QC/T 273-2025 English PDF
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QC/T 273: Historical versions
| Standard ID | USD | BUY PDF | Delivery | Standard Title (Description) | Status |
| QC/T 273-2025 | 350 | Add to Cart | Auto, 9 seconds. | Technical specifications of aluminum-alloy die casting for automobiles | Valid |
| QC/T 273-1999 | 319 | Add to Cart | 3 days | (Automotive zinc alloy, aluminum alloy, copper alloy die castings) |
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QC/T 273-2025: Technical specifications of aluminum-alloy die casting for automobiles
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/QCT273-2025QC AUTOMOTIVE INDUSTRY STANDARD ICS 43.020 CCS T 04 Replacing QC/T 273-1999 Technical specifications of aluminum-alloy die casting for automobiles Issued on: MAY 09, 2025 Implemented on: NOVEMBER 01, 2025 Issued by. Ministry of Industry and Information Technology of the People's Republic of China
Table of Contents
Foreword... 3 1 Scope... 5 2 Normative references... 5 3 Terms and definitions... 6 4 Heat treatment state codes... 7 5 Die casting classification... 7 6 Technical requirements... 8 7 Inspection methods... 12 8 Inspection criteria... 13 9 Marks, packaging... 17 Annex A (informative) Requirements for commonly used die-cast aluminum alloy compositions... 18 Annex B (informative) Values for mechanical properties of commonly used die-cast aluminum alloys... 21 Annex C (normative) Testing of porosity and maximum pore size on machined surfaces and metallographic cross-sections of die-cast parts... 22 Technical specifications of aluminum-alloy die casting for automobiles1 Scope
This document specifies the technical requirements, inspection methods, inspection rules, marks, and packaging of aluminum alloy die castings. This document applies to aluminum alloy die castings for automotive applications.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 228.1, Metallic materials -- Tensile testing -- Part 1.Method of test at room temperature GB/T 231.1, Metallic materials -- Brinell hardness test -- Part 1.Test method GB/T 6060.3, Butadiene for industrial use -- Determination of trace water -- Coulometric Karl Fischer method GB/T 6414, Castings -- Dimensional tolerances and geometrical tolerances and machining allowances GB/T 7999, Optical Emission Spectrometric Analysis Method of Aluminum and Aluminum Alloys GB/T 11351, Mass tolerances of casting GB/T 13298, Inspection Methods of Microstructure for Metals GB/T 13822, Test samples for nonferrous diecasting alloys GB/T 15056, Casting surface roughness -- Appraising method GB/T 15114, Aluminum alloy die castings GB/T 20975 (all parts), Methods for chemical analysis of aluminium and aluminium alloys GB/T 36589, Casting -- Industrial computed tomography (CT) testing JB/T 7946.2, Metallograph of cast aluminium alloys -- Part 2.Cast aluminium- silicon alloys burning HB/Z 61, Penetration testing ISO 3522, Aluminium and aluminium alloys – Castings -- Chemical composition and mechanical properties JIS H5302, Aluminium alloy die castings ASTM B85/B85M, Standard specification for aluminium‑alloy die castings ASTM E505, Standard reference radiographs for inspection of aluminum and magnesium die castings EN 1706, Aluminium and aluminium alloys -- Castings -- Chemical composition and mechanical properties3 Terms and definitions
For the purposes of this document, the terms and definitions defined in GB/T 1800.1 apply. 3.1 high stress zone The area in the CAE stress analysis cloud map of the casting where the value is greater than or equal to 60% of the minimum yield strength of the material. 3.2 functional zone The area that castings require sealing and assembly. NOTE. Such as threaded holes and bearing mounting surfaces. 3.3 non-critical zone Areas on the casting other than high stress zones and functional zones. 3.4 separately cast test sample Standard casting samples that are obtained by using the same furnace of molten aluminum as the production castings, and by employing the same casting method and heat treatment process as the production castings. 3.5 test sample from casting A sample cut directly from the casting body and machined. 3.6 porosity The percentage of the total area of pores within the reference envelope shape to the area of the selected reference surface. 3.7 maximum pore size The maximum circumscribed circle diameter of a single hole.4 Heat treatment state codes
Typically, die-cast parts are supplied in the as-cast state. However, some vacuum die- cast parts require heat treatment to achieve specific mechanical properties. The heat treatment condition designations are as follows. F - As-cast state; O - Annealed state; T4 - Solution treatment plus natural aging; T5 - Controlled cooling plus artificial aging; T6 - Solution treatment plus fully artificial aging; T64 - Solution treatment plus insufficient aging; T7 - Solution treatment plus stabilization treatment.5 Die casting classification
Aluminum alloy die castings are classified into the following three categories according to the load they bear and working conditions, and shall meet the requirements of Table 1.6 Technical requirements
6.1 Die casting method and heat treatment state 6.1.1 The die casting method (high pressure casting, vacuum high pressure casting) and heat treatment condition of the casting shall be agreed upon by the supplier and the purchaser. 6.1.2 Die castings are typically supplied in the as-cast state. For die castings that require heat treatment to meet special application requirements, the heat treatment process shall be agreed upon by the supplier and the purchaser. 6.1.3 Mark the heat treatment state code on the drawings or technical agreement as per Chapter 4. 6.2 Chemical composition The chemical composition of die-cast aluminum alloys shall conform to GB/T 15114 or the relevant material standards and technical agreements agreed upon by both the supplier and the purchaser. Annex A lists the composition requirements for commonly used die-cast aluminum alloys in the automotive industry. 6.3 Mechanical properties 6.3.1 When using separately cast test samples for testing, the mechanical properties shall conform to GB/T 15114 or other standards and technical agreements agreed upon by the supplier and the purchaser. Annex B contains the mechanical property values of commonly used die-cast aluminum alloys in the automotive industry. 6.3.2 When testing with test samples from casting, their mechanical properties shall meet the requirements of the drawings or technical agreements agreed upon by both the supplier and the purchaser. 6.3.3 Perform hardness testing on designated areas of the die casting. The hardness value shall conform to the standards, drawings, or technical agreements adopted by both the supplier and the purchaser. 6.3.4 For Class III die castings, mechanical properties may not be used as an acceptance criterion. Whether mechanical properties are used as an acceptance criterion for other types of die castings shall be agreed upon by the supplier and the purchaser based on the usage requirements of the die castings. 6.4 Microstructure 6.4.1 Whether the microstructure of the die-cast parts shall be used as an acceptance criterion shall be agreed upon by the supplier and the purchaser. 6.8.1 The airtightness requirements of die castings shall comply with the provisions of the drawings or technical agreements agreed upon by both the supplier and the purchaser. 6.8.2 Subject to the consent of the purchaser, the supplier may perform one impregnation or leakage repair treatment on the die casting without affecting its use. 6.9 Repair and correction of die-cast parts 6.9.1 Surface defects in die-cast parts may be removed by grinding. However, the dimensions after grinding must meet the dimensional tolerances of the die-cast parts. Furthermore, the roughness of the ground area must conform to the specifications agreed upon by both the supplier and the purchaser in the drawings or technical agreement. 6.9.2 With the purchaser's consent, mechanical shaping and straightening of die-cast parts are permitted. After straightening, the supplier shall conduct a comprehensive penetrating inspection of the die-cast parts surface to confirm the absence of cracks. 6.9.3 With the consent of the purchaser, die-cast parts may be repaired by welding. The welding wire, welding location, area, depth, and number of welds shall be agreed upon by both the supplier and the purchaser. Die-cast parts requiring heat treatment shall undergo heat treatment after the welding repair is completed.7 Inspection methods
7.1 Chemical composition The chemical composition testing methods for die castings shall be in accordance with GB/T 20975 (all parts) or GB/T 7999.Other testing methods are permitted provided that the accuracy of the analysis is guaranteed. In case of disputes over the analytical results, arbitration shall be conducted in accordance with GB/T 20975 (all parts). 7.2 Mechanical properties 7.2.1 Mechanical property testing shall be conducted in accordance with GB/T 228.1. The test samples shall be separately cast test samples or test samples from casting cut from die-cast parts. 7.2.2 Hardness testing shall be performed in accordance with GB/T 231.1. 7.3 Microstructure 7.3.1 Microstructure testing shall be conducted in accordance with GB/T 13298. 7.3.2 The overheating condition of the heat-treated die castings shall be tested according to JB/T 7946.2. 7.4 Dimensions Dimensional inspection of die-cast parts can typically be performed using conventional inspection tools and methods such as 3D scanning and coordinate measuring machines. Dimensions of deep cavities and internal structural features that are difficult to measure can be inspected using CT scanning or sectioning methods. 7.5 Surface quality 7.5.1 The roughness rating of the unmachined surfaces of die castings shall be in accordance with GB/T 15056. 7.5.2 The surface roughness of die castings that require shot peening, shot blasting, or sandblasting shall conform to the requirements of GB/T 6060.3. 7.5.3 When surface cracks of die castings need to be tested by penetrant testing, the requirements of HB/Z 61 shall apply. 7.6 Internal quality 7.6.1 When using X-rays to inspect the internal defects of die castings, the rating of defects such as internal porosity, looseness, and inclusions shall be in accordance with ASTM E505.Appropriate and reliable X-ray flaw detection methods shall be developed for different die castings to ensure the accuracy of the inspection results. 7.6.2 When metallographic sectioning is used to inspect internal defects (porosity, pore size) in die castings, the sectioning location shall be agreed upon by both the supplier and the purchaser. The section to be inspected shall be pre-ground and metallographically polished, and shall comply with the provisions of Annex C. 7.6.3 When using CT to detect internal defects in die castings, the procedure shall be in accordance with GB/T 36589. 7.6.4 When there is a dispute over the X-ray testing results, the CT testing method shall be used as the arbitration method. 7.7 Airtightness The airtightness of die-cast parts can be tested using dry methods (such as leakage testing) and wet methods (such as water immersion method). The testing method shall be agreed upon by the supplier and the purchaser.8 Inspection criteria
8.1 Batching rules Die castings produced in the same smelting furnace, casting shift, and heat treatment ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
