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GB/T 6893-2022 English PDF (GBT6893-2022)

GB/T 6893-2022 English PDF (GBT6893-2022)

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GB/T 6893-2022: Aluminium and aluminium alloys cold drawn (rolled) tubes

This document specifies the category, quality assurance, technical requirements, test methods, inspection rules and signs, packaging, transportation, storage, quality certificates and purchase orders (or contracts) of aluminum and aluminum alloy drawn (rolled) tubes. This document applies to aluminum and aluminum alloy drawn (rolled) seamless tubes and seamed tubes (hereinafter referred to as "tubes").
GB/T 6893-2022
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 77.150.10
CCS H 61
Replacing GB/T 6893-2010
Aluminum and aluminum alloys cold drawn (rolled) tubes
ISSUED ON: MARCH 09, 2022
IMPLEMENTED ON: OCTOBER 01, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 6
4 Categories ... 7
5 Quality assurance ... 8
6 Technical requirements ... 9
7 Test method ... 16
8 Inspection rules ... 20
9 Marking, packaging, transportation, storage, quality certificate ... 24 10 Order form (or contract) content ... 25
Appendix A (Informative) Process control of aluminum alloy tubes for aviation ... 26 Appendix B (Normative) Quality assurance of aluminum alloy tubes for automobiles ... 31
Aluminum and aluminum alloys cold drawn (rolled) tubes
1 Scope
This document specifies the category, quality assurance, technical requirements, test methods, inspection rules and signs, packaging, transportation, storage, quality certificates and purchase orders (or contracts) of aluminum and aluminum alloy drawn (rolled) tubes.
This document applies to aluminum and aluminum alloy drawn (rolled) seamless tubes and seamed tubes (hereinafter referred to as "tubes").
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) is applicable to this standard.
GB/T 242 Metal materials - Tube - Drift-expending test
GB/T 244 Metallic materials - Tube - Bend test
GB/T 246 Metallic materials - Tube - Flattening test
GB/T 467 Copper cathode
GB/T 470 Zinc ingots
GB/T 3190 Chemical composition of wrought aluminium and aluminium alloys GB/T 3199 Wrought aluminium and aluminium alloy products - Packing, marking, transporting and storing
GB/T 3246.1 Inspection method for structure of wrought aluminum and aluminum alloy products Part 1: Inspection method for microstructure
GB/T 3246.2 Inspection method for structure of wrought aluminum and aluminum alloy products - Part 2: Inspection method for macrostructure
GB/T 3251 Compression test method for aluminium and aluminium alloys tubes GB/T 3499 Magnesium ingots
after the compression test. If the purchaser has compression performance requirements for other alloys, it shall be determined through negotiation between the supplier and the purchaser, meanwhile it shall be specified in the order form (or contract). 6.6 Flattening test
There shall be no cracks on the surface of 5B02 alloy and 5A02 alloy's O status tubes for aviation use, after the flattening test. If the buyer has flattening performance requirements for other alloys, it shall be determined through negotiation between the supplier and the buyer, AND specified in the order (or contract).
6.7 Bending test
After the bending test of 5B02 alloy tubes for aviation, there shall be no cracks on the surface. If the buyer has flattening performance requirements for other alloys, it shall be determined through negotiation between the supplier and the buyer, AND specified in the order (or contract).
6.8 Air tightness
When the buyer has airtight requirements for the seamed tube, it shall be determined through negotiation between the supplier and the buyer, AND indicated in the order form (or contract).
6.9 Microstructure
The microstructure of the quenched tube shall not have over-burning.
6.10 Macrostructure
The surface grain size of 3A21 aluminum alloy tubes for aviation shall be better than the second grade in GB/T 3246.2. If the purchaser has macrostructure requirements for other alloys, it shall be determined through negotiation between the supplier and the purchaser AND specified in the order form (or contract).
6.11 Solderability
Seamed tubes shall not have poor welding.
6.12 Salt spray corrosion resistance
6.12.1 The salt spray corrosion resistance grade of aluminum alloy tubes for automobiles shall comply with the requirements in Table 4. The salt spray corrosion resistance grade shall be specified in the order form (or contract); grade I shall be used if not specified.
6.12.2 After the test according to the test duration specified in Table 4, the tube shall have no leakage. When the buyer has requirements on the micro-corrosion appearance, outer surfaces of the tube shall be smooth and clean.
6.15.2 There shall be no defects such as blisters, peeling, cracks, corrosion, inner surface waves on the surface of tubes.
6.15.3 The outer surface of the tube is allowed to have defects such as scratches, damages, bumps and other defects, whose depth does not exceed the negative deviation of the wall thickness.
6.15.4 Water marks and straightening marks, that do not affect the wall thickness, are allowed on the surface of the tube.
7 Test method
7.1 Chemical composition
7.1.1 The chemical composition analysis method shall comply with the provisions of GB/T 20975 (all parts) or GB/T 7999. The arbitration analysis method shall adopt the method specified in GB/T 20975 (all parts).
7.1.2 The calculation of "Al" content shall comply with the provisions of GB/T 3190. When calculating the "Al" content, the sum -- of the analytical values of conventionally analyzed elements and unconventional analyzed elements suspected to be excessive -- is taken as the "sum of element content".
7.1.3 The rounding off comparison method is used to determine the analytical value. The numerical rounding off rules are carried out, in accordance with the relevant provisions of GB/T 8170. The rounding off digits shall be consistent with the limit digits, which are specified in GB/T 3190.
7.2 Dimensional deviation
The measurement method of dimensional deviation shall be carried out, according to the provisions of GB/T 4436-2012.
7.3 Mechanical properties
The tensile mechanical property test at room temperature shall be carried out, according to the provisions of GB/T 16865.
7.4 Flaring test
7.4.1 5B02 and 5A02 alloy O status seamless tubes for aviation
The test shall be carried out, according to the provisions of GB/T 242; the flare shall have a flare taper of 74??; the length of the specimen shall be 1.5 times the outer diameter, BUT not less than 50 mm; the flare dimensions shall comply with the provisions in Visual inspection is used for the appearance quality. When the depth of the defect cannot be determined, the grinding method can be used for measurement. For tubes which have an inner diameter of 12 mm ~ 50 mm, the inner surface can be inspected with an endoscope.
8 Inspection rules
8.1 Inspection and acceptance
8.1.1 The tubes shall be inspected by the technical supervision department of the supplier, to ensure that the product quality complies with the provisions of this document and the purchase order (or contract); meanwhile it shall fill in the quality certificate.
8.1.2 The purchaser shall inspect the received product, according to the provisions of this document. If the inspection result is inconsistent with the provisions of this document and the purchase order (or contract), it shall submit it to the supplier in writing; the supplier and the purchaser shall negotiate to resolve it. Disputes related to appearance quality and size deviation shall be raised, within one month from the date of receipt of the product; objections related to other performance shall be raised, within three months from the date of receipt of the product. If arbitration is required, both the supplier and the buyer shall jointly conduct arbitration sampling at the buyer. 8.2 Group-batching
The tubes shall be submitted for acceptance in batches. Each batch shall be composed of the same category, designation, status, size specification. The batch weight is not limited.
8.3 Weighing
Tubes shall be weighed to check their weight (unless otherwise agreed upon by both parties).
8.4 Inspection items
8.4.1 Each batch of products shall be inspected for chemical composition, dimensional deviation, mechanical properties, appearance quality before leaving the factory; the microstructure inspection shall also be carried out for quenched tubes. When the buyer has requirements for eddy current testing, eddy current testing shall also be carried out. 8.4.2 The flaring performance, flattening test, bending test, intergranular corrosion inspection shall be carried out, before the 5B02 alloy tubes for aviation leave the factory. 8.4.3 The 1035 designation tube in O-status for aviation shall also undergo compression inspection before leaving the factory.
8.6.1 When the chemical composition of any specimen is unqualified, if the tube's melting No. can be distinguished, the tube melting No. represented by the specimen is judged to be unqualified; the tubes of other melting No. are inspected in turn; the melting No. is judged one by one. If the melting No. cannot be distinguished, the batch of tubes is judged to be unqualified.
8.6.2 If the dimensional deviation of any tube or any specimen is unqualified, the batch of tubes shall be judged unqualified; however, the supplier is allowed to inspect it one by one, AND the qualified ones shall be delivered.
8.6.3 If the mechanical properties of any specimen are unqualified, it shall take double quantity of specimens from this batch of products (including the unqualified product in the original inspection) (or the product represented by the unqualified specimens), for repeated test. If the repeated test results are all qualified, the batch of products is judged to be qualified. If the repeated test results are still unqualified, the batch of products shall be judged as unqualified. Upon agreement between the supplier and the buyer, the batch of products can be inspected one by one by the supplier, AND the qualified ones will be delivered. OR it may carry out repeated heat treatment and re-sampling. 8.6.4 If the flaring performance of any specimen is unqualified, it shall take double quantity of specimens from this batch of products (including the unqualified product in the original inspection) (or the product represented by the unqualified specimens), for repeated test. If the repeated test results are all qualified, the batch of products is judged to be qualified. If the repeated test results are still unqualified, the batch of products shall be judged as unqualified. Upon agreement between the supplier and the buyer, the batch of products can be inspected one by one by the supplier, AND the qualified ones will be delivered. OR it may carry out repeated heat treatment and re-sampling. 8.6.5 If the compression test of any specimen is unqualified, it shall take double quantity of specimens from this batch of products (including the unqualified product in the original inspection) (or the product represented by the unqualified specimens), for repeated test. If the repeated test results are all qualified, the batch of products is judged to be qualified. If the repeated test results are still unqualified, the batch of products shall be judged as unqualified. Upon agreement between the supplier and the buyer, the batch of products can be inspected one by one by the supplier, AND the qualified ones will be delivered. OR it may carry out repeated heat treatment and re-sampling. 8.6.6 If the flattening test of any specimen is unqualified, it shall take double quantity of specimens from this batch of products (including the unqualified product in the original inspection) (or the product represented by the unqualified specimens), for repeated test. If the repeated test results are all qualified, the batch of products is judged to be qualified. If the repeated test results are still unqualified, the batch of products shall be judged as unqualified. Upon agreement between the supplier and the buyer, the batch of products can be inspected one by one by the supplier, AND the qualified ones will be delivered. OR it may carry out repeated heat treatment and re-sampling. 8.6.7 If the bending test of any specimen is unqualified, it shall take double quantity of specimens from this batch of products (including the unqualified product in the original inspection) (or the product represented by the unqualified specimens), for repeated test. If the repeated test results are all qualified, the batch of products is judged to be qualified. If the repeated test results are still unqualified, the batch of products shall be judged as unqualified. Upon agreement between the supplier and the buyer, the batch of products can be inspected one by one by the supplier, AND the qualified ones will be delivered. OR it may carry out repeated heat treatment and re-sampling.
8.6.8 If the airtightness of any specimen is unqualified, the batch of tubes shall be judged as unqualified.
8.6.9 If the microstructure of any specimen is unqualified, the batch of tubes shall be judged unqualified.
8.6.10 If the macrostructure of any specimen is unqualified, it shall take double quantity of specimens from this batch of products (including the unqualified product in the original inspection) (or the product represented by the unqualified specimens), for repeated test. If the repeated test results are all qualified, the batch of products is judged to be qualified. If the repeated test results are still unqualified, the batch of products shall be judged as unqualified.
8.6.11 If the weldability of any specimen is unqualified, the batch of tubes shall be deemed unqualified.
8.6.12 If the salt spray corrosion of any specimen is unqualified, it shall take double quantity of specimens from this batch of products (including the unqualified product in the original inspection) (or the product represented by the unqualified specimens), for repeated test. If the repeated test results are all qualified, the batch of products is judged to be qualified. If the repeated test results are still unqualified, the batch of products shall be judged as unqualified. Upon agreement between the supplier and the buyer, the batch of products can be inspected one by one by the supplier, AND the qualified ones will be delivered. OR it may carry out repeated heat treatment and re-sampling. 8.6.13 If the intergranular corrosion of any specimen is unqualified, it shall take double quantity of specimens from this batch of products (including the unqualified product in the original inspection) (or the product represented by the unqualified specimens), for repeated test. If the repeated test results are all qualified, the batch of products is judged to be qualified. If the repeated test results are still unqualified, the batch of products shall be judged as unqualified. Upon agreement between the supplier and the buyer, the batch of products can be inspected one by one by the supplier, AND the qualified ones will be delivered. OR it may carry out repeated heat treatment and re-sampling. 8.6.14 If the eddy current flaw detection of any product is unqualified, the tube shall be judged unqualified.
8.6.15 If the appearance quality of any product is unqualified, the tube shall be judged as unqualified.
9 Marking, packaging, transportation, storage, quality
certificate
9.1 Marking
9.1.1 Product marking
Marks shall be made on the tubes that pass the inspection. The marks shall at least include the following contents:
a) Batch number;
b) Designation;
c) Status;
d) The inspection seal of the supplier's technical supervision department (or the signature or seal of the quality inspection personnel).
9.1.2 Packaging box marking
The packing box mark of the tube shall comply with the provisions of GB/T 3199. 9.2 Packaging, transport, storage
9.2.1 The tubes are packed without greasing. When greasing is required, it shall be negotiated between the supplier and the purchaser AND indicated in the order (or contract).
9.2.2 Tubes, which have an outer diameter not greater than 30 mm, shall be bundled and wrapped in paper.
9.2.3 Other packaging, transport, storage shall be implemented, in accordance with the provisions of GB/T 3199.
9.3 Quality certificate
Each batch of tubes shall be accompanied by a product quality certificate, which indicates:
a) Supplier name;
b) Batch number;
Appendix A
(Informative)
Process control of aluminum alloy tubes for aviation
A.1 Procedures for developing process control documents
After the supplier has the ability to produce qualified products according to the requirements specified in this document, it must carry out the necessary material certification. Before the material certification, the supplier can prepare process control documents, according to the product production process control requirements, which are specified in this document. In order to ensure the stability of material quality, the requirements related to the production or production of this product are specified in the process control documents. The procedures for formulating process control documents are as follows:
a) The supplier produces specified batches of products, that meet the requirements of this document according to the needs of users;
b) The supplier has a complete third-party quality certification system; c) The supplier formulates process control documents according to the contents specified in this document;
d) Both the supplier and the purchaser confirm the process control documents, which can only be executed after the confirmation.
A.2 Process control scope and requirements
A.2.1 Process control scope
In order to ensure the effectiveness of material process control, process control documents include the following:
a) Raw material requirements;
b) Process requirements;
c) Equipment requirements;
d) Performance requirements.
A.2.2 Raw material requirements
A.2.2.1 Raw material process control includes supplier qualification confirmation and process. The process control retains the corresponding test reports or certification documents.
A.2.5.2 The performance requirements in the product evaluation stage shall be tested, according to the terms specified in 8.4.1 ~ 8.4.5, by both the supplier and the buyer to select the items to be tested.
A.2.5.3 After the product is stably supplied, in addition to testing according to the requirements of 8.4.1, the supplier shall carry out process control on the following performance requirements:
- Eddy current flaw detection is carried out for each batch; the eddy current flaw detection complies with the provisions of 6.14;
- Calculate the coefficient of variation of tensile mechanical properties at room temperature for every 10 batches. The coefficient of variation is not greater than 3%. The calculation is carried out, according to the formula (A.1):
Where:
Cv - Coefficient of variation;
?? - Standard deviation;
- Average value.
- Each batch is subject to macrostructure testing; the macrostructure shall comply with the provisions of 6.10.
A.3 Process control review and deviation handling
A.3.1 Review committee
A.3.1.1 The supplier should establish a review committee, that is composed of at least 3 people, to be responsible for reviewing and disposing of products that deviate from the process control requirements.
A.3.1.2 The review committee should include at least two material professionals and one system profes...

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