GCr9

Other

GCr9

Chinese GB steel grade GCr9

Chemical Composition (%)

C0.95
CR1.3
SI0.15
MN0.25
P0.025
S0.025

Applications

Chinese national standard (GB) steel grade per GB/T specification.

Available Forms

Bar, plate, sheet, tube, forgings, strip, 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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