IS 318 specifies requirements for leaded tin bronze ingots and castings. These alloys are widely used for bearings, bushings, valve seats, and pump components due to their excellent wear resistance and anti-friction properties.
Specification for leaded tin bronze ingots and castings covering chemical composition, mechanical properties, casting quality, and testing requirements for various grades used in engineering applications.
Key Values
LTB 2 tensile strengthMin 180 MPa
LTB 2 elongationMin 8%
Tin content (LTB 2)9.0 - 11.0%
Practical Notes
! LTB 2 is the most commonly used grade for general-purpose bearings in India.
! Lead content improves machinability and bearing properties but environmental regulations are tightening — check compliance.
! Always specify grade clearly in procurement — different grades have very different wear and strength properties.