Titanium Ti Grade 29-STA (Solution treated and aged)
Heat-treated state
UNS R56407, R56404 · ASTM B348 Grade 29
Used where higher strength is needed in sections under ~25 mm; hardness may exceed sour-service (NACE) limits, so verify service requirements.
Values for the STA condition
Other Ti Grade 29 tempers and conditions
Ti Grade 29 is listed in 4 conditions; see the grade overview at Ti Grade 29.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AnnealedDefault mill/α-β annealed (704–790 °C, air cool) | Standard stocked condition for bar, plate, tube and forgings; best balance of strength, ductility and NACE MR0175/ISO 15156 compliance. | 830 | 900 | 15 | 33 HRC | — |
Transformed Beta | Solution-treated above the beta transus and cooled to give a lamellar/Widmanstätten transformed-beta microstructure — higher fracture toughness, creep and crack-growth resistance at the cost of ductility and smooth-bar fatigue, favoured for thick subsea forgings in Grade 29. | 830 | 910 | 11 | 34 HRC | 1 % IACS |
Stress relieved | Applied to welded assemblies, cold-drawn tube and machined parts to remove residual stress without changing microstructure appreciably. | 845 | 910 | 14 | 33 HRC | 1 % IACS |
STAThis page Solution treated and aged | Used where higher strength is needed in sections under ~25 mm; hardness may exceed sour-service (NACE) limits, so verify service requirements. | 930 | 1,000 | 11 | 36 HRC | — |
What is Ti Grade 29-STA?
Ti Grade 29-STA is Ti Grade 29 heat treated to STA — used where higher strength is needed in sections under ~25 mm; hardness may exceed sour-service (NACE) limits, so verify service requirements. Ti Grade 29-STA has a yield strength of 930 MPa (135 ksi) and a tensile strength of 1,000 MPa (145 ksi) — stronger than 86% of titanium grades. Elongation at break is 11% and the elastic modulus is 114 GPa (16.5 Msi). Ti Grade 29-STA has a density of 4.43 g/cm³ (0.16 lb/in³), lighter than 89% of titanium grades. It melts at 1,604°C (2,919 °F). Annealed is the default condition FabDigit quotes; STA is available on request or by drawing note.
Advantages
- High strength — 930 MPa (135 ksi), better than 86% of titanium grades
Limitations
- Poor heat conductor — 6.7 W/m·K (3.87 BTU/hr·ft·°F), worse than 92% of titanium grades
- Low electrical conductivity — 1 % IACS, worse than 89% of titanium grades
- Limited ductility — 11%, worse than 87% of titanium grades
- Limited formability — 20/100, worse than 83% of titanium grades
Ti Grade 29-STA properties
Typical room-temperature values for Ti Grade 29-STA; 13 are specific to this condition. Other listed values are Ti Grade 29 reference data and may not represent this condition. Bars are the position among titanium grades.
Physical3
Ti Grade 29-STA has a density of 4.43 g/cm³ (0.16 lb/in³), lighter than 89% of titanium grades. It melts at 1,604°C (2,919 °F).
Mechanical16
Ti Grade 29-STA has a yield strength of 930 MPa (135 ksi) and a tensile strength of 1,000 MPa (145 ksi) — stronger than 86% of titanium grades. Elongation at break is 11% and the elastic modulus is 114 GPa (16.5 Msi).
Thermal6
Ti Grade 29-STA is rated for continuous service to 315°C (599 °F). It conducts heat at 6.7 W/m·K (3.87 BTU/hr·ft·°F), worse than 92% of titanium grades. Thermal expansion is 8.7 µm/m·K (4.83 µin/in·°F).
Electrical3
Ti Grade 29-STA conducts electricity at 1 % IACS, worse than 89% of titanium grades.
Chemical & Environmental3
Corrosion resistance is excellent (96/100), better than 92% of titanium grades.
Sustainability4
Producing a kilogram of Ti Grade 29-STA takes about 650 MJ of energy and emits 45 kg of CO₂ — less than 75% of titanium grades. Typical recycled content is 25%.
Manufacturability8
Ti Grade 29-STA's machinability is poor (16/100, worse than 93% of titanium grades); weldability very good (80/100); formability poor (20/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Ti Grade 29-STA
Is Ti Grade 29 easy to machine?
Machine like Ti-6Al-4V ELI: rigid setup, sharp uncoated-carbide or PVD tools, low surface speed (25–45 m/min), heavy positive-pressure flood coolant, and never dwell in the cut.
Can Ti Grade 29 be welded?
Excellent GTAW/EBW/laser weldability with matching Gr.29 filler, but weld and heat-affected zone must be fully shielded/trailed with argon below 425 °C to avoid oxygen and hydrogen pickup.
Can Ti Grade 29 be formed, bent or molded?
Cold formability is limited (large bend radii, high springback); hot form or size at 590–760 °C, then stress relieve.
What surface finishes work on Ti Grade 29?
Pickle in HNO₃/HF to remove alpha case after hot work; colour anodising or a nitride/DLC coat is used for identification and anti-galling — do not plate with cadmium or expose to hot chlorides during cleaning.
Ti Grade 29 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 |
|---|---|---|
| Al | 5.5 – 6.5 | 6 |
| V | 3.5 – 4.5 | 4 |
| Rucorrosion-enhancing addition | 0.08 – 0.14 | 0.1 |
| Fe | ≤ 0.25 | 0.15 |
| OELI oxygen limit | ≤ 0.13 | 0.11 |
| C | ≤ 0.08 | 0.02 |
| N | ≤ 0.03 | 0.01 |
| H0.0125 % bar/billet; 0.015 % sheet per product form | ≤ 0.01 | 0.01 |
| Ywhen specified | ≤ 0.01 | — |
| Other, eachresiduals; total max 0.4 | ≤ 0.1 | — |
| Ti | balance | — |
Ti Grade 29-STA — frequently asked
What is Ti Grade 29-STA used for?
Ti Grade 29-STA is typically used for subsea components, oil & gas fasteners and chemical processing parts. In short: best-welding alpha-beta titanium; ruthenium-modified Ti-6Al-4V ELI; subsea corrosion grade.
What is the yield strength of Ti Grade 29-STA?
Ti Grade 29-STA has a typical yield strength of 930 MPa (135 ksi) and a tensile strength of 1,000 MPa (145 ksi) — stronger than 86% of titanium grades. Strength varies by condition: see the 4 listed tempers.
Is Ti Grade 29-STA easy to machine?
Not especially — machinability is rated poor (16/100, worse than 93% of titanium grades). Machine like Ti-6Al-4V ELI: rigid setup, sharp uncoated-carbide or PVD tools, low surface speed (25–45 m/min), heavy positive-pressure flood coolant, and never dwell in the cut.
Can Ti Grade 29-STA be welded?
Yes — weldability is rated very good (80/100). Excellent GTAW/EBW/laser weldability with matching Gr.29 filler, but weld and heat-affected zone must be fully shielded/trailed with argon below 425 °C to avoid oxygen and hydrogen pickup.
What surface finishes work on Ti Grade 29-STA?
Pickle in HNO₃/HF to remove alpha case after hot work; colour anodising or a nitride/DLC coat is used for identification and anti-galling — do not plate with cadmium or expose to hot chlorides during cleaning.
Can Ti Grade 29-STA be formed, bent or molded?
Cold formability is limited (large bend radii, high springback); hot form or size at 590–760 °C, then stress relieve.
What is the maximum service temperature of Ti Grade 29-STA?
Ti Grade 29-STA is rated for continuous use to about 315°C (599 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Ti Grade 29 Annealed and Ti Grade 29-STA?
Annealed is the default condition — standard stocked condition for bar, plate, tube and forgings; best balance of strength, ductility and NACE MR0175/ISO 15156 compliance. STA: used where higher strength is needed in sections under ~25 mm; hardness may exceed sour-service (NACE) limits, so verify service requirements. Yield strength is 830 MPa in Annealed versus 930 MPa in STA.
Sources
- ASTM B348 / B348M — Titanium and Titanium Alloy Bars and Billets (Grade 29) — ASTM International (2021)
- ASTM B265 — Titanium and Titanium Alloy Strip, Sheet and Plate (Grade 29) — ASTM International (2020)
- ASTM B861 / B862 — Titanium Alloy Seamless and Welded Pipe — ASTM International (2019)
- ANSI/NACE MR0175 / ISO 15156-3 — Materials for H₂S-containing environments — NACE/ISO (2020)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- Materials Properties Handbook: Titanium Alloys — ASM International (1994)
- Ru-enhanced Ti-6Al-4V (Grade 29) alloy data — TIMET / ATI (2022)
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.