GB/T 1177-2018Casting magnesium alloys (English PDF)

1 Scope

GB/T 1177-2018 is the Chinese national standard on casting magnesium alloys, in the field of metallurgy. The /T suffix marks it as a recommended standard: it is not compulsory by itself, but it becomes binding as soon as a contract, a tender or a customer specification calls it up - which in practice is how most foreign buyers meet it. It was issued on 13 July 2018 by the State Administration for Market Regulation; Standardization Administration of China, and has been in force since 1 August 2018. Classification: ICS 77.120.20, CCS J31. This page is published from the official record of the standard held by the Chinese standards administration: the identification, the dates, the classification and the issuing body are taken from there. The clause text, the tables and the numeric limits are in the document itself, which is delivered complete in English translation.

This Standard specifies the designations and codes, technical requirements, test methods and inspection rules of casting magnesium alloys. This Standard is applicable to sand and metal casting magnesium alloys.

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 228.2, Metallic materials - Tensile testing - Part 2. Method of test at elevated temperature

GB/T 2039, Metallic materials - Creep and stress-rupture test in tension

GB/T 5678, Sampling methods of spectrochemical analysis for cast alloys

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

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

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 13748.6, Chemical analysis methods of magnesium and magnesium alloys - Determination of silver content - Determination of silver content - Flame atomic absorption spectrophotometric method

GB/T 13748.7, Chemical analysis methods of magnesium and magnesium represented by RE). The main alloy element is followed by a number indicating its nominal content (nominal content is the trimmed value of the average content of the element). If the nominal content of the alloy element is not less than 1, this number is expressed as an integer. If the nominal content of the alloy element is less than 1, generally no number shall be indicated. In the front of the alloy designation, the letter "Z" (the first letter of "casting" in Chinese pinyin) is used to indicate the casting alloy.

3.1.3 If there are more than two alloy elements, it is not necessary to list all the alloy elements in the designation except for the alloy elements which are essential to the characteristics of the alloy.

3.1.4 The main alloy elements in the designation are arranged in descending order of nominal content. When the nominal content is equal, they are arranged in alphabetical order according to their chemical symbols.

3.2 Alloy codes The alloy code in this Standard consists of the letters "Z" and "M" (they are the first letters of the Chinese alphabet for "casting" and "magnesium") and the numbers after it, where the number indicates the sequence number of the alloy. For ZM5A, the letter "A" indicates that the magnesium ingot used in the alloy is a high-purity magnesium ingot produced by distillation.

4 Technical requirements

4.1 Chemical composition The chemical composition of casting magnesium alloy shall comply with the provisions of Table 1. The ones with upper and lower limits in the table are the primary components. When it only has one value, it shall be the upper limit allowed for non-primary components. NOTE 1. Allow to shorten the tip size of the specimen. NTOE 2. From size A to size D, it gradually becomes smaller. Part D shall be in smooth transition. Figure 1 -- Shae and size of san single casting specimen

4.2.4 Sand single casting specimen shall be completely covered by the same sand type for casting. Do not allow any form of additional chilling. In order to ensure the quality of single casting specimen, refer to Annex B for the casting form and the pouring riser system diagram of the recommended sand single casting specimen.

6 Inspection rules

6.1 Batching The same smelting furnace and the same heat treatment state are as one inspection batch. The same smelting furnace but without heat treatment are also used as an inspection batch.