Carbon Steel Pipe Acceptance Rules

1. Carbon steel pipe quality inspection and acceptance by the supplier technical quality supervision department
2. The supplier must ensure that the delivery of steel pipe in accordance with the provisions of the corresponding product standards. The purchaser shall have the right to inspect and inspect the product according to the relevant product standards
3. Carbon steel pipe should be submitted in bulk acceptance, the group approved the rules should be consistent with the provisions of the corresponding product standards.
4. Carbon  steel pipe inspection items, sampling number, sampling sites and test methods, according to the provisions of the corresponding product standards. The consent of the demand side, hot-rolled seamless steel tube can be sampled by rolling the root array.
5. Carbon steel pipe test results, a non-compliance with product standards, should be unqualified singled out, and from the same batch of steel pipe, either take double the number of samples for failure of the project re-test .

If the result of the re-inspection (including any one of the requirements of the test) is unqualified, the pipe shall not be delivered.
The following test items, initial inspection failed, do not allow re-inspection:
A. White spots in low magnification tissue.
B. Microstructure.

6. The re-inspection results are unqualified (including the initial test results of microstructure failure, does not allow re-inspection of the project) of the pipe, the supplier can be submitted to the acceptance by the root; or re-heat treatment (re-heat treatment shall not exceed twice) To the latest batch of acceptance.
7. If the product standards are not specified, the chemical composition of mild steel pipe smelting components for acceptance.