The GR7 GR9 Titanium Alloy Sheet
What is GR7 Titanium Alloy Sheet?
GR7 (Grade 7, UNS R52400) is essentially Grade 2 titanium with a small, controlled addition of palladium (0.12-0.25%). This precious metal addition dramatically enhances corrosion resistance in reducing acid environments where standard titanium grades may show limited performance, while maintaining the excellent fabricability of Grade 2.
Key Features of GR7 Titanium Sheet:
Superior Corrosion Resistance: Significantly better than standard CP grades in reducing acids (sulfuric, hydrochloric, phosphoric)
Excellent Resistance to Crevice Corrosion: Outperforms all other CP grades in tight crevice conditions
Identical Mechanical Properties to Grade 2: Palladium addition does not affect strength or formability
Excellent Formability: Same outstanding formability as Grade 2
Outstanding Weldability: Readily weldable using standard titanium welding techniques
Applications of GR7 Titanium Sheets
| Industry | Applications |
|---|---|
| Chemical Processing | Reactor vessels, heat exchangers, distillation columns, piping systems, tank linings |
| Chlor-Alkali Production | Cell components, brine heaters, chlorine handling equipment |
| Metal Refining | Pickling tanks, acid recovery systems, leaching vessels |
| Pharmaceutical | Reactor vessels, processing equipment, storage tanks |
| Pulp & Paper | Bleaching equipment, digesters, washer drums |
| Pollution Control | Scrubbers, ductwork, stack liners, FGD systems |
Chemical Composition (GR7)
| Element | Composition Requirement (%) | Typical Value (%) |
|---|---|---|
| Titanium (Ti) | Balance | Balance |
| Palladium (Pd) | 0.12 – 0.25 | 0.15 – 0.20 |
| Iron (Fe) | ≤ 0.30 | 0.12 – 0.20 |
| Oxygen (O) | ≤ 0.25 | 0.15 – 0.20 |
| Carbon (C) | ≤ 0.08 | 0.02 – 0.03 |
| Nitrogen (N) | ≤ 0.03 | 0.01 – 0.02 |
| Hydrogen (H) | ≤ 0.015 | 0.002 – 0.005 |
Mechanical Properties (GR7, Annealed)
| Property | ASTM B265 Requirement | Typical Value |
|---|---|---|
| Tensile Strength (Ultimate) | ≥ 345 MPa (≥ 50 ksi) | 400 – 550 MPa |
| Yield Strength (0.2% Offset) | ≥ 275 MPa (≥ 40 ksi) | 300 – 450 MPa |
| Elongation | ≥ 20% | 25 – 30% |
| Hardness (Rockwell B) | – | 75 – 85 HRB |
| Modulus of Elasticity | – | 103 – 107 GPa |
What is GR9 Titanium Alloy Sheet?
GR9 (Grade 9, UNS R56320) is a titanium alloy containing 3% aluminum and 2.5% vanadium (Ti-3Al-2.5V). It is often described as "half the strength of Ti-6Al-4V with twice the formability," making it the preferred choice for applications requiring moderate strength with exceptional forming characteristics.
Key Features of GR9 Titanium Sheet:
Excellent Formability: Can be cold formed, bent, and shaped more readily than higher-strength alloys
Good Strength: Approximately 60% higher strength than Grade 2
Superior Weldability: Readily weldable with properties approaching base metal
Good Corrosion Resistance: Equivalent to commercially pure titanium in most environments
Light Weight: Density 40% lower than steel
Fatigue Resistance: Good high-cycle fatigue properties
Applications of GR9 Titanium Sheets
| Industry | Applications |
|---|---|
| Aerospace | Hydraulic tubing systems, airframe components, ducting, brackets |
| Hydraulic Systems | High-pressure hydraulic components, fittings |
| Sports & Leisure | Bicycle frames, golf club shafts, tennis rackets, ski poles |
| Automotive | Heat shields, exhaust components, suspension parts |
| Marine | Offshore components, underwater housings |
Chemical Composition (GR9)
| Element | Composition Requirement (%) | Typical Value (%) |
|---|---|---|
| Titanium (Ti) | Balance | Balance |
| Aluminum (Al) | 2.5 – 3.5 | 3.0 |
| Vanadium (V) | 2.0 – 3.0 | 2.5 |
| Iron (Fe) | ≤ 0.25 | 0.12 – 0.18 |
| Oxygen (O) | ≤ 0.15 | 0.10 – 0.12 |
| Carbon (C) | ≤ 0.08 | 0.02 – 0.03 |
| Nitrogen (N) | ≤ 0.03 | 0.01 – 0.02 |
| Hydrogen (H) | ≤ 0.015 | 0.002 – 0.005 |
Mechanical Properties (GR9, Annealed)
| Property | ASTM B265 Requirement | Typical Value |
|---|---|---|
| Tensile Strength (Ultimate) | ≥ 620 MPa (≥ 90 ksi) | 650 – 750 MPa |
| Yield Strength (0.2% Offset) | ≥ 483 MPa (≥ 70 ksi) | 520 – 600 MPa |
| Elongation | ≥ 15% | 18 – 22% |
| Hardness (Rockwell C) | – | 24 – 28 HRC |
| Modulus of Elasticity | – | 100 – 110 GPa |
Comparison – GR7 vs GR9
| Parameter | GR7 | GR9 |
|---|---|---|
| Type | CP Titanium with Palladium | Alpha-Beta Alloy (Ti-3Al-2.5V) |
| Primary Advantage | Superior corrosion resistance | Excellent formability + good strength |
| Tensile Strength | ≥ 345 MPa | ≥ 620 MPa |
| Yield Strength | ≥ 275 MPa | ≥ 483 MPa |
| Elongation | ≥ 20% | ≥ 15% |
| Formability | Excellent | Very Good |
| Corrosion Resistance | Superior (reducing acids) | Good (CP-equivalent) |
| Weldability | Excellent | Excellent |
| Relative Cost | High | Medium |
| Key Applications | Aggressive chemical processing | Aerospace, sports, formed components |
Quality Management Systems
ISO 9001:2015 – Quality Management System
AS9100D – Aerospace Quality Management (for GR9)
PED 2014/68/EU – Pressure Equipment Directive (for GR7)
ISO 14001 – Environmental Management
ISO 45001 – Occupational Health and Safety
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