321 at a glance
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Designation
| Item | Value |
|---|---|
| Designation | 321 |
| Class | Steel and stainless |
| Type | austenitic stainless steel |
Composition
| Item | Limit | Source |
|---|---|---|
| Composition | Carbon 0.08 %, chromium 18 %, nickel 11 %, stabilized with titanium | AC 43.13-1B CHG 1, Table 4-3 |
Properties
| Property | Value | Source |
|---|---|---|
| Class | Austenitic | AC 43.13-1B CHG 1, Table 4-3 |
| Sheet, strip, plate | AMS 5510 | SAE AMS 5510 (title) |
| Allowables | Not in MIL-HDBK-5J (checked); use the spec minimums, MMPDS or the manufacturer | MIL-HDBK-5J |
| Welding | Weldable like the other austenitic grades; the handbook lists 347 among fillers for austenitic types | AMT Handbook, p. 5-22 |
Notes from the guide
- No allowables here. Use the spec or MMPDS.
- No weld procedure. Follow the SRM.
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Sources
- FAA AC 43.13-1B CHG 1 — Table 4-3, par. 6-164.
- FAA-H-8083-31B, Aviation Maintenance Technician Handbook, Airframe, Volume 1 — Chapter 5, TIG welding stainless steel, p. 5-22.
- SAE AMS 5510 — title of the sheet, strip and plate specification.
- MMPDS (formerly MIL-HDBK-5) — the current home of design allowables. A repair substantiation cites MMPDS or the SRM, not a website.
Educational reference only. not approved data. Always consult the applicable SRM, AMM, or AC 43.13-1B and your certifying authority.