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- Query: `57 FR 45465`
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- Exported: 2026-08-24T04:12:18.760Z

## 1. Minimum thickness of shells and heads.

**Citation:** 49 CFR 178.270-5  
**Type / status:** regulation / historical  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective / published:** 2005-10-01 / Not stated

(a) For the purposes of this section, mild steel is steel with a guaranteed minimum tensile strength of 37 decanewtons per square millimeter (53,650 p.s.i.) and a guaranteed elongation of 27 percent or greater. (b) Except as otherwise provided in this subchapter, the shell and heads of each portabl

### Provenance

- Official: Yes
- Source: <https://www.govinfo.gov/app/details/CFR-2005-title49-vol2/CFR-2005-title49-vol2-sec178-270-5>
- Source ID: `govinfo-cfr`
- SHA-256: `a72535af33cb3d590b3a15a6795a52daad2cd88e50b63c28eb151810d9a2bcac`
- Retrieved: 2026-08-13T06:37:34.028Z
- Document slug: `49-cfr-178-270-5`
- Related records: 0