Titanium TA17-SR (Stress relieved)
Heat-treated state
GB TA17
Use after welding, forming or rough machining to remove residual stress and restore weld-zone ductility without losing much strength.
Values for the SR condition
Other TA17 tempers and conditions
TA17 is listed in 5 conditions; see the grade overview at TA17.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
MDefault Thermomechanically controlled processed | Standard stocked condition: best combination of ductility, weldability and dimensional stability for structural sheet and plate. | 620 | 730 | 16 | 235 HB | — |
As-welded deposit | Reference condition for design of welded marine structures: joint efficiency is high but joint ductility is below base metal until stress relieved. | 630 | 720 | 10 | 26 HRC | 1.1 % IACS |
SRThis page Stress relieved | Use after welding, forming or rough machining to remove residual stress and restore weld-zone ductility without losing much strength. | 640 | 740 | 15 | 24 HRC | 1.1 % IACS |
As hot-rolled / hot-worked | Pick for heavy plate, forgings and large bar where the as-hot-worked strength is adequate and full annealing is uneconomic. | 650 | 760 | 14 | 25 HRC | 1.1 % IACS |
Cold worked | Choose for thin strip, tube and wire needing higher strength and straightness; ductility and weld ductility are reduced. | 780 | 860 | 8 | 29 HRC | 1.1 % IACS |
What is TA17-SR?
TA17-SR is TA17 heat treated to SR — use after welding, forming or rough machining to remove residual stress and restore weld-zone ductility without losing much strength. TA17-SR has a yield strength of 640 MPa (92.8 ksi) and a tensile strength of 740 MPa (107 ksi) — stronger than 51% of titanium grades. Elongation at break is 15% and the elastic modulus is 110 GPa (16 Msi). TA17-SR has a density of 4.48 g/cm³ (0.162 lb/in³), lighter than 71% of titanium grades. It melts at 1,650°C (3,002 °F). M is the default condition FabDigit quotes; SR is available on request or by drawing note.
TA17-SR properties
Typical room-temperature values for TA17-SR; 22 are specific to this condition. Other listed values are TA17 reference data and may not represent this condition. Bars are the position among titanium grades.
Physical3
TA17-SR has a density of 4.48 g/cm³ (0.162 lb/in³), lighter than 71% of titanium grades. It melts at 1,650°C (3,002 °F).
Mechanical16
TA17-SR has a yield strength of 640 MPa (92.8 ksi) and a tensile strength of 740 MPa (107 ksi) — stronger than 51% of titanium grades. Elongation at break is 15% and the elastic modulus is 110 GPa (16 Msi).
Thermal6
TA17-SR is rated for continuous service to 350°C (662 °F). It conducts heat at 9 W/m·K (5.2 BTU/hr·ft·°F), better than 55% of titanium grades. Thermal expansion is 8.6 µm/m·K (4.78 µin/in·°F).
Electrical3
TA17-SR conducts electricity at 1.1 % IACS, worse than 67% of titanium grades.
Chemical & Environmental3
Corrosion resistance is excellent (92/100), better than 53% of titanium grades.
Sustainability4
Producing a kilogram of TA17-SR takes about 650 MJ of energy and emits 40 kg of CO₂ — less than 75% of titanium grades. Typical recycled content is 25%.
Manufacturability8
TA17-SR's machinability is poor (27/100, better than 57% of titanium grades); weldability very good (80/100); formability fair (54/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with TA17-SR
Is TA17 easy to machine?
Low speed, heavy positive-rake carbide, rigid setup and flood coolant; avoid dwell and rubbing to prevent work hardening and fire risk from fine chips.
Can TA17 be welded?
Very good with GTAW, plasma or EBW using matching or CP-Ti filler under high-purity argon/trailing shield or vacuum; keep O/N/H pickup low and clean joints chemically before welding.
Can TA17 be formed, bent or molded?
Cold form in the annealed condition with generous bend radii (≈4–5t) and allow for springback; warm forming at 300–500 °C markedly improves formability and reduces residual stress.
What surface finishes work on TA17?
Pickle in HNO3/HF to remove alpha case after hot work; colour anodize or thermally oxidise for anti-galling, and use dry-film lube or coatings where titanium-on-titanium contact occurs.
TA17 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Alalpha stabiliser, main strengthener | 3.5 – 5 | 4.2 |
| Vbeta stabiliser for ductility/weldability | 1.5 – 3 | 2.2 |
| Fe | ≤ 0.25 | — |
| Si | ≤ 0.12 | — |
| C | ≤ 0.08 | — |
| N | ≤ 0.05 | — |
| H0.015 max for bar/forgings in some specs | ≤ 0.01 | — |
| O | ≤ 0.15 | — |
| Other, eachtotal others ≤ 0.40 | ≤ 0.1 | — |
| Ti | balance | — |
TA17-SR — frequently asked
What is TA17-SR used for?
TA17-SR is typically used for airframe sheet-metal panels and skins, welded structural frames and brackets, aircraft ducting and tube assemblies, formed stiffeners and clips, welded sheet enclosures and covers and machined fittings from annealed bar. In short: weldable near-alpha sheet titanium; stronger than CP titanium; 350 °C service ceiling.
What is the yield strength of TA17-SR?
TA17-SR has a typical yield strength of 640 MPa (92.8 ksi) and a tensile strength of 740 MPa (107 ksi) — stronger than 51% of titanium grades. Strength varies by condition: see the 5 listed tempers.
Is TA17-SR easy to machine?
Not especially — machinability is rated poor (27/100, better than 57% of titanium grades). Low speed, heavy positive-rake carbide, rigid setup and flood coolant; avoid dwell and rubbing to prevent work hardening and fire risk from fine chips.
Can TA17-SR be welded?
Yes — weldability is rated very good (80/100). Very good with GTAW, plasma or EBW using matching or CP-Ti filler under high-purity argon/trailing shield or vacuum; keep O/N/H pickup low and clean joints chemically before welding.
What surface finishes work on TA17-SR?
Pickle in HNO3/HF to remove alpha case after hot work; colour anodize or thermally oxidise for anti-galling, and use dry-film lube or coatings where titanium-on-titanium contact occurs.
Can TA17-SR be formed, bent or molded?
Cold form in the annealed condition with generous bend radii (≈4–5t) and allow for springback; warm forming at 300–500 °C markedly improves formability and reduces residual stress.
What is the maximum service temperature of TA17-SR?
TA17-SR is rated for continuous use to about 350°C (662 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between TA17-M and TA17-Y?
M is the default condition — standard stocked condition: best combination of ductility, weldability and dimensional stability for structural sheet and plate. Y: choose for thin strip, tube and wire needing higher strength and straightness; ductility and weld ductility are reduced. Yield strength is 620 MPa in M versus 780 MPa in Y.
Sources
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys (Titanium section) — ASM International (1990)
- Baoji titanium mill product datasheets (TA17 sheet/plate/bar) (2023)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.