Pipe, plate made of titanium PT-7M alloy
General knowledge
PT alloys of marine application were invented in Central Research Institute of Structural Materials «Prometheus». These alloys are not similar to alloys of common and aerospace intention by composition.
Titanium deformable alloys of marine application
| Grade |
Alloy type |
Zr |
Al |
Mo |
V |
Equivalent Mo |
Equivalent Al |
| PT-1M |
α-alloy |
≤ 0,3 |
0.2 — 0.7 |
|
|
--- |
1.5 |
| 3M |
---«--- |
--- |
3.5 — 5.5 |
--- |
--- |
0 |
5.5 |
| PT-7M |
---«--- |
2.0 — 3.0 |
1.8 — 2.5 |
--- |
--- |
--- |
3.6 |
| Grade 9 |
Pseudo-α-alloy |
--- |
3.5 — 5.0 |
--- |
1.2 — 2.5 |
1.4 |
5.3 |
| 5V |
Pseudo-α-alloy |
≤ 0,1 |
4.7 — 6.3 |
0.7 — 2.0 |
1.0 — 1.9 |
2.4 |
6.5 |
Comparative strength of titanium alloys
| Alloy grade |
Rupture strength |
| PT-7M |
45 — 68 kgf/mm² |
| PT-1M |
35 — 58 kgf/mm² |
| Grade 2 |
40 — 55 kgf/mm² |
| Grade 1 |
30 — 45 kgf/mm² |
Technical characteristics
| Tube |
Heat treatment |
Plasticity δ% |
Strength (MPa) |
KCU J/cm³ |
| Cold deformation Ø 5 -273 mm, l = 1 -10 mm |
Annealing |
more than 15% |
479 — 680 |
--- |
| Pipe of 16−1,5 mm diameter |
Deformable condition |
15% |
900 |
--- |
| Pipe of 16−1,5 mm diameter |
Annealing 700 — 800° |
20 — 25% |
900 |
--- |
| Hot-rolled |
Annealing |
18% |
470 — 685 |
89 |
| Extra thin-walled |
Annealing |
21% |
470 — 685 |
--- |
Heat resistance of titanium pseudo-alpha PT alloys strongly depends on a speed of cooling after heat treatment. The greatest resistance is achieved by cooling with an intermediate speed between a cooling in water or furnace.
Fatigue resistance
| Semi-fabricate |
R |
Heat treatment |
Endurance limit stress |
| Pipes of diameter 13 mm, l =1,5 mm |
— 1 |
Condition of supply |
168 (100 000 000) |
Supplier
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Buy at a bargain price
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