GB/T 13821-2023 English PDF (GBT13821-2023)

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GB/T 13821-2023: Zinc alloy die castings
GB/T 13821-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.120.60
CCS J 31
Replacing GB/T 13821-2009
Zinc alloy die castings
ISSUED ON: MAY 23, 2023
IMPLEMENTED ON: MAY 23, 2023
Issued by: State Administration for Market Regulation;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 7
4 Classification and grading of zinc alloy die castings ... 7
5 Technical requirements ... 7
6 Test methods ... 10
7 Inspection rules ... 11
8 Delivery, marking, packaging, transportation, and storage ... 13
Appendix A (Informative) Zinc alloy designation comparisons and typical
mechanical and physical properties ... 15
Appendix B (Informative) Classification requirements for allowable surface
defects of zinc alloy die castings ... 16
Zinc alloy die castings
1 Scope
This document specifies the classification and grading, technical requirements, test
methods, inspection rules, delivery, marking, packaging, transportation, and storage of
zinc alloy die castings.
This document applies to the manufacturing and quality inspection of zinc alloy die
castings.
2 Normative references
The contents of the following documents, through normative references in this text,
constitute indispensable provisions of this document. Among them, for dated references,
only the edition corresponding to that date applies to this document. For undated
references, the latest edition (including all amendments) applies to this document.
GB/T 228.1 Metallic materials - Tensile testing - Part 1: Method of test at room
temperature
GB/T 231.1 Metallic materials - Brinell hardness test - Part 1: Test method
GB/T 1182 Geometrical product specifications (GPS) - Geometrical tolerancing -
Tolerances of form, orientation, location and run-out
GB/T 1958 Geometrical Product Specifications (GPS) - Geometrical tolerance -
Verification
GB/T 2828.1 Sampling procedures for inspection by attributes - Part 1: Sampling
schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection
GB/T 2829 Sampling procedures and tables for periodic inspection by attributes
(apply to inspection of process stability)
GB/T 3177 Geometrical product specifications (GPS) - Inspection of plain
workpiece sizes
GB/T 5611 Foundry terminology
GB/T 5678 Sampling methods of spectrochemical analysis for cast alloys
GB/T 6414 Castings - Dimensional tolerances and geometrical tolerances and
5.5.1 The surface roughness of zinc alloy die castings shall comply with the drawings
or the requirements of the demand side.
5.5.2 Zinc alloy die castings shall not have cracks, under-casting, and any penetrating
defects.
5.5.3 Zinc alloy die castings are allowed to have defects such as holes, cold shuts,
surface defects, and imperfections. Refer to Appendix B for defect classification
requirements. Other defects in zinc alloy die castings shall comply with the
requirements of the drawings.
5.5.4 If there are no special provisions in the drawings, for the settings related to the die
casting process, such as the position of ejector pin, the position of parting line, and the
position of gate and overflow port; and for the positions that shall be removed by
machining and other methods in the subsequent process AND those that cannot be
removed by machining and other methods; it shall be agreed upon by both the supply
and the demand sides.
5.5.5 The machined surface quality and non-machined surface quality of zinc alloy die
castings shall meet the requirements of the demand side.
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 Test methods
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 Inspection rules
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 Delivery, marking, packaging, transportation, and storage
8.1 Delivery
8.1.1 When required in the contract or agreement, the supply side shall...