[Code of Federal Regulations] [Title 49, Volume 2] [Revised as of October 1, 2005] From the U.S. Government Printing Office via GPO Access [CITE: 49CFR179.100-7] [Page 1037-1038] TITLE 49--TRANSPORTATION CHAPTER I--PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION PART 179_SPECIFICATIONS FOR TANK CARS--Table of Contents Subpart C_Specifications for Pressure Tank Car Tanks (Classes DOT-105, 109, 112, 114 and 120) Sec. 179.100-7 Materials. (a) Steel plate: Steel plate materials used to fabricate tank shell and manway nozzle must comply with one of the following specifications with the indicated minimum tensile strength and elongation in the welded condition. The maximum allowable carbon content must be 0.31 percent when the individual specification allows carbon greater than this amount. The plates may be clad with other approved materials. ------------------------------------------------------------------------ Minimum elongation in 2 Minimum tensile inches Specifications strength (percent) (p.s.i.) welded welded condition\1\ condition (longitudinal) ------------------------------------------------------------------------ AAR TC 128, Gr. B..................... 81,000 19 ASTM A 302 \2\, Gr.B.................. 80,000 20 ASTM A 516 \2\........................ 70,000 20 ASTM A 537 \2\, Class 1............... 70,000 23 ------------------------------------------------------------------------ \1\ Maximum stresses to be used in calculations. \2\ These specifications are incorporated by reference (IBR, see Sec. 171.7 of this subchapter). (b) Aluminum alloy plate: Aluminum alloy plate material used to fabricate tank shell and manway nozzle must be suitable for fusion welding and must comply with one of the following specifications (IBR, see Sec. 171.7 of this subchapter) with its indicated minimum tensile strength and elongation in the welded condition. * * * ------------------------------------------------------------------------ Minimum Minimum tensile elongation in strength 2 inches Specifications (p.s.i.) 0 (percent) 0 temper, welded temper, welded condition \3\ condition \4\ (longitudinal) ------------------------------------------------------------------------ ASTM B 209, Alloy 5052 \1\.............. 25,000 18 [[Page 1038]] ASTM B 209, Alloy 5083 \2\.............. 38,000 16 ASTM B 209, Alloy 5086 \1\.............. 35,000 14 ASTM B 209, Alloy 5154 \1\.............. 30,000 18 ASTM B 209, Alloy 5254 \1\.............. 30,000 18 ASTM B 209, Alloy 5454 \1\.............. 31,000 18 ASTM B 209, Alloy 5652 \1\.............. 25,000 18 ------------------------------------------------------------------------ \1\ For fabrication, the parent plate material may be 0, H112, or H32 temper, but design calculations must be based on minimum tensile strength shown. \2\ 0 temper only. \3\ Weld filler metal 5556 must not be used. \4\ Maximum stress to be used in calculations. (c) High alloy steel plate. (1) High alloy steel plate must conform to the following specifications: ------------------------------------------------------------------------ Minimum Minimum tensile elongation in 2 strength inches Specifications (p.s.i.) welded (percent) weld condition\1\ metal (longitudinal) ------------------------------------------------------------------------ ASTM A 240/A 240M (incorporated by 70,000 30 reference; see Sec. 171.7 of this subchapter), Type 304L............... ASTM A 240/A 240M (incorporated by 70,000 30 reference; see Sec. 171.7 of this subchapter), Type 316L............... ------------------------------------------------------------------------ \1\ Maximum stresses to be used in calculations. (2)(i) High alloy steels used to fabricate tank must be tested in accordance with the following procedures in ASTM A 262, ``Standard Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steel'' (IBR, see Sec. 171.7 of this subchapter), and must exhibit corrosion rates not exceeding the following: * * * ------------------------------------------------------------------------ Corrosion Test procedures Material rate i.p.m. ------------------------------------------------------------------------ Practice B......................... Types 304L and 316L... 0.0040 Practice C......................... Type 304L............. 0.0020 ------------------------------------------------------------------------ (ii) Type 304L and 316L test specimens must be given a sensitizing treatment prior to testing. (d) All attachments welded to tank shell must be of approved material which is suitable for welding to the tank. [Amdt. 179-10, 36 FR 21344, Nov. 6, 1971, as amended by Amdt. 179-32, 48 FR 27707, June 16, 1983; Amdt. 179-47, 58 FR 50237, Sept. 24, 1993; Amdt. 179-52, 61 FR 28679, June 5, 1996; Amdt 179-52, 61 FR 50255, Sept. 25, 1996; 66 FR 45186, Aug. 28, 2001; 67 FR 51660, Aug. 8, 2002; 68 FR 75759, Dec. 31, 2003]