GB/T 8769-2010Zirconium and zirconium alloy bars and wires (English PDF)

3.1 Classification of products

3.1.1 Designation, state and specification

The designation, state and specification of the bars and wires shall comply with the provisions of Table 1 specimens shall be corroded for 72 h or 336 h in water vapor at 400°C ± 5 °C, and 10.3 +0.7 -0.5 MPa.

3.6 Microstructure and macrostructure

3.6.1 Wires and bars with a diameter or side length greater than 3 mm are not allowed to have cracks, folds, pores, segregation, tail shrinkage, metallic or non-metallic inclusions, and other visible metallurgical defects at the horizontal macrostructure.

3.6.2 When required by the purchaser and specified in the contract, the bar can be inspected by microstructure, and the acceptance index shall be negotiated and determined by the supplier and the purchaser.

3.7 Ultrasonic inspection

When required by the purchaser and specified in the contract, the turning (grounding) bars can be subjected to ultrasonic inspection, and the acceptance index shall be negotiated and determined by the supplier and the purchaser.

3.8 Appearance quality

3.8.1 Wire

3.8.1.1 The wire is generally straight wire with cold-working or alkali pickling surface, and a diameter of no less than 2.0 mm. Grounding surface can be supplied when required by the buyer and specified in the contract.

3.8.1.2 The surface of the wire shall be clean, and no cracks, peeling, thorns and inclusions are allowed.

3.8.1.3 The wire is allowed to have slight local scratches, abrasions, spots and pits that do not exceed the allowable deviation of the wire.

3.8.2 Bar

3.8.2.1 The surface roughness Ralpha of the turning (grounding) bar that requires ultrasonic flaw detection in the contract shall be no greater than 3.2µm (to meet the flaw detection requirements).

3.8.2.2 The surface of the bar shall be clean and free of foreign objects. The surface shall not be allowed to have transverse cracks and longitudinal splits. Scratches, indentations and pits with a depth not exceeding half of the allowable deviation of the size are allowed. Local defects are allowed to be removed, and the depth of removal shall be no greater than the allowable deviation of its size, and the ratio of width to depth of the removed part shall be greater than 6.

5.1 Inspection and acceptance

5.1.1 The product shall be inspected by the supplier's quality inspection department to ensure that the quality of the product comply with the provisions of this Standard and the contract (or purchase order); and the quality certificate shall be filled in.

5.1.2 The purchaser shall re-inspect the received product in accordance with the provisions of this Standard. If the re-inspection result does not conform to the provisions of this Standard and the contract (or purchase order), it shall be submitted to the supplier in written form; and both parties shall solve through negotiation.

Objections related to surface quality and dimensional deviations shall be submitted within one month from the date of receipt of the product. Objections related to other

5.5 Judgment of inspection results

5.5.1 If the chemical composition of the product is disqualified, the batch of products shall be deemed disqualified.

5.5.2 When the product size, allowable deviation, and appearance quality are disqualified, a single piece (reel, roll) is judged to be disqualified. However, the supplier is allowed to remove the disqualified part and re-inspect, and the qualified one shall deliver the goods.

5.5.3 When a specimen is disqualified in the mechanical performance test result, another double number of samples shall be taken from the batch of bars (including the disqualified bars in the original inspection) to repeat the test for the disqualified item. If there are still disqualified inspection results, the whole batch of bars shall be deemed disqualified. However, the supplier is allowed to inspect the remaining bars one by one, and the qualified ones shall be re-batched for delivery. The product can also be re-sampled for inspection after re-heat treatment.

5.5.4 When there are cracks, non-metallic inclusions and shrinkage in the macrostructure specimen, the supplier is allowed to inspect one by one to remove the defective products and deliver the qualified products.

5.5.5 When the corrosion performance and microstructure are disqualified, the supplier and the purchaser shall negotiate and resolve.

5.5.6 When the ultrasonic flaw detection is disqualified, the bar shall be judged as disqualified.

6.1 Marking

Labels or tags should be attached to the products that have passed the inspection, and the marking contents on which shall be as follows:

a) The name of the manufacturer;

b) Product designation, status and specification;

c) Product batch number or smelting furnace number.

6.2 Packaging, transportation and storage

The packaging, transportation and storage of the product shall refer to the provisions […]