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Metal machining can be defined as a manufacturing process in which cutting tools are used to remove unwanted metals from metal workpieces and convert them into the shape required. Metal machining includes various machining processes such as turning, milling, drilling, and grinding, which are used to shape and finish metal workpieces to meet specific requirements and specifications.

Metal stampings are components produced by placing flat sheets of metal into a stamping press. It is an intricate procedure that may involve several metal-forming methods, such as punching, bending, piercing, and blanking. Metal stamping parts are mainly used for supporting other parts of products or as function parts. They are also used as enclosures to cover the products.

Copper wire is a type of electrical conductor made from copper metal and is widely used in electrical wiring in various industrial applications, such as building and construction, power generation, telecommunication, and transportation. The copper wires offer superior electrical transmission with hardly any resistance and require less insulation. Copper wires are widely used in creating copper cables, where multiple copper wires are assembled into a standard jacket.

Iron castings refer to objects or components that are produced by pouring molten iron into a mold and allowing it to solidify and take the shape of the mold.

金属行业：铝启新程－铝产业链之七问七答-长江证券

钼（Molybdenum，化学符号Mo）是1778 年由瑞典化学家C.W Scheele 首先从辉钼矿（MoS2）中提炼出来的一种金属元素。 位于元素周期表第五周期第6族（铬分族），为过渡金属元素。 Ø 钼金属具银白色金属光泽，具备高强度、高熔点、高硬度、 导热导电性能好、耐研磨、热膨胀系数小、抗腐蚀性能强等 优良特性，不可替代性强。

黄金是与股票、债券截然不同的大类资产，因其不提供贴现价值，也不同于其他大宗商品，因其对工业需求不够敏感。 黄金具有货币、金融、避险属性，这些属性之间相互交集，对应到抵抗通胀和危机两种情形（危机发生早期黄金只有相对收益），这些特征对 应到黄金的底层买入逻辑——保值。