COATING FOR PROCESSING LOW-LEAD OR LEAD-FREE BRASS

Whitworth pipe thread DIN EN ISO 228
Specification: with spiral entry

- higher productivity

- better chip flow

- optimised lubricity results in reduced torque

- protection against adhesion

- high hardness and thermal stability

Lead is alloyed in copper materials such as brass to improve machinability. Due to the ever increasing demands in environmental and health regulations, legislation is increasingly banning the use of lead in drinking water systems.

Lead-free brass materials are known under the brand names ECOBRASS® or CUPHIN®. In contrast to traditional free-cutting brass (CuZn39Pb3), the machining of leadfree brass (CuZn21Si3P) poses new challenges for existing tools. Due to a higher adhesion tendency, higher cutting forces and tool temperatures occur. Chip breakage, which is a key property for process reliability, also eteriorates. This results in smearing on the rake face, chipping on the main cutting edge and spalling of the coating.