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For high volume process annealing, gas fired conveyor furnaces are often used. For large workpieces or high quantity parts, car-bottom furnaces are used so workers can easily move the parts in and out. Once the annealing process is successfully completed, workpieces are sometimes left in the oven so the parts cool in a controllable way.
Different draw ratios for brass cartridge case Season cracking is a form of stress-corrosion cracking of brass cartridge cases originally reported from British forces in India. During the monsoon season, military activity was temporarily reduced, and ammunition was stored in stables until the dry weather returned.
Annealing is the heat-treatment used to make the metal soft again. If metal is work-hardened, and not annealed occasionally, the metal will crack and weaken the work. Silversmiths can use casting techniques to create knobs, handles and feet for the hollowware they are making.
This allows for easier shaping of the metal. In order to keep this uniformity within the metal, it is cooled rapidly. This prevents the atoms from moving around and causing tension in the structure of the metal. Unlike ferrous metals—which must be cooled slowly to anneal—copper can be cooled slowly in air or quickly by quenching in water.
Portuguese Malacca 1521–1557 bastardo; Malaysia tin hat money; Great Britain farthing and halfpenny 1684–1692; Thailand satangs from the 1940s. Zinc: Twelfth century Indian coins were made of zinc. Vietnamese cash coins of the 1800s were made of zinc, as was the Vietnamese Tonkin 1/600 piastre of 1905.
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