Introduction of Japanese Standard Phosphor Bronze Castings
Phosphor bronze is a Cu-Sn-P alloy, a copper alloy containing 0.05-0.5% phosphorus, including two types of phosphor bronze castings (JIS symbol CAC502, formerly JIS symbol PBC2) and three types of phosphor bronze castings (JIS symbol CAC503, formerly JIS symbol PBC3). They are also distinguished by the casting method, CAC502A is a sand mold, and CAC502B is a casting mold.
CAC502 has good corrosion resistance, wear resistance and mechanical properties, especially its hardness is better than other bronzes.
Therefore, it is widely used as a material for wear-resistant mechanical parts such as gears, bearings, sliding parts, and bushings.
CAC503 has about 3% more tin, so it is harder than CAC502.
Characteristics and use examples of phosphor bronze castings
Symbol (old JIS)
CAC502A (PBC2A)/CAC502B (PBC2B): It has good corrosion resistance, wear resistance and mechanical properties, especially its hardness is better than other bronzes. Gears, worm gears, bearings, bushings, sleeves, impellers, mechanical parts, etc.
CAC503A (PBC3A)/CAC503B (PBC3B) has good corrosion resistance, wear resistance and mechanical properties, and is even harder than CAC502. Slides, hydraulic cylinders, gears, bushings, mechanical parts, etc.
Main components of phosphor bronze castings (%)
Symbol (old JIS)
CAC502A (PBC2A) Copper: 87.0~91.0; Tin: 9.0~12.0; Phosphorus: 0.05~0.2;
CAC502B (PBC2B) Copper: 87.0~91.0; Tin: 9.0~12.0; Phosphorus: 0.15~0.5;
CAC503A (PBC3A) Copper: 84.0~88.0; Tin: 12.0~15.0; Phosphorus: 0.05~0.2;
CAC503B (PBC3B) Copper: 84.0~88.0; Tin: 12.0~15.0; Phosphorus: 0.15~0.5.
