GR1 Titanium Pipe vs GR2 Titanium Tube
May 15, 2026
GR1 vs GR2 Titanium Pipe
| Grade | Key Characteristic | Best For |
|---|---|---|
| GR1 titanium pipe | Higher ductility, stronger corrosion resistance | Applications requiring high toughness and strong corrosion resistance |
| GR2 titanium pipe | Higher strength | Areas requiring slightly higher strength |
GR1 titanium tube is mainly used for applications requiring high toughness and strong corrosion resistance. GR2 titanium tube has higher strength and is suitable for use in areas requiring slightly higher strength.
Chemical Composition Comparison
GR1 titanium chemical composition vs GR2:
| Element | GR1 Titanium | GR2 Titanium |
|---|---|---|
| Titanium (Ti) | ≥ 99.5% | ≥ 99.2% |
| Oxygen (O) | ≤ 0.18% | ≤ 0.25% |
| Nitrogen (N) | ≤ 0.03% | ≤ 0.03% |
| Hydrogen (H) | ≤ 0.015% | ≤ 0.015% |
| Carbon (C) | ≤ 0.08% | ≤ 0.08% |
| Iron (Fe) | ≤ 0.20% | ≤ 0.30% |
Mechanical Properties Comparison
| Property | GR1 Titanium Pipe | GR2 Titanium Pipe |
|---|---|---|
| Titanium grade 1 density | 4.51 g/cm³ | 4.51 g/cm³ |
| Melting point | 1668°C | 1668°C |
| Tensile strength | 240 MPa | 345 MPa |
| GR1 titanium yield strength | ~170 MPa | ~275 MPa |
| Ductility | Higher | Moderate |
| Corrosion resistance | Excellent | Excellent |
Difference between pure titanium GR1 and GR2: GR1 titanium pipe has higher ductility, suitable for applications requiring high ductility. GR2 titanium pipe has moderate ductility, suitable for applications carrying slightly higher loads.
Applications of GR1 Titanium Tube
Both GR1 and GR2 titanium tube have excellent biocompatibility and are widely used in medical, chemical, and aerospace industries.
| Industry | Application | Recommended Grade |
|---|---|---|
| Medical devices | Artificial joints, dental implants, biomedical devices – good biocompatibility | GR1 (higher ductility) |
| Chemical equipment | Equipment lining and piping – strong corrosion resistance | GR1 |
| Aerospace | Lightweight structural components, liners, protective screens | Both |
| Electronic components | High-precision components – suitable for high temperature and corrosive environments | Both |
Medical grade 1 titanium (ASTM F67 grade 1) is used for surgical implants. GR1 titanium for chemical processing is widely used for corrosion-resistant piping systems. GR1 titanium heat exchanger tubes benefit from the material's excellent corrosion resistance.
Available Specifications for GR1 Titanium Tube
| Parameter | Range |
|---|---|
| Wall thickness | 0.3mm – 5.0mm (based on material capabilities) |
| Diameter (OD) | Custom per customer requirement |
| Length | Cut according to customer requirements |
| Delivery status | Seamless (ASTM B861) or welded (ASTM B862), annealed condition |
Physical Properties
| Property | GR1 Titanium Pipe | GR2 Titanium Pipe |
|---|---|---|
| Density | 4.51 g/cm³ | 4.51 g/cm³ |
| Melting point | 1668°C | 1668°C |
| Corrosion resistance | Excellent | Excellent |
| Strength-to-weight ratio | Good | Better |
| Formability | Best (GR1 titanium for deep drawing) | Good |
| Weldability | Excellent | Excellent |
How to Weld GR1 Titanium Pipe
| Parameter | Recommendation |
|---|---|
| How to weld GR1 titanium | GTAW (TIG) with ERTi-1 filler metal |
| How to weld GR2 titanium | GTAW (TIG) with ERTi-2 filler metal |
| Argon shielding | Required on both sides for both grades |
| Preheat | Not required |
| Post-weld heat treatment | Not required for most applications |
Grade Comparison Table
| Property | GR1 | GR2 | GR5 |
|---|---|---|---|
| Purity | ≥99.5% | ≥99.2% | Alloy |
| Oxygen max | 0.18% | 0.25% | 0.20% |
| Tensile strength | 240 MPa | 345 MPa | 896 MPa |
| GR1 titanium yield strength | ~170 MPa | ~275 MPa | 827 MPa |
| Elongation | 24% min | 20% min | 10% min |
| Ductility | Highest | Moderate | Low |
| Corrosion resistance | Excellent | Excellent | Good |
| Formability | Best | Good | Poor |
FAQ
Q1: What is the difference between GR1 and GR2 titanium pipe?
A: The difference between pure titanium GR1 and GR2 is primarily oxygen content and purity. GR1 titanium pipe has 0.18% oxygen max and ≥99.5% purity, while GR2 has 0.25% oxygen max and ≥99.2% purity. GR1 titanium tube offers higher ductility and stronger corrosion resistance. GR2 offers higher strength. Titanium grade 1 vs grade 2 selection depends on application requirements.
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 B861 grade 2 titanium tube uses UNS R50400. ASTM B338 grade 1 titanium pipe also uses UNS R50250.
Q3: What is the density of titanium grade 1 pipe?
A: Titanium grade 1 density is 4.51 g/cm³. GR1 titanium pipe and GR2 have the same density. Melting point is 1668°C for both grades.
Q4: What is the tensile strength of GR1 titanium pipe vs GR2?
A: GR1 titanium pipe has tensile strength of 240 MPa. GR2 titanium pipe has tensile strength of 345 MPa (43% higher). GR1 titanium yield strength is approximately 170 MPa, while GR2 yield strength is approximately 275 MPa.
Q5: Which grade has higher ductility, GR1 or GR2?
A: GR1 titanium tube has higher ductility than GR2. GR1 titanium for deep drawing is preferred because of its higher ductility and lower strength. GR2 has moderate ductility, suitable for applications carrying slightly higher loads.
Q6: Is GR1 titanium pipe suitable for medical applications?
A: Yes, medical grade 1 titanium conforming to ASTM F67 grade 1 is used for artificial joints, dental implants, and other biomedical devices. Both GR1 and GR2 have excellent biocompatibility and are widely used in medical applications.
Q7: Is GR1 titanium pipe suitable for chemical equipment?
A: Yes, GR1 titanium for chemical processing is widely used in chemical equipment lining and piping due to its strong corrosion resistance. GR1 titanium heat exchanger tubes and GR1 titanium reactor components are common in the chemical industry.
Q8: Is GR1 titanium pipe suitable for aerospace applications?
A: Yes, GR1 titanium pipe is used to make lightweight structural components, such as liners and protective screens in aircraft. The good strength-to-weight ratio and corrosion resistance of GR1 titanium make it suitable for aerospace applications.
Q9: What is the purity difference between GR1 and GR2 titanium tube?
A: GR1 titanium tube has ≥99.5% titanium purity. GR2 has ≥99.2% titanium purity. The higher purity of GR1 titanium gives it better corrosion resistance and higher ductility.
