Bar and Rod
Plate and Sheet
Strip
Pipe and Tube
Wire
Welding
Powder Material
Cast Products
Forged Products
Fittings
Fastening
Round Bar:
φ2–500 mm, 1–6 m length
Flat/Square Bar:
4–100 mm thickness/width
Hex Bar:
A/F 3–100 mm
Hollow Bar:
OD 20–300 mm
Sheet:
0.3–6 mm thickness
Medium Plate:
6–25 mm thickness
Heavy Plate:
25–100 mm thickness
Standard Strip:
0.05–3 mm thick,
10–600 mm wide
Precision strip:
0.01–0.5 mm thick,
tight tolerance ±0.005 mm
Foil:
0.005–0.1 mm thick
Seamless Tube:
OD 6–450 mm,
WT 1–50 mm,
1–12 m length
Welded Tube:
OD 10–600 mm,
WT 1–20 mm
Capillary Tube:
OD 1–10 mm,
WT 0.1–2 mm
Wire Form:
Cold Drawn Wire,
Bright Wire,
Spring Wire,
Fine Wire,
Ultra-fine Wire
General Diameter:
φ0.1–10 mm
Coil Weight:
50–500 kg,
customizable tolerance
Solid Wire:
φ0.8–4.0 mm
Flux-cored Wire:
φ1.2–4.0 mm
Welding Rod:
φ2.0–5.0 mm
Powder Form:
AM 3D Printing Powder,
Spherical Powder,
Gas-atomized Powder,
Water-atomized Powder
Particle Size:
10–150 μm
Sphericity:
≥90% for AM grade
Cast Ingot:
φ200–800 mm
Precision Casting:
min wall 0.5 mm
Cast Pipe:
OD 100–600 mm,
WT 10–50 mm
Forged Bar:
Φ35–500 mm
Forged Ring:
OD 200–2000 mm
Forging Weight:
1–5000 kg
Fittings Form:
Elbow, Tee, Reducer, Flange, Cap, Outlet, Lap Joint
Size range:
1/2''–24'' (DN15–DN600)
Wall thickness:
Sch10–Sch160, STD, XS, XXS
Pressure Class:
150–2500 LB
Fastening Form:
Bolt, Nut, Screw, Stud, Washer, Pin, Rivet
Metric: M3–M64
Imperial: #4–2.5''
Length: 6–500 mm
R50550 is a medium-to-high-strength member of the commercially pure (unalloyed) titanium grades. This datasheet presents the material within the American (ASTM / ASME / UNS) standard system.
With a minimum titanium content of about 99.0% and higher interstitial (oxygen and iron) content than Grade 2, R50550 offers higher strength than Grades 1 and 2 while retaining similar ductility and formability. It carries the highest ASME allowable design stresses of any commercially pure titanium grade, positioning it between Grade 2 and the alloyed titanium grades. It combines this with the excellent corrosion resistance characteristic of titanium — a stable, self-healing oxide film gives high resistance to seawater, chlorides, nitric acid and many oxidizing media — together with good weldability and excellent biocompatibility.
Typical applications include plate heat exchangers and condenser tubing, deep-drawn and severely formed components, chemical and marine equipment, cryogenic vessels, cathodic-protection anodes, and medical implants and surgical instruments.
| Property | Value | Unit |
|---|---|---|
| Density | 4.51 | g/cm³ |
| Melting point | 1670 | °C |
| Elastic modulus | 103 | GPa |
| Coefficient of thermal expansion (20–100 °C) | 8.6 | µm/m·°C |
| Thermal conductivity (20 °C) | 16 | W/m·K |
| Specific heat (20 °C) | 523 | J/kg·K |
| Structure | Alpha (hexagonal close-packed) | — |
| Element | Symbol | Min % | Max % | Role in Alloy |
|---|---|---|---|---|
| Titanium | Ti | Balance | — | Base element (≥99.0%) |
| Oxygen | O | — | 0.35 | Interstitial; strength vs ductility |
| Iron | Fe | — | 0.30 | Residual; standard CP level |
| Carbon | C | — | 0.08 | Interstitial impurity |
| Nitrogen | N | — | 0.05 | Interstitial impurity |
| Hydrogen | H | — | 0.015 | Interstitial impurity |
Annealed condition, per ASTM B265 for UNS R50550.
| Condition | Property | Value |
|---|---|---|
| Annealed | Tensile strength (UTS) | ≥450 MPa (65 ksi) |
| Annealed | 0.2% yield strength | 380–550 MPa (55–80 ksi) |
| Annealed | Elongation at break | ≥18 % |
| Annealed | Hardness | ~200 HB |
| — | Elastic modulus | 103 GPa |
Confirm against the mill test report. Properties cannot be increased by heat treatment; cold work raises strength.
| Environment | Performance | Notes |
|---|---|---|
| Seawater / marine | Excellent | Self-healing oxide film |
| Chlorides / brine | Excellent | Resists pitting and crevice attack |
| Oxidizing acids (e.g. nitric) | Excellent | Stable passive film |
| Reducing acids | Limited | Less resistant than in oxidizing media |
| Chloride stress-corrosion cracking | Excellent | Highly resistant |
The protective titanium-oxide film gives excellent resistance to seawater, chlorides and oxidizing media; resistance is lower in strongly reducing acids unless inhibited.
A commercially pure (alpha) titanium; not hardenable by heat treatment. Properties are set by annealing and cold work.
Anneal Anneal at approximately 650–760 °C and air cool to relieve stress and restore ductility after cold work. Protect from oxygen, nitrogen and hydrogen pickup at temperature; avoid hydrogen-bearing atmospheres.
Excellent weldability with inert-gas processes; the weld must be fully shielded (including the root and cooling weld) from atmospheric contamination, which causes embrittlement.
| Welding Process | Applicability | Filler / Consumable |
|---|---|---|
| GTAW / TIG | Excellent | AWS A5.16 ERTi-3 (matching) |
| GMAW / MIG | Good | ERTi-3 |
| Resistance / spot | Good | — |
Use full inert-gas shielding and clean, contamination-free surfaces; avoid hydrogen, oxygen and nitrogen pickup.
Machining Guidelines
| Parameter | Recommendation |
|---|---|
| Machinability | Moderate; sharp tools, low speed, high feed |
| Work hardening | Low for CP titanium; avoid galling |
| Coolant | Generous non-chlorinated coolant |
Forming Processes
| Process | Notes |
|---|---|
| Cold forming | Excellent — deep drawing, severe bending, stamping |
| Hot forming | ~600–800 °C; protect from contamination; anneal afterward |
| Industry | Typical Components | Key Requirements |
|---|---|---|
| Heat transfer | Plate heat exchangers, condenser tubing | Formability + corrosion resistance |
| Chemical / marine | Pickling baskets, tanks, harsh-environment parts | Corrosion resistance |
| Medical | Implants, surgical instruments | Biocompatibility + formability |
| Aerospace / cryogenic | Airframe and honeycomb parts, cryogenic vessels | Toughness + formability |
| Product Form | ASTM Standard | ASME Code |
|---|---|---|
| Sheet, strip and plate | ASTM B265 | ASME SB-265 |
| Bar and billet | ASTM B348 | ASME SB-348 |
| Seamless / welded tube | ASTM B338 | ASME SB-338 |
| Welding wire | AWS A5.16 ERTi-3 | — |
Commercially pure (unalloyed) titanium, medium-oxygen higher-strength grade. UNS R50550.
| UNS | Ti % | O max % | Fe max % | Best Used For |
|---|---|---|---|---|
| R50550 | ≥99.0 | 0.35 | 0.30 | Higher-strength CP titanium; highest ASME design stress |
| R50250 | ≥99.1 | 0.18 | 0.20 | Softest CP titanium; max formability (Grade 1) |
| R50400 | ≥99.0 | 0.25 | 0.30 | Workhorse CP titanium; best overall balance (Grade 2) |
| R50700 | ≥98.9 | 0.40 | 0.50 | Strongest CP titanium (Grade 4) |
| R52400 | ≥98.9 | 0.25 | 0.30 | CP titanium + Pd; enhanced acid resistance (Grade 7) |
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