SUJ2

Other

SUJ2

Japanese-standard bearing steel. (JIS G4805; equiv JIS SUJ2 / AISI 52100 / GB GCr15). Nominal values—confirm mill certificate.

Chemical Composition (%)

C0.95
SI0.15
MN0.5
CR1.3

Mechanical Properties

Hardness:≥62 HRC

Chinese Standard

JIS G4805 SUJ2

Equivalent Standards

AISI 52100 / GB GCr15

Equivalent Grades

JIS SUJ2

Applications

日本轴承钢。,"Bar

Available Forms

Wire"

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).

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