Titanium Ti Grade 7 CW-SR
Supply condition
UNS R52400 · EN 3.7235 · GB TA9
CW-SR = cold worked and stress relieved
Choose when higher strength and tighter tolerance are needed in small tube, bar or wire while keeping Grade 7 corrosion performance.
Values for the CW-SR condition
Other Ti Grade 7 tempers and conditions
Ti Grade 7 is listed in 4 conditions; see the grade overview at Ti Grade 7.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AnnealedDefault mill annealed (ASTM B265/B338/B348 Grade 7) | Standard stocked condition for plate, sheet, tube and bar in corrosion service; best ductility and formability. | 320 | 400 | 25 | 150 HB | — |
Hot worked / as-forged | As-rolled or as-forged heavy sections and flanges where a subsequent full anneal is not specified. | 340 | 425 | 22 | 160 HB | 3.3 % IACS |
As-welded deposit | Property basis for welded tube/pipe and fabricated vessels welded with matching Ti-0.2Pd filler under full inert shielding. | 350 | 430 | 18 | 170 HB | 3.3 % IACS |
CW-SRThis page Cold worked and stress relieved | Choose when higher strength and tighter tolerance are needed in small tube, bar or wire while keeping Grade 7 corrosion performance. | 470 | 550 | 15 | 200 HB | — |
What is Ti Grade 7 CW-SR?
Ti Grade 7 CW-SR is Ti Grade 7 supplied in the CW-SR condition — choose when higher strength and tighter tolerance are needed in small tube, bar or wire while keeping Grade 7 corrosion performance. Ti Grade 7 CW-SR has a yield strength of 470 MPa (68.2 ksi) and a tensile strength of 550 MPa (79.8 ksi) — weaker than 62% of titanium grades. Elongation at break is 15% and the elastic modulus is 105 GPa (15.2 Msi). Ti Grade 7 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 — 45/100, better than 100% of titanium grades
- High electrical conductivity — 3.3 % IACS, better than 92% 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 7 CW-SR properties
Typical room-temperature values for Ti Grade 7 CW-SR; 12 are specific to this condition. Other listed values are Ti Grade 7 reference data and may not represent this condition. Bars are the position among titanium grades.
Physical3
Ti Grade 7 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 7 CW-SR has a yield strength of 470 MPa (68.2 ksi) and a tensile strength of 550 MPa (79.8 ksi) — weaker than 62% of titanium grades. Elongation at break is 15% and the elastic modulus is 105 GPa (15.2 Msi).
Thermal6
Ti Grade 7 CW-SR is rated for continuous service to 250°C (482 °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
Ti Grade 7 CW-SR conducts electricity at 3.3 % IACS, better than 92% of titanium grades.
Chemical & Environmental3
Corrosion resistance is excellent (97/100), better than 99% of titanium grades.
Sustainability4
Producing a kilogram of Ti Grade 7 CW-SR takes about 700 MJ of energy and emits 42 kg of CO₂ — more than 74% of titanium grades. Typical recycled content is 25%.
Manufacturability8
Ti Grade 7 CW-SR's machinability is fair (45/100, better than 100% of titanium grades); weldability very good (80/100); formability fair (45/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Ti Grade 7 CW-SR
Is Ti Grade 7 easy to machine?
Machine like CP Ti: low surface speed, heavy positive-rake sharp tools, rigid setup and flood coolant to avoid galling, work-hardening and chip fires.
Can Ti Grade 7 be welded?
Excellent GTAW/PAW/EBW weldability with matching ERTi-7 filler; requires full argon shielding of pool, root and hot trailing zone to prevent oxygen/hydrogen pickup.
Can Ti Grade 7 be formed, bent or molded?
Good cold formability with generous bend radii (2–3 t) and allowance for springback; warm forming 200–400 °C helps deep draws and hot-formed heads.
What surface finishes work on Ti Grade 7?
Pickle in HNO3/HF after hot work to remove alpha case; can be colour anodised, glass-bead blasted or polished — avoid iron contamination from carbon-steel tooling.
Ti Grade 7 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 |
|---|---|---|
| Pdcathodic depolariser; defines Grade 7 | 0.12 – 0.25 | 0.18 |
| Fe | ≤ 0.3 | 0.15 |
| Omain strengthener | ≤ 0.25 | 0.14 |
| C | ≤ 0.08 | 0.02 |
| N | ≤ 0.03 | 0.01 |
| H0.0125 max for some product forms | ≤ 0.02 | 0.01 |
| Other, eachresiduals | ≤ 0.1 | — |
| Other, totalresiduals | ≤ 0.4 | — |
| Ti | balance | — |
Ti Grade 7 CW-SR — frequently asked
What is Ti Grade 7 CW-SR used for?
Ti Grade 7 CW-SR is typically used for chemical process equipment in reducing acids, flue-gas desulfurization components, heat exchangers and seawater equipment with crevice risk. In short: highest corrosion resistance in family; palladium-stabilized crevice resistance; highest-cost CP grade.
What is the yield strength of Ti Grade 7 CW-SR?
Ti Grade 7 CW-SR has a typical yield strength of 470 MPa (68.2 ksi) and a tensile strength of 550 MPa (79.8 ksi) — weaker than 62% of titanium grades. Strength varies by condition: see the 4 listed tempers.
Is Ti Grade 7 CW-SR easy to machine?
Reasonably — machinability is rated fair (45/100, better than 100% of titanium grades). Machine like CP Ti: low surface speed, heavy positive-rake sharp tools, rigid setup and flood coolant to avoid galling, work-hardening and chip fires.
Can Ti Grade 7 CW-SR be welded?
Yes — weldability is rated very good (80/100). Excellent GTAW/PAW/EBW weldability with matching ERTi-7 filler; requires full argon shielding of pool, root and hot trailing zone to prevent oxygen/hydrogen pickup.
What surface finishes work on Ti Grade 7 CW-SR?
Pickle in HNO3/HF after hot work to remove alpha case; can be colour anodised, glass-bead blasted or polished — avoid iron contamination from carbon-steel tooling.
Can Ti Grade 7 CW-SR be formed, bent or molded?
Good cold formability with generous bend radii (2–3 t) and allowance for springback; warm forming 200–400 °C helps deep draws and hot-formed heads.
What is the maximum service temperature of Ti Grade 7 CW-SR?
Ti Grade 7 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 7 Annealed and Ti Grade 7 CW-SR?
Annealed is the default condition — standard stocked condition for plate, sheet, tube and bar in corrosion service; best ductility and formability. CW-SR: choose when higher strength and tighter tolerance are needed in small tube, bar or wire while keeping Grade 7 corrosion performance. Yield strength is 320 MPa in Annealed versus 470 MPa in CW-SR.
Sources
- ASTM B265 — Titanium and Titanium Alloy Strip, Sheet and Plate — ASTM International (2020)
- ASTM B348 — Titanium and Titanium Alloy Bars and Billets — ASTM International (2021)
- ASTM B338 — Seamless and Welded Titanium Tubes for Condensers and Heat Exchangers — ASTM International (2021)
- GB/T 3621 (TA9) — SAC (2022)
- 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)
- Titanium Grade 7 (Ti-0.2Pd) alloy datasheet — TIMET / Sandvik (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.