GB/T 33823-2017Aluminum alloy die forgings for control arms of passenger vehicles (English PDF)

4.7 Microstructure

The microstructure is not allowed to over-burn.

4.8 Appearance quality

4.8.1 A slight bump, scratches, pressure pit, scratches and other defects are allowed.

4.8.2 The forging on the forging surface is not allowed to repair; or material shortage, peelings, bubbles, cracks, layers, stacks and other defects are not allowed.

4.9 Banned substance

The forging shall meet requirements for automobile banned substances specified in GB/T 30512.

5.1 Chemical composition

The analysis method for chemical composition shall comply with GB/T 20975 or GB/T 7999. The arbitration analysis shall use the method specified in GB/T 20975.

5.2 Size deviation

The measurement of size deviation of the forging shall comply with GB/T 8545-2012.

5.3 Mechanical properties

The test method for tensile mechanical properties at room temperature shall comply with GB/T 16865.

5.4 Brinell hardness

The test method for Brinell hardness shall comply with GB/T 231.1.

5.5 Macrostructure

The test method for macrostructure shall comply with GB/T 3246.2.

5.6 Microstructure

The test method for microstructure shall comply with GB/T 3246.1.

5.7 Appearance quality

Appearance quality is visually inspected under natural scattered light. The fluorescence penetration test shall be carried out according to GB/T 18851.

5.8 Banned substance

The test method for banned substance shall be carried out according to GB/T 30512.

6.1 Inspection and acceptance

6.1.1 The forging shall be inspected by the supplier to ensure that the product quality in line with this Standard and the order (or contract) requirements. Fill in the quality certificate.

6.1.2 The purchaser shall inspect the product received in accordance with the provisions of this Standard. When the inspection results do not comply with this Standard and the order (or contract), it shall be put forward in written form by the supplier and solved by the supplier and the purchaser via negotiation. The objection to the appearance quality and size deviation shall be put forward within one month from the date of receipt of the product. Any objection to other performance shall be put forward within 3 months from the date of receipt of the product. For arbitration, it may entrust an organization approved by the supplier and the purchaser. The sampling shall be carried out by the supplier and the purchaser at the purchaser's.

6.2 Batch

The forging shall be submitted in batch for acceptance. Each batch shall consist of the products of same designation, status and same thermal treatment furnace number. The number of each batch shall be confirmed by the supplier.

6.3 Metering

7.1 Mark

7.1.1 The packaging box mark of the forging shall comply with GB/T 3199.

7.1.2 On the qualified die forging, it shall print the following marks or labels.

a) alloy designation and supply status;

b) thermal treatment number;

c) product's mark;

d) batch number or date of production;

e) the inspection seal of supplier's quality inspection department or signature (or seal) of the inspector.

7.2 Packaging

The product's packaging shall comply with GB/T 3199. Particular requirements shall be confirmed by the supplier and the purchaser via negotiation and indicated in the order (or contract).

7.3 Transport and storage

The product's transport and storage shall comply with GB/T 3199.

7.4 Quality certificate

Each batch of products shall be attached with product quality certificates, indicating.

a) supplier's name;

b) product's name;

c) designation and status;

d) furnace number, batch number, thermal treatment number and date of manufacture;

e) weight or number of pieces;

f) analysis inspection results of each item; […]