Stripping, metallurgy

Uses. The major uses of metallic zinc are in the manufacture of alloys and in the use of zinc as a protective coating on other metallic products, notably iron and steel. Lesser quantities are employed in the manufacture of dry-cell batteries, sinks, gutters, cornices, weather strips, and so forth. The use of zinc in connection with the metallurgy of lead has already been described. In chemical laboratory work, zinc is one of the most widely used reducing agents. 

Available forms Powder that can be consolidated into rods, wires, or strips by powder metallurgy. Annealed metal is very ductile and can be bent, coiled, or rolled. Single crystals 2 inches x 0.05-0.005 inch diameter. 

Determination of minimum speed is only important if strips with tightly controlled thickness are to be made between smooth rollers, e.g. in powder metallurgy. In other applications, e.g. the compaction of fertilizers, the problem of minimum speed may be circumvented by selecting a narrow static gap and adjusting the hydraulic pressure such that, when feed is introduced into the nip, the clearance increases to the operating gap and, at the same time, the pressure rises to the operating level. 

Lamicol, M., Crahay, J., and Renard, M. "Rapid Heating of Low Carbon Strips by Impinging Burners Recent Developments and Synthesis." Revue de Metallurgie 102, no. 5 (2005) 379-84. 

C. Chang, H. Gu and T.J. O Keefe, Galvanic Stripping of Iron from Solvent Extraction Solutions from Zinc Residues Leaching , Iron Control and Disposal. J.E. Dutrizac and G.B. Harris, Eds., Canadian Institute of Mining, Metallurgy and Petroleum, Montreal, Canada, 1996, 417-428. 

The tooling setup is composed of cutters or knives, spacers, strippers, fillers, and shims, generally arranged with the male and female cutters alternating on the top and bottom arbors. As mentioned earlier, the distance between the female cutters establishes the finished strip width, so the horizontal clearance is subtracted from the width of the male cut. The amount of horizontal and vertical clearance required is a function of strip thickness and metallurgy. 

Brass is the most used alloy of copper metal. Normally brass is copper alloyed with zinc. There are two types of this alloy, a-brass and a/ 3-brass. At room temperature, copper can dissolve up to 38% zinc in solid solution. In physical metallurgy this phase is called the a-phase. An alloy with 37% zinc, the most common brass, thus consists entirely of the a-phase, and is also called a-brass. It is used as sheet metal and strip for all types of cold forming. For deep drawing, which is especially difficult for the material, the zinc content is decreased to 30%. 

Titanium-nickel is most commonly used in the form of cold drawn wire (down to 0.02 mm) or as barstock. Other commercially available forms not yet sold as standard product would include tubing (down to 0.3 mm OD), strip (down to 0.04 mm in thickness), and sheet (widths to 500 mm and thicknesses down to 0.5 mm). Castings (Ref 4), forgings and powder metallurgy (Ref 5) products have not yet been brought fi om the research laboratory. 

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