GB/T 22641-2020Wrought aluminium alloy sheets and plates for ships (English PDF)

1 Scope

This Standard specifies the requirements, test methods, inspection rules and signs, packaging, transportation, storage, quality certificate and order form (or contract) contents of wrought aluminium alloy sheets and plates for ships.

This Standard applies to wrought aluminium alloy sheets and plates for ships (hereinafter referred to as plates).

2 Normative references

The following documents are indispensable for the application of this document.

For dated references, only the dated version applies to this document. For undated references, the latest edition (including all amendments) applies to this document.

GB/T 232, Metallic materials - Bend test

GB/T 3190, Wrought aluminum and aluminum alloy - Chemical composition

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 3880.1, Wrought aluminium and aluminium alloy plates, sheets and strips for general engineering - Part 1: Technical conditions of delivery

GB/T 3880.3-2012, Wrought aluminium and aluminium alloy plates, sheets and strips for general engineering - Part 3: Tolerances on forms and dimensions

GB/T 6519, Ultrasonic inspection of wrought aluminium and magnesium alloy products

GB/T 7999, Optical emission spectrometric analysis method of aluminum and aluminum alloys

3 Requirements

For the plate, of which the thickness is not less than 6.00 mm, when ultrasonic flaw detection performance is required, the supplier and the buyer shall negotiate and indicate the ultrasonic flaw detection and inspection level in the order form (or contract).

4 Test method

5 Inspection rules

5.7.3 When the dimension deviation of any of the samples is unqualified, judge the batch of plates as unqualified. With the permission of the buyer, it can be inspected one by one on the supplier side; the qualified ones can be delivered.

5.7.4 When the mechanical property test result of any sample is unqualified, a double number of samples shall be taken from the batch (including the original unqualified ones) for repeated testing. If the repeated test is qualified, judge the batch of plates as qualified. If there are still unqualified ones in the repeated test, judge the batch of plates as unqualified. However, the supplier is allowed to perform a repeated heat treatment to re-sample and test.

5.7.5 When the bending performance of any sample is unqualified, a double number of samples shall be taken from the batch (including the original unqualified ones) for repeated testing. If the repeated test is qualified, judge the batch of plates as qualified. If there are still unqualified ones in the repeated test, judge the batch of plates as unqualified. However, the supplier is allowed to perform a repeated heat treatment to re-sample and test.

5.7.6 When the exfoliation corrosion resistance of any sample is unqualified, judge the batch of plates to be unqualified. However, the supplier is allowed to perform a repeated heat treatment to re-sample and test.

5.7.7 When the intergranular corrosion of any sample is unqualified, judge the batch of plates to be unqualified. However, the supplier is allowed to perform a repeated heat treatment to re-sample and test.

5.7.8 When the macro-structure performance of any sample is unqualified, judge the batch of plates to be unqualified.

5.7.9 When the microstructure of any sample is unqualified, if the heat treatment furnace number of the plates can be distinguished, judge the furnace number to be unqualified; if the furnace number cannot be distinguished, judge the batch of plates to be unqualified.

5.7.10 When the ultrasonic flaw detection result of any sample is unqualified, judge the piece of plate to be unqualified.

5.7.11 When the appearance quality of any sample is unqualified, judge the piece of plate to be unqualified.

5.7.12 When there are other defects, they shall be dealt with by negotiation between the supplier and the buyer.

6 Signs, packaging, transportation, storage and quality certificate

b) Product name:

c) Designation, supply status and dimensions;

d) Quantity (piece number or weight) and number of pieces;

e) Chemical composition;

f) Mechanical property test result;

g) Batch number, smelt number;

h) Contract number;

i) Ordering unit;

j) Number of this Standard;

k) Date of packaging;

l) The signatures or seals of the inspectors and persons in charge of the technical supervision department, and the signatures or seals of the surveyor;

m) Special mark for aluminum materials for ships.

7 Order form (or contract) contents

The order form (or contract) that orders the products which are listed in this Standard shall include the following:

a) Product name.

b) Designation.

c) Supply status.

d) Dimensions.

e) Weight (or quantity).

f) Special requirements of the buyer.

-- special dimension deviation requirements;

-- coating layer thickness detection requirements;

-- bending performance test requirements; […]