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Special Steels

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High-carbon chromium bearing steel

Steel Grade Chemical Composition (%) Properties Heat treatment Hardness Main application
NACHI AISI
SAE		 JIS C Si Mn Cr

Anne
aling
(°C)

Austeni
tizing
(°C)

Temp
ering
(°C)

 Annealed hardness
(HB)		 Practical hardness
(HRC)
SUJ2 E52100 SUJ2 1.00 0.3   1.5 High wear resistance and dimensional stability 750-190 SC 810-
850
OQ		 150-
190
AC		 Max201 62-65 Bearing / Gages / Rolls
SUJ3 ASTM
A485
Grade
1		 SUJ3 1.00 0.6 1.0 1.0 Good hardenability 790-
830
OQ		 Max207 Large bearings
SC:Slow cooling OQ:Oil cooling AC:Air cooling
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