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
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.
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
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.
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.
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
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.
Q Can we use existing gating and casting methods to cast lead-free copper alloys?
This new rule will force many foundries to begin reporting on lead-especially those melting leaded alloys or contaminated scrap.
EPA issues Final Rule on TRI Reporting Threshold for Lead
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