Occasionally customers request a leaded alloy
, but LA Pump and Valve details the benefits of its "upgraded" alloy and converts the customer to no-lead copper casting.
Chicago Faucet Co, a green sand foundry pouring a copper-base leaded alloy
, employs a reclamation system that reclaims sand and recovers alloy for remelting.
67Sn Sn = 3% Bronze Sn = 3Zn Sn = 3% Copper Zn<3% and Sn<3% Copper/brass 3% = Zn<8% and Sn<3% Leaded alloys
Pb>8% (Leaded) alloys 8% = Pb = 4% Table 2.
also are more castable than their no-lead counterparts.
As new environmental legislation limits the lead content in castings, especially in water applications, more users are demanding non - leaded alloys
for other applications.
Copper-bismuth alloys were developed to behave in the metalcasting process and have properties similar to existing leaded alloys
PANEL: Case Studies in the Use of Solidification Modeling to Transition Away From Leaded Alloys
The lead-free alloys were developed to have foundry characteristics (melting and casting) as well as properties (physical and mechanical) similar to existing leaded alloys
This new rule will force many foundries to begin reporting on lead-especially those melting leaded alloys
or contaminated scrap.
The use of low-lead alloys as a substitute for leaded alloys
is not solely contingent upon the new alloys' machinability and castability.
By getting away from the leaded alloys
, we eliminated a lot of headaches and another hurdle we would need to get over to do the things we really wanted to accomplish.
Also, a study at the Univ of Florida on treating the surface of leaded alloys
to reduce the pickup potential has been completed.