Stainless Steel
Austenitic 348/348H

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Specifications (ASTM/ASME)
Alloy UNS Designation Material
Specification
Tubing
Specification
Pipe
Specification
348 S34800 A 240/SA-240 A 249/SA-249 A 312/SA-312
      A 269 ---
348H S34809 A 240/SA-240 A 249/SA-249 A 312/SA-312
Chemical Composition (%)
Alloy 348 348H
UNS Designation S34800 S34809
Carbon (C)  0.08 max. 0.04 - 0.10
Manganese (Mn) max. 2.00 2.00
Phosphorus (P) max. 0.045 0.045
Sulfur (S) max. 0.030 0.030
Silicon (Si) max. 0.75 0.75
Chromium (Cr) 17.0 - 19.0 17.0 - 19.0
Nickel (Ni) 9.0 - 13.0 9.0 - 13.0
Columbium (Cb) plus Tantalum (Ta) 10 x C min., 1.00 max. 8 x C min., 1.00 max.
Tantalum (Ta) max. 0.10 0.10
Cobalt (Co) max. 0.20 0.20
Iron (Fe) Balance Balance
Typical Physical & Mechanical Properties - Annealed Condition (Room Temperature)
Alloy UNS Designation Minimum Tensile Strength
Minimum Yield
Strength
0.2% Offset
Minimum Percent (%)
Elongation in
2 inches (50.8 mm)
(psi) (MPa) (psi) (MPa)
348 S34800 75,000 515 30,000 205 35
348H S34809 75,000 515 30,000 205 35

 

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