Seeking advice on steel pipe issues
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I work in the manufacturing field and don’t know much about piping. On the construction diagrams I’ve seen, some of the steel pipes are labeled as seamless steel; there’s also EFW steel (which, after asking, turns out to be electric fusion-welded straight-seam steel). Of course, there are many other types of steel pipes that I haven’t seen before. I’d like to ask about the differences between these steel pipes – such as how they’re manufactured, their areas of application, why certain types are used, their prices, strength, and so on. If my questions seem stupid, please don’t laugh at me :L Pro here, just saying:victory:
To be honest, the knowledge the original poster needs cannot be explained in just a few words; it requires you to acquire it gradually on your own. Additionally, there is a lot of scattered relevant knowledge in HCBBS, and you need to put in some effort to learn it*.
Indeed, after all, I haven’t studied this area in depth; I don’t want to go too far into it – a basic understanding is sufficient. Could some expert explain it in simple terms? :lol
Generally, the pressure rating of seamless steel pipes is 2.5 MPa or higher (it’s easy to understand that seamless pipes, which are produced by direct rolling, can withstand higher internal pressures), while welded pipes have lower strength due to the welds present; they are made by rolling sheet metal and then welding it together, and their pressure rating is usually 2.5 MPa or less. Among them, seam welded pipes are divided into straight-seam welding and spiral welding. Due to manufacturing processes, for pipes of the same pressure rating, seamless pipes are more expensive than welded pipes.
Thank you for your answer. Straight seam welding is easy to understand – when the steel plate is rolled up, it should form a straight line. I’m not sure what thread welding entails Could you give an explanation?
Threaded welding involves rolling steel plates in a spiral direction, resulting in what is known as spiral welded pipes; you can refer to SY/T 5037 for detailed explanations on this topic