Spiral welded steel pipe wall thickness deviation range: Currently, spiral steel welded pipe manufacturers have two settlement methods when selling spiral steel pipes: one is to settle based on the theoretical weight of the gauge, and the other is to settle based on the actual weighing weight. Therefore, when purchasing, we must figure out how to purchase based on the settlement method, rather than just looking at the price of spiral steel pipes.
Standard wall thickness deviation range: The deviation range required by standard spiral steel pipes (ISO 3183:2012) with a wall thickness of less than 5mm is 0.5mm up and down. For wall thickness above 5mm (that is to say, for steel pipes with wall thickness less than or equal to 5mm, the wall thickness deviation cannot exceed 0.5mm). For spiral steel pipes below 15mm, the required deviation range is 10% of the wall thickness of the steel pipe (that is to say, for steel pipes with wall thickness greater than 5mm) , less than 15mm, the wall thickness deviation cannot exceed 10% of the wall thickness).
Steel pipe wall thickness above 15mm is regulated by plus or minus 1.5mm. Actual deviation range of spiral welded steel pipe wall thickness: Currently, all spiral steel pipes sold by spiral steel pipe manufacturers are divided into theoretical weight delivery and weight delivery.
The theoretical weight of the delivered wall thickness standard is basically a lower deviation, but will not exceed the standard range, so it is necessary to inquire about the actual wall thickness when purchasing. For example, a 630*10 spiral steel pipe can be manufactured with 11mm and 9mm steel strips, and the manufactured spiral welded steel pipe can be delivered with a thickness of 10mm.
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