The following straight seam steel pipe inspection items are not allowed to be re-inspected when they

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The following straight seam steel pipe inspection items are not allowed to be re-inspected when they

1) There are white spots in the low power organization.

2) Micro-structure.

For straight seam steel tubes with unqualified retest results (including unqualified micro-structures and items that are not allowed to be retested), the supplier may submit acceptances one by one; or re-heat treatment (the number of re-heat treatments shall not exceed two times). Proceed with a new batch for acceptance.

If no special provisions are made in the product standard, the chemical composition of the straight seam steel pipe shall be accepted according to the smelting composition.