Commercially Pure Grade 4
UNS R50700W.Nr 3.7065Ti4 / Ti99.5
Request a quote for Commercially Pure Grade 4CP Grade 4 is the highest strength unalloyed titanium, reaching roughly 80 ksi tensile through controlled higher oxygen. It keeps the corrosion resistance of pure titanium while approaching the strength of some alloyed grades.
It is common in medical implants and instruments, fittings, fasteners and structural hardware where an alloy addition is not wanted.
Stocked in sheet, plate, bar, wire and tube.
Sizes and stock
- Round bar: up to 10" DIA
- Coil / sheet / plate: up to 2.5" THK
Processing capabilities
- Billet conversion into custom bar, plate, ring and shaped product
- Open die, closed die, ring and near-net forging
- Anneal, solution treat and age, plus stress relief
- Ultrasonic, penetrant dye and chemical assay verification
Specifications
Material is released to the applicable specification with mill test reports and, on request, independent lab verification.
Why engineers specify Commercially Pure Grade 4
- Highest strength commercially pure titanium
- Corrosion resistance of unalloyed titanium
- Widely accepted in medical implant applications
- No alloying additions to complicate biocompatibility
Nominal chemistry
Percent by weight, nominal composition per the governing specification. The mill test report for your heat is the controlling document.
Typical mechanical properties
| Condition | Tensile strength | Yield strength | Elongation | Hardness |
|---|---|---|---|---|
| Annealed | 80 ksi min | 70-95 ksi | 15% min | - |
Typical published values for reference only, not for design. Properties vary with section size, product form and processing. Order to the specification and condition your drawing requires.
Typical applications
- Medical implants and instruments
- Fittings and fasteners
- Airframe hardware
- Pressure components
Fabrication notes
Machining
Titanium runs at low surface speed with heavy positive feed, sharp tooling, rigid fixturing and high volume coolant. Dwelling glazes the surface and work hardens it. Chips are combustible, so manage swarf. We can supply rough machined, saw cut, waterjet or near net blanks to cut down the metal removed.
Welding
Readily weldable by GTAW, plasma, electron beam and laser processes with full inert gas shielding of the pool, root and cooling weld. Contamination shows up as colour on the bead and as embrittlement, so shielding and cleanliness govern the result.
Forming
Cold formability is limited compared with steel, so hot forming, generous bend radii and stress relief after forming are normal practice. Surfaces must be clean of iron pickup before heat treatment.
Commercially Pure Grade 4 compared with similar grades
CP Grade 2
Far more formable at substantially lower strength.
Ti 6Al-4V ELI
Higher strength implant alloy with alloying additions.
Designations and cross reference
- Material family
- Titanium & Titanium Alloys
- UNS number
- R50700
- Werkstoff (W.Nr)
- 3.7065
- EN designation
- Ti4 / Ti99.5
Working from an obsolete, foreign or superseded designation? Send it over and we will cross reference it to a current grade and specification.
Quality, testing and traceability
Supplied with mill test reports, melt traceability, and ultrasonic inspection, penetrant dye, chemical assay, microstructure and mechanical testing available on request.
We are AS9100D and ISO 9001:2015 registered. If our stock does not already carry the inspection your specification requires, we can quote the material with that work performed. More on our quality system
Available forms
Custom sizes converted from billet, plus saw cut, waterjet and near-net blanks. See custom conversions
Commercially Pure Grade 4 frequently asked questions
What is Commercially Pure Grade 4?
CP Grade 4 is the highest strength unalloyed titanium, reaching roughly 80 ksi tensile through controlled higher oxygen. It keeps the corrosion resistance of pure titanium while approaching the strength of some alloyed grades.
What forms is Commercially Pure Grade 4 available in?
We supply Commercially Pure Grade 4 in bar, coil, sheet, plate. Custom sizes are converted from billet, and we can provide saw cut, waterjet or near net blanks so material arrives closer to your finished part.
What is the UNS or equivalent designation for Commercially Pure Grade 4?
Commercially Pure Grade 4 is designated UNS R50700, Werkstoff 3.7065, EN Ti4 / Ti99.5. If your drawing calls out an obsolete or foreign designation we can cross reference it and confirm the equivalent before you order.
What specifications can Commercially Pure Grade 4 be supplied to?
Commonly ordered specifications include AMS 4921, AMS 4901, ASTM B265, ASTM B348, UNS R50700. Material is released to the specification and condition on your purchase order, with mill test reports supplied as standard.
What conditions can Commercially Pure Grade 4 be ordered in?
We can supply Annealed. If our stock is not already in the condition you need, we can quote it with the heat treatment performed before shipment.
Can you cut Commercially Pure Grade 4 to size?
Yes. Saw cutting, waterjet, laser and shearing are available, along with trepanning, gun drilling, lathe turning and CNC machining, so you can order blanks or rough machined pieces rather than full lengths.
Do you provide test reports and additional testing on Commercially Pure Grade 4?
Every order ships with mill test reports and heat traceability. If your print calls for ultrasonic inspection, penetrant dye, magnetic particle, chemical assay, micrography, hardness or mechanical testing and our stock does not already carry it, we can quote the material with that work performed.
Can Commercially Pure Grade 4 be supplied to DFARS domestic melt requirements?
Tell us at quote stage if the order is DFARS or domestic melt restricted and we will confirm availability against that requirement before you commit.
What do you need to quote Commercially Pure Grade 4?
Grade, form, dimensions, quantity, specification and condition, plus any testing or certification requirements and the date you need it. Send a drawing if you have one. Quotes are typically ready within 24 hours.
How does Commercially Pure Grade 4 compare with CP Grade 2?
Far more formable at substantially lower strength.