GB/T 6892-2023Wrought aluminium and aluminium alloy extruded profiles for general engineering (English PDF)

4.4 Marking and examples

4.4.1 The profile mark which is not subject to surface treatment is represented in the order of product names, this document number, designation, state, cross-section code, fixed length. The marking examples are as follows: Example. The profile which has a designation 6063, T5 state, cross-section code YST01100001, length 4000 mm, is marked as follows: Profile GB/T 6892-6063T5-YST01100001 × 4000

4.4.2 The profile mark which is subject to surface treatment is represented in the order of product name and color (or color code), film code, this document number, designation, state, cross-section code, fixed length. The marking examples are as follows: Example 1. The silver white profile which has a film code AA20, designation 6063, T5 state, cross-section code YST01100001, length 4000 mm, is marked as follows:

7.1 Inspection and acceptance

7.1.1 The product shall be inspected by the supplier, to ensure that the product quality complies with the provisions of this document and the order form (or contract), meanwhile a quality certificate shall be filled out.

7.1.2 The purchaser shall inspect the received products, in accordance with the provisions of this document. If the inspection results are inconsistent with the provisions of this document and the order form (or contract), it shall be submitted to the supplier in writing, to be resolved through negotiation between the supplier and the buyer. Objections related to surface quality and dimensional deviation shall be raised, within 1 month from the date of receipt of the product. Objections to other performance shall be raised, within 3 months from the date of receipt of the product. If arbitration is needed, it can be entrusted to an organization, as recognized by both the supplier and the buyer; sampling can be done jointly at the buyer's premises.

7.2 Group-batching Products shall be submitted for acceptance in batches. Each batch shall be composed of products of the same designation, status, size specifications, film layer code, surface treatment process. When the purchaser requires group-batching according to melting number and heat treatment furnaces, this shall be noted in the order form (or contract).

7.3 Weighting Products shall be checked by weight.

7.4 Inspection items and process assurance items Where there are no special requirements specified in the order form (or contract), the product exit-factory inspection items, periodic inspection items, process assurance items shall comply with the provisions of Table 12.

7.5 Sampling The sampling of profiles shall comply with the requirements in Table 13.

7.6 Judgment of inspection results

7.6.1 Chemical composition When the chemical composition of any specimen fails, if the melting order of the profile can be distinguished, the melting order profile represented by the specimen will be judged to be unqualified; other melting order profiles will be inspected in sequence, the qualified ones will be delivered. If the melting order cannot be distinguished, the batch of profiles is deemed to be unqualified.

7.6.2 Size deviation If the size deviation of any specimen fails, the batch of profiles will be deemed unqualified. However, suppliers are allowed to inspect one by one; those that pass the standard will be delivered.

7.6.3 Tensile mechanical properties at room temperature, compression properties, bending properties, shear properties, fatigue properties, pin-type support, stress corrosion resistance, spalling corrosion resistance, intergranular corrosion sensitivity, salt spray corrosion resistance, welding performance

7.6.3.1 If any specimen fails, the batch (or heat treatment furnace number) of profiles will be deemed to be unqualified OR shall be implemented in accordance with 7.6.3.2.

7.6.3.2 If the heat treatment furnace number can be distinguished for the profile, it shall take double quantity of specimens from the heat treatment furnace number, which is represented by the specimen, to conduct repeated tests on the unqualified item. If the heat treatment furnace number cannot be distinguished, it shall take double quantity of specimens from the batch of profiles again, to repeat the test on the unqualified item (including the profile represented by the unqualified specimen taken for the first time). If all repeated test results are qualified, the batch (or heat treatment furnace number) of profiles will be deemed qualified. If there are still unqualified samples in the repeated test results, the batch (or heat treatment furnace number) of profiles will be deemed unqualified. After agreement between the supplier and the buyer, the supplier is allowed to inspect one by one; those that pass the test will be delivered or implemented in accordance with 7.6.3.3.

7.6.3.3 After repeated heat treatment, the supplier shall inspect all exit-factory inspection items listed in Table 12 according to the furnace number, except chemical composition, size deviation, film layer performance, appearance quality. The sampling quantity shall be as per Table

14.When all inspection results are qualified, the batch of profiles is deemed to be qualified; otherwise, the batch of profiles is deemed to be unqualified.

7.6.4 Plane strain fracture toughness If the plane strain fracture toughness KIc value or "batch release KQ" value of any specimen fails, the batch (or heat treatment furnace number) of the profile will be judged to be unqualified or shall be implemented in accordance with 7.6.3.2.

7.6.5 Conductivity If the conductivity of any specimen fails, follow 7.6.3.2.

7.6.6 Matching relationship between electrical conductivity and mechanical properties If the matching relationship between the electrical conductivity and mechanical properties of any specimen fails, the supplier will inspect each piece one by one; those that pass will be delivered. OR it is judged according to the test results of stress corrosion resistance, or implemented in accordance with 7.6.3.2.

7.6.7 Ultrasonic flaw detection acceptance level If the ultrasonic flaw detection acceptance level of any specimen fails, the profile will be deemed unqualified.

7.6.8 Welding performance of weld When the welding performance of the weld is unqualified, it is allowed to cut off a section from the extrusion front end of the hollow profile, to repeat the test, until it is qualified. Then other hollow profiles in the batch shall be cut according to the maximum length of the defect distribution of the inspected profile or one by one; the qualified products will be delivered.

7.6.9 Macrostructure When the macrostructure of any specimen fails, the judgment shall be made as follows:

a) If the profile fails due to metallurgical defects, such as cracks, bright grains, non- metallic inclusions, foreign metal inclusions, white spots, primary crystals, oxide films, the batch of profiles will be deemed unqualified. However, upon agreement between the supplier and purchaser, the supplier can inspect one by one and deliver the qualified products.

8.1 Marking

8.1.1 Product marking Product markings shall comply with the requirements of GB/T 42916.

8.1.2 Packing box markings The packaging box mark of the profile shall comply with the requirements of GB/T 3199.

8.2 Packaging, transportation, storage The profiles shall not be greased or packed; other aspects shall comply with the requirements of GB/T 3199.If the buyer needs applying grease, packing or using other packing means and methods different from GB/T 3199, it shall be determined through negotiation between the supplier and the purchaser. Meanwhile it shall be indicated in the order form (or contract). The transportation and storage of profiles shall comply with the requirements of GB/T 3199.

8.3 Quality certificate Each batch of profiles shall be accompanied by a product quality certificate, which shall indicate.

a) Name of supplier;

b) Product name;

c) Designations, status, size specifications (or model);

d) Code, color or color code of the surface-treated profile film layer;

e) Product batch number or production date;

f) Net weight or number of pieces;

g) This document number;

h) Various analysis and inspection results and inspection stamps from the supplier's quality inspection department;

i) Packaging date (or exit-factory date).