Titanium Ti Grade 27 CW-SR
Supply condition
UNS R52254
CW-SR = cold Worked + Stress Relieved
Pick when higher strength and tighter tolerance/straightness are needed and remaining ductility of ~15 % is acceptable.
Values for the CW-SR condition
Other Ti Grade 27 tempers and conditions
Ti Grade 27 is listed in 4 conditions; see the grade overview at Ti Grade 27.
Compare all 4 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: maximum ductility and formability, minimum strength; choose for cladding, tube, deep-drawn and roll-formed corrosion parts. | 230 | 330 | 32 | 120 HB | — |
Forgings | For valve bodies, flanges and pump parts machined from closed-die or open-die forgings in Ru-enhanced CP Ti. | 230 | 330 | 30 | 120 HB | 3.4 % IACS |
Hot rolled | Economical condition for heavy plate and large bar where full anneal is not required; slightly higher strength, coarser surface. | 265 | 360 | 28 | 130 HB | 3.4 % IACS |
CW-SRThis page Cold Worked + Stress Relieved | Pick when higher strength and tighter tolerance/straightness are needed and remaining ductility of ~15 % is acceptable. | 380 | 450 | 16 | 170 HB | — |
What is Ti Grade 27 CW-SR?
Ti Grade 27 CW-SR is Ti Grade 27 supplied in the CW-SR condition — pick when higher strength and tighter tolerance/straightness are needed and remaining ductility of ~15 % is acceptable. Ti Grade 27 CW-SR has a yield strength of 380 MPa (55.1 ksi) and a tensile strength of 450 MPa (65.3 ksi) — weaker than 73% of titanium grades. Elongation at break is 16% and the elastic modulus is 103 GPa (14.9 Msi). Ti Grade 27 CW-SR 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). Annealed is the default condition FabDigit quotes; CW-SR is available on request or by drawing note.
Advantages
- Easy to machine — 48/100, better than 101% of titanium grades
- Conducts heat well — 20.8 W/m·K (12 BTU/hr·ft·°F), better than 100% of titanium grades
- Low embodied carbon — 36 kg CO₂/kg, better than 98% of titanium grades
- High electrical conductivity — 3.4 % IACS, better than 96% of titanium grades
- Tough — resists crack growth — 80 MPa·√m (72.8 ksi·√in), better than 81% of titanium grades
Limitations
- Limited service temperature — 250°C (482 °F), worse than 99% of titanium grades
Ti Grade 27 CW-SR properties
Typical room-temperature values for Ti Grade 27 CW-SR; 13 are specific to this condition. Other listed values are Ti Grade 27 reference data and may not represent this condition. Bars are the position among titanium grades.
Physical3
Ti Grade 27 CW-SR 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
Ti Grade 27 CW-SR has a yield strength of 380 MPa (55.1 ksi) and a tensile strength of 450 MPa (65.3 ksi) — weaker than 73% of titanium grades. Elongation at break is 16% and the elastic modulus is 103 GPa (14.9 Msi).
Thermal6
Ti Grade 27 CW-SR is rated for continuous service to 250°C (482 °F). It conducts heat at 20.8 W/m·K (12 BTU/hr·ft·°F), better than 100% of titanium grades. Thermal expansion is 8.6 µm/m·K (4.78 µin/in·°F).
Electrical3
Ti Grade 27 CW-SR conducts electricity at 3.4 % IACS, better than 96% of titanium grades.
Chemical & Environmental3
Corrosion resistance is excellent (93/100), better than 72% of titanium grades.
Sustainability4
Producing a kilogram of Ti Grade 27 CW-SR takes about 650 MJ of energy and emits 36 kg of CO₂ — less than 75% of titanium grades. Typical recycled content is 25%.
Manufacturability8
Ti Grade 27 CW-SR's machinability is fair (48/100, better than 101% of titanium grades); weldability excellent (85/100); formability good (55/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Ti Grade 27 CW-SR
Is Ti Grade 27 easy to machine?
Machine like CP titanium: rigid setup, sharp uncoated-carbide or PVD-coated tools, low surface speed (25–50 m/min), heavy feed and flood coolant to avoid galling, work-hardening and chip fires.
Can Ti Grade 27 be welded?
Excellent GTAW/plasma/EB/resistance weldability with high-purity argon shielding of torch, trailing and back side; keep weld metal bright silver, no filler needed for autogenous seams or use ERTi-1/ERTi-27 filler.
Can Ti Grade 27 be formed, bent or molded?
Best cold formability of the Ru grades — deep drawing, roll forming and bending to ~2T possible at room temperature; allow generous springback or warm form at 200–300 °C for tight radii.
What surface finishes work on Ti Grade 27?
Pickle in HNO₃/HF to remove alpha case and scale after hot work; colour anodize (AMS 2488 Type II) or oxide-passivate for ID and galling control; never use chloride-heavy or mercury-bearing cleaners.
Ti Grade 27 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 addition for crevice-corrosion resistance | 0.08 – 0.14 | 0.1 |
| Fe | ≤ 0.2 | 0.08 |
| OGrade 1 oxygen level — governs strength | ≤ 0.18 | 0.1 |
| C | ≤ 0.08 | 0.02 |
| N | ≤ 0.03 | 0.01 |
| H0.015 % max for sheet/plate; lower limits apply to some forms | ≤ 0.02 | 0.01 |
| Residuals (each)total residuals 0.4 % max | ≤ 0.1 | — |
| Ti | balance | — |
Ti Grade 27 CW-SR — frequently asked
What is Ti Grade 27 CW-SR used for?
Ti Grade 27 CW-SR is typically used for deep-drawn chemical process equipment, desalination components, vessel cladding and liners, thin-wall welded tubing, expansion bellows and diaphragms and heat exchanger tubesheet facings. In short: most formable ruthenium grade; economical Grade 17 substitute; low strength, high ductility.
What is the yield strength of Ti Grade 27 CW-SR?
Ti Grade 27 CW-SR has a typical yield strength of 380 MPa (55.1 ksi) and a tensile strength of 450 MPa (65.3 ksi) — weaker than 73% of titanium grades. Strength varies by condition: see the 4 listed tempers.
Is Ti Grade 27 CW-SR easy to machine?
Reasonably — machinability is rated fair (48/100, better than 101% of titanium grades). Machine like CP titanium: rigid setup, sharp uncoated-carbide or PVD-coated tools, low surface speed (25–50 m/min), heavy feed and flood coolant to avoid galling, work-hardening and chip fires.
Can Ti Grade 27 CW-SR be welded?
Yes — weldability is rated excellent (85/100). Excellent GTAW/plasma/EB/resistance weldability with high-purity argon shielding of torch, trailing and back side; keep weld metal bright silver, no filler needed for autogenous seams or use ERTi-1/ERTi-27 filler.
What surface finishes work on Ti Grade 27 CW-SR?
Pickle in HNO₃/HF to remove alpha case and scale after hot work; colour anodize (AMS 2488 Type II) or oxide-passivate for ID and galling control; never use chloride-heavy or mercury-bearing cleaners.
Can Ti Grade 27 CW-SR be formed, bent or molded?
Best cold formability of the Ru grades — deep drawing, roll forming and bending to ~2T possible at room temperature; allow generous springback or warm form at 200–300 °C for tight radii.
What is the maximum service temperature of Ti Grade 27 CW-SR?
Ti Grade 27 CW-SR is rated for continuous use to about 250°C (482 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Ti Grade 27 Annealed and Ti Grade 27 CW-SR?
Annealed is the default condition — standard stocked condition: maximum ductility and formability, minimum strength; choose for cladding, tube, deep-drawn and roll-formed corrosion parts. CW-SR: pick when higher strength and tighter tolerance/straightness are needed and remaining ductility of ~15 % is acceptable. Yield strength is 230 MPa in Annealed versus 380 MPa in CW-SR.
Sources
- ASTM B265 — Titanium and Titanium Alloy Strip, Sheet, and Plate (Grade 27) — ASTM International (2020)
- ASTM B348 — Titanium and Titanium Alloy Bars and Billets — ASTM International (2021)
- ASTM B338 / B861 / B862 — Titanium Tube and Pipe — ASTM International (2022)
- ASTM B381 — Titanium and Titanium Alloy Forgings — ASTM International (2019)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- Corrosion Resistance of Titanium (Ru- and Pd-enhanced grades) — ASM International / producer technical bulletin (2013)
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.