ASTM A790 is the American Society for Testing and Materials' "Standard Specification for Seamless and Welded Ferritic/Austenitic Stainless Steel Pipe". It defines the composition and mechanical property requirements for seamless and straight seam-welded pipe.
It also covers heat treatment, manufacturing process, sampling and testing, and product marking. Pipe additionally requires hydrostatic or non-destructive electric testing - Eddy Current or Ultrasonic Testing (UT) - to confirm product integrity.
How A790 pipe is made and tested
A790 pipe is made seamless or by an automatic welding process without the addition of filler metal. Heat analysis determines the percentages of the specified elements. To conform, the pipe undergoes tension, hardening, flattening, hydrostatic and non-destructive electric tests.
Applications
The high strength and corrosion resistance of duplex stainless steels suit A790 pipe and tube to harsh environments, including chloride and sulphide service:
- Marine environments
- Pollution control equipment
- Oil and gas refining
- Pulp and paper manufacturing
- Oil and gas exploration and offshore rigs
- Chemical process plant
- Chemical processing, transport and storage
Grades we supply under A790
We supply a wide range of duplex and super duplex stainless steels covered by A790, including:
- UNS S31803 (Duplex 2205, 1.4462, F51)
- UNS S32205 (Duplex 2205, 1.4462, F60)
- UNS S32750 (2507, 1.4410, F53)
- UNS S32760 (Zeron 100®, 1.4501, F55)
- UNS S32550 (Ferralium® 255, 1.4507, F61)