This standard specifies the contract content, requirements, test methods, inspection rules and marking, packaging, transportation, storage, etc. of aluminum and aluminum alloy hot extruded pipes. This standard applies to aluminum and aluminum alloy hot extruded seamless round pipes for general industrial use. GB/T 4437.1-2000 Aluminum and aluminum alloy hot extruded pipes Part 1: Seamless round pipes GB/T4437.1-2000 Standard download decompression password: www.bzxz.net

GB/T4437.12000
This standard is based on GB/T4437-1984 "Aluminum and aluminum alloy extruded tubes" and is compiled in accordance with the provisions of GB/T1.1--1993.
The new version has major changes in the following contents: ·Add "Foreword", add "Scope", "Cited Standards" and "Contract Contents". Chapter 1 "Varieties" of the original standard is cancelled according to the requirements of GB'T1:1, and the remaining contents are merged into the various articles of Chapter 3 "Requirements" of this standard. The newly promulgated alloy grades and state numbers of the country are adopted, and several commonly used foreign alloy grades are added; the unit of mechanical performance indicators is MPa; the mechanical performance indicators and column methods of the introduced alloys use the data and regulations in ASTMB221M:1995, ASTMB241M:1995, JISH4080:1988, ISO6362-2:1990; the original standard 3.7 nitrate salt trace test method is cancelled. This standard replaces GB/T4437-1984 from the date of implementation. This standard is proposed by the State Bureau of Nonferrous Metals Industry. This standard is under the jurisdiction of the China Nonferrous Metals Industry Standard Metrology and Quality Research Institute. The drafting unit of this standard is Northeast Light Alloy Co., Ltd. The main drafters of this standard are Liu Liying, Wang Guojun and Liang Yan. 532
National Standard of the People's Republic of China
Aluminium and aluminium alloy hot-extruded tubes
Part 1: Seamless round tubes
Aluminium and aluminium alloy extruded tubesPart 1: Seamless tubes
GB/T4437.12000
Replaces GB/T 4437---1984
This standard specifies the contract content, requirements, test methods, inspection rules and marking, packaging, transportation and storage of aluminium and aluminium alloy hot-extruded tubes.
This standard applies to aluminium and aluminium alloy hot-extruded seamless round tubes for general industrial use. 2 Cited standards
The clauses contained in the following standards constitute the clauses of this standard by being referenced in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T228--1987 Metal tensile test method
GB/T3190—1996 Chemical composition of deformed aluminum alloys GB/T3199-1996 Packaging, technology, transportation and storage of aluminum and aluminum alloy processed products GB/T3246—2000 Organization inspection method for aluminum and aluminum alloy processed products GB/T4436-1995 Dimensions and allowable deviations of aluminum and aluminum alloy pipes GB/T6987.1~~6987.21-1986 Chemical analysis methods for aluminum and aluminum alloys GB/ T6987.22~6987.23—1987 Chemical analysis methods for aluminium and aluminium alloys GB/T6987.24—1988 Chemical analysis methods for aluminium and aluminium alloys Test specimens for tensile test of deformed aluminium, magnesium and their alloy products GB/T16865—1997
GB/T17432—1998
Sampling methods for chemical composition analysis of deformed aluminium and aluminium alloys 3 Requirements
3.1 Brand and state
The brand and state of the pipe shall comply with the requirements of Table 1. Table 1
1100 1200 2A11
2A1220243003
3A215A02 5052
6A026061
7A158A06
2017 2A12
Approval of State Administration of Quality and Technical Supervision on 2000-06-09
Implementation on 2000-11-01
Alloy brand
20172A126A0260616063
6A026061
GB/T 4437.1—2000
Table 1 (end)
7A0970757A15
Note: If the user needs other alloy states, it can be determined through negotiation between the two parties. 3.2 Marking example
2A12 alloy annealing state, outer diameter 40mm, wall thickness 6mm, length 4000mm fixed length hot extrusion tube marked as tube 2A12-40×6×4000GB/T4437.1--20003.3 Chemical composition
The chemical composition of the pipe shall comply with the provisions of GB/T3190. 3.4 Overall dimensions and allowable deviations
The overall dimensions and allowable deviations of the pipe shall comply with the provisions of the ordinary grade in GB/T4436. When high-precision grades are required, they should be indicated in the contract. 3.5 Mechanical properties
The room temperature longitudinal mechanical properties of the pipe shall comply with the provisions of Table 2. However, the non-proportional elongation stress specified for 5A05 alloy in the table is only for reference and is not used as a basis for acceptance. For pipes with an outer diameter of 185~~300mm and a wall thickness greater than 32.5mm, the room temperature longitudinal mechanical properties shall be negotiated by the supply and demand parties or with test results.
Alloy grade
1070A,1060
1050A,1035
1100,1200
Supply status
H112, T4
Specimen status
Tensile strength
60~~100
95~130
Specified non-proportional elongation|| tt||Stressomc.2.MPa
Elongation.forbzxz.net
Alloy grade
7A04.7A09
3.6Appearance quality
Supply status「Test status,
10,H12
H112、T6
H112、T6
H112、T6
GB/T 4437. 1
Table 2 (end)
Control strength
ou,MPa
170~240
270350
215-285
240～315
Specified non-proportional length
StressmMPa
3.6.1 The surface of the pipe is a hot extrusion surface. The surface should be smooth, and cracks, corrosion and foreign inclusions are not allowed. Elongation, %
3.6.2 The surface of the pipe is allowed to have local slight peeling and bubbles , abrasions, scratches, bumps, pressure pits, etc., the depth of which shall not exceed the allowable deviation range of the inner and outer diameters of the pipe, and ensure the minimum allowable size of the pipe. 3.6.3 The surface of the pipe is allowed to have extrusion flow lines caused by the mold, oxidation color and rough black and white spots. It is allowed to have correction spiral marks that do not affect the outer diameter size, and its depth shall not exceed 0.5mm. 3.7 Macrostructure
3.7.1 The macrostructure of the pipe is not allowed to have shrinkage tails, cracks, pores and foreign debris, but for pipes with a diameter greater than 150mm, any 535
GB/T 4437. 1 --- 2000
Inclusions not larger than 0.mm, the number of which shall not exceed three points. 3.7.2 The layering depth on the low-power test piece of the pipe shall not exceed half of the allowable diameter deviation. 3.8 Microstructure
The microstructure of the pipe shall not be allowed to be over-burned,
4 Test method
The chemical composition arbitration analysis of the pipe shall be carried out in accordance with GB/T6987. Sampling shall be carried out in accordance with GB/T17432. 4.1
The room temperature mechanical properties test of the pipe shall be carried out in accordance with GB/T228, and sampling shall be carried out in accordance with GB/T16 865 provisions 4.2
4.3 The microstructure and macrostructure inspection of the material shall be carried out in accordance with GB/T3246. 4.4 The surface quality of the pipe shall be inspected by naked eyes. For defects whose depth cannot be determined, they can be measured after grinding. Their depth shall not exceed the allowable deviation
4.5 The size inspection of the pipe shall be measured with a measuring tool with an accuracy of not less than (.02mm). 5 Inspection rules
5.1 Inspection and acceptance
The pipe shall be inspected by the supplier's technical supervision department and ensure that the product quality meets the requirements of this standard. 5.2 Batching
The pipes shall be submitted for acceptance in batches, and each batch shall consist of the same alloy, state and specification 5.3 Inspection Item H and Sampling
Inspection items, sampling positions and sampling quantity shall comply with the provisions of Table 3. Table 3
Inspection items
Chemical composition
Mechanical properties at room temperature
Dimension deviation
Macrostructure
Microstructure
Appearance quality
Sampling position
Sampling quantity
Conform to GB/T17432
Conform to GB/T17432
Cutting at the front end of extrusion
Any part
Cutting at the tail end of extrusion
High temperature zone
Any part
5.4 Determination of inspection results
Take 2% of the number of roots for each batch (heat treatment furnace). No less than 2 tubes, take 1 sample for each tube
Turn-by-Turn Inspection
Take 2% of the tube number for each batch, no less than 2 tubes, take 1 sample for each tube
Take 2% of the tube number for each batch (heat treatment furnace) of quenched tubes, no less than 2 tubes, take 1 sample for each tube
Turn-by-Turn Inspection
Required Article Number
Inspection Party's Specifications
Kill Number
5.4.1 If the chemical composition is unqualified, the melt (or batch) is judged to be unqualified. If the size and appearance quality are unqualified, it is a single piece unqualified. 5.4.2 If the mechanical properties are unqualified, double the number of samples (including the original unqualified pipes) should be taken from the batch (furnace) for re-inspection. If the re-inspection results are unqualified, the whole batch is judged to be unqualified. However, the batch of materials can be inspected by the supplier, and the qualified ones will be delivered. Or perform heat treatment and re-sample. 5.4.3 Macrostructure Even if one sample fails to meet the standard, double the number of samples should be taken from the batch of pipes for repeated inspection. If the repeated test results still fail, the batch will be scrapped. However, the supplier is allowed to check each pipe and deliver the qualified ones. If the pipes fail to meet the standard due to stratification or shrinkage, they should be cut until the macrostructure meets the standard.
5.4.4 If the microstructure fails to meet the standard, the batch (heat treatment furnace) is judged to be unqualified. 6 Marking, packaging, transportation and storage
6.1 Marking
GB/T 4437. 1 -2000
6.1.1 The marking of the packaging box of pipes shall comply with the provisions of GB/T3199. 6.1.2 For pipes with an outer diameter greater than 35 mm, the following marks should be stamped on the front end of each pipe: a) Inspection stamp of the supplier's technical supervision department;
b) Batch number;
c) Brand;
d) Status.
Note: For pipes that need to be delivered, the tail end of the extruded pipe shall be marked with "W\". 6.1.3 For pipes with an outer diameter of less than or equal to 35mm and a wall thickness of less than or equal to 7mm, at least five small signs or labels with the above marks shall be tied to the front end of the extruded pipe of each batch (box) of pipes to replace the above marks. 6.2 Packaging, transportation and storage
6.2.1 The packaging, transportation and storage of pipes shall comply with the provisions of GB/T3199. 6.2.2 For pipes with a diameter of less than or equal to 50mm and non-heat-treatable strengthening alloy pipes with a diameter of more than 50mm and a wall thickness of less than or equal to 7mm, they shall not be packed with oil, and other pipes shall be shipped bare. Note: Other packaging methods may be used after consultation between the supply and demand parties. 6.3 Quality certificate
Each batch of pipes shall be accompanied by a quality certificate that meets the requirements of this standard. It shall indicate: a) supplier name; b) batch number; c) brand and state; d) specification; e) net weight; f) mechanical property test results; g) stamp of technical supervision department; h) number of packing boxes (pieces); i) number of this standard; i) packing date. 7 Contract content The contract for ordering materials covered by this standard shall include the following content: a) product name; b) brand; c) state; d) specification; e) weight; f) number of this standard; g) packing; h) other special requirements.
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