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

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

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GB/T 13820-2018: Magnesium alloy castings

This Standard specifies the classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of magnesium alloy castings. This Standard is applicable to magnesium alloy castings that are manufactured with sand casting and metal casting.
GB/T 13820-2018
GB
NATIONAL STANDARD OF THE
PEOPLE 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
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, and severe defective defects (such as defective casting and mechanical damage, etc.) are not allowed.
4.5.3 The variety and quantity of flux inclusion test that are displayed in constant- humidity cabinet shall be indicated by the demand side on drawings or technical agreements. In terms of castings that need to display flux inclusion test in the constant- humidity cabinet, the quantity and size of flux inclusions on all the surfaces before cleaning shall not exceed what is stipulated in HB 7738.
4.5.4 On the to-be-processed surface of castings, any defects that will not exceed the range of machining allowances through processing are allowed.
4.5.5 Parts that work as processing benchmarks on the castings shall be flat and smooth.
4.5.6 After cleaning, holes that exist on the non-processing surface and processed surface of the castings shall comply with the stipulation in Table 3. Defects on the surface of the castings shall not exceed the following range.
a) After oxidation treatment, scattered and dotted surface holes whose diameter is not more than 1.5 mm and whose depth is not more than 1 mm are allowed on the non-processing surface of the castings; scattered and dotted surface holes whose diameter is not more than 1 mm and whose depth is not more than 0.5 mm are allowed on the processed surface of the castings.
drawings or technical agreements. In terms of castings with easily variable dimensions, they shall be tested one by one. The dimensions that must be tested shall be negotiated and determined by the demand side and the supply side. Dimensions that cannot be tested shall comply with the stipulation on drawings or technical agreements. 5.3.2 When the drawings have requirements towards the weight, weight and weight tolerance shall comply with the stipulation on drawings or technical agreements during acceptance check. If it is not clearly stipulated, the weight tolerance of castings shall comply with the stipulation in GB/T 11351.
5.4 Appearance Quality
5.4.1 Appearance quality can be tested through visual inspection, or with certain tools, instruments or appropriate methods.
5.4.2 When fluorescence detection or Kerosene infiltration inspection is needed on castings, comply with the stipulation in HB/Z 61.
5.4.3 The roughness level of the non-processing surface of castings shall comply with the stipulation in GB/T 15056.
5.5 Internal Quality
The X-radiographic detection of castings shall comply with the stipulation in GB/T 19943 or HB/Z 60.
6 Inspection Rules
6.1 Group Batch
Castings that are poured in the same smelting furnace within 8 h and adopt the same thermal treatment process shall be deemed as one batch. Under special
circumstances, batch shall be negotiated and determined by the demand side and the supply side.
6.2 Test Items
Castings shall be tested in accordance with the category. Please refer to Table 6 for the test items of various castings.
6.4.1 Chemical composition
When castings are submitted for the analysis of chemical composition for the first time and are deemed as unqualified, it is allowable to re-sample for the analysis of unqualified elements. If they still fail in the second analysis, this smelting furnace of castings shall be determined as unqualified in chemical composition.
6.4.2 Mechanical properties
6.4.2.1 When the mechanical properties of 2 test pieces from 3 separated casting samples in each batch can comply with the stipulation in GB/T 1177-2018, this batch of castings are qualified in mechanical properties. When test pieces taken from separate casting samples and castings fail in the first mechanical properties test, it is allowable to re-conduct thermal treatment on the separate casting samples and castings, then, re-take a sample for test. If they still fail in the test, it is allowable to conduct a third thermal treatment. If they are still unqualified in the result, then, this batch of castings shall be deemed as unqualified. After each thermal treatment, if separate casting samples fail in the mechanical properties test, but test pieces taken from the castings are qualified in the mechanical properties test, then this batch of castings shall be deemed as qualified.
6.4.2.2 When the test result is unqualified, which is caused by failure in the test itself, or visible defects (such as slag inclusions and air holes, etc.) on the test pieces for the tensile test, it shall not be included in the number of test. Under this circumstance, replace the test pieces and re-conduct the test.
6.4.3 Internal quality
When castings are unqualified in random X-radiographic inspection, take a double quantity of casting sample. If they are still unqualified, inspect all of the castings one by one.
7 Marking, Packaging, Transportation and Storage
The packaging, marking, transportation and storage of castings shall comply with the stipulation in GB/T 32792.

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