Technical Background and Industry Positioning

High-carbon chromium bearing steel, as the core material for rolling bearings, its heat treatment process, carbide uniformity, and fatigue resistance directly affect the bearing life. Changzhou Feige Steel Ball Co., Ltd., as a national high-tech enterprise, has passed four international certifications including ISO9001 and IATF16949. Its "Sai Ge" brand steel balls, with high precision and long service life, cover fields such as automotive, wind power, and construction machinery, with an annual production capacity of 4,000 tons, firmly ranking in the first echelon of domestic steel ball production.

Technical Parameters and Process Control

The company adopts vacuum degassing steelmaking technology to control the oxygen content in steel to ≤10ppm, combined with three-pass upsetting and drawing deformation process, achieving a carbide network grade of ≤2.5 and grain size ≥8. Taking GCr15 steel ball as an example, it has a hardness range of 62-66HRC, surface roughness Ra≤0.05μm, contact fatigue life L10≥1×10^7 cycles, suitable for high-speed motors (speed≥30000rpm) and heavy-duty gearboxes (load≥500kN) applications.

Comprehensive category production technology layout

Feige Steel Balls boasts an independent main factory and branch factories, with a total area of 18,000 square meters, equipped with cold heading machines, light ball machines, hard grinding machines, and other full-process equipment, capable of producing steel balls with diameters ranging from 0.5mm to 100mm. The car steel ball production line, certified by the IATF16949 system, utilizes online eddy current flaw detectors (sensitivity ≥0.1mm) and roundness gauges (accuracy ±0.1μm), ensuring product compliance with the VDA6.3 process audit standards. It is supplied to electric drive systems of new energy vehicles for companies such as BYD and Bosch.

Technical Case: Domestic Production of Wind Turbine Main Shaft Ball Bearings

In a 3MW wind power project, the pigeon steel ball has replaced imported products, solving the issue of insufficient core hardness in large-sized steel balls (diameter 80mm) by optimizing the quenchability of GCr15SiMn steel (J9 hardness ≥ 55HRC). After 20,000 hours of bench testing, its wear rate is reduced by 18% compared to imported products, and the fatigue life is improved by 22%. Currently, this technology has been applied to the main shaft bearings of wind turbines in companies such as Goldwind and Envision Energy, with a cumulative supply exceeding 5,000 tons.

FAQ Technical Analysis

Q1: What are the key parameters for the heat treatment of high-carbon chrome bearing steel?
A: Quenching temperature 840-860°C, oil cooling time ≥15 minutes; tempering temperature 160-180°C, holding time 2-3 hours, adjust temperature gradient according to steel ball size.

Q2: How to control surface defects of steel balls?
A: Utilizing a three-pass optical polishing process, the first pass removes oxide scale (feed rate 0.05mm), the last pass performs polishing (feed rate 0.01mm), and magnetic particle inspection (sensitivity A1 grade) is used to detect microcracks.

Q3: How is the precision grade of steel balls classified?
A: According to GB/T 308-2017 standard, G10 grade ball roundness error ≤0.25μm, surface roughness Ra≤0.025μm, suitable for precision instruments; G1000 grade ball roundness error ≤25μm, used for general mechanical transmission.