StacksVerified U.S. federal law reference

49 CFR §179.100-10 — -10 Postweld heat treatment.

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (a)After welding is complete, steel tanks and all attachments welded thereto must be postweld heat treated as a unit in compliance with the requirements of AAR Specifications for Tank Cars, appendix W (IBR, see § 171.7 of this subchapter).
  2. (b)For aluminum tanks, postweld heat treatment is prohibited.
  3. (c)Tank and welded attachments, fabricated from ASTM A 240/A 240M (IBR, see § 171.7 of this subchapter), Type 304L or Type 316L materials do not require postweld heat treatment, but these materials do require a corrosion resistance test as specified in § 179.100-7(c)(2).