leaded alloy

leaded alloy

[′led·əd ′al‚ȯi]
(metallurgy)
An alloy, especially of brass, bronze, or steel, to which lead is added to improve machinability and mechanical properties.
References in periodicals archive ?
The measured solidification range for the bismuth-containing alloy was approximately 90[degrees]F (50[degrees]C) greater than the leaded alloy solidification range and approximately 81[degrees]F (45[degrees]C) smaller than the lead/bismuth free alloy The liquidus of the bismuth containing alloys was lower than both the leaded and lead/bismuth free alloys.
Leaded alloy substitutes are more prone to spots or cracks.
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.
Besides the solder pot heater and pot materials, there are thermal switches, pumps, floats (remember, Pb-free is less dense than leaded alloys) and myriad other little "gotchas." To avoid problems, talk to an expert on your specific machine, model, and option configuration; do not trust generalities.
Cross contamination with leaded material is detrimental and is a major concern if bismuth alloys get into leaded alloys also.
While some existing gating and risering techniques designed for traditional leaded alloys, such as C83600, were successful without modification, other casting geometries required larger ingates.
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. However, no-lead alloys can be more difficult to cast than their leaded counterparts, so metalcasting facilities may need to make some changes in their practices when using them.
PANEL: Case Studies in the Use of Solidification Modeling to Transition Away From Leaded Alloys (10-160)