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Code of Federal Regulations Title 49. Transportation § 49.179.100–7 Materials

Current as of January 02, 2025 | Updated by Findlaw Staff

(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.

Specifications

Minimum
tensile
strength
(p.s.i.)
welded
condition 1

Minimum elongation in 2
inches (percent)
welded
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 § 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 § 171.7 of this subchapter) with its indicated minimum tensile strength and elongation in the welded condition.***

Specifications

Minimum
tensile
strength
(p.s.i.)
0 temper,
welded
condition 3 4

Minimum elongation in 2
inches (percent)
0 temper, welded
condition
(longitudinal)

ASTM B 209, Alloy 50521․․․․․․․․․․․․․․․․․․․

25,000

18

ASTM B 209, Alloy 50832․․․․․․․․․․․․․․․․․․․

38,000

16

ASTM B 209, Alloy 50861․․․․․․․․․․․․․․․․․․․

35,000

14

ASTM B 209, Alloy 51541․․․․․․․․․․․․․․․․․․․

30,000

18

ASTM B 209, Alloy 52541․․․․․․․․․․․․․․․․․․․

30,000

18

ASTM B 209, Alloy 54541․․․․․․․․․․․․․․․․․․․

31,000

18

ASTM B 209, Alloy 56521․․․․․․․․․․․․․․․․․․․

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:

Specifications

Minimum
tensile
strength
(p.s.i.)
welded
condition 1

Minimum elongation in 2
inches (percent)
weld metal
(longitudinal)

ASTM A 240/A 240M (incorporated by reference;  see § 171.7 of this subchapter), Type 304L

70,000

30

ASTM A 240/A 240M (incorporated by reference;  see § 171.7 of this subchapter), Type 316L

70,000

30

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 § 171.7 of this subchapter), and must exhibit corrosion rates not exceeding the following:***

Test procedures

Material

Corrosion
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.

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Cite this article: FindLaw.com - Code of Federal Regulations Title 49. Transportation § 49.179.100–7 Materials - last updated January 02, 2025 | https://codes.findlaw.com/cfr/title-49-transportation/cfr-sect-49-179-100-7/

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