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
3.7225 is the German material number for a palladium-bearing commercially pure (unalloyed) titanium built on the soft, highly formable low-oxygen base, developed for enhanced corrosion resistance. This datasheet presents the material within the Werkstoff-Nummer (DIN / EN) designation system.
3.7225 has essentially the same composition and mechanical properties as the soft low-oxygen pure-titanium grade 3.7025, but with a deliberate addition of about 0.12–0.25% palladium that greatly enhances corrosion resistance. It is the formable counterpart of 3.7235: the palladium gives the same enhanced resistance to reducing acids and crevice corrosion in hot chloride-containing media, while the low-interstitial base provides excellent ductility, high impact toughness and the best formability of the palladium grades. It is chosen where both high corrosion resistance and extensive forming are required.
Typical applications include chemical-processing reactors and heat exchangers handling reducing acids, chlor-alkali and hydrometallurgical equipment, and marine and desalination components requiring the highest corrosion resistance.
| Property | Value | Unit |
|---|---|---|
| Density | 4.51 | g/cm³ |
| Melting point | 1660 | °C |
| Elastic modulus | 105 | GPa |
| Coefficient of thermal expansion (20–100 °C) | 8.6 | µm/m·°C |
| Thermal conductivity (20 °C) | 17 | 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 |
| Palladium | Pd | 0.12 | 0.25 | Enhances corrosion resistance |
| Iron | Fe | — | 0.20 | Residual; low (soft base) |
| Oxygen | O | — | 0.15 | Interstitial; low (soft base) |
| Carbon | C | — | 0.08 | 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. 3.7225.
| Condition | Property | Value |
|---|---|---|
| Annealed | Tensile strength (Rm) | 290–410 MPa |
| Annealed | 0.2% proof strength (Rp0.2) | ≥180 MPa |
| Annealed | Elongation (A5) | ≥30 % |
| Annealed | Hardness | ~120 HV |
| — | Elastic modulus | 105 GPa |
Values per DIN 17850 (mechanically equivalent to 3.7025); not hardenable by heat treatment. Confirm against the inspection certificate (EN 10204).
| Environment | Performance | Notes |
|---|---|---|
| Reducing acids (HCl, H₂SO₄) | Excellent | Palladium greatly improves resistance vs unalloyed Ti |
| Crevice corrosion (hot chlorides) | Excellent | Major advantage of the Pd addition |
| Seawater / marine | Excellent | Self-healing oxide film |
| Oxidizing acids (e.g. nitric) | Excellent | Stable passive film |
| Chloride stress-corrosion cracking | Excellent | Highly resistant |
The palladium addition gives the best corrosion resistance of the titanium grades — particularly in hot reducing acids and chloride-bearing media where it strongly resists crevice corrosion.
A palladium-bearing 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 palladium-bearing 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 | Good — bending, drawing |
| Hot forming | ~600–800 °C; protect from contamination; anneal afterward |
| Industry | Typical Components | Key Requirements |
|---|---|---|
| Chemical processing | Reactors, heat exchangers, columns | Reducing-acid / crevice resistance |
| Chlor-alkali | Cells and components in hot chlorides | Crevice corrosion resistance |
| Hydrometallurgy | Autoclaves, leaching equipment | Severe corrosive resistance |
| Marine / desalination | Harsh-environment parts | Corrosion resistance |
| Product Form | DIN / EN Standard | Notes |
|---|---|---|
| Sheet, strip and plate | DIN 17860 · W.Nr. 3.7225 | TiPd0.2 |
| Bar, rod and wire | DIN 17850 · W.Nr. 3.7225 | — |
| Seamless / welded tube | DIN 17869 · W.Nr. 3.7225 | — |
| Inspection documents | EN 10204 | — |
Palladium-bearing commercially pure titanium (Ti-0.15Pd) on soft base. W.Nr. 3.7225 (TiPd0.2).
| W.Nr. | Pd % | Fe max % | Type | Best Used For |
|---|---|---|---|---|
| 3.7225 | 0.12–0.25 | 0.20 | CP + Pd | Ti-0.15Pd on soft base; corrosion resistance + max formability |
| 3.7025 | — | 0.15 | CP (unalloyed) | Softest CP titanium (base grade) |
| 3.7235 | 0.12–0.25 | 0.25 | CP + Pd | Ti-0.15Pd on Grade 2 base (higher strength) |
| 3.7035 | — | 0.25 | CP (unalloyed) | Workhorse CP titanium |
| 3.7105 | — | 0.30 | CP-type alloy | Ti-0.3Mo-0.8Ni; enhanced corrosion (Grade 12) |
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