Chemical composition
Nominal: mid-range where both limits are given, the cap where only a maximum is, balance takes the remainder. Exact specified ranges below.
| Element | Name | Content % | |
|---|---|---|---|
| Main elements5 elements | |||
| Ti | Titanium | Bal. | |
| Al | Aluminium | 5.8 – 7% | |
| Mo | Molybdenum | 2.8 – 3.8% | |
| Zr | Zirconium | 0.8 – 2% | |
| Si | Silicon | 0.2 – 0.35% | |
| Element | Name | Content % | |
|---|---|---|---|
| Minor & residual7 elements | |||
| Fe | Iron | ≤ 0.25% | |
| C | Carbon | ≤ 0.08% | |
| N | Nitrogen | ≤ 0.05% | |
| H | Hydrogen | ≤ 0.012% | |
| O | Oxygen | ≤ 0.15% | |
| Other | Other elements, each | ≤ 0.1% | |
| Other | Other elements, total | ≤ 0.4% | |
Mechanical minima by form
Guaranteed values differ by form, size and delivery condition; quotations confirm the specification, form, size and condition.
| Form | Condition | Rm MPa | Rp0.2 MPa | A ≥ % | Other requirements and notes |
|---|---|---|---|---|---|
| Bar | Annealed (M) / hot-worked (R) / cold-worked (Y), dia. or section 7–100 mm | ≥ 1030 | ≥ 900 | ≥ 10 | Also specified: Reduction of area Z ≥ 30 % Properties are measured on heat-treated test blanks. |
Stress-rupture requirement
| Heat treatment | Annealed and aged bar |
| Test temperature | 500 °C |
| Test stress | 640 MPa |
| Minimum life | ≥ 35 h |
The same row also requires an elevated-temperature tensile strength of ≥685 MPa at 500 °C.
More detail 2
There is a second acceptance path: on failure, the lot may be retested at 500 °C under 590 MPa for t ≥ 100 h, and passing that qualifies the lot — a lower stress traded for a longer time, and a written rule rather than a concession.
Assessed only when stated on the order.
This is a pass/fail acceptance test, not a design creep curve.
Where this grade is recommended
Matched in 1 service conditions; ranks and scores computed from the condition-scoring matrix.
| Service condition | Industry | Temperature | Rank | Score |
|---|---|---|---|---|
| Turbine discs & blades | Aerospace | 600 – 800 °C | 8 / 8 | 63 |
Designations & equivalents
| Trade name(s) | Ti-6.5Al-3.5Mo-1.5Zr |
| GOST (Russia) | ≈ ВТ9 |
Cross-references are common near-equivalents for search and shortlisting; substitution across standards requires clause-by-clause verification. All grades in one cross-reference table →
Applicable standards
2 specifications. Name the standard and its edition on the order.
Guaranteed values and required tests differ between specifications — see Mechanical minima by form for the figures per form.
Frequently asked questions
What is TC11 (Ti-6.5Al-3.5Mo-1.5Zr)?
TC11 (Ti-6.5Al-3.5Mo-1.5Zr) — Titanium. Aero compressor discs and blades, 500 °C class
What is the maximum service temperature of TC11?
Typically about 500 °C; the practical limit depends on media, stress and design life — acceptance per the governing standard.
What is the tensile strength of TC11?
The specified minimum tensile strength is 1030 MPa for the main product form. Minima for other forms and sizes are listed under "Mechanical minima by form" on this page.
Which standards cover TC11?
GB/T 2965, GB/T 3620.1
Where is TC11 typically used?
Turbine discs & blades (Aerospace)
In which forms is TC11 available?
Tube, plate, strip, bar, forgings, wire and other forms — sizes and delivery condition confirmed per order, with EN 10204 3.1 / 3.2 certification.
Same series
Download PDF datasheet
This grade’s datasheet as an A4 PDF — for filing, printing or forwarding to colleagues.
Download PDF datasheetSupply & enquiry
Tube & pipeφ1 – 219 × 0.25 – 25 mm
Plate4.76 – 80 mm
Barφ8 – 300 mm
Wire & filler metalsφ0.01 – 8 mmFor this grade we can supply, against your service conditions:
- Tube, plate, strip, bar, forgings, wire and more — with size range and lead time
- Chemistry and mechanical test report (EN 10204 3.1 / 3.2)
- Like-for-like alternatives and selection advice
- Applicable standards and inspection scope
Or email us: info@kochlin.com