Commercially Pure Grade 3
UNS R50550W.Nr 3.7055Ti3 / Ti99.6
Request a quote for Commercially Pure Grade 3CP Grade 3 raises strength over Grade 2 through slightly higher oxygen and iron, while keeping the same excellent corrosion behaviour. The strength increase often allows a thinner wall in pressure rated vessels and piping.
It is specified in ASME pressure vessel work, marine hardware and structural applications where Grade 2 would not meet allowable stress.
Stocked in sheet, plate, bar and tube.
Sizes and stock
- Coil / sheet: up to .187"
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 3
- Higher strength than Grade 2 with equal corrosion resistance
- Allows thinner walls in pressure rated designs
- Weldable with standard titanium practice
- Common in ASME code applications
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 | 65 ksi min | 55-80 ksi | 18% 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
- Pressure vessels and piping
- Marine and offshore structure
- Chemical process hardware
- Airframe non critical structure
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 3 compared with similar grades
CP Grade 2
More formable, lower strength, more widely stocked.
CP Grade 4
Highest CP strength for fittings and fasteners.
Designations and cross reference
- Material family
- Titanium & Titanium Alloys
- UNS number
- R50550
- Werkstoff (W.Nr)
- 3.7055
- EN designation
- Ti3 / Ti99.6
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 3 frequently asked questions
What is Commercially Pure Grade 3?
CP Grade 3 raises strength over Grade 2 through slightly higher oxygen and iron, while keeping the same excellent corrosion behaviour. The strength increase often allows a thinner wall in pressure rated vessels and piping.
What forms is Commercially Pure Grade 3 available in?
We supply Commercially Pure Grade 3 in coil, sheet. 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 3?
Commercially Pure Grade 3 is designated UNS R50550, Werkstoff 3.7055, EN Ti3 / Ti99.6. 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 3 be supplied to?
Commonly ordered specifications include AMS 4900, ASTM B265, ASTM B348, UNS R50550. 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 3 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 3 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 3?
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 3 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 3?
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 3 compare with CP Grade 2?
More formable, lower strength, more widely stocked.