GB/T 23301-2024Cast aluminium alloys for automobile wheels (English PDF)

1 Scope

GB/T 23301-2024 is the Chinese material standard for the cast aluminium alloys used to make car wheels. A cast alloy wheel is a safety-critical component made by the tens of millions, and it is one of the few castings that has to survive both a fatigue life and an impact, which is why the alloy is specified separately from the wheel. The standard sets the alloy grades and their designation, the chemical composition and the limits on the impurities that matter to a casting, iron above all, the requirements on the form in which the alloy is supplied, the mechanical properties in the cast and heat treated conditions, the metallurgical quality requirements covering hydrogen content, inclusions and grain refinement and modification, the test methods including the sampling and the preparation of test bars, the inspection rules and the marking, packaging, transport and quality certificate. The 2024 edition replaces GB/T 23301-2009. For an alloy producer, a wheel foundry or a carmaker qualifying a supply in China, this is the specification.

This document specifies the grades and codes, technical requirements, test methods, inspection rules, as well as marking, quality certificates, packaging, transportation and storage of cast aluminum alloys for automobile wheels. This document applies to the production and inspection of cast aluminum alloys (including aluminum alloy liquid and aluminum alloy ingots) for automobile wheels.

2 Normative references

The provisions of the following documents constitute the essential clauses of this document through normative references in this text. Among them, for referenced documents with dates, only the versions corresponding to the dates are applicable to this document; for referenced documents without dates, the latest versions (including all amendments) are applicable to this document.

GB/T 5611 Foundry terminology

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

GB/T 8063 Designation of cast nonferrous metals and their alloys

GB/T 8170 Rules of rounding off for numerical values & expression and judgment of limiting values

GB/T 15115-2024 Die casting aluminum alloys

GB/T 20975.3 Methods for chemical analysis of aluminium and aluminium alloys - Part 3: Determination of copper content

GB/T 20975.4 Methods for chemical analysis of aluminium and aluminium alloys - Part 4: Determination of iron content

GB/T 20975.5 Methods for chemical analysis of aluminium and aluminium alloys - Part 5: Determination of silicon content

GB/T 20975.7 Methods for chemical analysis of aluminium and aluminium alloys - Part 7: Determination of manganese content

GB/T 20975.8 Methods for chemical analysis of aluminium and aluminium alloys - Part 8: Determination of zinc content

GB/T 20975.12 Methods for chemical analysis of aluminium and aluminium alloys - Part 12: Determination of titanium content

GB/T 20975.16 Methods for chemical analysis of aluminium and aluminium alloys - Part 16: Determination of magnesium content

GB/T 20975.17 Methods for chemical analysis of aluminium and aluminium alloys - Part 17: Determination of strontium content

3 Terms and definitions

The terms and definitions defined in GB/T 5611 apply to this document.

4 Alloy grades and codes

4.1 Alloy grades The designation method of grades of cast aluminum alloys for automobile wheels (hereinafter referred to as aluminum alloys) shall comply with the provisions of GB/T 8063.

4.2 Alloy codes The codes of aluminum alloys are expressed as follows: reference mechanical properties.

5 Technical requirements...