ASTM A790 UNS S31803/SAF 2205 DUPLEX STAINLESS STEEL THICK WALL PIPE INDUSTRY APPLICATION

ASTM A790/A790M-22 Standard Specification for Seamless and Welded Ferritic /Austenitic Stainless Steel Pipe. The specification covers seamless and straight-seam welded ferritic/austenitic steel pipe for general corrosive service, with particular emphasis on resistance to stress corrosion cracking. The pipe shall be made by the seamless or an automatic welding process, with no addition of filler metal in the welding operation. Heat analysis shall be made to determine the percentages of the elements specified. Tension tests, hardening tests, flattening tests, hydrostatic tests and nondestructive electric tests shall be made to conform to the specified requirements.

ASTM A790 UNS S31803 is a specification in duplex steel material. The material is an alloy of steel with chromium and molybdenum in it. The addition of these materials makes the pipes stronger and much corrosion resistant. The SA 790 UNS S31803 one of the super duplex grades which is stronger and corrosion resistant. The duplex grades are divided into three groups as duplex, lean and super duplex. The super duplex is used for specific applications that operate under elevated temperatures. The Duplex UNS S31803 Pipes also possesses an elevated strength due to the production nature. The material could be hot rolled and welded or be cold drawn. The cold drawn pipes are seamless and have less absolute roughness which makes them precise in dimensions. The hot rolled and Welded A928 UNS S31803 material on the other hand is much stronger and could be used with welding applications. The ease of welding in the ASTM A790 UNS S31803 Tube makes it a choice for high pressure applications that will require extensive welding at installation.

The SA790 UNS S31803 Tubing is also highly corrosion resistant in sea water and other chloride ion rich environments. This chloride ion corrosion stress cracking resistance makes it one of the best cost effective solutions in the long run. The Duplex 31803 Seamless Pipes are used in high sensitive applications where the measurements need to be accurate. But the seamless nature reduces strength compared to the Duplex UNS S31803 Welded Pipes. The applications of A790 GR S31803 DSS ERW Pipes could be seen in sea water and marine environments, chemical industries, food processing plants, heat generators, automobile components, parts of boilers and other high temperature applications. The electric fusion welded Duplex S31803 UNS EFW Pipes can also be used interchangeably with less specific application requirements.

Stainless steel alloy grades such as UNS S31803 prove to be particularly useful in applications that are susceptible to stress related corrosion cracking. SCC or stress related corrosion cracking in pipes can have harmful effects on not only the workers in the factory but also to the business itself. Since ASTM A790 UNS S31803 Duplex Steel Seamless Pipe is resistant to SCC, the piping system becomes durable and it has longevity in comparison to conventional steels.

Besides having superior resistance to SCC, the ASME SA 790 UNS S31803 Pipe has improved mechanical characteristics like higher yield strength, which incidentally is almost twice that of a traditional austenitic stainless steel alloy. Pipes under specification ASTM A790, are produced either in a seamless manner or they have a welded construction. The automatic welding process used to weld the ASTM A790 Pipe is to be done without the use of any filler metal. The specification also calls for determining the percentage of elements used to alloy both ASTM A790 Grade UNS S31803 Welded Pipe and seamlessly constructed ones as well. Testing is also an important parameter of these pipes. In addition to a nondestructive electric test, the ASTM A790 UNS S31803 Seamless Pipe is required to conform to the values of tension test, flattening tests, hydrostatic tests as well as a hardening test. Perfect impex is a large manufacturer and supplier of these pipes and we produce all kinds and variations of the product. The advantage to choose ASTM A790 Grade UNS S31803 Pipe manufacturer is to get 5 to 10% discount price compare to stockist and supplier in Mumbai and Prime quality material with Mill test Certificate.

Specification 

Chemical Composition

Physical Properties

Duplex Stainless Steel Pipe Application

• 1. Chemical processing, Transport and Storage.

• 2. Oil and gas exploration and offshore rigs.

• 3. Oil and gas refining.

• 4. Marine environments.

• 5. Pollution control equipment.

• 6. Pulp and paper manufacturing

• 7. Chemical process Plant