GB/T 13821-2023Zinc alloy die castings (English PDF)

5.6 Internal quality

5.6.1 Internal defects such as pores, inclusions, shrinkage cavities, and porosity in zinc alloy die castings shall comply with the requirements of the drawings. If the requirements for use can be met, defects such as pores and shrinkage cavities in the die castings shall not be used as a basis for scrapping.

5.6.2 Under the condition of not affecting the use of die castings, with the consent of the demand side, the supply side can perform infiltration, repair, and deformation correction treatment on zinc alloy die castings.

6.1 Chemical composition

6.1.1 The inspection methods for the chemical composition of zinc alloy die castings shall be in accordance with GB/T 12689.1, GB/T 12689.3, GB/T 12689.4, GB/T 12689.5, GB/T 12689.6, GB/T 12689.7, GB/T 12689.10, GB/T 12689.12, or GB/T 26042.

6.1.2 When there is a dispute over the analysis results, arbitration shall be conducted in accordance with GB/T 12689.1, GB/T 12689.3, GB/T 12689.4, GB/T 12689.5, GB/T 12689.6, GB/T 12689.7, and GB/T 12689.10.

6.2 Mechanical properties

6.2.1 The tensile test of zinc alloy die castings shall be carried out in accordance with the provisions of GB/T 228.1.

6.2.2 The hardness test of zinc alloy die castings shall be carried out in accordance with the provisions of GB/T 231.1.

6.2.3 When zinc alloy die castings require body inspection, the sampling location, specimen size, and test method shall be agreed upon by both the supply and the demand sides.

6.3 Dimensions

6.3.1 The geometrical dimension inspection of zinc alloy die castings shall be carried out in accordance with the provisions of GB/T 3177 and GB/T 34634.

6.3.2 The geometrical tolerance inspection of zinc alloy die castings shall be carried out in accordance with the provisions of GB/T 1958.

6.3.3 It shall use general or special measuring tools that meet the accuracy for inspection.

6.4 Mass The mass inspection of zinc alloy die castings shall be carried out in accordance with the provisions of GB/T 11351.

6.5 Surface quality

6.5.1 The roughness rating of the non-machined surface of zinc alloy die castings shall be carried out in accordance with the provisions of GB/T 15056.

6.5.2 The inspection method for surface roughness of zinc alloy die castings shall be carried out in accordance with the provisions of GB/T 10610.

6.5.3 The surface quality of zinc alloy die castings shall be tested visually or by other appropriate methods.

6.6 Internal quality The internal quality inspection of zinc alloy die castings shall be carried out in accordance with the provisions of GB/T 35388, GB/T 36589, or GB/T 39638.

7.1 Inspection items

7.4.2 During the inspection of mechanical properties, there are 3 specimens for each group. If 2 of the 3 specimens tested fail to meet the mechanical properties, the lot will be determined as nonconformity. It is allowed to double the number of specimens for the second inspection. If 2 specimens fail in the second inspection, but the overall average value is qualified, the lot will be determined as conformity. If there are more than 2 nonconformity specimens, the lot will be determined as nonconformity.

7.4.3 If the dimensions of any product under sampling inspection fail, the lot will be determined as nonconformity.

7.4.4 If the mass of any product under sampling inspection fails, the lot will be determined as nonconformity.

7.4.5 If the surface quality of any product under sampling inspection fails, the lot will be determined as nonconformity.

7.4.6 If the internal quality of any product under sampling inspection fails, the lot will be determined as nonconformity.

8.1 Delivery

8.1.1 When required in the contract or agreement, the supply side shall submit the inspection report to the demand side.

8.1.2 Zinc alloy die castings shall be delivered with an inspection certificate.

8.2 Marking

8.2.1 Product marking Zinc alloy die castings shall at least have the following marks cast or engraved on the non-machined surface:

a) Raw material's designation;

d) Supply side's information, such as trademark or symbol;

e) Date of production.

8.2.2 Packaging marking The outer packaging of zinc alloy die castings shall at least have the following markings:

b) Product code or special traceability information;

c) Packaging quantity;

d) Supply side's information, such as trademark or symbol;

e) Date of production;

f) This document's number;

g) Seal of inspection conformity.

8.3 Packaging The packaging of zinc alloy die castings shall be firm and reliable. During transportation and handling, there shall be no damage or breakage.

8.4 Transportation During transportation, zinc alloy die castings shall comply with stacking requirements. It is strictly prohibited to be exposed to rain, moisture, throwing, and violent collision.