GB/T 34493-2017Aluminium alloys extruded rods for easy-cutting (English PDF)

3.8 Microstructure

The microstructure of the rod 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 rod.

3.9.2 Peeling on the surface of the rod, if any, shall be removed; however, the diameter of the rod after removal must not exceed the allowable deviation of the diameter.

3.9.3 Defects such as bruises, scratches, abrasions and indentations, of which the depth exceed the diameter deviation, AND straightening marks which are caused by straightening, are not allowed on the surface of the rod; however, the diameter of the rod, after the depth of the defect is deducted, must not exceed the allowable range of the diameter.

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 "Al" and "Other" of The test method of the shear performance of the rod is carried out in accordance with the provisions of GB/T 34487.

4.6 Low-magnification organization

The test method of the low-magnification organization of the rod is carried out in accordance with the provisions of GB/T 3246.2.

4.7 Microstructure

The test method of the microstructure of the rod is carried out in accordance with the provisions of GB/T 3246.1.

4.8 Appearance quality

Visually inspect the appearance quality under natural scattered light. If necessary, use dimensional measurement tools to define the defect size; determine the defect depth by grinding.

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 one month from the date of receipt of the product; objections of other performances shall be filed within three 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

Products shall be submitted for acceptance in batches. Each batch shall consist of products of the same grade, status and dimensions; the weight of each batch is not limited.

5.3 Weight

The product shall be weighed on the scales.

5.4 Inspection items

5.4.1 Each batch of products, before being delivered, shall be tested for chemical composition, dimensional deviation, tensile mechanical properties at room temperature, low-magnification organization and appearance quality.

5.4.2 Each batch of off-quenched rods shall be inspected for microstructure.

5.4.3 The machinability of the product is guaranteed by the supplier process.

When the buyer indicates the inspection in the order form (or contract), the machinability test shall be carried out.

5.4.4 The shear performance of the product is guaranteed by the supplier process. When the buyer indicates the inspection in the order form (or contract), the shear performance test shall be carried out.

5.5 Sampling

The sampling of the product shall comply with the requirements of Table 9.

Inspection items Sampling regulations Required article number Article number of the test method Chemical composition Perform according to the provisions of GB/T 17432 3.2 4.1 Dimensional deviation Test one by one 3.3 4.2 Tensile mechanical properties at room temperature a The sampling amount is as specified in Table 10. Cut one sample at the extrusion front end of each rod; other requirements are in accordance with GB/T 16865 3.4 4.3 Machinability When inspection is indicated in the order form (or contract), take 1 rod and cut 1 sample on the selected rod.

6.1 Marking

6.1.1 Product marking

6.1.1.1 The extrusion front end of the qualified rod shall be printed with the markings of the following contents (or be attached with labels of the following contents):

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) product batch number or date of manufacture.

6.1.1.2 The "W" mark (or label) shall be attached to the extrusion end of the qualified rod.

6.1.2 Package marking

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

6.2 Packaging

Rods are not oiled. Rods with the diameter of less than 50.00 mm shall be packed in a packaging box that is lined with packaging materials; the weight of each box shall not exceed 1 000 kg. Other rods shall be bundled in bare parts.

When oiling is required or when the user has other special requirements for the packaging, it shall be marked on the order form (or contract). Other requirements shall comply with the provisions of GB/T 3199.

6.3 Transportation and storage

The transportation and storage of the rods shall comply with the provisions of GB/T 3199.

6.4 Quality certificate

Each batch of products 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). […]