Xi'an machinery & engineering import & export co.,ltd.
China Chrome Steel Bearing Balls & High Precision Bearing Balls Supplier The best precision makes your bearing roll more smoothly. High quality, Best service, Reasonable price.
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28.565mm(1.125394"),G28, High carbon steel balls for High Precision Ball Bearings
Description
Chromium (CR) has a tendency to increase hardness, toughness and wear resistance of steel. Chrome steel is a chrome alloy carbon steel, not a chrome plated steel.
It has good superior performance, and has excellent wear resistance, deformation resistance, high load capacity and high contact fatigue performance after quenching and tempering.
Modern furnaces with precisely controlled atmospheres and temperatures are used for heat treating to assure uniform hardness and proper microstructure for each steel ball.
The high-carbon chromium bearing steel is a high-carbon alloy steel with 1.30~1.65% chromium. It is characterized by a more uniform and stable structure after heat treatment, high hardness, high uniformity, good wear resistance, high contact fatigue strength, and good dimensional stability and corrosion resistance after annealing, its cutting performance is good and the price is relatively cheap. This steel can meet bearing requirements under normal working conditions.
Chrome steel and other metal balls are manufactured using the following processes
Grade and Precision
| Grade | Hardness | Material | Ball Diameter |
| G28 | HRc 62-67 | GCr15, SUJ2, E52100 | 28.585mm (1.125394") of non standard |
Chemical Composition
| Material | (Cr) | (C) | (Mn) | (Si) | (P) | (S) | (Mo) | (Ni) | (Cu) |
| GCr15 | 1.40% to 1.65% | 0.95% to 1.05% | 0.25% to 0.45% | 0.15% to 0.35% | ≤0.025% | ≤0.020% | ≤0.10% | ≤0.25% | ≤0.25% |
| GCr15SiMn | 1.40% to 1.65% | 0.95% to 1.05% | 0.95% to 1.25% | 0.45% to 0.75% | ≤0.025% | ≤0.020% | ≤0.10% | ≤0.25% | ≤0.25% |