---
kind: "section"
citation: "46 C.F.R. § 154.172"
title: "46"
number: "154.172"
heading: "Contiguous steel hull structure."
url: "https://uscodex.org/cfr/46/154.172"
---

# §154.172. Contiguous steel hull structure.

- (a) Except as allowed in paragraphs [(b)](#b) and [(c)](#c) of this section, plates, forgings, forged and rolled fittings, and rolled and forged bars and shapes used in the construction of the contiguous steel hull structure must meet the thickness and steel grade in Table 1 for the temperatures under §§ [154.174(b)](/cfr/46/154.174.md?p=b) and [154.176(b)](/cfr/46/154.176.md?p=b).
- (b) for a minimum temperature, determined under §§ [154](/cfr/46/154.md),[174(b)](/cfr/46/174.md?p=b) and [154.176(b)](/cfr/46/154.176.md?p=b), below −25 °C (−13 °F), the contiguous steel hull structure must meet [§ 54.25-10](/cfr/46/54.25-10.md) for that minimum temperature.
- (c) If a steel grade that is not listed in Table 1 has the equivalent chemical properties, mechanical properties, and heat treatment of a steel grade that is listed, the steel grade not listed may be specially approved by the Commandant (CG-ENG), for use in the contiguous hull structure.

## Notes

### Amendments

[CGD 74-289, 44 FR 26009, May 3, 1979, as amended by CGD 82-063b, 48 FR 4782, Feb. 3, 1983; CGD 77-069, 52 FR 31630, Aug. 21, 1987]

### Authority

Authority: 46 U.S.C. 3703, 9101; Department of Homeland Security Delegation No. 0170.1.

### Source

Source: CGD 74-289, 44 FR 26009, May 3, 1979, unless otherwise noted.

### Amendments

[CGD 74-289, 44 FR 26009, May 3, 1979, as amended by CGD 82-063b, 48 FR 4782, Feb. 3, 1983; CGD 77-069, 52 FR 31630, Aug. 21, 1987]