GR1 vs GR2 Titanium Sheet – Ultimate Industrial Guide
Overview
GR1 and GR2 Titanium Sheets arethe most widely used pure titanium grades for industrial applications, including chemical processing, desalination, marine engineering, and heat exchangers. Choosing the correct grade impacts durability, corrosion resistance, fabrication ease, and structural integrity.
- GR1:Highly ductile, lower strength, ideal for thin-sheet applications and highly corrosive environments.
- GR2:Stronger and more versatile for medium- to thick-sheet applications with mechanical load requirements.
Pro Tip: For sheets >1500mm wide or >20mm thick, always ensure pre-leveling and precise cut-to-length processing. Learn more in our Cut-to-Length Titanium Coil Guide.
Chemical Composition Comparison
| Element | GR1 | GR2 | Notes |
| Titanium (Ti) | ≥99.2% | ≥99.2% | Ensures corrosion resistance |
| Oxygen (O) | ≤0.18% | ≤0.25% | GR1 is more ductile |
| Nitrogen (N) | ≤0.03% | ≤0.05% | Slightly increases strength in GR2 |
| Carbon (C) | ≤0.08% | ≤0.10% | GR2 slightly harder |
| Iron (Fe) | ≤0.20% | ≤0.30% | GR2 provides additional tensile strength |
Insight: GR1 is optimized for extreme corrosion resistance, whereas GR2 provides higher mechanical strength.
For detailed processing notes, see Titanium Sheet Leveling Process Explained.
Mechanical Properties & Thickness Guidance
| Property | GR1 | GR2 | Unit | Notes / Applications |
| Tensile Strength | 240–370 | 345–450 | MPa | GR2 suitable for structural components |
| Yield Strength | ≥170 | ≥275 | MPa | GR1 easier to bend without cracking |
| Elongation | ≥24 | ≥20 | % | GR1 preferred for forming complex shapes |
| Hardness | 120 | 150 | HB | GR2 better for wear-resistance |
| Recommended Thickness | 0.5–6mm | 2–50mm | mm | GR1 thin sheets, GR2 medium/thick sheets |
Highlight: GR1 is more formable, GR2 is load-bearing capable. For optimal thickness selection, refer to our Titanium Sheet Thickness Guide.
Corrosion Resistance
| Environment | GR1 | GR2 | Notes |
| Strong acids (HNO₃, HCl) | Excellent | Moderate | GR1 ideal for chemical tanks |
| Seawater / Marine | Good | Excellent | GR2 preferred for marine components |
| Neutral chemical solutions | Excellent | Excellent | Both grades applicable |
| Industrial wastewater | Excellent | Excellent | GR1 better for thin liners |
Recommendation: Use GR1 for extreme acid exposure, GR2 for high-load, moderate-corrosion environments. See more in Titanium Sheet Applications in Chemical Industry and Titanium Sheet Applications in Desalination Plants.
Industrial Applications & Case Studies
- Chemical Reactor Linings
- Material: GR1, 4mm thick
- Challenge: Highly acidic process environment
- Solution: GR1 sheet with Pickled/Passivated finish
- Outcome: No leakage, minimal maintenance over 5 years
- Reference:Titanium Sheet Applications in Chemical Industry
- Heat Exchanger Plates (Seawater Desalination)
- Material: GR2, 3–12mm thick
- Challenge:Large plates with potential coil set
- Solution: Roller leveling + CTL cutting
- Outcome: Flatness deviation <0.5mm, improved welding, 15% faster assembly
- Reference:Cut-to-Length Titanium Coil Guide, Titanium Sheet for Heat Exchangers
- Marine Deck Panels
- Material: GR2, 8–20mm thick
- Challenge: Corrosion + mechanical stress from loads
- Solution:Pre-leveling, BA finish for smooth surface
- Outcome:Long-lasting, minimal corrosion, easy installation
- Reference:Titanium Sheet Applications in Marine Engineering
- Precision Piping & Thin Sheet Applications
- Material:GR1, 0.5–3mm
- Outcome: High flexibility, easy bending/welding, excellent corrosion resistance
Selection Guidelines
Environment:
- Acidic → GR1
- Seawater / neutral → GR2
Mechanical Load:
- High load → GR2
- Low load / thin sheets → GR1
Fabrication:
- Complex bends → GR1
- Heavy welding / structural → GR2
Thickness Consideration:
- <2mm → GR1
- 2–20mm → GR2 standard
- 20mm → GR2 heavy-duty
For processing and fabrication guidance, see Titanium Welding & Fabrication Tips.
Expanded FAQ
Q1: Can GR1 and GR2 be used interchangeably?
A1: No. Each grade has specific mechanical and corrosion properties. Misuse may lead to premature failure.
Q2: Which grade is better for seawater exposure?
A2: GR2 is preferred for long-term seawater applications.
Q3: Are there different surface finishes for GR1/GR2 sheets?
A3: Yes. Bright Annealed (BA) for aesthetics, Pickled/Passivated for enhanced corrosion resistance.
Q4: What is the recommended welding method?
A4: TIG or MIG with inert gas protection; GR1 easier to weld due to higher ductility.
Q5: Can thin GR1 sheets be used in heat exchangers?
A5: Yes, but ensure proper leveling and CTL cutting to maintain flatness.
Q6: How does sheet width affect selection?
A6: Wide plates (>1500mm) may require special leveling equipment; GR2 preferred for wide, thick plates.
Q7: How long is the service life?
A7: Depends on environment, thickness, and fabrication quality; typically >10 years for properly installed GR2 in seawater, >5 years for GR1 in acidic chemicals.
Get Expert Support for Your Titanium Sheet Project
- Request a quote with your required thickness, size, and specifications
- Get engineering advice on GR1 vs GR2 selection, leveling, and fabrication
With 20+ years of experience in titanium sheet manufacturing, ProX Metal supports projects across chemical processing, desalination, and marine industries.