This adapter used on a control head of a power pallet truck is made from yellow brass. Converted from a fabrication of 13 components, this casting helped reduce cost savings by 25% and achieve required strength properties to fi ght wear and tear.
lead leaching into potable water and to replicate the high machinability and pressure tightness of leaded brass. T is is realized by substituting selenium and bismuth for lead. SeBiLoy I and II are red brasses, and SeBiLOY III is a yellow brass. Bronzes—Bronze is an imprecise
term. It originally referred to alloys in which tin was the major alloying element. Under the UNS system, the term bronze (C86100 to 87800, C90200 to C95900) applies to a broad class of alloys in which the principal alloying element is neither zinc nor nickel. As a result, bronze is the common name for a number of alloys that contain little, if any, tin. Manganese-Bronze (C86100 to C86800)—Manganese-bronze, which contains zinc (22-42%) as the major alloying element, is among the strongest cast copper alloys and is used for gears, bolts and valve stems. Where economi- cally feasible, aluminum-bronze replaces
manganese-bronze because it off ers high strength in combination with better cor- rosion resistance. Silicon-Bronze and Silicon-Brass
(C87300 to C87800)—Silicon-bronze and silicon-brass are alloys of zinc and silicon that have low melting points and high fl uidity, which favor perma- nent mold and diecasting. Because of its low lead content, silicon-bronze often is a replacement for leaded plumbing brasses, but its limited ma- chinability inhibits use in high-volume potable water systems. It is currently
being used as a substitute for semi-red brass in immersed pumps. Tin-Bronze (C90200 to C91700)—Tin-bronze is an al- loy of copper and tin with good aqueous corrosion-resistance. Additional attributes include high strength, good wear resistance and
a low friction coeffi cient compared to steel. T is accounts for its use in bear- ings, piston rings and gear parts. Leaded Tin-Bronze (C92200
to C92900)—These alloys are a tin-bronze containing 0.3-6% lead.
Leaded tin-bronze offers the addi- tional advantage of free cutting. High-Leaded Tin Bronze (C93100 to C94500)—T is is a tin-bronze contain- ing 2-34% lead. High-leaded tin-bronze is used in sleeve bearings and bushings because the additional lead provides improved lubricity. Nickel-Tin-Bronze (C94700 to C94900)—T is is a tin-bronze containing 4-6% nickel. Nickel-tin-bronze is a versa- tile alloy that has the good wear resistance and corrosion resistance found in tin- bronzes with improved strength. Nickel- tin-bronze is used in bearings, gears, wear guides, pump and valve components, and motion and translation devices, such as shift forks and circuit breaker parts. Aluminum-Bronze (C95200 to C95900)—Aluminum-bronze has a complex metallurgical structure that imparts both strength and oxidiza- tion resistance due to the formation of alumina-rich protective fi lms. T ese al- loys are wear-resistant and exhibit good casting and welding characteristics. T eir corrosion resistance is superior in seawater, chloride and diluted acids. Applications are varied and include propellers and valves, pickling hooks, pickling baskets and wear rings. T e aluminum bronze alloys that contain nickel are desirable for fl uid-moving applications, such as pump impellers, because of superior erosion, corrosion and cavitation resistance. Copper-Nickel (C96200 to 96950)—
T ese alloys are simple solid solutions of nickel in copper without lead. T e copper-nickel alloys have excellent corrosion resistance in seawater, high strength and ease of manufacturing. T eir various applications include pumps, valves, ship tail shaft sleeves and other marine applications. Nickel-Silver (C97300 to C97800)—
T e presence of nickel accounts for these alloys’ silver luster. T ese alloys, which do not contain silver, off er good corrosion resistance, ease of castability and good machinability. Despite their
36 METAL CASTING DESIGN & PURCHASING 2014 CASTING SOURCE DIRECTORY
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