Question 1: What is the GB/T12771 standard?
The full name of the GB/T12771 standard is "Stainless Steel Welded Steel Pipe for Fluid Transportation". This standard stipulates the relevant requirements for stainless steel welded steel pipes for fluid transportation, and is used to guide the production, inspection and other work of such steel pipes.
Question 2: What is the scope of application of the GB/T12771 standard?
This standard applies to stainless steel welded steel pipes for fluid transportation that transport low-pressure corrosive media.
Question 3: What are the classification methods for stainless steel welded pipes using the GB/T12771 standard?
Classification by welding technology
It can be divided into automatic welding and manual welding. Automatic welding generally uses submerged arc welding and plasma welding, and manual welding generally uses argon arc welding. Usually, the outer diameter below 508mm is automatic welding, and the weld is leveled online, and the outer diameter above 508mm is manual welding. The raw material for automatic welding is steel strip, and the raw material surface is 2B surface; the raw material for manual welding is steel plate, and the raw material surface is pickled surface.
Classification by weld form
It is divided into straight welded pipe and spiral welded pipe. Most of the welded pipes produced according to GB/T12771 standard are straight welded pipes, and a few large pipes will be lengthened with circumferential seams.
Classification by shape
It is divided into round pipes, square pipes, elliptical pipes and special-shaped pipes. The main products are round pipes and square pipes, and most elliptical pipes need to be customized.
Question 4: What are the characteristics of stainless steel welded pipes that meet GB/T12771 standards?
Advantages
Simple production process, high production efficiency, many varieties and specifications, and low equipment investment;
With the rapid development of strip steel continuous rolling production and the advancement of welding and inspection technology, the quality of welds has been continuously improved, the variety and specifications have increased, and the application field has become more and more extensive.
Disadvantages
General strength is lower than seamless steel pipes
Question 5: What are the requirements of GB/T12771 standard for product packaging, marking and transportation?
GB/T12771-2008 puts forward more specific requirements for product packaging methods, identification information and transportation and storage conditions to reduce damage and facilitate identification and traceability.
