Titanium Ti Grade 15
UNS R53415
Ti Grade 15 (UNS R53415, ASTM B265/B338) is the highest-interstitial, highest-strength variant of the Ti-Ni-Ru corrosion-resistant titanium family.
Reference datasheet — Ti Grade 15 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the Annealed condition
Ti Grade 15 tempers and conditions
Ti Grade 15 is supplied in 3 conditions, soft to hard. Annealed is the default FabDigit quotes; the values on this page are for it.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AnnealedDefault mill annealed sheet, plate, bar and tube (ASTM B265/B338/B348) | Standard stocked condition for pressure-vessel plate, heat-exchanger tube and machined parts in hot chloride service. | 450 | 550 | 20 | 200 HB | — |
Hot worked / as-hot-rolled | Economical heavy-section plate, forgings (ASTM B381) and billet where mill-annealed properties are essentially met as-worked. | 470 | 560 | 18 | 210 HB | 3.1 % IACS |
Cold worked and stress relieved | Choose for higher strength and tighter tolerance in cold-drawn bar, tubing and fasteners where ductility can be traded away. | 560 | 640 | 14 | 22 HRC | — |
Supply forms, finishes and certifications
Ways Ti Grade 15 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
WLD-ANN | Welded and annealed tube | Supply form |
What is Ti Grade 15?
Ti Grade 15 (UNS R53415, ASTM B265/B338) is the highest-interstitial, highest-strength variant of the Ti-Ni-Ru corrosion-resistant titanium family. Engineers specify it where crevice-corrosion resistance has to come with more mechanical strength than unalloyed CP titanium; it is supplied as plate, sheet, bar and tube in annealed, CW-SR, hot-worked and weld-annealed conditions. Annealed properties are 450 MPa yield, 550 MPa tensile, 20% elongation and about 200 HB (94 HRB), with service to 315 °C. Weldability is good (85/100), but machinability (35) and formability (50) are low; Grade 7 or Grade 16 suit parts that need heavy forming instead of strength. Ti Grade 15 has a density of 4.51 g/cm³ (0.163 lb/in³), heavier than 57% of titanium grades. It melts at 1,650°C (3,002 °F). Ti Grade 15 has a yield strength of 450 MPa (65.3 ksi) and a tensile strength of 550 MPa (79.8 ksi) — weaker than 65% of titanium grades. Elongation at break is 20% and the elastic modulus is 105 GPa (15.2 Msi).
What is Ti Grade 15 used for?
- structural chemical process components
- pressure equipment
- marine hardware
Advantages
- Easy to machine — 35/100, better than 78% of titanium grades
- High electrical conductivity — 3.1 % IACS, better than 75% of titanium grades
Ti Grade 15 properties
Typical room-temperature values for Ti Grade 15-Annealed; bars are the position among titanium grades.
Physical3
Ti Grade 15 has a density of 4.51 g/cm³ (0.163 lb/in³), heavier than 57% of titanium grades. It melts at 1,650°C (3,002 °F).
Mechanical16
Ti Grade 15 has a yield strength of 450 MPa (65.3 ksi) and a tensile strength of 550 MPa (79.8 ksi) — weaker than 65% of titanium grades. Elongation at break is 20% and the elastic modulus is 105 GPa (15.2 Msi).
Thermal6
Ti Grade 15 is rated for continuous service to 315°C (599 °F). It conducts heat at 16.4 W/m·K (9.48 BTU/hr·ft·°F), better than 71% of titanium grades. Thermal expansion is 8.8 µm/m·K (4.89 µin/in·°F).
Electrical3
Ti Grade 15 conducts electricity at 3.1 % IACS, better than 75% of titanium grades.
Chemical & Environmental3
Corrosion resistance is excellent (96/100), better than 92% of titanium grades.
Sustainability4
Producing a kilogram of Ti Grade 15 takes about 620 MJ of energy and emits 38 kg of CO₂ — less than 97% of titanium grades. Typical recycled content is 25%.
Manufacturability8
Ti Grade 15's machinability is fair (35/100, better than 78% of titanium grades); weldability excellent (85/100); formability fair (50/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the titanium family
Yield strength against density for every titanium grade FabDigit runs. Ti Grade 15 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Ti Grade 15
Is Ti Grade 15 easy to machine?
Machine slow-speed/high-feed with rigid setups, sharp uncoated-carbide or coated tooling and flood chlorine-free coolant; avoid dwelling to prevent work hardening and fire risk from fine chips.
Can Ti Grade 15 be welded?
Excellent GTAW/PAW/EBW weldability with matching Gr.15 or Gr.2/Ru filler, provided the puddle and hot trailing zone are fully argon-shielded (back purge mandatory); keep straw/blue tint out of the joint.
Can Ti Grade 15 be formed, bent or molded?
Cold bend to ≥3–4 t radius with generous springback allowance; warm forming at 200–350 °C greatly improves formability of this high-oxygen grade.
Ti Grade 15 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 |
|---|---|---|
| Nicrevice-corrosion alloying with Ru | 0.4 – 0.6 | 0.5 |
| Rucathodic modifier, raises repassivation | 0.04 – 0.06 | 0.05 |
| Omain strengthener; highest of Gr.13/14/15 | ≤ 0.25 | 0.2 |
| Fe | ≤ 0.3 | 0.15 |
| C | ≤ 0.08 | 0.02 |
| N | ≤ 0.03 | 0.01 |
| H0.0125% max for bar/billet per B348 | ≤ 0.02 | 0.01 |
| Residuals (each)total residuals 0.40 max | ≤ 0.1 | |
| Ti | balance |
What surface finishes work on Ti Grade 15?
Pickle in HNO3/HF after hot work to remove alpha case; colour anodizing per AMS 2488 for ID, and use anti-galling coatings or dissimilar mating materials on threads.
Surface treatments FabDigit runs on titanium parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Titanium Ti Grade 15 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- R53415
How much does Ti Grade 15 cost?
Ti Grade 15 is a high-cost titanium ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Ti Grade 15 — frequently asked
What is Ti Grade 15 used for?
Ti Grade 15 is typically used for structural chemical process components, pressure equipment and marine hardware. In short: strongest Ti-Ni-Ru grade; crevice corrosion plus strength; weldable, poorly formable.
What is the yield strength of Ti Grade 15?
Ti Grade 15 has a typical yield strength of 450 MPa (65.3 ksi) and a tensile strength of 550 MPa (79.8 ksi) — weaker than 65% of titanium grades. Strength varies by condition: see the 3 listed tempers.
Is Ti Grade 15 easy to machine?
Not especially — machinability is rated fair (35/100, better than 78% of titanium grades). Machine slow-speed/high-feed with rigid setups, sharp uncoated-carbide or coated tooling and flood chlorine-free coolant; avoid dwelling to prevent work hardening and fire risk from fine chips.
Can Ti Grade 15 be welded?
Yes — weldability is rated excellent (85/100). Excellent GTAW/PAW/EBW weldability with matching Gr.15 or Gr.2/Ru filler, provided the puddle and hot trailing zone are fully argon-shielded (back purge mandatory); keep straw/blue tint out of the joint.
What surface finishes work on Ti Grade 15?
Pickle in HNO3/HF after hot work to remove alpha case; colour anodizing per AMS 2488 for ID, and use anti-galling coatings or dissimilar mating materials on threads.
Can Ti Grade 15 be formed, bent or molded?
Cold bend to ≥3–4 t radius with generous springback allowance; warm forming at 200–350 °C greatly improves formability of this high-oxygen grade.
What is the maximum service temperature of Ti Grade 15?
Ti Grade 15 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 15 Annealed and Ti Grade 15 CW-SR?
Annealed is the default condition — standard stocked condition for pressure-vessel plate, heat-exchanger tube and machined parts in hot chloride service. CW-SR: choose for higher strength and tighter tolerance in cold-drawn bar, tubing and fasteners where ductility can be traded away. Yield strength is 450 MPa in Annealed versus 560 MPa in CW-SR.
How much does Ti Grade 15 cost?
Ti Grade 15 is a high-cost titanium ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- ASTM B265 — Titanium and Titanium Alloy Strip, Sheet, and Plate — ASTM International (2020)
- ASTM B338 — Seamless and Welded Titanium Tubes for Condensers and Heat Exchangers — ASTM International (2021)
- ASTM B348 — Titanium and Titanium Alloy Bars and Billets — ASTM International (2021)
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- Corrosion of Titanium and Titanium Alloys (ASM Handbook Vol.13B) — ASM International (2005)
- Ruthenium-enhanced corrosion-resistant titanium grades — TIMET / RTI (RMI Titanium) (2015)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.