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GB/T 13820-2018Magnesium alloy castings (English PDF)

镁合金铸件

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

July 13, 2018

Implementation date

August 1, 2018

Scope

GB/T 13820-2018 is the English-translated version of 镁合金铸件.

GB/T 13820-2018 covers magnesium alloy castings produced by sand casting and metal casting. It specifies their classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage.

The requirements run from chemical composition and the mechanical properties of separately cast and attached samples to geometrical shape, dimensional and weight tolerances, appearance quality - cleaning of sprues and risers, cold shuts, cracks, shrinkage cavities, flux inclusions and surface holes - and internal quality checked by X-radiography.

The inspection rules fix the batch, the test items for each casting category and the re-testing allowed when composition, mechanical properties or internal quality fail.

It cites GB/T 228.1, GB/T 1177-2018, GB/T 6414, GB/T 11351, GB/T 15056, GB/T 19943 and GB/T 32792. It replaces GB/T 13820-1992, was issued on 13 July 2018 and has applied since 1 August 2018.

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Document preview — GB/T 13820-2018

National Standard of the People's Republic of China

ICS: 77.150.20
Classification: J 31
Replacing: GB/T 13820-1992

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Foreword3
1 Scope5
2 Normative References5
3 Casting Classification7
4 Technical Requirements8
5 Test Methods15
6 Inspection Rules16
7 Marking, Packaging, Transportation and Storage19
Appendix A (Informative) X-radiographic Inspection of Internal Defects of Magnesium Alloy Castings20

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).

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

4 Technical Requirements

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.

5 Test Methods

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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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 24 pages — is available in the English PDF.

Referenced standards

Normative references

HB/Z 60 · HB/Z 61 · HB/Z 328 · HB 5462

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