What is an ASTM A358 pipe?
ASTM standards, laid down by the American Society for Testing and Materials, ensure that the piping complies with the required norms. It helps ensure safety, quality, and fitment to different applications. The ASTM A358 specification covers piping produced by electric fusion welding. It includes materials like chromium-nickel alloys and stainless steel.
An ASTM A358 pipe caters to high-temperature applications as well as routine uses. It lays out five classes of piping from 1 to 5.
The requirement also extends to the necessary testing. The piping must pass a transverse tension test, a hydrostatic test, and a guided-bend weld test.
ASTM A358 specification
ASTM A358 Class 1 and A358m welded pipe suppliers in UAE
What is ASTM A358m?
It is another name for the A358 standard. This specification caters to stainless steel piping for household applications and high-temperature settings.
You can use an ASTM A358 stainless steel EFW pipe for your application to guarantee its quality and performance in variable operating environments.
Besides laying down the classes and the required tests for the piping, the specification also lists the required heat treatment. While procuring products complying with this standard, you must specify if you don’t need the recommended heat treatment. For example, an ASTM A358 EFW Pipe undergoes a solution anneal and a stabilization treatment if the chemical properties get affected.
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Difference between ASTM A358 Class 1, 2, 3, 4 and 5
This standard categorizes piping into five classes based on the welding technique and the requirement for radiography. In ASTM A358 Class 1, the pipes get double-welded via a filler metal. They must get radiographed.
Class 2 requires double-welding with filler as well. But an ASTM A358 Class 2 EFW Welded Pipe does not mandate radiography.
Classes 3 and 4 cater to single-welded pipes. In Class 4, the weld pass in the inner surface does not require filler. It differs from an ASTM A358 Class 3 hfw pipe in this regard. Finally, Class 5 requires double-welding with filler and also needs spot radiography. Whichever class you choose, the manufacturer must also cater to weld defects and conduct heat treatment as required.
SA358 pipe and ASTM A358 Class 2 EFW welded pipe are used in high-temperature & corrosive conditions
ASTM A358 vs A312
The ASTM A312 standard caters to materials that get produced seamlessly without welding. It does not have any sub-classes. You can procure these pipes in sizes up to 30 inches.
However, ASTM A358 refers to piping that requires fusion welding (single-welded or double-welded). It encompasses five classes from 1 to 5 based on the type of welding, filler requirement, and radiography needs. For example, an ASTM A358 cl1 requires radiography. These pipes are usually cheaper. You can order them in sizes up to 48″.
The parent requirements for A312 lie in specification A999. In contrast, the criteria for an A358 EFW electric fusion welded pipe stem from specification A240.
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Features & benefits of A358 material
When you choose a material conforming to this standard, you get assured of its quality. An SA358 pipe undergoes several tests, including a transverse tension analysis and hydrostatic tests. The manufacturer must repair any imperfections and conduct the appropriate heat treatment.
A358 components are stable, durable, and machinable. Another benefit of picking an A358 pipe is the diverse range of welding techniques available. For example, you can use single-welded piping or a double-welded one with or without filler. Procuring and using compliant material is also a straightforward way to achieve compatibility across brands and avoid issues in quality and performance.
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Applications of an ASTM A358 stainless steel EFW pipe
Reliability and high performance make these pipes suitable for several industries, like food and beverages, nuclear sectors, construction, and petrochemicals. The thermal properties of A358 material also make it ideal for boilers and condensers. The petroleum sector also employs these components in high-temperature settings.
This piping can deliver long service life and low maintenance costs. It is also weather-proof and corrosion-resistant in the presence of abrasive media. You can choose piping of the appropriate class from 1 to 5 depending on your specific welding needs, for instance, an ASTM A358m Welded Pipe.