ASTM A 789 Seamless and Welded Ferritic/Austenitic Stainless Steel Tubing for General Service
This specification covers grades of average wall thickness, or, if specified on the order, minimum wall thickness, of stainless steel tubing for services requiring general corrosion resistance, with particular emphasis on resistance to stress corrosion cracking. These steels are susceptible to embrittlement if used for prolonged periods at elevated temperatures.
UNS number: S32750 (Ferritic/Austenitic steel)
Orders for product under this specification should in-clude the following, as required, to describe the desired material adequately:
1 Quantity (feet, metres, or number of lengths),
2 Name of product (seamless or welded tubes),
4 Size (outside diameter and average wall thickness, unless minimum wall thickness is specified),
5 Length (specific or random),
6 Optional requirements,
7 Test report required (see the Inspection section of Specification A1016/A1016M),
8 Specification designation, and
9 Special requirements.
The tubes shall be made by the seamless or welded process with no filler metal added.
Quench: rapid cooling in air or water
Chemical requirements, %,
Tensile Strength: ≥800MPa
Yield Strength.: ≥550MPa
Elongation in 2 in. or 50 mm, %: ≥15
Each tube shall be subjected to the nondestructive electric test or the hydrostatic test.
Permissible Variations in Dimensions
|Size, OutsideDiameter, mm||Permissible Variationsin Outside Diameter, mm||Average WallPermissible Variationsin Wall Thickness, %|