304 at a glance
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Designation
| Item | Value |
|---|---|
| Designation | 304 |
| Class | Steel and stainless |
| Type | austenitic stainless steel |
Composition
| Item | Limit | Source |
|---|---|---|
| Composition | Chromium 17.5–19.5 %, nickel 8.0–10.5 %, carbon up to 0.07 % | ASTM A240/A240M Table 1 (UNS S30400) |
Properties
| Property | Value | Source |
|---|---|---|
| Specs by temper | AMS 5513 annealed, 5910 ¼ H, 5911 ½ H, 5912 ¾ H, 5913 full hard | MIL-HDBK-5J, Table 2.7.1.0(b) footnote b |
| Allowables | The 301 table applies for those specifications | MIL-HDBK-5J, Table 2.7.1.0(b) footnote b |
| Welding rod | 308L, AWS A5.9 | AC 43.13-1B CHG 1, Table 4-15 |
| Class | Austenitic, nonmagnetic, 300 series | AC 43.13-1B par. 6-164b |
Design allowables — sheet and strip by temper (properties of AISI 301 table, applicable to 304)
0.187 in and under. MIL-HDBK-5J Table 2.7.1.0(b), L and LT as printed.
| Temper | Specification | Ftu L / LT, ksi | Fty L / LT, ksi | Fsu, ksi | Basis |
|---|---|---|---|---|---|
| Annealed | AMS 5513 | 73 / 75 | 26 / 30 | 50 | S |
| ¼ hard | AMS 5910 | 124 / 122 | 69 / 67 | 66 | A |
| ½ hard | AMS 5911 | 141 / 142 | 93 / 92 | 77 | A |
| ¾ hard | AMS 5912 | 157 / 163 | 118 / 113 | 88 | A |
| Full hard | AMS 5913 | 174 / 175 | 137 / 125 | 95 | A |
Properties of the 300-series alloys that the handbook ties to Table 2.7.1.0(b) by footnote. Fsu and Ftu: Table 2.7.1.0(b), p. 2-223; E 29.0 × 10³ ksi annealed (L and LT), falling to 26–28 ksi × 10³ in the hard tempers; density 0.286 lb/in³. Cold-worked tempers lose strength above 900 °F. Yield, particularly in compression, and longitudinal modulus can be raised appreciably by stress relieving at 500 to 800 °F. MIL-HDBK-5J (2003) is superseded by MMPDS.
Notes from the guide
- Values come from the 301 table by footnote.
- Not for firewalls or hot parts by default. Those call for the alloy on the drawing (321, 347, 301).
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Sources
- MIL-HDBK-5J, Metallic Materials and Elements for Aerospace Vehicle Structures (31 Jan 2003) — Table 2.7.1.0(b), footnote b, p. 2-223. Cancelled; superseded by MMPDS.
- FAA AC 43.13-1B CHG 1 — Table 4-15 and par. 6-164.
- FAA-H-8083-31B, Aviation Maintenance Technician Handbook, Airframe, Volume 1 — Chapter 5, p. 5-22.
- MMPDS (formerly MIL-HDBK-5) — the current home of design allowables. A repair substantiation cites MMPDS or the SRM, not a website.
- ASTM A240/A240M, Plate, Sheet, and Strip of Chromium and Chromium-Nickel Stainless Steel — Table 1, chemical requirements (edition 10b read).
Educational reference only. not approved data. Always consult the applicable SRM, AMM, or AC 43.13-1B and your certifying authority.