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See Chinese contents: GB/T 40123-2021 GB/T 40123-2021: Aluminium and aluminium alloy billet with high purity and fine grain
This Standard specifies product classification, quality assurance, technical requirements, test methods, inspection rules, marks, packaging, transportation, storage, quality certificates and purchase order (or contract) content for aluminium and aluminium alloy billet with high purity and fine grain. This Standard is applicable to aluminium and aluminium alloy (except 4?????? aluminum alloy) solid billet with high purity and fine grain (hereinafter referred to as the billet), which are used for 3C electronic high-quality surface materials, automotive high-performance forged wheels, porous micro-channel flat tubes.
