GB/T 13820-2018 English PDF (GBT13820-2018)

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GB/T 13820-2018: Magnesium alloy castings
GB/T 13820-2018
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.150.20
J 31
Replacing GB/T 13820-1992
Magnesium Alloy Castings
ISSUED ON. JULY 13, 2018
IMPLEMENTED ON. AUGUST 1, 2018
Issued by. State Administration for Market Regulation;
Standardization Administration Committee of the People’s
Republic of China.
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative References ... 5 
3 Casting Classification ... 7 
4 Technical Requirements ... 8 
5 Test Methods ... 15 
6 Inspection Rules ... 16 
7 Marking, Packaging, Transportation and Storage ... 19 
Appendix A (Informative) X-radiographic Inspection of Internal Defects of
Magnesium Alloy Castings ... 20 
Foreword
This Standard is drafted in accordance with stipulations in GB/T 1.1-2009.
This Standard serves as a replacement of GB/T 13820-1992 Magnesium Alloy
Castings. In comparison with GB/T 13820-1992, there are several main technical
changes as follows.
---The location of taking test pieces from castings is modified (please refer to
6.3.2.1; 6.3.1 in Version 1992);
---The requirements of mechanical properties of partial alloy body or attached
casting sample are added (please refer to 4.3.1);
---The requirements of inclusion test of casting flux are added (please refer to
4.5.3);
---It is also added that segregation inhomogeneity that exists in the form of lines,
streamlines and dots is allowed on the surface of magnesium alloy castings
that contain zirconium (please refer to 4.5.8);
---The test methods of chemical composition of castings are modified (please refer
to 5.1; 5.1 in Version 1992);
---The stipulations of batch are modified (please refer to 6.1; 6.1 in Version 1992);
---The test items of various castings are added (please refer to 6.2);
---Determination and re-inspection are added (please refer to 6.4);
---The requirements of re-sampling for analysis when alloys are unqualified in
chemical composition are modified (please refer to 5.1.2; 6.2.4 in Version 1992);
---Routine inspection is deleted (please refer to 6.8 in Version 1992).
This Standard was proposed by China Machinery Industry Federation.
This Standard shall be under the jurisdiction of National Technical Committee (54) on
Casting of Standardization Administration of China (SAC/TC 54).
The responsible drafting organization of this Standard. Shenyang Research Institute
of Foundry Co., Ltd.
The participating drafting organizations of this Standard. Shanghai Meridian
Magnesium Alloy Casting Co., Ltd., Shanghai Spaceflight Precision Machinery Institute,
CITIC Dicastal Co., Ltd., Shanghai Jiao Tong University, Dongguan EONTEC Co., Ltd.,
Shanxi REGAL Metal New Materials Co., Ltd.
Magnesium Alloy Castings
1 Scope
This Standard specifies the classification, technical requirements, test methods,
inspection rules, marking, packaging, transportation and storage of magnesium alloy
castings (hereinafter referred to as “castings”).
This Standard is applicable to magnesium alloy castings that are manufactured with
sand casting and metal casting.
2 Normative References
The following documents are indispensable to the application of this Standard. In terms
of references with a specified date, only versions with a specified date are applicable
to this Standard. The latest version (including all the modifications) of references
without a specified date is also applicable to this Standard.
GB/T 228.1 Metallic Materials - Tensile Testing - Part 1. Method of Test at Room
Temperature
GB/T 1177-2018 Casting Magnesium Alloys
GB/T 6414 Castings - Dimensional Tolerances and Geometrical Tolerances and
Machining Allowances
GB/T 11351 Mass Tolerances of Casting
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 Alloys
- Part 7. Determination of Zirconium Content
GB/T 13748.8 Chemical Analysis Methods of Magnesium and Magnesium Alloys
- Part 8. Determination of Rare Earth Content - Gravimetric Method
GB/T 13748.9 Chemical Analysis Methods of Magnesium and Magnesium Alloys
- Part 9. Determination of Iron Content - O-phenanthroline Spectrophotometric
Method
GB/T 13748.10 Chemical Analysis Methods of Magnesium and Magnesium Alloys
- Part 9. Determination of Silicon Content - Molybdenum Blue Spectrophotometric
Method
GB/T 13748.11 Chemical Analysis Methods of Magnesium and Magnesium Alloys
- Determination of Beryllium Content - Solochrome Cyanine R Spectrophotometric
Method
GB/T 13748.12 Chemical Analysis Methods of Magnesium and Magnesium Alloys
- Part 12. Determination of Copper Content
GB/T 13748.14 Chemical Analysis Methods of Magnesium and Magnesium Alloys
- Part 14. Determination of Nickel Content - Dimethylglyoxime Trophotometric
Method
GB/T 13748.15 Chemical Analysis Methods of Magnesium and Magnesium Alloys
- Part 15. Determination of Zinc Content
GB/T 13748.20 Chemical Analysis Methods of Magnesium and Magnesium Alloys
- Part 20. Determination of Elements by Inductively Coupled Plasma Atomic
Emission Spectrometry
GB/T 13748.21 Chemical Analysis Methods of Magnesium and Magnesium Alloys
- Part 21. Determination of Elements by Photoelectric Direct Reading Atomic
Emission Spectrometry
GB/T 13748.22 Chemical Analysis Methods of Magnesium and Magnesium Alloys
- Part 21. Determination of Thorium Content
GB/T 15056 Casting Surface Roughness - Appraising Method
GB/T 19943 Non-destructive Test - Radiographic Examination of Metallic Materials
by X-and Gamma-rays-Basic Rules
GB/T 32792 Packaging, Marking, Transportation and Storage of Magnesium Alloy
Processing Products
HB/Z 60 X-radiographic Inspection
HB/Z 61 Penetrant Inspection
HB/Z 328 Repair Welding Process of Magnesium Alloy Castings and Inspection
HB 5462 Heat Treatment of Magnesium Alloy Casting
2018 as a reference. This content shall be negotiated and determined by the demand
side and the supply side.
4.4 Geometrical Shape, Dimension and Weight Tolerance
4.4.1 The geometrical shape and dimension of castings shall comply with the
requirement of drawings; the dimensional tolerance of castings shall comply with the
stipulation in GB/T 6414. When there are special requirements, they shall be indicated
on the drawings.
4.4.2 When the demand side has requirements towards the weight of castings, the
demand side shall negotiate and determine with the supply side.
4.5 Appearance Quality
4.5.1 Castings shall be cleaned up; there shall be no trimming or burr, sprue and riser
head on the non-processing surface shall be cleaned up and maintain on the same
level as the casting surface. Generally speaking, residue on the sprue and riser head
on the surface to be processed shall not be 5 mm higher than the casting surface or
affect X-radiographic inspection. Under special circumstances, this shall be negotiated
and determined by the demand side and the supply side.
4.5.2 On the surface of castings, cold partition, crack, shrinkage cavity and penetrating
defects, ...