cr6 DIN1.3505 52100 Bearing Steel AISI L3 100Cr6 DIN1

AISI L3 100Cr6 DIN1.3505 52100 Bearing Steel


52100 bearing steel is a high carbon, chromium containing low alloy steel that is through hardening and noted in particular for use as bearings.


52100 bearing steel is primarily used for the manufacture of aircraft bearings and other highly stressed parts. It has the good rolling fatigue strength required at operating temperatures less than 400ºF (200ºC). The grade is preferably vacuum arc re-melted to give optimum performance.

Quality Standard:

JIS G4805 1999 high carbon chromium bearing steels
DIN 17230-1980 Ball and Roller Bearing Steels
ASTM A29 Standard Specification Steel Bars, Carbon and Alloy, Hot-Wrought, General Requirements

All Grades Comparison:

ASTM Material No. EN JIS
52100/L3 1.3505 100Cr6 SUJ2

Chemical Composition(%)

Steel Grade C Si Mn P S Cr Ni Cu V O2
52100 0.93-1.05 0.15-0.35 0.25-0.45 0.025 max 0.015 max 1.35-1.60 0.30 max 0.30 max / 0.0015 max
100Cr6 0.90-1.05 0.15-0.35 0.25-0.45 0.030 max 0.025 max 1.35-1.65 0.30 max 0.30 max / /
L3 0.95-1.10 0.10-0.50 0.25-0.80 0.030 max 0.030 max 1.30-1.70 / / 0.10-0.30 /


  • FORGING:52100 bearing steel is forged at 1950 – 2100ºF (1065 – 1150ºC), and should not be forged below 1700ºF (925ºC.) A post-forge equalization treatment is recommended at 1375ºF (745ºC) for 4-6 hours followed by air cooling.
  • ANNEALING: 52100 bearing steel is annealed at 872°C (1600°F) followed by slowly cooling to reduce cold working or machining stress.
  • HARDENING: 52100 bearing 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.

Mill′s test certificate:

EN 10204/3.1 with all relevant data reg. chem. composition, mech. properties and results of testing.

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