52100

Alloy Steel

52100

(SAE J404). Nominal values—confirm mill certificate.

Chemical Composition (%)

C0.93
SI0.15
MN0.25
CR1.35
P0.025
S0.015

Mechanical Properties

Hardness(annealed):179-207 HB;Hardness(hardened):59-63 HRC

Equivalent Grades

SAE J404 52100

Available Forms

Bar,Plate

Uses

High-carbon chromium bearing steel for rolling-element bearings, races and precision balls/rollers. Combines high hardness, fatigue life and dimensional stability; also used for gauges, needles and wear parts.

Heat Treatment

Spheroidize anneal (760–780 °C), austenitize 830–860 °C oil quench, temper 150–180 °C to 60–66 HRC; stabilising treatments improve dimensional stability.

Precautions

Preheat and control interpass temperature when welding; post-weld heat treatment or stress relief is recommended to avoid hard-zone cracking. Use low-hydrogen electrodes. Protect from decarburization during heating (controlled atmosphere or protective coating).

Request a Quote Back to category

Comments 0