Acceptance Of Straight-seam Steel Pipes

The quality inspection and acceptance of straight-seam steel pipes shall be carried out by the technical quality supervision department of the supplier. The supplier must ensure that the delivery of straight-seam steel pipes meets the requirements of the corresponding product standards. The buyer has the right to inspect and accept the products according to the corresponding product standards. Straight seam steel pipes shall be submitted for acceptance in batches, and the batching rules shall comply with the provisions of the corresponding product standards. The inspection items, sampling quantity, sampling location, and test method of straight seam steel pipe shall be in accordance with the provisions of the corresponding product standards.

With the consent of the purchaser, hot-rolled seamless straight seam steel pipes can be sampled in batches according to the number of rolling roots. In the test results of straight seam steel pipes, if a certain item does not meet the requirements of the product standard, the unqualified ones should be picked out, and double the number of samples should be randomly taken from the same batch of straight seam steel pipes for re-inspection of unqualified items.

If the re-inspection result (including any index required by the project test) is unqualified, the batch of straight seam steel pipes shall not be delivered.

For the following inspection items, if the preliminary inspection fails, re-inspection is not allowed:

a. There are white spots in the low-power tissue;

b. Microstructure.

For straight seam steel pipes with unqualified re-inspection results (including unqualified microstructure in the preliminary inspection results, items that are not allowed to be re-inspected), the supplier can submit them for acceptance one by one; Propose acceptance with a new batch. If there is no special regulation in the product standard, the chemical composition of the straight seam steel pipe shall be checked and accepted according to the melting composition.