根据中钢协数据，7 月中旬全国重点企业粗钢日均产量 168.97 万吨，旬环比变动-0.85%；预估全国粗钢日均产量 225.32 万吨，旬环比持平。截至上周末，社会库存总计 884.688万吨，周环比上升 1.26%；分产品来看，现螺纹钢、热轧板卷的库存分别为 385.3、187.7万吨，周变动幅度分别为 1.47%、1.83%。截止 7 月中旬末，中钢协统计重点钢铁企业钢材库存为 1396.88 万吨，比上一旬增加 17.01 万吨；环比变动 1.23%。

The mining, production, and usage of copper saw a rising trend since 2004 due to the rise in the global economy. The global market for copper metal (produced from refined copper and recycled scrap) is projected to grow at 4.2% each year through 2019 to reach 36 million metric tons, valued at $261 billion.

Aluminum extrusion is a method in which aluminum alloy billets are heated to 800-925 °F and subject to the extrusion process. Extruded aluminum includes mill finished, anodized, and powder-coated aluminum. Aluminum extrusions are used in many sectors, such as the construction, transportation, electrical, machinery, and consumer durables, due to their high strength, flexibility, and durability. Aluminum extrusion products are 100% recyclable and do not emit hazardous gases during processing. This helps manufacturers and builders attain green status for their projects.

Metal additive manufacturing is a technique in which a scanned or digitally designed object is formed into a 3D solid using an additive process. In this process, metal powder is applied in successive layers with little wastage and subject to a concentrated energy source that melts and shapes the metal. Additive manufacturing products can be built from various materials, plastic and metals being the most common materials.