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ASTM A789

Duplex 2205 and Super Duplex Seamless Welded Tube

ASTM A789 Standards And Specifications

The ASTM A789 covers ferritic austenitic stainless steel seamless welded tube for high temperature service like water heaters. .

ASTM A789 - Seamless Tube and Welded Tube

ASTM A789 Tube

ASTM A789 is ferritic-austenitic stainless steel with good abrasion and erosion resistance. These duplex tubes have have wall thickness of 0.08mm-15mm with outer diameter 0.3mm-10mm in hardness form as soft, hard, half hard, etc.

Scope And Manufacturing

ASTM A789 specification covers seamless tube and welded tube of duplex and super duplex (UNS S32205, UNS S31803, UNS S32760, UNS S32750)stainless steel. These Duplex steel tube are more prone to precipitation of sigma phase, nitrides and carbides than corresponding austenitic steels, causing embrittlement and reduced corrosion resistance. The formation of intermetallic phases such as sigma phase occurs in the temperature range 600-1000°C and decomposition of ferrite occurs in the range 350-500°C (475°C embrittlement). The high tensile strength of duplex steel tube also implies high fatigue strength. Due to their high chromium content, duplex steels offer excellent corrosion resistance in many media.

Siddhagiri Metals and Tubes offers grades such as Duplex 2205 Welded Tube, Super Duplex 2760 Welded Tube, which are used in firewalls and blast walls on offshore platforms, bridges, etc. Super Duplex 2750 Seamless Tube, Duplex 1803 Seamless Tube have high energy absorption and low thermal expansion is also exported by us. We provide all sizes as per client requirement and need.


ASTM A789 is a specification is for Duplex and Super Duplex Stainless Steel Seamless Welded Tubes. Siddhagiri Metals and Tubes is specialized in ASTM A789 UNS S31803, ASTM A789 UNS S32205, ASTM A789 UNS S32750, ASTM A789 UNS S32760.
Other Names : ASTM A789 UNS S31803, ASTM A789 UNS S32205, ASTM A789 UNS S32750, ASTM A789 UNS S32760, Duplex 2205 Seamless Welded Tube, Super Duplex 2507 Seamless Welded Tube, Super Duplex 4501 Seamless Welded Tube.
Material : Duplex 2205, Super Duplex 2507, Super Duplex 4501
Brand : Siddhagiri Metals and Tubes
Manufacturer : Siddhagiri Metals and Tubes
Rating : 4.5/5 based on 70 customer reviews

Our Inventory of ASTM A789 Material

  • ASTM A789 UNS S31803
  • ASTM A789 UNS S32205
  • ASTM A789 UNS S32760
  • ASTM A789 UNS S32750