Titanium Grade 2 Tube Sheet
Roughly half the density of stainless steel, with corrosion resistance in seawater and chlorine environments that rivals or beats duplex and super duplex — the specification of choice when weight matters as much as corrosion resistance.
Chemical Composition
| Element | Max % |
|---|---|
| Titanium (Ti) | Balance |
| Oxygen (O) | 0.25 |
| Iron (Fe) | 0.30 |
| Carbon (C) | 0.08 |
| Nitrogen (N) | 0.03 |
| Hydrogen (H) | 0.015 |
Mechanical Properties
| Property | Typical Value |
|---|---|
| Tensile Strength | 345 MPa min |
| Yield Strength (0.2% offset) | 275 MPa min |
| Elongation | 20% min |
| Density | 4.51 g/cm³ |
Equivalent Grades
| Standard | Designation |
|---|---|
| ASTM / UNS | R50400 |
| EN / DIN | 3.7035 |
| JIS | Class 2 |
Weight Advantage, by the Numbers
A titanium tube sheet at the same dimensions as a stainless equivalent weighs roughly 44% less — a meaningful factor for offshore platforms and marine applications where topside weight has a real cost. Try the Weight Calculator with your own dimensions.
Available Product Forms
Titanium Grade 2 is most commonly ordered as Floating Tube Sheets for seawater condenser service, where its weight advantage and corrosion resistance both matter.
Applications
Seawater cooling and condensers, chlorine and chlorinated brine service, desalination, and offshore platforms where weight reduction has direct structural or cost benefit. See Marine & Shipbuilding and Desalination Plants.
Advantages & Limitations
Advantages
- Roughly 44% lighter than stainless or duplex at equal dimensions
- Excellent seawater and chlorine resistance
- Immune to chloride stress-corrosion cracking
Limitations
- Lower practical temperature ceiling (~315°C) than duplex
- Requires strict heat control during machining and welding
- Not suitable for hydrofluoric acid or strongly reducing acids
FAQ
Per kilogram, titanium typically costs more than duplex, but because a titanium tube sheet is roughly 44% lighter for the same dimensions, the total material cost gap is often smaller than the per-kilogram number suggests — particularly relevant when freight and installation weight also factor into total cost.
Titanium welding requires an inert gas shield (typically argon) covering both the weld pool and the surrounding heated metal to prevent oxygen and nitrogen contamination, which embrittles the joint. This is a qualified, specialized procedure, not a drop-in substitute for stainless welding practice.
Grade 2 (commercially pure) offers excellent corrosion resistance and adequate strength for most tube sheet applications at a lower cost than Grade 5, which is an alloyed, higher-strength grade more common in aerospace and structural applications where the extra strength is actually needed.