Titanium ERTi-9 CWSR
Heat-treated state
UNS R56320 · ASTM B863 ERTi-9
CWSR = cold worked and stress relieved wire
Higher-strength, stiffer wire condition sometimes specified for cut-length rods that must resist bending or for matching CWSR Gr.9 tubing chemistry.
Values for the CWSR condition
Other ERTi-9 tempers and conditions
ERTi-9 is listed in 4 conditions; see the grade overview at ERTi-9.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Standard supply condition of the filler wire itself — soft, straight-cut TIG rod or level-wound spool for orbital/GMAW feeding. | 550 | 660 | 20 | 24 HRC | — |
as-welded then stress relieved (480–595 °C, vacuum/inert) | Pick when residual stress or distortion in welded Gr.9 tube assemblies must be reduced without softening the joint. | 570 | 680 | 17 | 23 HRC | 1.4 % IACS |
AWDefault As-welded deposit | Default condition: all-weld-metal properties of ERTi-9 deposited with argon/helium shielding, trailing shield and back purge. | 585 | 690 | 15 | 25 HRC | — |
CWSRThis page Cold worked and stress relieved wire | Higher-strength, stiffer wire condition sometimes specified for cut-length rods that must resist bending or for matching CWSR Gr.9 tubing chemistry. | 790 | 900 | 12 | 31 HRC | 1.4 % IACS |
What is ERTi-9 CWSR?
ERTi-9 CWSR is ERTi-9 heat treated to CWSR — higher-strength, stiffer wire condition sometimes specified for cut-length rods that must resist bending or for matching CWSR Gr.9 tubing chemistry. ERTi-9 CWSR has a yield strength of 790 MPa (115 ksi) and a tensile strength of 900 MPa (131 ksi) — stronger than 55% of titanium grades. Elongation at break is 12% and the elastic modulus is 105 GPa (15.2 Msi). ERTi-9 CWSR 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). AW is the default condition FabDigit quotes; CWSR is available on request or by drawing note.
Limitations
- Low fracture toughness — 55 MPa·√m (50.1 ksi·√in), worse than 90% of titanium grades
- Limited ductility — 12%, worse than 78% of titanium grades
ERTi-9 CWSR properties
Typical room-temperature values for ERTi-9 CWSR; 22 are specific to this condition. Other listed values are ERTi-9 reference data and may not represent this condition. Bars are the position among titanium grades.
Physical3
ERTi-9 CWSR 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
ERTi-9 CWSR has a yield strength of 790 MPa (115 ksi) and a tensile strength of 900 MPa (131 ksi) — stronger than 55% of titanium grades. Elongation at break is 12% and the elastic modulus is 105 GPa (15.2 Msi).
Thermal6
ERTi-9 CWSR is rated for continuous service to 300°C (572 °F). It conducts heat at 7.6 W/m·K (4.39 BTU/hr·ft·°F), worse than 59% of titanium grades. Thermal expansion is 9.4 µm/m·K (5.22 µin/in·°F).
Electrical3
ERTi-9 CWSR conducts electricity at 1.4 % IACS, better than 53% of titanium grades.
Chemical & Environmental3
Corrosion resistance is excellent (90/100), worse than 63% of titanium grades.
Sustainability4
Producing a kilogram of ERTi-9 CWSR takes about 650 MJ of energy and emits 45 kg of CO₂ — less than 75% of titanium grades. Typical recycled content is 15%.
Manufacturability7
ERTi-9 CWSR's machinability is poor (22/100, worse than 55% of titanium grades); weldability excellent (88/100); formability fair (45/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with ERTi-9 CWSR
Is ERTi-9 easy to machine?
Weld beads machine like Gr.9 base metal — low speed, high feed, sharp uncoated-carbide or PVD-coated tools and flood coolant to avoid galling and work hardening.
Can ERTi-9 be welded?
GTAW/GMAW/PAW/orbital with 99.995% Ar or Ar-He, trailing shield and full back purge; joint and wire must be degreased and kept below ~250 ppm O pickup — a silver/straw bead is acceptable, blue/grey/white is not.
Can ERTi-9 be formed, bent or molded?
Annealed wire bends and coils readily; drawn-to-size rod is straightened and cut, and welded Gr.9 tube can be cold bent to about 3–4 D after PWHT.
What surface finishes work on ERTi-9?
Pickle in HNO₃-HF or bead blast to remove alpha case and heat tint before service; colour anodising and passivation per ASTM F86 give good corrosion and ID marking.
ERTi-9 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 | 2.5 – 3.5 | 3 |
| V | 2 – 3 | 2.5 |
| Fe | ≤ 0.25 | 0.15 |
| Okept low for weld ductility | ≤ 0.12 | 0.08 |
| C | ≤ 0.05 | 0.02 |
| N | ≤ 0.02 | 0.01 |
| Hsome purchase specs restrict to 0.008 max | ≤ 0.02 | 0.01 |
| Other, each | ≤ 0.05 | — |
| Other, total | ≤ 0.3 | — |
| Ti | balance | — |
ERTi-9 CWSR — frequently asked
What is ERTi-9 CWSR used for?
ERTi-9 CWSR is typically used for aerospace hydraulic and pneumatic tubing welds, bicycle frame welding and racing exhaust systems. In short: standard Grade 9 tube filler; formability with added strength; orbital-weld friendly.
What is the yield strength of ERTi-9 CWSR?
ERTi-9 CWSR has a typical yield strength of 790 MPa (115 ksi) and a tensile strength of 900 MPa (131 ksi) — stronger than 55% of titanium grades. Strength varies by condition: see the 4 listed tempers.
Is ERTi-9 CWSR easy to machine?
Not especially — machinability is rated poor (22/100, worse than 55% of titanium grades). Weld beads machine like Gr.9 base metal — low speed, high feed, sharp uncoated-carbide or PVD-coated tools and flood coolant to avoid galling and work hardening.
Can ERTi-9 CWSR be welded?
Yes — weldability is rated excellent (88/100). GTAW/GMAW/PAW/orbital with 99.995% Ar or Ar-He, trailing shield and full back purge; joint and wire must be degreased and kept below ~250 ppm O pickup — a silver/straw bead is acceptable, blue/grey/white is not.
What surface finishes work on ERTi-9 CWSR?
Pickle in HNO₃-HF or bead blast to remove alpha case and heat tint before service; colour anodising and passivation per ASTM F86 give good corrosion and ID marking.
Can ERTi-9 CWSR be formed, bent or molded?
Annealed wire bends and coils readily; drawn-to-size rod is straightened and cut, and welded Gr.9 tube can be cold bent to about 3–4 D after PWHT.
What is the maximum service temperature of ERTi-9 CWSR?
ERTi-9 CWSR is rated for continuous use to about 300°C (572 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between ERTi-9-AW and ERTi-9 CWSR?
AW is the default condition — default condition: all-weld-metal properties of ERTi-9 deposited with argon/helium shielding, trailing shield and back purge. CWSR: higher-strength, stiffer wire condition sometimes specified for cut-length rods that must resist bending or for matching CWSR Gr.9 tubing chemistry. Yield strength is 585 MPa in AW versus 790 MPa in CWSR.
Sources
- AWS A5.16/A5.16M — Titanium and Titanium-Alloy Welding Electrodes and Rods — AWS (2013)
- ASTM B863 — Titanium and Titanium Alloy Wire — ASTM International (2022)
- ASTM B348 / B338 — Ti Grade 9 (UNS R56320) bar and tube requirements — ASTM International (2021)
- ASM Handbook Vol.2 — Properties of Nonferrous Alloys (Titanium) — ASM International (1990)
- ASM Handbook Vol.6 — Welding, Brazing and Soldering (Titanium) — ASM International (1993)
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.