High Lead Tin Bronzes Load Speeds

The bronze alloys are categorized by their most desirable properties they offer for specific applications.  This series of blog posts will highlight each category and specify their advantages.

High-lead tin bronzes: High speeds, low loads

The lead content is above 12% and higher and are best suited to meet high surface speeds but with low loads since they are considered to be more plastic in nature. Conform readily to imperfections on mated parts.  Do not require a hardened shaft and have the least galling tendencies.

The design working load of these alloys can be taken at 1500 PSI and can accommodate surface speeds through 1000 fpm. The permissible static load can be taken at 6000 PSI.

The average physical properties are:

Brinell Hardness : 50 to 60 BHN

Coefficient of friction (dry):  0.15

Minimum recommended shaft hardness:  165 BHN

Maximum operation tempature: 450 degrees F

Principle Uses: Turbine bearings, compressors, pumps, rotors, seals and where loads are free from shock and impacts, where lubrication is less than ideal and speeds are well over 70 fpm.