{"data":{"id":"us/49-cfr-appendix-a-to-part-178","jurisdiction":"us","citation":"49 CFR Appendix A to Part 178","heading":"Appendix A to Part 178—Specifications for Steel","body":"Table 1\n[Open-hearth, basic oxygen, or electric steel of uniform quality. The following chemical composition limits are based on ladle analysis:]\nDesignation Chemical composition, percent-ladle analysis\nGrade 1 1 Grade 2 1 2 Grade 3 2 4 5\nCarbon 0.10/0.20 0.24 maximum 0.22 maximum.\nManganese 1.10/1.60 0.50/1.00 1.25 maximum.\nPhosphorus, maximum 0.04 0.04 0.045.6\nSulfur, maximum 0.05 0.05 0.05.\nSilicon 0.15/0.30 0.30 maximum\nCopper, maximum 0.40\nColumbium 0.01/0.04\nHeat treatment authorized (3) (3) (3).\nMaximum stress (p.s.i.) 35,000 35,000 35,000.\n1 Addition of other elements to obtain alloying effect is not authorized.\n2 Ferritic grain size 6 or finer according to ASTM E 112-96 (IBR, see § 171.7 of this subchapter).\n3 Any suitable heat treatment in excess of 1,100 °F., except that liquid quenching is not permitted.\n4 Other alloying elements may be added and shall be reported.\n5 For compositions with a maximum carbon content of 0.15 percent of ladle analysis, the maximum limit for manganese on ladle analysis may be 1.40 percent.\n6 Rephosphorized Grade 3 steels containing no more than 0.15 percent phosphorus are permitted if carbon content does not exceed 0.15 percent and manganese does not exceed 1 percent.\nCheck Analysis Tolerances\n[A heat of steel made under any of the above grades, the ladle analysis of which is slightly out of the specified range is acceptable if the check analysis is within the following variations:]\nElement Limit or maximum specified (percent) Tolerance (percent) over the maximum limit or under the minimum limit\nUnder minimum limit Over maximum limit\nCarbon To 0.15 inclusive 0.02 0.03\nOver 0.15 to 0.40 inclusive 0.03 0.04\nManganese To 0.60 inclusive 0.03 0.03\nOver 0.60 to 1.15 inclusive 0.04 0.04\nOver 1.15 to 2.50 inclusive 0.05 0.05\nPhosphorus 7 All ranges 0.01\nSulfur All ranges 0.01\nSilicon To 0.30 inclusive 0.02 0.03\nOver 0.30 to 1.00 inclusive 0.05 0.05\nCopper To 1.00 inclusive 0.03 0.03\nOver 1.00 to 2.00 inclusive 0.05 0.05\nNickel To 1.00 inclusive 0.03 0.03\nOver 1.00 to 2.00 inclusive 0.05 0.05\nChromium To 0.90 inclusive 0.03 0.03\nOver 0.90 to 2.10 inclusive 0.05 0.05\nMolybdenum To 0.20 inclusive 0.01 0.01\nOver 0.20 to 0.40 inclusive 0.02 0.02\nZirconium All ranges 0.01 0.05\nColumbium To 0.04 inclusive 0.005 0.01\nAluminum Over 0.10 to 0.20 inclusive 0.04 0.04\nOver 0.20 to 0.30 inclusive 0.05 0.05\n7 Rephosphorized steels not subject to check analysis for phosphorus.","path":["Title 49—Transportation","Subtitle B—Other Regulations Relating to Transportation","CHAPTER I—PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION","SUBCHAPTER C—HAZARDOUS MATERIALS REGULATIONS","PART 178—SPECIFICATIONS FOR PACKAGINGS"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-49.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:34Z","sha256":"dcb1a64dc04160082fef02cd665e69335c57327964a34eb034ca8b1b141a47ff","source_id":"us-cfr","stale":true,"prev":"us/49-cfr-178.1070","next":"us/49-cfr-appendix-b-to-part-178"},"notice":"GroundRules: Original legal text. Not legal advice."}