GB/T 33366-2016Wrought aluminium alloy extruded rods and bars for electron enginery-tank (English PDF)

3.1 Product categories

3.1.1 Grade, status and dimensions

Grade, status and diameter of the bars shall comply with the requirements of

Table 1.

Table 1 -- Grade, status and diameter

Grade Status

Diameter mm

6082 T6 30.0 ~ 350.0

3.1.2 Marking and examples

Product markings are expressed in the order of product name, number of this

Standard, grade, status and dimensions. Examples of markings are as follows:

Example 1:

The bar of grade 6082, status T6, diameter of 200.0 mm and random length, is marked as:

Bar GB/T 33366-6082T6-phi200

Example 2:

The bar of grade 6082, status T6, diameter of 200.0 mm and fixed length of

6000 mm, is marked as:

Bar GB/T 33366-6082T6-phi200×6000

3.2 Chemical composition

The chemical composition of the bar shall comply with the provisions of GB/T 3190.

3.3 Dimension deviation

3.3.1 Diameter

The diameter deviation of the bar shall comply with the requirements of Table

2.

Table 2 -- Diameter deviation In millimeters

3.3.2 Length

For bars which are supplied with a fixed length, its length allowable deviation is

+15

0 mm. For bars which are supplied with a double length, a 5-mm sawing allowance shall be added to each saw bite.

3.3.3 Cutting slope

The end face of the bar shall be cut flat. For bars whose diameter is less than

50.0 mm, the cutting slope is not more than 5°; for bars whose diameter is not less than 50.0 mm, the cutting slope is not more than 3°.

3.3.4 Bending

The bending of the bar shall comply with the requirements of Table 3.

Table 3 -- Bending of the bar In millimeters

Diameter

Bending of the bar

On a length of any 300 mm On the length of each meter

> 80.0 ~ 120.0 <= 1.0 <= 2.0

> 120.0 ~ 200.0 <= 1.5 <= 3.0

> 200.0 ~ 250.0 <= 2.0 <= 4.0

> 250.0 ~ 300.0 <= 3.0 -

> 300.0 ~ 350.0 <= 4.0 -

3.4 Tensile mechanical properties at room temperature

Diameter allowable deviation

Diameter

Positive deviation Negative deviation

The longitudinal tensile mechanical properties at room temperature of the bar shall comply with the requirements of Table 4. For bars whose diameter exceeds the requirements that are specified in Table 4, their longitudinal tensile mechanical properties at room temperature shall be negotiated between the supplier and the buyer and be indicated in the order form (or contract). The measured results shall be attached when it is not indicated.

Table 4 -- Tensile mechanical properties at room temperature

Grade Status

Diameter mm

Tensile strength R m

MPa

The specified non- proportional extension strength R p0.2

MPa

Elongation after break A

%

Not less than

6082 T6

>= 30 ~ 150 310 260 8

> 150 ~ 200 280 240 6

> 200 ~ 250 270 200 6

3.5 Brinell hardness

The Brinell hardness of the bar shall comply with the requirements of Table 5.

For bars whose diameter exceeds the requirements that are specified in Table

5, the Brinell hardness shall be negotiated between the supplier and the buyer and be indicated in the order form (or contract). The measured results shall be attached when it is not indicated.

Table 5 -- Brinell hardness

Alloy Status

Diameter mm

Brinell hardness HBW 6082 T6 60 ~ 200 >= 95

3.6 Conductivity

The conductivity of the 6082 alloy and T6 state shall comply with the requirements of Table 6. For bars whose specification exceeds that in Table 6, the conductivity shall be negotiated between the supplier and the buyer, and shall be indicated in the order form (or contract). If not specified, the measured results shall be attached.

Table 6 -- Conductivity

Alloy Status

Diameter mm

Conductivity

MS/m

6082 T6 60 ~ 200 >= 26

3.7 Low-magnification organization

3.7.1

The oxide film on the low-magnification organization sample of the bar shall comply with the requirements of Table 7.

Table 7 -- Oxide film

Name of the defect

Area under test

Defect length per point

<= 0.3 mm > 0.3 mm ~ 2.0 mm > 2.0 mm

Oxide film

Full cross- section

Allowed to exist <= 4 points

Not allowed to exist 3.7.2 The low-magnification organization sample of the bars are not allowed to have cracks, shrinkage tails, pores, bright grains, non-metallic inclusions, foreign metal inclusions, and spot defects such as white spots and primary crystals.

3.7.3

The layer depth on the low-magnification organization sample of the bar shall not exceed half the allowable negative deviation of the diameter of the bar.

When unlayered bars are required, it shall be negotiated between the supplier and the buyer and indicated in the order form (or contract).

3.8 Microstructure

The microstructure of the bar is not allowed to be overburnt.

3.9 Appearance quality

3.9.1

Cracks, bubbles or corrosive spots are not permitted on the surface of the bar.

3.9.2

The surface of the bar is allowed to have defects such as craters, scratches, bumps, scratches, oxidized colors, black and white spots and straightening marks that are not more than half the diameter negative deviation.

4.1 Chemical composition

4.1.1

The analysis method of chemical composition 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.

4.1.2

Perform routine chemical analysis only on the numerically specified elements other than those in the columns of the “Aluminum” and “Other” of grade-6082 in GB/T 3190. When the mass fraction of the non-routine analysis element is suspected to exceed the limit value of this Standard, the producer shall analyze these elements.

4.1.3

The “Al” content is calculated according to the method which is specified in 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”.

4.1.4

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 Size inspection

4.2.1 Bending

Place the bar on the platform; when it becomes stable by its dead weight, place a 300 mm (or 1 000 mm) long ruler (or knife ruler) against the surface of the bar along the length of the bar; measure the maximum gap value h s between the bar and the ruler (or knife ruler); then, h s is the bending of the length of every

300 mm (or every meter), as shown in Figure 1.

4.2.2 Bar diameter

The diameter of the bar shall be measured with a gauge of not less than 0.02 mm.

Figure 1

4.2.3 Length, cutting slope

The length and cutting slope of the bar shall be measured with a measuring instrument of a corresponding precision or a special instrument.

4.3 Tensile mechanical properties at room temperature

The test method of vertical tensile mechanical properties of the rod at room temperature shall be carried out in accordance with provisions of GB/T 16865.

4.4 Brinell hardness

The Brinell hardness test method of the bars shall be carried out in accordance

Platform with the provisions of GB/T 231.1.

4.5 Conductivity

The conductivity test of the bars shall comply with the provisions of GB/T 12966 or GB/T 3048.2. The arbitration shall be performed in accordance with the provisions of GB/T 3048.2.

4.6 Low-magnification organization

The test method of low-magnification organization of the bars shall comply with the provisions of GB/T 3246.2.

4.7 Microstructure

The test method of microstructure of the bars shall comply with the provisions of GB/T 3246.1.

4.8 Appearance quality

The surface quality of the bar shall be visually inspected; when the depth of the defect is difficult to determine, the grinding method can be used to measure.

5.1 Inspection and acceptance

5.1.1

The product shall be inspected by the supplier to ensure that the product quality complies with the requirements of this Standard and the order form (or the contract); the supplier shall fill in the quality certificate.

5.1.2

The buyer shall inspect the received products in accordance with the provisions of this Standard. If the test result is inconsistent with the provisions of this Standard and the order form (or the contract), a written form shall be submitted to the supplier; the issue shall be settled by negotiation between the supplier and the buyer. Objections of appearance quality and dimensional deviation shall be filed within 1 month from the date of receipt of the product;

objections of other performances shall be filed within 3 months from the date of receipt of the product. Arbitration, if required, may be carried out by an organization which is recognized by both the supplier and the buyer; the sampling shall be jointly done by the buyer.

5.2 Batch

Bars shall be submitted for acceptance in batches. Each batch shall consist of tubes of the same grade, status and dimensions.

5.3 Weight

The bars shall be weighed on the scales.

5.4 Inspection items

Each batch of bars, before being delivered, shall be tested for chemical composition, dimensional deviation, mechanical property, Brinell hardness, conductivity, low-magnification organization, microstructure and appearance quality.

5.5 Sampling

The sampling of the bars shall comply with the requirements of Table 8.

Table 8 -- Sampling regulations

Inspection items Sampling regulations

Required article number

Article number of the test method

Chemical composition According to the provisions of GB/T 17432 3.2 4.1

Dimensional deviation

The sampling amount is as specified in

Table 9

Tensile mechanical properties at room temperature a

The sampling quantity is as specified in

Table 9. Cut one sample at the extrusion front end of each bar.

Brinell hardness a

The sampling quantity is as specified in

Table 9. Cut one sample at the extrusion front end of each bar.

Conductivity a

The sampling amount is as specified in

Table 9

Low-magnification organization

The sampling quantity is as specified in

Table 9. Cut one sample at the extrusion end of each bar.

Microstructure a

The solution heat treatment furnace is cut at a high-temperature zone; the sampling quantity is 2

Appearance quality Test one by one 3.9 4.8 a

For the tensile mechanical properties at room temperature, Brinell hardness, conductivity and microstructure of the bar, the manufacturing plant takes samples by heat treatment number and by batch during arbitration.

Table 9 -- Sampling quantity

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 bar 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 sample is unqualified, judge the batch of bars as unqualified; however, it is allowed to inspect one by one, and deliver the qualified ones.

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 (or heat treatment furnace) of bars to perform repeated tests; if the repeated test results are all qualified, judge the batch (or heat treatment furnace) of bars to be qualified. If the sample properties are still unqualified in the repeated test result, then, judge the batch (or heat treatment furnace) of bars to be unqualified.

The supplier is allowed to inspect the products one by one and deliver those qualified ones. The supplier is also allowed to re-sample after another heat treatment to inspect the tensile mechanical properties at room temperature,

Brinell hardness, conductivity and microstructure.

5.6.4

When the Brinell hardness of any sample is unqualified, take double the number of samples from the batch (or heat treatment furnace) of bars to perform repeated tests; if the repeated test results are all qualified, judge the batch (or heat treatment furnace) of bars to be qualified. If the sample properties are still unqualified in the repeated test result, then, judge the batch (or heat treatment furnace) of bars to be unqualified. The supplier is allowed to inspect the products one by one and deliver those qualified ones. The supplier is also allowed to re-sample after another heat treatment to inspect the tensile mechanical properties at room temperature, Brinell hardness, conductivity and microstructure.

Number per batch or per furnace piece

Sampling quantity piece 5.6.5 When the conductivity of any sample is unqualified, judge the batch (or heat treatment furnace) of bars as unqualified; however, it is allowed to inspect one by one, and deliver the qualified ones. The supplier is also allowed to re- sample after another heat treatment to inspect the tensile mechanical properties at room temperature, Brinell hardness, conductivity and microstructure.

5.6.6

When the low-magnification organization of any sample is unqualified, judge as follows:

a) If it is unqualified because of metallurgical defects such as cracks, bright grains, non-metallic inclusions, foreign metal inclusions, white spots, primary crystals and oxide film, judge the batch of bars to be unqualified.

b) If it is unqualified because of layering and shrinkage, it is allowed to cut a portion from the extrusion end of the bar for repeated test until it is qualified;

then, other bars of the batch shall be tailed according to the maximum length of the above defect distribution of the tested bar OR inspected one by one; deliver the qualified ones.

5.6.7

When the microstructure of any sample is unqualified, judge the batch (or heat treatment furnace) of bars to be unqualified.

5.6.8

When the appearance quality of any sample is unqualified, judge the bar to be unqualified. However, it is allowed to cut the unqualified part for re- inspection and deliver the qualified ones.

6 Marking, packaging, transportation, storage and quality certificate

6.1 Marking

6.1.1 Product marking

The following markings (or labels) shall be printed on the accepted bars:

a) the inspection stamp of the supplier's quality inspection department (or the signature or stamp of the quality inspection personnel);

b) grade, status and dimensions;

c) bar batch number or date of manufacture.

6.1.2 Package marking

The package marking of the bar shall comply with the provisions of GB/T 3199.

6.2 Packaging, transportation, storage

The bars are not oiled and not packed; others are in accordance with the provisions of GB/T 3199. The packaging mode and method which needs oiling, packing or is different from GB/T 3199 shall be agreed upon by the supplier and the buyer, and shall be indicated in the order form (or contract).

6.3 Transportation and storage

The transportation and storage of the tubes shall comply with the provisions of

GB/T 3199.

6.4 Quality certificate

Each batch of bars shall be accompanied by a product quality certificate, which indicates:

a) the name of the supplier;

b) product name:

c) grade, status, dimensions;

d) product batch number or date of manufacture;

e) net weight or number of pieces;

f) various of analysis and test results;

g) the inspection stamp of the supplier's quality inspection department;

h) code of this Standard;

i) Date of packaging (or date of manufacture).