Gr1 Titanium Pipe Corrosion Resistance
May 15, 2026
Corrosion Resistance of GR1 Titanium Pipe
GR1 titanium tube offers excellent corrosion resistance in the following environments:
| Environment | Corrosion Resistance |
|---|---|
| Neutral and oxidizing media | Excellent |
| Dilute reducing acids | Good (including various acids from normal temperature to boiling point) |
| Nitric acid (various concentrations) | Good |
| Alkali solutions | Good for most (saturated solutions of barium hydroxide, calcium hydroxide, magnesium hydroxide at room temperature) |
| Seawater | No corrosion at all – completely resistant |
| Most organic acids | Resistant (except formic acid and oxalic acid) |
| Wet chlorine gas | Excellent |
| Chloride solutions (chlorite, hypochlorite) | Excellent |
| Sodium chloride solutions | Corrosion resistance increases with increasing solution pH |
Limitations of GR1 titanium pipe:
| Limitation | Description |
|---|---|
| Fluoride and hydrofluoric acid | Will fail quickly in environments containing fluoride and hydrofluoric acid |
| Boiling sodium hydroxide | Cannot be used for boiling sodium hydroxide solutions |
GR1 titanium for chemical processing is widely used due to its excellent corrosion resistance. GR1 titanium heat exchanger tubes and GR1 titanium reactor components benefit from this property.
Processing Performance of GR1 Titanium Tube
GR1 titanium pipe has specific processing characteristics:
| Property | Characteristic | Implication for GR1 titanium tube |
|---|---|---|
| Thermal expansion coefficient | Small | Less thermal stress generated under high-temperature working conditions or during thermal processing |
| Thermal conductivity | Poor – only 1/5 of iron | Requires careful heat management during welding and forming |
| Friction coefficient | Large (μ=0.2) | Makes cutting and grinding difficult – affects GR1 titanium machinability |
| Elastic modulus | Low | Contributes to large rebound during cold deformation |
| Yield-to-strength ratio | High | Makes GR1 titanium forming/bending difficult – hard to form and straighten |
Key considerations for GR1 titanium tube processing:
GR1 titanium machinability is challenging due to large friction coefficient
GR1 titanium forming/bending has large rebound due to low elastic modulus and high yield-to-strength ratio
How to weld GR1 titanium requires attention to poor thermal conductivity
Physical Properties of Titanium Grade 1
| Property | Value |
|---|---|
| Titanium grade 1 density | 4.51 g/cm³ |
| Thermal conductivity | 1/5 of iron (approximately 15-17 W/m·K) |
| Thermal expansion coefficient | Small |
| Elastic modulus | Low (~106 GPa) |
| Friction coefficient | μ=0.2 |
High Temperature Behavior
| Condition | Behavior |
|---|---|
| Room temperature to 600°C | Dense oxide film forms on surface – maintains metallic luster |
| Above 600°C | Oxide film loses its protective effect |
GR1 titanium pipe is very stable in the atmosphere. A dense oxide film is formed on the surface, which can maintain the metallic luster. However, when heated to above 600°C, the oxide film loses its protective effect.
Applications of GR1 Titanium Tube
GR1 titanium tube is used in the following industries:
| Industry | Application |
|---|---|
| Aerospace | Structural components, fluid handling systems |
| Plate heat exchangers | GR1 titanium heat exchanger tubes |
| Bellows compensation expansion joints | Flexible piping connections |
| Seawater desalination | Corrosion-resistant piping |
| Desulfurization and denitrification | Flue gas treatment equipment |
| Chemical equipment | GR1 titanium for chemical processing – reactors, piping, vessels |
| Civil tableware | Non-toxic, corrosion-resistant products |
Available Supply Forms
| Form | Availability |
|---|---|
| GR1 titanium pipe | Yes |
| GR1 titanium tube | Seamless (ASTM B861) and welded (ASTM B862) |
| Plates | Reference only |
| Bars | Reference only |
| Pipe fittings | Elbows, tees, reducers, caps |
| Fasteners | Bolts, nuts, washers |
| Flanges | For piping connections |
GR1 vs GR2 Comparison
| Property | GR1 Titanium Pipe | GR2 |
|---|---|---|
| Purity | ≥99.5% | ≥99.2% |
| Oxygen max | 0.18% | 0.25% |
| GR1 titanium yield strength | ~170 MPa | ~275 MPa |
| Tensile strength | 240 MPa | 345 MPa |
| Elongation | 24% | 20% |
| Corrosion resistance | Excellent | Excellent |
| Formability | Better (but large rebound) | Moderate |
FAQ
Q1: What is GR1 titanium pipe?
A: GR1 titanium pipe (also called pure titanium GR1, TR270C) has strong corrosion resistance in many media, especially in neutral and oxidizing media. GR1 titanium tube conforms to ASTM B338 (pipe) and ASTM B861 (seamless tube) standards with UNS R50250 designation.
Q2: What is the UNS number for ASTM B861 grade 1 titanium tube?
A: The UNS number for ASTM B861 grade 1 titanium tube is R50250. ASTM B338 grade 1 titanium pipe also uses UNS R50250. The equivalent designation TR270C is also used in some standards.
Q3: Is GR1 titanium pipe corrosion resistant to seawater?
A: Yes, GR1 titanium pipe is completely resistant to seawater – no corrosion at all. GR1 titanium tube is also resistant to most organic acids (except formic acid and oxalic acid) and has excellent corrosion resistance in wet chlorine gas and chloride solutions.
Q4: What are the limitations of GR1 titanium pipe?
A: GR1 titanium pipe will fail quickly in environments containing fluoride and hydrofluoric acid. It cannot be used for boiling sodium hydroxide solutions. GR1 titanium tube should not be exposed to these environments.
Q5: Why is GR1 titanium pipe difficult to form and machine?
A: GR1 titanium machinability is challenging due to large friction coefficient (μ=0.2). GR1 titanium forming/bending has large rebound due to low elastic modulus and high yield-to-strength ratio. The thermal conductivity of GR1 titanium is poor (only 1/5 of iron), affecting heat management during processing.
Q6: What happens to GR1 titanium pipe at high temperatures?
A: GR1 titanium pipe forms a dense oxide film on the surface at room temperature up to 600°C, maintaining metallic luster. When heated to above 600°C, the oxide film loses its protective effect. GR1 titanium tube should not be used above 600°C for extended periods.
Q7: Is GR1 titanium pipe suitable for heat exchangers?
A: Yes, GR1 titanium heat exchanger tubes are widely used in plate heat exchangers and other applications. Despite poor thermal conductivity (1/5 of iron), the thin wall thickness of GR1 titanium tube provides effective heat transfer combined with excellent corrosion resistance.
Q8: What are the applications of GR1 titanium tube?
A: GR1 titanium tube is used in aerospace, plate heat exchangers, bellows compensation expansion joints, seawater desalination, desulfurization and denitrification, chemical equipment, and civil tableware industries. GR1 titanium for chemical processing and GR1 titanium heat exchanger applications are most common.
