302 at a glance
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Designation
| Item | Value |
|---|---|
| Designation | 302 |
| Class | Steel and stainless |
| Type | austenitic stainless steel |
Composition
| Item | Limit | Source |
|---|---|---|
| Composition | Carbon 0.15 %, chromium 18 %, nickel 9 %: austenitic | AC 43.13-1B CHG 1, Table 4-3 |
Properties
| Property | Value | Source |
|---|---|---|
| The 18-8 family | 18 percent chromium, 8 percent nickel | AC 43.13-1B CHG 1, par. 4-104 |
| Specs by temper | AMS 5516 annealed, 5903 ¼ H, 5904 ½ H, 5905 ¾ H, 5906 full hard | MIL-HDBK-5J, Table 2.7.1.0(b) footnote a |
| Allowables | The 301 table applies to 302 for those specifications | MIL-HDBK-5J, Table 2.7.1.0(b) footnote a |
Design allowables — sheet and strip by temper (properties of AISI 301 table, applicable to 302)
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 5516 | 73 / 75 | 26 / 30 | 50 | S |
| ¼ hard | AMS 5903 | 124 / 122 | 69 / 67 | 66 | A |
| ½ hard | AMS 5904 | 141 / 142 | 93 / 92 | 77 | A |
| ¾ hard | AMS 5905 | 157 / 163 | 118 / 113 | 88 | A |
| Full hard | AMS 5906 | 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and longitudinal modulus can be raised appreciably by stress relieving at 500 to 800 °F. MIL-HDBK-5J (2003) is superseded by MMPDS.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
- Properties come from the 301 table by footnote, not from a 302 test table.
- Not a substitute for the alloy on the drawing.
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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 a, p. 2-223. Cancelled; superseded by MMPDS.
- FAA AC 43.13-1B CHG 1 — Table 4-3 and par. 4-104, 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.
Educational reference only. not approved data. Always consult the applicable SRM, AMM, or AC 43.13-1B and your certifying authority.