Chemical Requirements Austenitic Stainless Steels used in Piping applications

ASTM A182
Specification for Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Forged Fittings, and Valves and Parts for High-Temperature Service

Notes:

  1. Grades F304, F304L, F316, and F316L shall have a maximum Nitrogen content of 0.10%.
  2. Grades F304N, F316N, F304LN, and F316LN shall have a Nitrogen content of 0.10 to 0.16%.
  3. Grade F316Ti shall have a Titanium content not less than five times the Carbon plus Nitrogen content and not more than 0.70%.
  4. Grade F321 shall have a Titanium content of not less than five times the Carbon content and not more than 0.70%.
  5. Grade F321H shall have a Titanium content of not less than four times the Carbon content and not more than 0.70%.
  6. Grades F347 and F348 shall have a Niobium content of not less than ten times the Carbon content and not more than 1.10%.
  7. Grades F347H and F348H shall have a Niobium content of not less than eight times the Carbon content and not more than 1.10%.

ASTM A312
Specification for Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes

Notes:

  1. New designation established in accordance with Practice E 527 and SAE J1086.
  2. Maximum, unless otherwise indicated. Where elipses (...) appear in this table, there is no requirement and analysis for the element need not be determined or reported.
  3. The method of analysis for Nitrogen shall be a matter of agreement between the purchaser and manufacturer.
  4. For small diameter or thin walls or both, where many drawing passes are required, a Carbon maximum of 0.040% is necessary in grades TP304L and TP316L. Small outside diameter tubes are defined as those less than 0.50 in. [12.7 mm] in outside diameter and light wall tubes as those less than 0.049 in. [1.20 mm] in average wall thickness (0.044 in. [1.10 mm] in minimum wall thickness).
  5. For welded TP316, TP316N, TP316LN, and TP316H pipe, the Nickel range shall be 10.0-14.0%.
  6. For welded pipe, the Phosphorus maximum shall be 0.045%.
  7. The Titanium content shall be not less than five times the Carbon content and not more than 0.70%.
  8. The Titanium content shall be not less than four times the Carbon content and not more than 0.60%.
  9. The Niobium content shall be not less than ten times the Carbon content and not more than 1.0%.
  10. The Niobium content shall be not less than eight times the Carbon content and not more than 1.0%.
  11. Grade S34751 shall have a Niobium plus Tantalum content of not less than 15 times the Carbon content.

ASTM A351
Specification for Castings, Austenitic, for Pressure-Containing Parts

Notes:

  1. Grade CF8C shall have a Niobium content of not less than 8 times the Carbon content but not over 1.00%.
  2. Grade CF10MC shall have a Niobium content of not less than 10 times the Carbon content butnot over 1.20%.

ASTM A403
Specification for Wrought Austenitic Stainless Steel Piping Fittings

Notes:

  1. Maximum, unless otherwise indicated.
  2. The method of analysis for Nitrogen shall be a matter of agreement between the purchaser and manufacturer.
  3. Niobium 0.10-0.30%; Vanadium, 0.10-0.30%.
  4. For small diameter or thin walls, or both, where many drawing passes are required, a Carbon maximum of 0.040% is necessary in grades TP304L and TP316L. Small outside diameter tubes are defined as those less than 0.50 in. [12.7 mm] in outside diameter and light wall tubes as those less than 0.049 in. [1.24 mm] in average wall thickness.
  5. On pierced tubing, the Nickel may be 11.0-16.0%.
  6. 5X(C+N2)-0.70.
  7. 4X(C+N2)-0.70.
  8. The Niobium content shall be not less than ten times the Carbon content and not more than 1.10%.
  9. The Niobium content shall be not less than eight times the Carbon content and not more than 1.10%.

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