CP titanium Grade 1 at a glance
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Designation
| Item | Value |
|---|---|
| Designation | CP titanium Grade 1 |
| Class | Titanium |
| Type | commercially pure titanium |
Properties
| Property | Value | Source |
|---|---|---|
| Type | Unalloyed titanium, annealed; excellent formability, readily welded or brazed | MIL-HDBK-5J, par. 5.2.1.0 |
| MIL-HDBK-5J name | CP-4 under AMS-T-9046, equal in strength to ASTM Grade 1 | MIL-HDBK-5J, Table 5.2.1.0(b); ASTM B265 grade strengths |
| Specification | AMS-T-9046 (CP-4) | MIL-HDBK-5J, Table 5.2.1.0(a) |
| Oxygen limit | 0.18 % max (interstitials set the grade) | ASTM B265-10 Table 2 (Grade 1) |
| Full anneal | 1,000 to 1,300 °F for 10 to 30 minutes | MIL-HDBK-5J, par. 5.2.1.0 |
| Stress relief | 900 to 1,000 °F for 30 minutes | MIL-HDBK-5J, par. 5.2.1.0 |
| Density | 0.163 lb/in³ (about 4.51 g/cm³, converted) | MIL-HDBK-5J, Table 5.2.1.0(b) |
Design allowables — CP titanium Grade 1 sheet, strip and plate, annealed
Annealed, 1.000 in and under, MIL-HDBK-5J Table 5.2.1.0(b), p. 5-7.
| Property | S basis | Unit |
|---|---|---|
| Ftu, L and LT | 35 | ksi |
| Fty, L and LT | 25 | ksi |
| Elongation, L and LT (0.025 in and over) | 24 | % |
| E | 15.5 | 10³ ksi |
| G | 6.5 | 10³ ksi |
| Density | 0.163 | lb/in³ |
The handbook labels the four sheet strength levels CP-4 to CP-1, with minimum Ftu of 35, 50, 65 and 80 ksi; this page assigns them to Grades 1 to 4 by strength, as ASTM B265 does. Check the spec on your certificate: the handbook yield figures are the AMS and MIL-T-9046 minimums and may differ from ASTM B265 minimums (B265-10 gives 20 ksi minimum yield for Grade 1 against 25 ksi in the handbook; Grades 2 to 4 agree at 40, 55 and 70 ksi).
Notes from the guide
- Annealed values. Forming and heat change them.
- Not a substitute for an alloy grade or for aluminum; the drawing names the grade.
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Sources
- FAA AC 43.13-1B CHG 1 — par. 6-181.
- FAA-H-8083-31B, Aviation Maintenance Technician Handbook, Airframe, Volume 1 — pp. 4-85 and 4-86, titanium.
- MIL-HDBK-5J, Metallic Materials and Elements for Aerospace Vehicle Structures (31 Jan 2003) — par. 5.2.1.0 and Tables 5.2.1.0(a), (b), pp. 5-6 and 5-7. Cancelled; superseded by MMPDS.
- FAA AC 43.13-1B CHG 1 — Table 4-15.
- MMPDS (formerly MIL-HDBK-5) — the current home of design allowables. A repair substantiation cites MMPDS or the SRM, not a website.
- ASTM B265, Titanium and Titanium Alloy Strip, Sheet, and Plate — Table 1 (tensile) and Table 2 (chemical), edition 10 read.
Educational reference only. not approved data. Always consult the applicable SRM, AMM, or AC 43.13-1B and your certifying authority.