H-11 at a glance
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Designation
| Item | Value |
|---|---|
| Designation | H-11 |
| Class | Steel and stainless |
| Type | hot-work die steel |
Composition
| Item | Limit | Source |
|---|---|---|
| Composition | Chromium about 5 %, molybdenum about 1.3 %, vanadium about 0.5 %, carbon 0.38–0.43 % | SAE AMS 6487 title: 5.0Cr - 1.3Mo - 0.50V (0.38 - 0.43C) (H-11) |
Properties
| Property | Value | Source |
|---|---|---|
| Name | MIL-HDBK-5J calls it 5Cr-Mo-V aircraft steel and lists AMS 6487 for it; the title of AMS 6487 names the same chemistry as H-11 | MIL-HDBK-5J, par. 2.4.1.0 and Table 2.4.1.0(b); SAE AMS 6487 title |
| Temperature range | High strength up to 1,000 °F; air hardenable, little distortion in thick sections | MIL-HDBK-5J, par. 2.4.1.0 and Table 2.4.1.0(b); SAE AMS 6487 title |
| Quality | Consumable electrode vacuum-melted recommended for aerospace | MIL-HDBK-5J, par. 2.4.1.0 and Table 2.4.1.0(b); SAE AMS 6487 title |
| Sheet, strip, plate | AMS 6437 | MIL-HDBK-5J, Table 2.4.1.0(d) |
| Bars and forgings | AMS 6487 and AMS 6488 | MIL-HDBK-5J, Table 2.4.1.0(c) |
| Heat treatment | 1,850 ± 50 °F, hold 15–25 min for sheet or 30–60 min for bar, air cool, temper three times for 2–3 h each, air cool | MIL-HDBK-5J, par. 2.4.1.0 and Table 2.4.1.0(b); SAE AMS 6487 title |
Design allowables — 5Cr-Mo-V sheet, strip and plate, quenched and tempered
AMS 6437, S basis. MIL-HDBK-5J Tables 2.4.1.0(d) and 2.4.1.0(a).
| Property | 240 ksi level | 260 ksi level | 280 ksi level | Unit |
|---|---|---|---|---|
| Ftu, LT | 240 | 260 | 280 | ksi |
| Fty, LT | 200 | 220 | 240 | ksi |
| Fcy, LT | 220 | 240 | 260 | ksi |
| Fsu | 144 | 156 | 168 | ksi |
| Elongation, LT, in 2 in (sheet over 0.050 in) | 6 | 5 | 4 | % |
| Elongation, LT, in 1 in | 8 | 7 | 6 | % |
| Tempering temperature | 1,050 | 1,030 | 1,000 | °F |
| Hardness | 49–52 | 52–54 | 54–56 | HRC |
The tempering and hardness values are from Table 2.4.1.0(a) pages 2-66 and are listed against Ftu levels 280, 260, 240 and 220 ksi at 1,000, 1,030, 1,050 and 1,080 °F. Design values apply only to parts whose Ftu is substantiated by quality control testing. Source: MIL-HDBK-5J, Table 2.4.1.0(d), p. 2-69.
Notes from the guide
- Vacuum-melted material. The handbook recommends only that quality for aerospace.
- Sheet values only here. Bar values are in Table 2.4.1.0(c).
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Sources
- MIL-HDBK-5J, Metallic Materials and Elements for Aerospace Vehicle Structures (31 Jan 2003) — par. 2.4.1.0; Tables 2.4.1.0(a), (c) and (d), pp. 2-66 to 2-69. Cancelled; superseded by MMPDS.
- FAA AC 43.13-1B CHG 1 — par. 6-165.
- MMPDS (formerly MIL-HDBK-5) — the current home of design allowables. A repair substantiation cites MMPDS or the SRM, not a website.
- SAE AMS 6487K, Steel, Bars, and Forgings 5.0Cr - 1.3Mo - 0.50V (0.38 - 0.43C) (H-11) — Title (the full text is paywalled).
Educational reference only. not approved data. Always consult the applicable SRM, AMM, or AC 43.13-1B and your certifying authority.