Alloy Steel 52100

Chemical Analysis
C% Carbon
0.95 – 1.10
Mn% Manganese
0.25 – 0.45
P% Phosphorus
0.025 max
S% Sulfur
0.025 max
Si% Silicon
0.20 – 0.35
Cr% Chromium
1.30 – 1.60

General characteristics of Alloy Steel 52100

Alloy 52100 is a high – carbon, chromium – bearing steel with excellent strength and fatigue properties.


Alloy 52100 grade 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.


This alloy 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.

Heat treatment

Annealing: for spheroidization the following iso anneal is recommended:

1500ºF (815ºC) for 3 hours

1350ºF (735ºC) for 4 hours

1250ºF (675ºC) for 3 hours

Slow cool to 1000ºF (540ºC) then air cool.

Normalizing: 1650-1700ºF (900-925ºC) and air cool.

Hardening: 1475-1525ºF (800-830ºC) and water quench, OR

1500-1550ºF (815-840ºC) and oil quench

Tempering: to desired hardness, using available tempering curves, following water or oil quench.

Machinability: in the spheroidized condition is 45 percent of that of B1112 steel.

Weldability: This steel would not normally be welded.


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