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GB/T 38715-2020 English PDF (GBT38715-2020)

GB/T 38715-2020 English PDF (GBT38715-2020)

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GB/T 38715-2020: High strength magnesium alloy bars

This Standard specifies the requirements, test methods, inspection rules and marking, packaging, transportation, storage, quality certificates and order forms (or contracts) of high strength magnesium alloy bars. This Standard is applicable to deformed magnesium alloy round bars, square bars and hexagonal bars (hereinafter referred to as bars) with room temperature tensile strength of no less than 350 MPa obtained by extrusion process.
GB/T 38715-2020
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 77.150.20
H 61
High Strength Magnesium Alloy Bars
ISSUED ON: MARCH 31, 2020
IMPLEMENTED ON: FEBRUARY 01, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Requirements ... 5
4 Test Methods ... 10
5 Inspection Rules ... 10
6 Marking, Packaging, Transportation, Storage and Quality Certificates ... 12 7 Contents of Order Form (or Contract) ... 14
High Strength Magnesium Alloy Bars
1 Scope
This Standard specifies the requirements, test methods, inspection rules and marking, packaging, transportation, storage, quality certificates and order forms (or contracts) of high strength magnesium alloy bars.
This Standard is applicable to deformed magnesium alloy round bars, square bars and hexagonal bars (hereinafter referred to as bars) with room temperature tensile strength of no less than 350 MPa obtained by extrusion process.
2 Normative References
The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this document.
GB/T 4297 Inspection Method for Macrostructure of Wrought Magnesium Alloy Products
GB/T 5153 Designation and Composition of Wrought Magnesium and Magnesium Alloys
GB/T 5155-2013 Magnesium Alloy Extruded Bars
GB/T 6519-2013 Ultrasonic Inspection of Wrought Aluminum and Magnesium
Alloy Products
GB/T 13748 (all parts) Chemical Analysis Methods of Magnesium and Magnesium Alloys
GB/T 16865 Test Pieces and Method for Tensile Test for Wrought Aluminum and Magnesium Alloys Products
GB/T 17432 Methods for Sampling for Analyzing the Chemical Composition of Wrought Aluminum and Aluminum Alloys
GB/T 20967 Non-Destructive Testing-Visual Testing-General Principles
The round bar with designation of AQ80M, status of H112, diameter of 40mm, and length of 3500mm shall be labelled as follows:
Round bar GB/T 38715-AQ80M H112- ??40??3500
Example 2:
The non-scaled hexagonal bar with designation of VW75M, status of T5, inscribed circle diameter of 120mm, accuracy of Level-A shall be labelled as follows:
Hexagonal bar GB/T 38715-VW75M T5-120-A
3.2 Quality assurance
3.2.1 Guarantee of raw materials
The ingots used for the production of high-strength magnesium alloys shall meet the requirements of the bar composition and macrostructure specified in this Standard; and the other quality requirements of the ingots shall conform to the provisions of YS/T 627.
3.2.2 Guarantee of production process
The supplier shall adopt production equipment and extrusion technology to effectively ensure the quality of the bar; and the extrusion ratio shall be no less than 6. 3.3 Chemical composition
The chemical composition for the designations of VW93M, VW94M, VW84N, WN54M and VW92 shall conform to the provisions of Table 2; and the chemical composition of other designations shall conform to the provisions of GB/T 5153.
3.8.2 The surface of the bar is allowed to have defects such as squeeze marks, pressure injuries, damages, bubbles, scrapes, scratches, bumps, depressions, etc. with the depth not exceeding the negative deviation.
4 Test Methods
4.1 Chemical composition
The chemical composition analysis method of the bar shall be carried out according to the provisions of GB/T13748 or YS/T1036; and arbitration analysis shall adopt GB/T 13748.
4.2 Dimension deviation
Dimension deviation is measured by measuring tools with correspondingly accuracy. 4.3 Tensile mechanical properties at room temperature
The test method of the longitudinal mechanical properties of the bar at room temperature shall be carried out according to the method specified in GB/T 16865. 4.4 Macrostructure
The test method for the macrostructure of the bar shall be carried out according to the method specified in GB/T 4297.
4.5 Ultrasonic flaw detection
The ultrasonic testing method of the bar shall be carried out according to the method specified in GB/T 6519-2013.
4.6 Appearance quality
The test method for the appearance quality of the bar shall be carried out according to the method specified in GB/T 20967.
5 Inspection Rules
5.1 Inspection and acceptance
5.1.1 The bar shall be inspected by the supplier to ensure that the product quality meets the requirements of this Standard and the purchase order (or contract), and fill in the quality certificate.
determined to be unqualified.
5.5.2 If the dimension deviation is unqualified, such piece of bar is determined to be unqualified.
5.5.3 When the mechanical property of any sample is unqualified, a double number of samples shall be taken from the batch of bars for repeated inspection. If all the repeated inspection results are qualified, such batch of products shall be determined to be qualified. If there are still unqualified samples in the repeated inspection results, such batch of products shall be determined to be unqualified.
5.5.4 When the macrostructure of any sample is unqualified, it shall be determined as follows:
a) If it is unqualified due to the cracks, oxide film, metal compound and manganese compound segregation, such batch shall be rejected.
b) If it is unqualified due to tail shrinkage, coarse crystal ring, bright ring and stratification, it is allowed to cut a certain length of the unqualified bar and repeat the inspection until it is qualified. The remaining bars may be inspected one by one; only the qualified shall be delivered; or they may be delivered according to the re-inspection to the maximum tail-cutting length of qualified bars. When other defects occur, such batch of bars shall be dealt with through consultation between the supplier and the purchaser.
5.5.5 When the ultrasonic flaw detection is unqualified, such piece of bar is determined to be unqualified.
5.5.6 When the appearance quality is unqualified, such piece of bar is determined to be unqualified.
6 Marking, Packaging, Transportation, Storage and
Quality Certificates
6.1 Marking
6.1.1 Product marking
6.1.1.1 The following marks (or signs with the following marks) shall be stamped on the front end of the bar that has passed the acceptance test:
a) The marks of the supplier's technical supervision department;
b) Trademark;

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