Carburizing Bearing Steel

Carburizing Bearing Steel (also known as Case Hardening Bearing Steel) is engineered for applications where standard high-carbon bearing steel (like 52100) is too brittle. By using a low-carbon alloy (carbon ~0.20%) and subjecting it to a Carburizing (Case Hardening) process, the steel develops a unique dual structure:

1. The Case (Surface): High carbon concentration, achieving high hardness (58-62 HRC) for excellent wear resistance.
2. The Core (Center): Retains its low carbon toughness, allowing the bearing to absorb heavy shocks and impacts without cracking.

Our 8620 (G20CrNiMo) and 4320 grades are the industry benchmarks for manufacturing large-size bearings used in wind turbines, rolling mills, and mining equipment where reliability under impact load is non-negotiable.

We supply high-cleanliness carburizing steels with strictly controlled hardenability bands (H-Band).

Table-1

Select the right grade based on core strength requirements.

Table-2

Nickel and molybdenum are added for deep hardenability and toughness.

Table-3

Large diameter bars and forged rings for heavy industry.

• Impact Resistance: The soft, ductile core prevents catastrophic failure when the bearing is subjected to sudden shock loads (e.g., in a rock crusher or railway wheel).
• Deep Hardenability: Grades like 4320 and 18CrNiMo7-6 ensure that the carburized case is supported by a strong core, even in large cross-sections (like wind turbine gears).
• Wear Resistant Surface: After carburizing, the surface hardness reaches 60 HRC, providing wear life comparable to 52100 steel.
• Compressive Residual Stress: The case hardening process induces compressive stress on the surface, which significantly improves fatigue life.

Hot Tags: carburizing bearing steel, China carburizing bearing steel manufacturers, suppliers