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.
Investigating Microporosity Formation in Low-Lead Cu-Based Alloys: Understanding the parameters that influence the behavior of bismuth in solution is paramount when attempting to optimize its porosity-reducing effects in copper alloys
Leaded alloy substitutes are more prone to spots or cracks.
Converting to Low-Lead Copper Casting: Three Foundries' Experiences
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.
Regulations driving foundries to minimize and treat wastes
So, the brass scrap stream now contains leaded alloys and lead-free alloys that contain new elements not before present on a significant scale.
Viability of the Copper-Alloy Scrap Stream: Copper-base scrap provides about one-third of the copper consumed in the U.S. each year, and changes to material being recycled could have a significant affect on the scrap Stream
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.
The deadly sins of Pb-free assembly: repent, for you too are guilty of process mistakes
Cross contamination with leaded material is detrimental and is a major concern if bismuth alloys get into leaded alloys also.
Divison notebook: copper group promotes no-lead alloy options
In most cases, few pattern changes are required when switching from leaded alloys. Melting and pouring procedures will not vary greatly from the leaded alloys.
Several no-lead copper alloy options for water components: metalcasters have a variety of no-lead copper alloys to choose from to make cast components for potable water systems, and each alloy requires specific practices when converting from leaded alloys
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.
New alternative low-lead copper alloy shows promise: C83470 is viable option to produce castings that will be in compliance with the Safe Drinking Water Act or other standards requiring casting to be low in lead
Leaded alloys also are more castable than their no-lead counterparts.
Transitioning to no lead copper: no-lead copper alloys solidify differently than leaded alloys, so metalcasters must gather information and test the materials to make the switch successfully
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 workshop helps metalcasting facilities move toward no-lead goals
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.
How to handle lead-free Copper-bismuth alloys
PANEL: Case Studies in the Use of Solidification Modeling to Transition Away From Leaded Alloys (10-160)
Technical Program
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