What is the difference between expanded tubes and ordinary seamless tubes?
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When purchasing seamless pipes, the supplier often recommends expanded pipes. I’m not sure whether these expanded pipes meet relevant national or American standards, and what the differences are between them and ordinary seamless pipes.
I haven’t seen a steel pipe factory; I’ve only seen tube drawing and rolling processes. I’ve seen tube expansion done in small factories, but I’m not sure whether such tube expansion is legal. I hope someone knowledgeable can clarify this for me
The diameter of the pipes you purchase should be 457mm or 508mm or more. The reason for recommending expanded pipes is that they can be produced in small batches, with fast delivery times, lower costs, and greater flexibility.
The national standards specify the production processes for thermally expanded steel pipes, as well as the corresponding size standards. Of course, when the final products are delivered, all relevant standard tests must meet the requirements specified in the purchase contract.
The national standards specify the production processes for thermally expanded steel pipes, as well as the corresponding size standards. Of course, when the final products are delivered, all relevant standard tests must meet the requirements specified in the purchase contract.
Difference between expanded tubes and seamless tubes: First, there are two types of expanded tubes – heat-expanded seamless tubes and heat-expanded high-frequency welded tubes； Second, in the case of the first type, when the delivery conditions are met, that is, when the corresponding delivery standard criteria are satisfied, the difference between it and seamless pipes lies in the manufacturing process. Third, if it is the latter case, then it is not a seamless tube to begin with; it is a product that, after being manufactured, does not appear to be a welded tube. The difference between it and a seamless tube is that it is an imitation seamless tube product that is cheaper than genuine seamless tubes. :)
This post was last edited by wanlirn on 2016-11-25 at 19:25. The inside of the pipe is very deep; old pipes can be used and modified in terms of specifications. We have pipes here whose wall thickness can be increased from 8mm to 10mm. It’s hard to believe unless you see it with your own eyes. Three processing steps are required. It’s possible to expand welded pipes so that they appear to be seamless pipes. My current workplace doesn’t require pipe expansion – 90% of the pipes available are fake, along with fake quality certificates