Titanium Grade 26 Annealed
Temper · default condition
ASTM Grade 26 · UNS R52404
Take the default mill annealed plate, sheet, bar or tube for general corrosion-resistant equipment, balancing formability and weldability at 380 MPa yield and 26% elongation.
Values for the Annealed condition
Other Grade 26 tempers and conditions
Grade 26 is listed in 4 conditions; see the grade overview at Grade 26.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Forged and annealed | Specify forged and annealed material to ASTM B381 F26 for thick-wall pressure-retaining valve bodies, flanges and fittings, giving 375 MPa yield and 25% elongation. | 375 | 480 | 25 | 160 HB | 3.1 % IACS |
AnnealedDefaultThis page mill annealed sheet/plate/bar/tube | Take the default mill annealed plate, sheet, bar or tube for general corrosion-resistant equipment, balancing formability and weldability at 380 MPa yield and 26% elongation. | 380 | 485 | 26 | 160 HB | 3.1 % IACS |
Grade 26H | Select the 26H variant when pressure-vessel design needs a higher allowable stress yet the yield must stay inside a tightened 275-450 MPa band to protect forming and welding. | 390 | 500 | 25 | 165 HB | 3.1 % IACS |
Cold worked and stress relieved | Pick cold worked and stress relieved bar, wire or small tube for fasteners, pump shafts and instrument fittings needing 540 MPa yield and tight tolerances; elongation falls to 18%. | 540 | 620 | 18 | 15 HRC | 3 % IACS |
What is Grade 26 Annealed?
Grade 26 Annealed is Grade 26 in the Annealed temper — take the default mill annealed plate, sheet, bar or tube for general corrosion-resistant equipment, balancing formability and weldability at 380 MPa yield and 26% elongation. Grade 26 Annealed has a yield strength of 380 MPa (55.1 ksi) and a tensile strength of 485 MPa (70.3 ksi) — weaker than 73% of titanium grades. Elongation at break is 26% and the elastic modulus is 103 GPa (14.9 Msi). Grade 26 Annealed has a density of 4.51 g/cm³ (0.163 lb/in³), heavier than 57% of titanium grades. It melts at 1,660°C (3,020 °F).
Advantages
- Ductile — tolerates forming and impact — 26%, better than 86% of titanium grades
- High service temperature — 400°C (752 °F), better than 78% of titanium grades
- Easy to machine — 35/100, better than 78% of titanium grades
- Forms and bends easily — 72/100, better than 78% of titanium grades
- High electrical conductivity — 3.1 % IACS, better than 75% of titanium grades
Grade 26 Annealed properties
Typical room-temperature values for Grade 26 Annealed; 22 are specific to this condition. Other listed values are Grade 26 reference data and may not represent this condition. Bars are the position among titanium grades.
Physical3
Grade 26 Annealed has a density of 4.51 g/cm³ (0.163 lb/in³), heavier than 57% of titanium grades. It melts at 1,660°C (3,020 °F).
Mechanical16
Grade 26 Annealed has a yield strength of 380 MPa (55.1 ksi) and a tensile strength of 485 MPa (70.3 ksi) — weaker than 73% of titanium grades. Elongation at break is 26% and the elastic modulus is 103 GPa (14.9 Msi).
Thermal6
Grade 26 Annealed is rated for continuous service to 400°C (752 °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 8.6 µm/m·K (4.78 µin/in·°F).
Electrical3
Grade 26 Annealed 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 Grade 26 Annealed takes about 650 MJ of energy and emits 38 kg of CO₂ — less than 75% of titanium grades. Typical recycled content is 25%.
Manufacturability8
Grade 26 Annealed's machinability is fair (35/100, better than 78% of titanium grades); weldability excellent (85/100); formability very good (72/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Grade 26 Annealed
Is Grade 26 easy to machine?
Use low surface speed with high feed, rigid clamping, sharp carbide tooling and high-volume water-based coolant to limit friction heat and built-up edge. Chips are flammable, so keep swarf clear of the cutting zone.
Can Grade 26 be welded?
GTAW, PAW and EBW are all suitable, but inert-gas or vacuum protection with a trailing shield and back purge is mandatory and the bead must be bright silver. No preheat or post-weld heat treatment is required; matching Grade 26 or Grade 2 filler wire can be used.
Can Grade 26 be formed, bent or molded?
Cold formability equals Grade 2 titanium: bend radii should be at least 2–3t and springback is high. Warm-form complex parts at 200–400 °C and stress-relief anneal at 480–595 °C after forming.
What surface finishes work on Grade 26?
Pickle in nitric–hydrofluoric acid to remove scale, then polish or colour anodize. Avoid iron contamination and residual chlorides; anodizing or solid-film lubricant at assembly prevents galling.
Grade 26 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 |
|---|---|---|
| Ruruthenium, cathodic depolarizing element | 0.08 – 0.14 | 0.1 |
| Fe | ≤ 0.3 | 0.15 |
| Omain interstitial element controlling strength | ≤ 0.25 | 0.15 |
| C | ≤ 0.08 | 0.02 |
| N | ≤ 0.03 | 0.01 |
| Hsheet/bar limit; varies slightly with product form | ≤ 0.02 | 0.01 |
| Residuals (each)each other element ≤ 0.1, total ≤ 0.4 | ≤ 0.1 | — |
| Ti | balance | — |
Grade 26 Annealed — frequently asked
What is Grade 26 Annealed used for?
Grade 26 Annealed is typically used for chemical processing vessels and piping, flue gas desulfurization internals, heat exchanger tube bundles, hydrometallurgical autoclave components, brine and seawater handling hardware and acid service valve and pump bodies. In short: palladium-free crevice resistance; direct Grade 16 replacement; 400 °C service CP titanium.
What is the yield strength of Grade 26 Annealed?
Grade 26 Annealed has a typical yield strength of 380 MPa (55.1 ksi) and a tensile strength of 485 MPa (70.3 ksi) — weaker than 73% of titanium grades. Strength varies by condition: see the 4 listed tempers.
Is Grade 26 Annealed easy to machine?
Not especially — machinability is rated fair (35/100, better than 78% of titanium grades). Use low surface speed with high feed, rigid clamping, sharp carbide tooling and high-volume water-based coolant to limit friction heat and built-up edge. Chips are flammable, so keep swarf clear of the cutting zone.
Can Grade 26 Annealed be welded?
Yes — weldability is rated excellent (85/100). GTAW, PAW and EBW are all suitable, but inert-gas or vacuum protection with a trailing shield and back purge is mandatory and the bead must be bright silver. No preheat or post-weld heat treatment is required; matching Grade 26 or Grade 2 filler wire can be used.
What surface finishes work on Grade 26 Annealed?
Pickle in nitric–hydrofluoric acid to remove scale, then polish or colour anodize. Avoid iron contamination and residual chlorides; anodizing or solid-film lubricant at assembly prevents galling.
Can Grade 26 Annealed be formed, bent or molded?
Cold formability equals Grade 2 titanium: bend radii should be at least 2–3t and springback is high. Warm-form complex parts at 200–400 °C and stress-relief anneal at 480–595 °C after forming.
What is the maximum service temperature of Grade 26 Annealed?
Grade 26 Annealed is rated for continuous use to about 400°C (752 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Grade 26 Annealed and Grade 26 CW-SR?
Annealed is the default condition — take the default mill annealed plate, sheet, bar or tube for general corrosion-resistant equipment, balancing formability and weldability at 380 MPa yield and 26% elongation. CW-SR: pick cold worked and stress relieved bar, wire or small tube for fasteners, pump shafts and instrument fittings needing 540 MPa yield and tight tolerances; elongation falls to 18%. Yield strength is 380 MPa in Annealed versus 540 MPa in CW-SR.
Sources
- ASTM B265 — Titanium and Titanium Alloy Strip, Sheet, and Plate (Grade 26/26H) — ASTM International (2023)
- ASTM B348 / B348M — Titanium and Titanium Alloy Bars and Billets — ASTM International (2021)
- ASTM B338 — Seamless and Welded Titanium Alloy Tubes for Condensers and Heat Exchangers — ASTM International (2022)
- ASTM B381 — Titanium and Titanium Alloy Forgings (F26) — ASTM International (2019)
- ASTM B861 / B862 — Titanium Seamless and Welded Pipe — ASTM International (2022)
- ASM Handbook Vol.2 — Properties of Nonferrous Alloys (Titanium) — ASM International (1990)
- Ruthenium-enhanced titanium (Ti-0.1Ru) corrosion and mechanical data — TIMET / ATI (2020)
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.