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GB/T5155—2003
This standard is a revision of GB/T5155—1985 "Hot Extruded Magnesium Alloy Rods". This standard is prepared with reference to the American ASTMB107-2002 "Magnesium Alloy Extruded Rods, Profiles, Tubes and Wires" and other standards. Compared with GB/T5155-1985, this standard has the following changes: New grades and state codes are adopted.
- The D-level dimensional deviation in the original standard is deleted. High-precision and ultra-high-precision grades for bar bending are added. - The mechanical properties are in the International System of Units. This standard replaces GB/T5155-1985 from the date of implementation. Appendix A and Appendix B of this standard are informative appendices. This standard is proposed by the China Nonferrous Metals Industry Association. This standard is under the jurisdiction of the National Technical Committee for Standardization of Nonferrous Metals. The drafting unit of this standard: Northeast Light Alloy Co., Ltd. The main drafters of this standard are Qin Liyan, Wang Guojun, Liu Weizhou, Wang Yugang, Wu Xinfeng and Hou Xianzhi. This standard is interpreted by the National Technical Committee for Standardization of Nonferrous Metals. The previous versions of the standards replaced by this standard are: -GB/T5155-1985.
1 Scope
Magnesium alloy hot extruded bars
GB/T5155-2003
This standard specifies the requirements, test methods, inspection rules and marking, packaging, transportation, storage and contract content of magnesium alloy bars. This standard applies to magnesium alloy hot extruded bars with oxidized surface. 2 Normative references
The clauses in the following documents become the clauses of this standard through reference in this standard. For any dated referenced document, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, the parties to the agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For any undated referenced document, the latest version shall apply to this standard. GB/T228 Room temperature tensile test method for metallic materials GB/T3199 Packaging, marking, transportation and storage of aluminium and aluminium alloy processed products GB/T4297 Macrostructure inspection method for magnesium alloy processed products GB/T5153 Brands and chemical compositions of wrought magnesium and magnesium alloys SH0039 Industrial vaseline
GB/T13748 (all parts) Chemical analysis methods for magnesium and magnesium alloys GB/T16865 Specimens for tensile test of wrought aluminium, magnesium and their alloy products GB/T17432 Sampling method for chemical composition analysis of wrought aluminium and aluminium alloys SY1502 Grease for guns
3 Requirements
3.1 Product classification
3.1.1 Brand and state
The brand and state of the bar shall comply with the provisions of Table 1. Table 1 Brand, state
AZ40M.ME20M
Note: The comparison tables of new and old brands and new and old states are shown in Appendix A and Appendix B respectively. 3.1.2 Marking examples
Example 1:
H112, F
T5, F
Grade B round bars made of ME20M, in hot extrusion state, with a diameter of 70.00mm and a fixed length of 4000mm, are marked as: Rod ME20M-H112Grade B$70X4000GB/T5155—2003Example 2:
Grade C non-fixed-length round bars made of ZK61M, in hot extrusion and artificial aging state, with a diameter of 120.00mm, are marked as: Rod ZK61M-T5$120GB/T5155—20033.2 Chemical composition
The chemical composition of the bar shall comply with the provisions of GB/T5153. 3.3 Allowable size deviation
GB/T5155—2003
Allowable diameter deviation of bars
The allowable diameter deviation of bars shall comply with the provisions of Table 2. Table 2 Rod diameter and its allowable deviation
5.00～6.00
>6. 00～10. 00
>10. 00~18. 00
>18. 00 ~ 30. 00
>30. 00~~50. 00
>50. 00 ~80. 00
>80. 00 ~120. 00
>120, 00~180. 00
>180. 00 ~250. 00
>250. 00 ~~ 300. 00
Diameter allowable deviation
Note: When the outer diameter requires (soil) deviation, the deviation value is half of the absolute value of the corresponding value in this table. 3.3.2 Curvature of bars
Unit is millimeter
For bars with a diameter not exceeding 10.00mm, curvature that can be eliminated by light pressure by hand is allowed. The curvature of bars of other specifications shall comply with the provisions of Table 3.
Bar curvature
Curvature not greater than
>10. 00 ~ 100. 00
>100. 00~120.00
>120. 00 ~ 130. 00
Ordinary grade
Per meter length
Total length L/m
High precision grade
Per meter length
Total length L/m
Note: The curvature of bars less than 1m is calculated as 1m. The curvature of bars with a diameter greater than 130.00mm is not checked. 3. 3. 3 Out-of-roundness
The out-of-roundness of bars should not exceed the allowable deviation of the diameter. 3.3.4 The length tolerance of fixed-length or multiple-length bars is in millimeters
Ultra-high precision
Per meter
Total length L/m
For fixed-length or multiple-length bars, the fixed-length length is negotiated by the supply and demand parties, and the length tolerance is +20mm. For multiple-length bars, a 5mm sawing allowance should be left for each sawing cut. If there are special requirements for sawing allowance, please indicate it in the contract. If the contract does not indicate fixed-length, it will be delivered according to random length. When the diameter is equal to or less than 50.00mm, the delivery length is 1000mm~6000mm, and when the diameter is greater than 50.00mm, the delivery length is 500mm~6000mm.
3.3.5 Accuracy level
The accuracy level of bars should be indicated in the contract. If it is not indicated in the order contract, the bars will be supplied at the lowest level. 2
3.3.6 Cutting slope
Both ends of the bar should be cut evenly without burrs, and the cutting slope should not exceed 3°. 3.4 Mechanical properties
The room temperature longitudinal mechanical properties of the bar should comply with the requirements of Table 4. Table 4 Longitudinal mechanical properties of bars at room temperature
Tensile strength Rm/
Bar diameter/
≤100.00
>100. 00 ~ 130. 00
>50. 00~100. 00
>100.00~130.00
≤100.00
>100.00～130.00
(N/mm2)
Note: For bars with a diameter equal to or greater than 130.00mm, the mechanical properties are attached with test results or agreed upon by both parties. 3.5 Macrostructure
GB/T5155—2003
Specifies that the non-proportional elongation
strength Rpo.2 /
(N/mm2)
is not less than
elongation after fracture As /
3.5.1The macrostructure test piece of the bar shall not have defects such as cracks, cracks, pores, shrinkage tails and inclusions that destroy the continuity of the metal. 3.5.2The macrostructure test piece of the bar is allowed to have stratification with a depth not exceeding half of the diameter deviation margin. If the requirement is for a bar without stratification, it should be indicated in the contract.
3.5.3The depth of the coarse grain ring on the macrostructure test piece of ZK61M alloy bar shall not exceed 5mm. 3.6 Surface quality
3.6.1 The surface of the bar should be clean. There should be no cracks, scars, corrosion spots, various indentations and concentrated bright circles reflecting cracks inside the bar that cannot be removed by inspection and grinding. These defects are allowed to be polished and trimmed before oxidation and coloring, but the depth should not be greater than the allowable negative deviation of the bar diameter. After trimming, use sandpaper to polish. Cracks are not allowed to be polished. 3.6.2 The surface of the bar is not allowed to have defects such as bruises, bumps, pits, bubbles, pores, abrasions and scratches that affect user use. The depth of the defect shall not exceed the allowable negative deviation of the diameter. For bars with a diameter less than 160.00mm, the depth of the extrusion mark shall not exceed 0.1mm. For bars with a diameter greater than or equal to 160.00mm, the depth of the extrusion mark shall not exceed 0.3mm. 3.6.3 The surface of the bar should be oxidized. The oxide layer should be intact, without exposing the base metal and without falling off. 4 Test methods
4.1 Chemical composition arbitration analysis method
The chemical composition arbitration analysis of the bar shall be in accordance with GB/T13748, and the sampling shall refer to GB/T17432. 4.2 Dimension measurement method
The diameter of the bar shall be measured with a measuring tool with an accuracy of not less than 0.02mm, and the length shall be measured with a ruler. 4.3 Room temperature longitudinal mechanical property test method
The room temperature longitudinal mechanical property test of the bar shall be carried out in accordance with the provisions of GB/T228, and the sampling shall be carried out in accordance with the provisions of GB/T16865. 4.4 Macrostructure test method
The macrostructure test of the bar shall be carried out in accordance with the provisions of GB/T4297. 4.5 Surface quality test method
GB/T5155—2003
The surface quality of the bar shall be visually inspected. When the depth of the defect cannot be determined, the grinding method can be used for measurement. 5 Inspection rules
5.1 Inspection and acceptance
5.1.1 The bar material shall be inspected by the supplier's technical supervision department to ensure that the product quality complies with the provisions of this standard (or order contract), and the quality certificate shall be filled in.
5.1.2 The purchaser shall unpack and inspect the product within 5 days after receiving the product, and re-inspect it in accordance with the provisions of this standard. If the re-inspection result does not comply with the provisions of this standard (or order contract), it shall be submitted to the supplier in written form and resolved by negotiation between the supplier and the purchaser. Objections to surface quality and dimensional deviation shall be raised within 1 month from the date of receipt of the product, and other objections shall be raised within 3 months from the date of receipt of the product. If arbitration is required, arbitration sampling shall be conducted jointly by the supplier and the purchaser.
5.2 Batching
Bar materials shall be submitted for acceptance in batches, and each batch shall consist of bars of the same melting time, state, specification and accuracy level. 5.3 Inspection Items
Each batch of bars shall be inspected for chemical composition, mechanical properties, dimensional deviation, surface quality and macrostructure before leaving the factory. Bars with a diameter less than or equal to 20.00 mm shall not be inspected for macrostructure. 5.4 Sampling
Sampling of bars shall comply with the provisions of Table 5.
Table 5 Sampling regulations
Test items
Chemical composition
Dimensional deviation
Surface quality
Room temperature mechanics
Macrostructure
Sampling position
GB/T 17432
Any position
Extrusion front end
Extrusion tail end
5.5 Determination of test results
Sampling quantity
Refer to GB/T17432
Inspection of each root
10% of the number of roots shall be taken for each batch (furnace), not less than 2 roots, and one sample shall be taken for each root. If there are non-proportional elongation strength requirements, only 50% of the number of samples shall be measured, but not less than 2
10% of the number of roots shall be taken for each batch, not less than 2 roots. Requirement of taking one sample from each bar
Chapter number
Test method
Chapter number
5.5.1 When the chemical composition is unqualified, the melting (or batch) is judged to be unqualified. When the size and surface quality are unqualified, it is considered a single piece unqualified. 5.5.2 If any one of the mechanical properties is unqualified, double the number of samples (including the unqualified ones themselves) must be taken from the batch (furnace) for re-inspection. If the re-inspection result is unqualified, the batch will be scrapped, or the supplier will check each bar one by one, and the qualified ones will be delivered. 5.5.3 For bars that are unqualified due to tail shrinkage, coarse grain rings, and stratification in the macrostructure, it is allowed to cut off a certain length of the unqualified bars and re-inspect until they are qualified. The remaining bars are either inspected one by one and delivered if they are qualified, or they are cut off according to the maximum tail length of the bars that have been re-inspected to be qualified and then delivered. When other defects occur, the batch of bars will be handled by negotiation between the supply and demand parties. 6 Marking, packaging, transportation, storage
6.1 Marking
The marking of the packaging box of bars shall refer to the relevant provisions of G3/T3199. The front end of the qualified products shall be stamped (or a metal plate with a corresponding stamp shall be hung). The front end of the qualified bars with a diameter greater than 35.00 mm shall be stamped with the following a), b), c), d); the front end of the qualified bars with a diameter of 21.00 mm to 35.00 mm shall be stamped with the following b), c); the front end of each box of bars shall be hung with two small plates with the following a), b), c), d); for the qualified bars with a diameter less than or equal to 20.00 mm, the following a), b), c), d) shall be stamped on the small metal plate. The extruded tail end of the qualified bars with a diameter greater than 20.00 mm shall also be stamped with the word "W".
Stamp of the supplier's technical supervision department;
b) Alloy grade;
c) Supply status;
d) Batch number.
6.2 Packaging, transportation and storage
6.2.1 After oxidation treatment, the bars are coated with dehydrated (foam removed) gun oil preheated to above 100℃. The gun oil should comply with the provisions of SY1502 (neutral or weakly alkaline vaseline containing 6% refined wax is allowed to replace gun oil. Vaseline should comply with the provisions of SH0039.). 6.2.2 For other requirements for packaging, transportation and storage, refer to the relevant provisions of GB/T3199. 6.3 Quality Certificate
Each batch of bars shall be accompanied by a quality certificate that complies with the requirements of this standard, which shall indicate: supplier’s name, address, telephone number and fax number; a)
b) product name;
c) alloy grade;
d) specification;
e) supply status;
f) batch number;
g) net weight or number of pieces;
h) various analysis and test results and stamp of the technical supervision department; i) this standard number;
j) date of manufacture.
Contract content
The contract for ordering products listed in this standard should include the following contents: a) product name;
b) alloy grade;
c) material state;
d) size specifications;
e) weight;
f) matters that should be specified in the contract as required by this standard; g) number of this standard;
h) negotiation results when adding contents beyond this standard. GB/T 5155-2003
New grade
Appendix A
(Informative Appendix)
Comparison table of new and old grades
Old grade
New status
Appendix B
(Informative Appendix)
Comparison table of new and old status
Old status
GB/T 5155—20034 Sampling
The sampling of bars shall comply with the provisions of Table 5.
Table 5 Sampling Provisions
Inspection Items
Chemical Composition
Dimension Deviation
Surface Quality
Room Temperature Mechanics
Macrostructure
Sampling Location
GB/T 17432
Any Location
Extrusion Front End
Extrusion Tail End
5.5 Determination of Inspection Result
Sampling Quantity
Refer to GB/T17432
Inspection of Each Root
10% of the number of roots shall be taken for each batch (furnace), not less than 2 roots, and one specimen shall be taken for each root. If there are provisions for non-proportional elongation strength requirements, only 50% of the number of specimens shall be measured, but not less than 2
10% of the number of roots shall be taken for each batch, not less than 2 roots. Requirement of taking one sample from each bar
Chapter number
Test method
Chapter number
5.5.1 When the chemical composition is unqualified, the melting (or batch) is judged to be unqualified. When the size and surface quality are unqualified, it is considered a single piece unqualified. 5.5.2 If any one of the mechanical properties is unqualified, double the number of samples (including the unqualified ones themselves) must be taken from the batch (furnace) for re-inspection. If the re-inspection result is unqualified, the batch will be scrapped, or the supplier will check each bar one by one, and the qualified ones will be delivered. 5.5.3 For bars that are unqualified due to tail shrinkage, coarse grain rings, and stratification in the macrostructure, it is allowed to cut off a certain length of the unqualified bars and re-inspect until they are qualified. The remaining bars are either inspected one by one and delivered if they are qualified, or they are cut off according to the maximum tail length of the bars that have been re-inspected to be qualified and then delivered. When other defects occur, the batch of bars will be handled by negotiation between the supply and demand parties. 6 Marking, packaging, transportation, storage
6.1 Marking
The marking of the packaging box of bars shall refer to the relevant provisions of G3/T3199. The front end of the qualified products shall be stamped (or a metal plate with a corresponding stamp shall be hung). The front end of the qualified bars with a diameter greater than 35.00 mm shall be stamped with the following a), b), c), d); the front end of the qualified bars with a diameter of 21.00 mm to 35.00 mm shall be stamped with the following b), c); the front end of each box of bars shall be hung with two small plates with the following a), b), c), d); for the qualified bars with a diameter less than or equal to 20.00 mm, the following a), b), c), d) shall be stamped on the small metal plate. The extruded tail end of the qualified bars with a diameter greater than 20.00 mm shall also be stamped with the word "W".
Stamp of the supplier's technical supervision department;
b) Alloy grade;
c) Supply status;
d) Batch number.
6.2 Packaging, transportation and storage
6.2.1 After oxidation treatment, the bars are coated with dehydrated (foam removed) gun oil preheated to above 100℃. The gun oil should comply with the provisions of SY1502 (neutral or weakly alkaline vaseline containing 6% refined wax is allowed to replace gun oil. Vaseline should comply with the provisions of SH0039.). 6.2.2 For other requirements for packaging, transportation and storage, refer to the relevant provisions of GB/T3199. 6.3 Quality Certificate
Each batch of bars shall be accompanied by a quality certificate that complies with the requirements of this standard, which shall indicate: supplier’s name, address, telephone number and fax number; a)
b) product name;
c) alloy grade;
d) specification;
e) supply status;
f) batch number;
g) net weight or number of pieces;
h) various analysis and test results and stamp of the technical supervision department; i) this standard number;
j) date of manufacture.
Contract content
The contract for ordering products listed in this standard should include the following contents: a) product name;
b) alloy grade;
c) material state;
d) size specifications;
e) weight;
f) matters that should be specified in the contract as required by this standard; g) number of this standard;
h) negotiation results when adding contents beyond this standard. GB/T 5155-2003
New grade
Appendix A
(Informative Appendix)
Comparison table of new and old grades
Old grade
New status
Appendix B
(Informative Appendix)
Comparison table of new and old status
Old status
GB/T 5155—20034 Sampling
The sampling of bars shall comply with the provisions of Table 5.
Table 5 Sampling Provisions
Inspection Items
Chemical Composition
Dimension Deviation
Surface Quality
Room Temperature Mechanics
Macrostructure
Sampling Location
GB/T 17432
Any Location
Extrusion Front End
Extrusion Tail End
5.5 Determination of Inspection Result
Sampling Quantity
Refer to GB/T17432
Inspection of Each Root
10% of the number of roots shall be taken for each batch (furnace), not less than 2 roots, and one specimen shall be taken for each root. If there are provisions for non-proportional elongation strength requirements, only 50% of the number of specimens shall be measured, but not less than 2
10% of the number of roots shall be taken for each batch, not less than 2 roots. Requirement of taking one sample from each bar
Chapter number
Test method
Chapter number
5.5.1 When the chemical composition is unqualified, the melting (or batch) is judged to be unqualified. When the size and surface quality are unqualified, it is considered a single piece unqualified. 5.5.2 If any one of the mechanical properties is unqualified, double the number of samples (including the unqualified ones themselves) must be taken from the batch (furnace) for re-inspection. If the re-inspection result is unqualified, the batch will be scrapped, or the supplier will check each bar one by one, and the qualified ones will be delivered. 5.5.3 For bars that are unqualified due to tail shrinkage, coarse grain rings, and stratification in the macrostructure, it is allowed to cut off a certain length of the unqualified bars and re-inspect until they are qualified. The remaining bars are either inspected one by one and delivered if they are qualified, or they are cut off according to the maximum tail length of the bars that have been re-inspected to be qualified and then delivered. When other defects occur, the batch of bars will be handled by negotiation between the supply and demand parties. 6 Marking, packaging, transportation, storage
6.1 Marking
The marking of the packaging box of bars shall refer to the relevant provisions of G3/T3199. The front end of the qualified products shall be stamped (or a metal plate with a corresponding stamp shall be hung). The front end of the qualified bars with a diameter greater than 35.00 mm shall be stamped with the following a), b), c), d); the front end of the qualified bars with a diameter of 21.00 mm to 35.00 mm shall be stamped with the following b), c); the front end of each box of bars shall be hung with two small plates with the following a), b), c), d); for the qualified bars with a diameter less than or equal to 20.00 mm, the following a), b), c), d) shall be stamped on the small metal plate. The extruded tail end of the qualified bars with a diameter greater than 20.00 mm shall also be stamped with the word "W".
Stamp of the supplier's technical supervision department;
b) Alloy grade;
c) Supply status;
d) Batch number.
6.2 Packaging, transportation and storage
6.2.1 After oxidation treatment, the bars are coated with dehydrated (foam removed) gun oil preheated to above 100℃. The gun oil should comply with the provisions of SY1502 (neutral or weakly alkaline vaseline containing 6% refined wax is allowed to replace gun oil. Vaseline should comply with the provisions of SH0039.). 6.2.2 For other requirements for packaging, transportation and storage, refer to the relevant provisions of GB/T3199. 6.3 Quality Certificate
Each batch of bars shall be accompanied by a quality certificate that complies with the requirements of this standard, which shall indicate: supplier’s name, address, telephone number and fax number; a)
b) product name;
c) alloy grade;
d) specification;
e) supply status;
f) batch number;
g) net weight or number of pieces;
h) various analysis and test results and stamp of the technical supervision department; i) this standard number;
j) date of manufacture.
Contract content
The contract for ordering products listed in this standard should include the following contents: a) product name;
b) alloy grade;
c) material state;
d) size specifications;
e) weight;
f) matters that should be specified in the contract as required by this standard; g) number of this standard;
h) negotiation results when adding contents beyond this standard. GB/T 5155-2003
New grade
Appendix A
(Informative Appendix)
Comparison table of new and old grades
Old grade
New status
Appendix B
(Informative Appendix)
Comparison table of new and old status
Old status
GB/T 5155—20033 Quality Certificate
Each batch of bars shall be accompanied by a quality certificate that complies with the requirements of this standard, which shall indicate: supplier's name, address, telephone number and fax number; a)
b) product name;
c) alloy grade;
d) specification;
e) supply status;
f) batch number;
g) net weight or number of pieces;
h) various analysis and test results and stamp of the technical supervision department; i) this standard number;
j) date of manufacture.
Contract content
The contract for ordering products listed in this standard should include the following contents: a) product name;
b) alloy grade;
c) material state;
d) size specifications;
e) weight;
f) matters that should be specified in the contract as required by this standard; g) number of this standard;
h) negotiation results when adding contents beyond this standard. GB/T 5155-2003
New grade
Appendix A
(Informative Appendix)
Comparison table of new and old grades
Old grade
New statusbzxZ.net
Appendix B
(Informative Appendix)
Comparison table of new and old status
Old status
GB/T 5155—20033 Quality Certificate
Each batch of bars shall be accompanied by a quality certificate that complies with the requirements of this standard, which shall indicate: supplier's name, address, telephone number and fax number; a)
b) product name;
c) alloy grade;
d) specification;
e) supply status;
f) batch number;
g) net weight or number of pieces;
h) various analysis and test results and stamp of the technical supervision department; i) this standard number;
j) date of manufacture.
Contract content
The contract for ordering products listed in this standard should include the following contents: a) product name;
b) alloy grade;
c) material state;
d) size specifications;
e) weight;
f) matters that should be specified in the contract as required by this standard; g) number of this standard;
h) negotiation results when adding contents beyond this standard. GB/T 5155-2003
New grade
Appendix A
(Informative Appendix)
Comparison table of new and old grades
Old grade
New status
Appendix B
(Informative Appendix)
Comparison table of new and old status
Old status
GB/T 5155—2003
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