GB/T 38106-2019Aluminum and aluminum alloy plates and sheets for pressure vessel (English PDF)

3.2 Chemical composition

The chemical composition of the plates and sheets shall comply with the provisions of GB/T 3190.

3.3 Dimension deviation

3.3.1 Thickness

The thickness deviation of the plates and sheets shall comply with the provisions of the ordinary grade of GB/T 3880.3-2012.

3.3.2 Width

The width deviation of the cold-rolled plates and sheets shall comply with the provisions of Table 6 in GB/T 3880.3-2012. The width deviation of the hot-rolled plates and sheets shall comply with the provisions for the trimming-supplied hot-rolled plates and sheets as shown in Table 7 of GB/T 3880.3-2012.

3.3.3 Length

The length deviation of the cold-rolled plates and sheets shall comply with the provisions of Table 10 in GB/T 3880.3-2012. The length deviation of the hot-rolled plates and sheets shall comply with the provisions for the trimming-supplied hot-rolled plates and sheets as shown in Table 11 of GB/T 3880.3-2012.

3.3.4 Unevenness

The unevenness deviation of the plates and sheets shall comply with the provisions for ordinary grade of unevenness in GB/T 3880.3-2012.

3.3.5 Side curvature

The side curvature deviation of the plates and sheets shall comply with the provisions for high-precision grade of side curvature of the plates and sheets in GB/T 3880.3-2012.

3.3.6 Diagonal

The diagonal deviation of the plates and sheets shall comply with the provisions for high-precision grade of diagonal of the plates and sheets in GB/T 3880.3-2012.

4.1 Chemical composition

4.1.1 The analysis method of chemical composition of the plates and sheets shall comply with requirements of GB/T 20975 or GB/T 7999; the arbitration analysis shall adopt the methods which are specified in GB/T 20975. The calculation of "Al" content shall comply with the provisions of GB/T 3190. When the "Al" content is calculated, take the sum value of the analytical values of the conventional analytical elements and the suspected excess unconventional analytical elements as the "sum of elemental content".

4.1.2 The determination of analysis value is based on the rounding comparison method; the value rounding rules shall be carried out in accordance with the relevant provisions of GB/T 8170; the rounding digit shall be consistent with the limit digits which are specified in GB/T 3190.

4.2 Dimensional deviation

Perform the measurement method of dimensional deviation in accordance with the provisions of GB/T 3880.3-2012.

4.3 Room-temperature tensile mechanical properties

Perform the test of room-temperature tensile mechanical properties in accordance with provisions of GB/T 16865.

4.4 Bending performance

Perform the test of bending performance in accordance with the provisions of GB/T 232.

4.5 Impact performance

Perform the test of impact performance in accordance with the provisions of GB/T 229.

4.6 Ultrasonic flaw detection performance

The ultrasonic flaw detection performance test shall be performed in accordance with GB/T 6519-2013.

4.7 Macro-structure

The macro-structure test shall be performed in accordance with GB/T 3246.2.

Microstructure Take 2 pieces per batch; take 1 sample from each piece. Take 2 samples from the batch of a single piece 3.9 4.8 Appearance quality Inspect piece by piece 3.10 4.9

5.6 Determination of the test result

5.6.1 When the chemical composition of any sample is unqualified, if the melting order of the product can be distinguished, judge the melting order that is represented by the sample as unqualified; inspect other melting orders in turn, and deliver the qualified ones. If the melting order cannot be distinguished, judge the batch as unqualified.

5.6.2 When the dimensional deviation of any plate is unqualified, judge the product as unqualified.

5.6.3 When the tensile mechanical properties at room temperature of any sample are unqualified, take double the number of samples from the batch of products to perform repeated tests; if the repeated test results are all qualified, judge the batch of products to be qualified. If the result of sample properties is still unsatisfactory in the repeated test, then, judge the batch of products to be unqualified. If it is agreed by both the supplier and the buyer, the supplier is allowed to inspect the products one by one and deliver those qualified ones.

The supplier is also allowed to perform a repeated heat treatment to re-sample and test.

5.6.4 When the bending performance of any sample is unqualified, take double the number of samples from the batch of products to perform repeated tests; if the repeated test results are all qualified, judge the batch of products to be qualified. If the result of sample properties is still unsatisfactory in the repeated test, then, judge the batch of products to be unqualified. If it is agreed by both the supplier and the buyer, the supplier is allowed to inspect the products one by one and deliver those qualified ones. The supplier is also allowed to perform a repeated heat treatment to re-sample and test.

5.6.5 When the impact performance of any sample is unqualified, judge the batch as unqualified. The supplier is allowed to inspect one by one and deliver those qualified ones.

5.6.6 When the ultrasonic flaw detection performance of any plate is unsatisfactory, judge the piece to be unqualified.

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

c) designation, state and specifications;

d) batch number;

e) net weight or box (piece), roll number;

f) code of this Standard;

g) inspection results of the analysis items and inspection stamp of the technical supervision department;

h) date of packaging (or date of manufacture).