GB/T 40382-2021Recycling materials for wrought aluminium alloys (English PDF)

1 Scope

China's national standard for wrought aluminium alloy recycling materials. It specifies the terms and definitions, the classification and the requirements. Aluminium recycling saves about ninety-five per cent of the energy of primary production, which is the largest saving of any common material, and that alone would make the trade important. The technical constraint is that aluminium alloys cannot be separated from each other once mixed, because the alloying elements cannot economically be removed from the melt - so a mixed scrap stream can only be used for casting alloys, which tolerate a wide composition, and the higher value wrought alloys need scrap that was sorted before melting. That is what this standard is about: defining the grades of wrought alloy scrap by alloy family and by contamination so that a remelter can charge them to make wrought product again, rather than downcycling everything into castings.

This document specifies the classification, requirements, test methods, inspection rules, enter-factory inspection and acceptance, packaging, transportation, storage, quality certificate and order (or contract) contents of recycling materials for wrought aluminium alloys. This document applies to the wrought aluminium alloy raw materials for melting and casting (hereinafter referred to as raw materials) obtained after recycled aluminium is sorted and processed.

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

GB/T 7999, Optical emission spectrometric analysis method of aluminium and aluminium alloys

GB/T 8005.1, Aluminium and aluminium alloy terms and definitions -- Part 1. Product and method of processing and treatment

GB/T 8170, Rules of rounding off for numerical values and expression and judgement of limiting values

GB/T 17432, Methods of sampling for analyzing the chemical composition of wrought aluminium and aluminium alloys

3 Terms and definitions

For the purposes of this document, the terms and definitions defined in GB/T 8005.1 as well as the followings apply.

3.1 recycling materials for wrought aluminium alloys The recycled aluminium is processed by sorting and other processes to obtain the deformed aluminium alloy raw material for melting and casting that meets the relevant requirements of this document.

3.3 volatile substance A substance that can be separated from raw materials by appropriate heating at a temperature below the melting point of the metal.

3.4 metal recovery rate The proportion of aluminium alloy produced after the raw materials are pretreated and smelted according to the methods specified in this document, expressed as mass fraction.

4 Classification

4.1 The raw material category, raw material description, raw material source, ingredient type and raw material packaging method are shown in Table 1.

4.2 The size specifications and net weight of the recycled aluminium ingots shall be determined by negotiation between the supplier and the purchaser. The size specifications and net weight of other raw materials are shown in Table 2.

7 Inspection rules

7.1 Inspection and acceptance The supplier shall inspect the product before it leaves the factory. Ensure that the product quality complies with the provisions of this document and the order (or contract). Fill in the quality certificate.

8 Enter-factory inspection and acceptance

The purchaser shall conduct enter-factory inspection and acceptance according to Annex H.