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
3.7055 is the German material number for commercially pure (unalloyed) titanium, a medium-to-high-strength grade. This datasheet presents the material within the Werkstoff-Nummer (DIN / EN) designation system.
With a titanium content of about 99.3% and a medium interstitial (oxygen and iron) content, 3.7055 offers higher strength than the lower-oxygen grades while retaining similar ductility and formability, combined with an excellent strength-to-density ratio. It is moderately stronger than the workhorse grade and is positioned between the workhorse grade and the alloyed titanium grades. The stable, self-healing oxide film gives high resistance to seawater, chlorides and oxidizing media, and the material is readily welded and highly biocompatible.
Typical applications include plate heat exchangers and tube plates, deep-drawn and severely formed components, chemical and marine equipment, and weight-saving structural components.
| 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 (≈99.3%) |
| Oxygen | O | — | 0.30 | Interstitial; strength vs ductility |
| Iron | Fe | — | 0.25 | Residual; standard level |
| Carbon | C | — | 0.06 | Interstitial impurity |
| Nitrogen | N | — | 0.05 | Interstitial impurity |
| Hydrogen | H | — | 0.013 | Interstitial impurity |
Annealed condition, per DIN 17850 / EN reference data for W.Nr. 3.7055.
| Condition | Property | Value |
|---|---|---|
| Annealed | Tensile strength (Rm) | 460–590 MPa |
| Annealed | 0.2% proof strength (Rp0.2) | ≥320 MPa |
| Annealed | Elongation (A5) | ≥18 % |
| Annealed | Hardness | ~200 HV |
| — | Elastic modulus | 103 GPa |
Values per DIN 17850; not hardenable by heat treatment. Confirm against the inspection certificate (EN 10204).
| 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 cool in air to relieve stress and restore ductility after cold work. Protect from oxygen, nitrogen and hydrogen pickup at temperature.
Excellent weldability with inert-gas processes; the weld pool and cooling weld must be fully shielded from atmospheric contamination, which causes embrittlement.
| Welding Process | Applicability | Filler / Consumable |
|---|---|---|
| GTAW / TIG | Excellent | Matching commercially pure titanium filler |
| GMAW / MIG | Good | Matching filler |
| 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, tube plates | Formability + corrosion resistance |
| Chemical / marine | Tanks, harsh-environment parts | Corrosion resistance |
| Lightweight structures | Weight-saving components | Strength-to-density ratio |
| Explosive cladding | Clad composite plates | Bonding + corrosion resistance |
| Product Form | DIN / EN Standard | Notes |
|---|---|---|
| Sheet, strip and plate | DIN 17860 · W.Nr. 3.7055 | Ti99.3 |
| Bar, rod and wire | DIN 17850 · W.Nr. 3.7055 | — |
| Seamless / welded tube | DIN 17869 · W.Nr. 3.7055 | — |
| Inspection documents | EN 10204 | — |
Commercially pure (unalloyed) titanium, medium-oxygen grade. W.Nr. 3.7055 (Ti99.3).
| W.Nr. | Ti % | O max % | Fe max % | Best Used For |
|---|---|---|---|---|
| 3.7055 | ≈99.3 | 0.30 | 0.25 | Higher-strength CP titanium; highest ASME design stress |
| 3.7025 | ≈99.6 | 0.15 | 0.15 | Softest CP titanium; max formability (Grade 1) |
| 3.7035 | ≈99.5 | 0.20 | 0.25 | Workhorse CP titanium; best overall balance (Grade 2) |
| 3.7065 | ≈99.2 | 0.40 | 0.50 | Strongest CP titanium (Grade 4) |
| 3.7235 | ≈99.5 | 0.20 | 0.25 | CP titanium + Pd; enhanced acid resistance (Grade 7) |
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