GB/T 19078-2016Magnesium alloys ingots for castings (English PDF)

3.1 Alloy designations of ingots

3.1.1 The alloy designation is expressed in the form of two English letters, two numbers and one English letter. Examples are as follows.

3.1.4 The last English letter of the alloy designation is the identification code, which is used to identify different alloy ingots with different specific compositions or slight differences in element content.

3.2 Chemical composition

3.2.1 The chemical composition of magnesium alloy ingots for castings shall comply with the provisions of Table 2. The limit values are expressed as follows.

3.2.2 If the buyer requests to adjust the limit values of elements specified in Table 2, or has requirements for other impurity elements not specified in the table, it can be negotiated with the supplier separately.

4.1 Chemical composition analysis method

The arbitration analysis method of the chemical composition of ingots shall be carried out according to the provisions of GB/T 13748.

4.2 Appearance quality inspection method

The surface quality of ingots is checked visually.

5.1 Inspection and acceptance

5.1.1 The ingots shall be inspected by the technical supervision department of the supplier to ensure that the product quality complies with the provisions of this Standard (or order contract), and a quality certificate shall be filled out.

5.2 Batching

The ingots shall be submitted for acceptance in batches. Each batch shall consist of alloy ingots of the same designation and the same melting furnace.

5.3 Inspection items

Each batch of ingots shall be inspected for chemical composition, appearance quality, and inspection items (microstructure, mechanical properties, salt spray corrosion performance) required by the contract. If necessary, it is provided to the buyer for dreference, with a retrospective period of 1 year.

5.4 Sampling and sample preparation

5.4.1 Sampling and sample preparation of test pieces for chemical composition analysis

5.4.3 Sampling of microstructure, mechanical properties and salt spray corrosion performance

The sampling of microstructure, mechanical properties and salt spray corrosion performance of ingots shall be determined through negotiation between the supplier and the buyer.

5.5 Determination of inspection results

5.5.1 When the arbitration analysis results of the chemical composition do not comply with the provisions of this Standard, the batch shall be determined to be unqualified.

5.5.2 When the appearance quality does not comply with the provisions of this Standard, the batch is determined to be unqualified. But it is allowed to inspect one by one by the supplier, and the qualified ones will be delivered.

5.5.3 When the microstructure, mechanical properties and salt spray corrosion performance are unqualified, take double the quantity of test pieces to repeat the inspection.

6.1 Marking

6.1.1 The surface of each ingot shall be clearly marked with the alloy designation, melting furnace number and trademark.

6.1.2 The packaging shall be marked with.

6.2 Packaging, transportation and storage

6.2.1 Unless otherwise required by the buyer, the packaging method of ingots shall be determined by the supplier. The packaging method shall fully consider the capability of the shipping equipment and the anti-damage capability of the packaging during transportation.

6.2.2 The ingots are stacked, stored and transported according to the designation.

6.2.3 The ingots shall be transported by vehicles with rain-proof equipment and clean carriage.

6.3 Quality certificate

Each batch of products shall be accompanied by a quality certificate indicating.