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to 107C). Te alloy shows fair fluidity with little tendency toward hot tearing. Machinability—Te machinability


of this alloy is excellent. Despite its high ductility, there is little tool drag. Machining is possible immediately following casting. An excellent surface finish is produced, especially when


machined with carbide tools at maxi- mum speeds. Finishing—Because of this alloy’s


high resistance to corrosion, cast- ings produced from it will not require any further surface treatment for most applications. However, it can be satin-anodized or chrome-plated for


additional corrosion protection. Alloy 535.0 also can be anodized in a variety of colors. Te lack of silicon in the al- loy provides satisfactory coloration. Weldability—Alloy 535.0 can be


welded by any of the inert gas or shield- ed arc methods using filler material of 5356, 5183 or 1100 welding wire or rod, or using clean scrap or cast pieces of 535.0. Fluxes should be avoided. Consequently, fusion-welding processes requiring fluxes are not recommended. Corrosion Resistance—Because of the almost complete absence of heavy metals, the corrosion resistance of 535.0 is extremely high. In addition, it is rela- tively high magnesium content allows for further protection against corrosion from mild alkalis or salt spray.


Alloy 712.0 Alloy 712.0 is employed when


a combination of good mechanical properties without heat treatment is needed. It also shows good shock and corrosion resistance, machinability and dimensional stability. No distortion is exhibited when 712.0 is heated. After brazing, the alloy will regain its original strength by natural aging. Te alloy is used for marine castings, farm machin- ery, machine tool parts and other ap- plications in which the part must have good strength or impact resistance. Castability—Alloy 712.0 has fair to


good castability. Although its pressure tightness and resistance to hot crack- ing are only fair, the alloy’s fluidity and solidification shrinkage tendency are rated as good. Machinability—Te machining


characteristics of this alloy are excel- lent. Fast speeds and feeds and wear- resistant tools correctly ground for cutting aluminum are recommended. Finishing—Polished finishes are


good. Te anodized finish is good, and the color is medium golden yellow. Weldability—Welding characteristics


are fair for most common methods. Te alloy is recommended for brazing. Corrosion Resistance—Te alloy has


good natural resistance to corrosion, and good additional protection is received from chemical conversion coatings.  Tis was excerpted from “Designing & Purchasing Metal Castings” published by the American Foundry Society.


46 | METAL CASTING DESIGN & PURCHASING | Jul/Aug 2016


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