The acceptance of straight seam steel pipe is subject to special regulations according to product s

Acceptance 
1.1 The quality inspection and acceptance of straight seam steel pipes shall be carried out by the technical quality supervision department of the supplier. 
1.2 The supplier must ensure that the straight seam steel pipe is delivered in accordance with the relevant product standards. The acquirer has the right to inspect and accept the products according to the corresponding product standards. 
1.3 Straight seam steel pipes shall be submitted for acceptance in batches, and the batch approval rules shall comply with the provisions of the corresponding product standards. 
1.4 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, the hot-rolled seamless straight seam steel pipe can be sampled in batches of the rolling root array. 
1.5 Straight seam steel pipe test results, if one item does not meet the requirements of the product standard, the unqualified person should be selected, and from the same batch of straight seam steel pipe, take double the number of samples to complete the unqualified project. Test. 
If the re-inspection result (including any of the indicators required for the test of the project) is unqualified, the batch of straight seam steel pipes shall not be delivered. 
The following inspection items are not allowed to be retested when the initial test fails: 
a. There are white spots in the low-fold tissue; 
b. Microstructure. 
1.6 Straight seam steel pipes with unqualified retest results (including those whose initial microstructure results are unqualified and are not allowed to be retested), the supplier may submit the inspections one by one; or re-heat treatment (the number of reheat treatments shall not exceed two times) , with a new batch of acceptance. 
1.7 If the product standard is not specified, the chemical composition of the straight seam steel pipe shall be checked and accepted according to the melting composition. 
2 signs
2.1 Straight seam steel pipes with an outer diameter of not less than 36 mm and profiled straight seam steel pipes with a section length of not less than 150 mm shall be printed, stamped, stamped, stamped or pasted at the end of one end of each straight seam steel pipe. The mark should be clear and obvious and not easy to fall off. The stamp shall include the grade of the steel, the product specification, the production standard number and the supplier's mark or registered trademark. Alloy steel straight seam steel pipe shall be printed with the furnace number and batch number after the steel grade. For pipe joints of geological and petroleum straight seam steel pipes, there shall be a grade or steel grade mark. Threaded straight seam steel pipes with left threads shall be marked with the word "Left" after the standard number. Welded straight seam steel pipe for low-pressure fluid transportation and galvanized welded straight seam steel pipe, wire casing, general-purpose welded straight seam steel pipe, profiled section welded straight seam steel pipe, profiled seamless straight seam steel pipe with complex section, not every straight Printed on the seam steel pipe. 
2.2 Straight-slit steel pipes with an outer diameter of less than 36 mm and profiled straight-slit steel pipes with a section length less than 150 mm may not be printed.