Leaded commercial bronze C31400 combines the natural corrosion resistance of C22000 with the machinability typical of leaded brasses. Like C22000, it is an alpha brass nominally composed of 89% copper and 9% zinc, but it also contains approximately 2% lead to impart free-cutting characteristics. The relatively low zinc content of C31400 provides excellent corrosion resistance in potable water applications along with a pleasing golden color that matches C22000 hardware. Alloy C31400 is also suitable for outdoor use due to its resistance to stress corrosion cracking and to corrosion in general, but where the highest strength is not required.

Characteristics

Hot and Cold Working

C31400 has poor hot workability due to its lead content, so hot working is not recommended; however, it can be successfully hot extruded into rod products. Although it is primarily used for high-speed screw machining, it has good cold workability, sustaining a moderate degree of cold work.

Joining

Joining by soldering is excellent and by brazing is good. The lead content prevents successful welding.

Typical Uses

Screws, screw machine parts, pickling crates, and architectural hardware.