GB/T 5155-2022Magnesium and magnesium alloy extruded rods (English PDF)

6.5 Appearance quality

6.5.1 The surface of the rod shall be clean. There shall be neither cracks, scars, corrosion spots, that cannot be removed by inspection and grinding, nor various pressed objects and concentrated bright circles reflecting the internal cracks of the rod. For the defects, such as cracks, scars, corrosion spots, that can be removed by grinding, they shall be polished and trimmed before oxidation and coloring; however, the depth of trimming shall not be greater than the maximum allowable deviation of the rod diameter; sandpaper should be used for polishing after trimming. Cracks shall not be ground.

6.5.2 The surface of the rod shall not have defects, such as crushing, bumping, cratering, air bubbles, blisters, abrasions, scratches, that affect the user's use; the depth of the defects shall not exceed the allowable negative deviation of the diameter. For rods, which have a diameter of less than 160 mm, the depth of the extrusion marks shall not exceed

0.1 mm; for rods, which have a diameter of not less than 160 mm, the depth of the extrusion marks shall not exceed

0.3 mm.

6.5.3 The surface of the rod should be oxidized; its oxide layer shall be intact, without exposing the base metal or falling off. If the oxidation treatment is not carried out, other anti-corrosion protection measures for the rod shall be determined, through negotiation between the supplier and the buyer; meanwhile it shall be specified in the purchase order (or contract).

7.1 Chemical composition

7.1.1 For the chemical composition analysis and arbitration of other alloy rods, except for LA93Z, LZ91N, LA93M, it shall be carried out according to the methods, which are specified in GB/T 13748 (all parts).

7.1.2 For the chemical composition analysis and arbitration of LA93Z, LZ91N, LA93M alloy rods, except for Li element, it shall be carried out according to the method, which

7.3 Mechanical properties The mechanical property test of the rod is inspected, according to the method specified in GB/T 16865.

7.4 Macrostructure The macrostructure inspection of the rod is carried out, according to the method specified in GB/T 4297.

7.5 Appearance quality The appearance quality of the rods is visually inspected. When the depth of the defect cannot be determined, the grinding method can be used for measurement.

8.1 Inspection and acceptance

8.1.1 The rod shall be inspected by the supplier, to ensure that the product quality conforms to the provisions of this document and the purchase order (or contract); meanwhile it shall fill the quality certificate.

8.1.2 The purchaser shall inspect the received products, according to the provisions of this document. If the inspection results are inconsistent with the provisions of this document and the purchase order (or contract), it shall be submitted to the supplier in writing, to be resolved through negotiation between the supplier and the buyer. For the objection, which belongs to the appearance quality and size deviation, it shall be raised, within one month from the date of receipt of the product. For the objection, which belongs to other properties, it shall be raised, within three months from the date of receipt of the product. If arbitration is required, both the supplier and the buyer shall jointly conduct arbitration sampling on the buyer side.

8.2 Group-batching Rods shall be submitted for acceptance in batches. Each batch shall consist of the same alloy designation, state, specification. The batch weight is not limited.

8.3 Inspection items Each batch of rods shall be subject to exit-factory inspection. The inspection items shall include inspection of chemical composition, dimensional deviation, tensile mechanical properties at room temperature, macrostructure, appearance quality.

8.4 Sampling Sampling of rods shall comply with the provisions of Table 9. the above defects occur; it shall be judged one by one.

8.5.5 When the appearance quality of any rod is unqualified, the rod is judged to be unqualified.

9.1 Marking

9.1.1 The following imprints (or signs with the following imprints) shall be printed, on the front end of the accepted rods.

a) Inspection seal by the quality inspection department of the supplier;

b) Alloy designation;

c) Delivery state;

d) Batch number.

9.1.2 For the rod, which has a diameter of not less than 40 mm, it shall be printed on the front end. For the rod, which has a diameter of less than 40 mm, it shall hang two labels at the front end of the rod, per batch (or per box).

9.1.3 For rods, which have a diameter of not less than 20 mm AND have passed the acceptance inspection, the extruded end shall be marked with the letter "W".

9.1.4 The packaging box marking of rods shall be implemented, in accordance with the provisions of GB/T 32792.

9.2 Packaging, transport, storage

9.2.1 Rods should be greased and packaged. If there are special requirements, they shall be determined, through negotiation between the supplier and the buyer; meanwhile it shall be indicated in the purchase order (or contract).

9.2.2 Other requirements for the packaging, transportation, storage of bars shall be implemented, in accordance with the provisions of GB/T 32792.

9.3 Quality certificate Each batch of bars shall be accompanied by a product quality certificate, which states:

a) The supplier name;

b) The product name;

c) The designation;

f) Product batch number;

g) Net weight and number of pieces;

h) The results of each analytical inspection;

i) Inspection seal by the quality inspection department of the supplier;

j) The document number;

k) Packaging date (or exit-factory date).