U.S. Code of Federal Regulations

Regulations most recently checked for updates: Jan 25, 2020

§ 179.300-7 - Materials.

(a) Steel plate material used to fabricate tanks must conform with the following specifications with the indicated minimum tensile strength and elongation in the welded condition. However, the maximum allowable carbon content for carbon steel must not exceed 0.31 percent, although the individual ASTM specification may allow for a greater amount of carbon. The plates may be clad with other approved materials:

Specifications 2 Tensile strength (psi) welded condition 1 (minimum) Elongation in 2 inches (percent) welded condition 1 (longitudinal) (minimum)
ASTM A 240/A 240M type 30475,00025
ASTM A 240/A 240M type 304L70,00025
ASTM A 240/A 240M type 31675,00025
ASTM A 240/A 240M type 316L70,00025
ASTM A 240/A 240M type 32175,00025
ASTM A 285 Gr. A45,00029
ASTM A 285 Gr. B50,00020
ASTM A 285 Gr. C55,00020
ASTM A 515/A 515M Gr. 6565,00020
ASTM A 515/A 515M Gr. 7070,00020
ASTM A 516/A 516M Gr. 7070,00020

1 Maximum stresses to be used in calculations.

2 These specifications are incorporated by reference (IBR, see § 171.7 of this subchapter.)

(b) [Reserved]

(c) All plates must have their heat number and the name or brand of the manufacturer legibly stamped on them at the rolling mill.

[Amdt. 179-10, 36 FR 21355, Nov. 6, 1971, as amended by Amdt. 179-42, 54 FR 38798, Sept. 20, 1989; Amdt. 179-43, 55 FR 27642, July 5, 1990; Amdt. 179-52, 61 FR 28682, June 5, 1996; Amdt. 179-52, 61 FR 50255, Sept. 25, 1996; Amdt. 179-53, 61 FR 51342, Oct. 1, 1996; 68 FR 75763, Dec. 31, 2003]