GB/T 25748-2025 PDF English
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GB/T 25748-2025: Die casting magnesium alloys
---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/GBT25748-2025GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.120.20 CCS J 31 Replacing GB/T 25748-2010 Die casting magnesium alloys Issued on: DECEMBER 02, 2025 Implemented on: JULY 01, 2026 Issued by. Status Administration for Market Regulation; National Standardization Administration.
Table of Contents
Foreword... 3 1 Scope... 5 2 Normative references... 5 3 Terms and definitions... 6 4 Alloy designations and codes... 6 5 Technical requirements... 7 6 Test methods... 9 7 Inspection rules... 9 8 Marking, quality certificates, packaging, transportation and storage... 10 Appendix A (Informative) Comparison of Major Die-Cast Magnesium Alloy Designations in China and Abroad... 13 Appendix B (Informative) Mechanical properties of die-cast magnesium alloy specimens... 14 Appendix C (Informative) Physical Properties of Die-Cast Magnesium Alloys... 15 Die casting magnesium alloys1 Scope
This document specifies the designations, codes, technical requirements, test methods, inspection rules, marking, quality certificates, packaging, transportation, storage of die- casting magnesium alloy ingots. This document is applicable to the production and inspection of die-casting magnesium alloy ingots. Magnesium alloy granules can be handled in accordance with this document.2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions 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 5611 Foundry Terminology GB/T 13748.1 Chemical analysis methods of magnesium and magnesium alloys - Part 1.Determination of aluminum content GB/T 13748.4 Chemical analysis methods of magnesium and magnesium alloys - Part 4.Determination of manganese content - Periodate spectrophotometric method GB/T 13748.8 Chemical analysis methods of magnesium and magnesium alloys - Part 8.Determination of rare earth content - Gravimetric method GB/T 13748.9 Chemical analysis methods of magnesium and magnesium alloys - Part 9.Determination of iron content - o-Phenanthroline spectrophotometric method GB/T 13748.10 Chemical analysis methods of magnesium and magnesium alloys - Part 10.Determination of silicon content - Molybdenum blue spectrophotometric method GB/T 13748.11 Chemical analysis methods of magnesium and magnesium alloys - Determination of beryllium content - Solochrome cyanine R spectrophotometric method GB/T 13748.12 Chemical analysis methods of magnesium and magnesium alloys - Part 12.Determination of copper content GB/T 13748.14 Chemical analysis methods of magnesium and magnesium alloys - Part 14.Determination of nickel content - Dimethylglyoxime trophotometric method GB/T 13748.15 Chemical analysis methods of magnesium and magnesium alloys - Part 15.Determination of zinc content GB/T 13748.16 Chemical analysis methods of magnesium and magnesium alloys - Determination of calcium content - Flame atomic absorption spectrometric method GB/T 13748.20 Methods for chemical analysis of magnesium and magnesium alloys - Part 20.Determination of elements content - Inductively coupled plasma atomic emission spectrometric method GB/T 13748.21 Chemical analysis methods of magnesium and magnesium alloys - Part 21.Determination of elements by photoelectric direct reading atomic emission spectrometry GB/T 30512 Requirements for prohibited substances on automobiles3 Terms and definitions
The terms and definitions defined in GB/T 5611 are applicable to this document.4 Alloy designations and codes
4.1 Method of representing alloy designations Die-cast magnesium alloy designations are composed of the chemical symbols of magnesium and the main alloying elements. The main alloying elements are followed by numbers indicating their nominal mass fraction (the nominal mass fraction is the rounded integer value of the average mass fraction of that element). The letters "Y" and "Z" (the first letters of the Pinyin of the Chinese words for "die- casting") precede the alloy designation to indicate that it is a die-cast magnesium alloy. The last letter is used to distinguish different alloys with the same nominal mass fraction of the main alloying elements but slightly different contents of other elements (see Table 1 for specific differences). 4.2 Method of representing alloy codes In the alloy designation, "YM" (where "Y" and "M" are the first letters of the Pinyin of the Chinese words for "die-casting" and "magnesium," respectively) indicates a die-cast magnesium alloy. The first digit after YM (1, 2, 3, 4, 5, 6) represents the MgAlSi, MgAlMn, MgAlZn, MgAlRE, MgAlSr, MgAlCa series alloys, respectively, representing the alloy series. The second and third digits after YM are sequential numbers. The designation method is as follows. Example. YM102 represents die-cast magnesium alloy MgAlSi series alloy No.02.5 Technical requirements
5.1 Chemical composition The chemical composition of die-cast magnesium alloys shall conform to the requirements of Table 1. Note. For ease of use, Appendix A provides a comparison of major die-cast magnesium alloy designations at home and abroad. mechanical properties of die-cast magnesium alloys are shown in Appendix B; the physical properties of die-cast magnesium alloys are shown in Appendix C. 5.4 Prohibited substances The prohibited substances in die-cast magnesium alloys shall comply with the requirements of GB/T 30512.6 Test methods
6.1 Chemical composition The test methods for the content of Al, Mn, RE, Fe, Si, Be, Cu, Ni, Zn, Ca, Sr in die- cast magnesium alloy ingots shall be carried out according to the provisions of GB/T 13748.1, GB/T 13748.4, GB/T 13748.8, GB/T 13748.9, GB/T 13748.10, GB/T 13748.11, GB/T 13748.12, GB/T 13748.14, GB/T 13748.15, GB/T 13748.16, GB/T 13748.20, GB/T 13748.21.Other methods are permitted provided that the analytical accuracy is ensured. 6.2 Surface quality The surface quality of die-cast magnesium alloy ingots shall be inspected visually. 6.3 Microstructure, mechanical properties, salt spray corrosion resistance The test methods for the microstructure, mechanical properties, salt spray corrosion resistance of die-cast magnesium alloy ingots shall be agreed upon by both the supplier and the buyer. 6.4 Prohibited substances The test methods shall be carried out according to the provisions of GB/T 30512.7 Inspection rules
7.1 Inspection items The inspection items are shown in Table 2. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
