Is Gr1 Titanium Foil Suitable for Chemical Equipment?
- Gr1 Titanium Foil
Material selection directly decides the service life and operational safety of chemical equipment. Gr1 titanium foil (commercial pure titanium TA1, complying with ASTM B265) has strict control on interstitial elements: oxygen ≤ 0.16%, iron ≤ 0.20% and carbon ≤ 0.08%. It features strong corrosion resistance, good workability and biosafety. It has become a preferred material for key parts of chemical equipment.
Compared with traditional stainless steel and nickel-based alloys, Gr1 titanium foil is lighter. Its density is about 57% of ordinary carbon steel. It maintains high strength, and also has excellent ductility and weldability. Its common thickness ranges from 0.1 mm to 1.0 mm. Ultra-thin types down to 0.02 mm serve precision parts, which are rarely used in chemical equipment and mainly for electronics and medical devices. Its width covers 350 mm to 670 mm. Such ultra-thin and wide sizes support integrated design for chemical equipment. They cut weld joints, lower leakage risks and reduce maintenance costs. This material balances performance and economy for the chemical industry.
1. How Gr1 Titanium Foil Meets Requirements of Chemical Working Conditions
1.1 Strong corrosion resistance against various media
Chemical equipment runs in acidic, alkaline and salty corrosive media for a long time. A dense oxide film quickly forms on the surface of Gr1 titanium foil, and this passive film can repair itself. In normal temperature, low and medium concentration nitric acid, sulfuric acid and other oxidizing or moderately reducing acid solutions, its corrosion rate is far lower than stainless steel. For example, in 20% sulfuric acid at 30 ℃, its annual corrosion rate is no more than 0.1 mm, while 316L stainless steel exceeds 1 mm.
Note that pure titanium cannot resist high-concentration and high-temperature hydrochloric acid. Its corrosion rate rises sharply when hydrochloric acid concentration is over 10% or temperature exceeds 60 ℃. In seawater or chlorine-containing chemical processes with high chloride ion content, Gr1 titanium foil resists pitting and crevice corrosion under normal working conditions. But local corrosion may occur under combined conditions of temperature above 80 ℃, high chloride ions, low pH value and high stress. Engineers shall avoid such conditions in design.
1.2 Stable performance in a wide temperature range
The melting point of Gr1 titanium foil is around 1668 ℃. It keeps stable mechanical properties and chemical inertness within the common working temperature range of chemical equipment from -50 ℃ to 300 ℃. In annealed state, its tensile strength is no less than 240 MPa, yield strength no less than 170 MPa and elongation no less than 24%. It withstands pressure fluctuation and thermal expansion and contraction during equipment operation. Its thermal conductivity is about 21.9 W/(m·K) at 20 ℃ room temperature. The moderate thermal conductivity suits the design of heat exchangers.
1.3 Non-magnetic property and biocompatibility expand application scope
Gr1 titanium foil is non-magnetic. It works well for precision chemical instruments and electronic testing devices, and causes no interference to magnetic field sensitive detectors. In pharmaceutical and food additive production and other chemical fields related to human safety, Gr1 titanium foil meets requirements of FDA and ISO 10993 for food contact and medical use. It releases no harmful ions into media, and guarantees product purity and safety.
Table 1 Performance Comparison between Gr1 Titanium Foil and Common Chemical Materials (Annealed state, room temperature, typical values)
| Performance Index | Gr1 Titanium Foil (ASTM B265) | 316L Stainless Steel (ASTM A240, Annealed) | Nickel-based Alloy (Hastelloy C-276, Solution Treated) |
|---|---|---|---|
| Density (g/cm³) | 4.51 | 7.98 | 8.89 |
| Tensile Strength (MPa) | ≥240 | ≥485 | ≥690 |
| Chloride Corrosion Resistance¹ | Excellent (No pitting in 3.5% NaCl solution at room temperature) | Fair (Prone to pitting in 3.5% NaCl solution at room temperature) | Good (Resist pitting in 3.5% NaCl solution at room temperature) |
| Formability² | Excellent | Good | Poor |
Notes:
¹ Chloride corrosion resistance results come from static immersion or electrochemical tests in 3.5% NaCl solution at room temperature, in accordance with ASTM G48 or G61. Actual corrosion resistance changes with temperature, concentration, pH value and flow velocity. This table only shows general comparison.
² Formability evaluates the difficulty of cold bending, deep drawing and winding. Gr1 titanium foil has high elongation above 24% for excellent formability. 316L stainless steel has an elongation of about 40%, yet its high strength leads to good formability. Nickel-based alloys have high strength and rapid work hardening, so their formability is poor.
All listed mechanical properties are minimum typical values for annealed materials. Actual values vary with heat treatment and processing status.
2. How Ultra-thin and Wide Sizes Reshape Chemical Equipment Design
2.1 Integrated structure reduces leakage risks
Traditional chemical equipment liners use multiple spliced plates. Every weld becomes a potential source of corrosion and leakage. The wide Gr1 titanium foil with width from 350 mm to 670 mm and thickness from 0.1 mm to 1.0 mm can form full linings for certain reaction kettles and storage tanks. It cuts circumferential welds by over 50% compared with multi-piece splicing structures. The equipment gains better sealing performance and corrosion resistance. Note that wide full liners have limits on equipment diameter and forming curvature, so they do not fit all containers.
2.2 Lightweight design cuts equipment weight
For atmospheric and low-pressure chemical towers and heat exchangers, replacing stainless steel with titanium foil reduces equipment weight by about 40% under the same strength requirements. A 0.5 mm thick titanium foil has equivalent strength to 1.2 mm thick stainless steel, calculated per pressure vessel strength formulas. Lightweight structures lower infrastructure investment, transportation and installation costs, and relieve structural stress.
2.3 High precision processing fits complex working conditions
Chemical-grade Gr1 titanium foil above 0.1 mm has a thickness tolerance of ±0.01 mm to ±0.02 mm under precision rolling, complying with ASTM B265. Its surface roughness Ra is no more than 0.4 μm tested per GB/T 1031, which meets the requirements of most chemical units. It is supplied in coil form for continuous production and automatic processing. It adapts to stamping, bending, laser welding and other forming processes.
3. Typical Application Scenarios of Gr1 Titanium Foil in Chemical Equipment
3.1 Lining systems for reaction kettles and storage tanks
Gr1 titanium foil serves as liners for storage and reaction equipment that holds dilute normal-temperature hydrochloric acid, dilute sulfuric acid, lye and other highly corrosive chemicals. It separates corrosive media from carbon steel substrates. Titanium foil with thickness between 0.3 mm and 0.8 mm usually adopts adhesive bonding or loose lining structures, excluding explosive cladding. Explosive cladding applies to titanium plates thicker than 1.5 mm. Workers conduct degreasing and pickling activation for surface treatment to ensure reliable bonding and welding quality.
3.2 Heat transfer components for heat exchangers and condensers
Plate heat exchangers and spiral plate heat exchangers use 0.4 mm to 0.6 mm thick Gr1 titanium foil as heat transfer plates. The material resists corrosion and needs little maintenance, especially for media containing chloride and sulfur. In seawater cooling systems, the service life of titanium foil heat exchangers is over 10 times that of carbon steel, under normal temperature and flow velocity no more than 3 m/s.
3.3 Diaphragm supports and electrode substrates for electrolytic cells
Gr1 titanium foil works as diaphragm supports or electrode substrates in chlor-alkali production and non-ferrous metal electrolysis. Note that DSA anodes normally use titanium plates or meshes. Ultra-thin titanium foil of 0.05 mm to 0.1 mm has insufficient rigidity and is not suitable here. Its resistivity ranges from 48 μΩ·cm to 55 μΩ·cm, better than stainless steel. Coated titanium foil can be made into electrodes to improve current efficiency.
Table 2 Recommended Specifications of Gr1 Titanium Foil for Chemical Equipment (Atmospheric / Low Pressure, Normal Temperature to 100 ℃)
| Equipment Parts | Recommended Thickness (mm) | Recommended Width (mm) | Working Conditions (Pressure / Temperature) | Key Performance Requirements |
|---|---|---|---|---|
| Reaction Kettle Liner | 0.5 ~ 0.8 | 500 ~ 670 | Medium and low pressure (≤2.5 MPa), Normal temperature ~ 150 ℃ | Formability, Weldability |
| Heat Exchanger Plate | 0.4 ~ 0.6 | 350 ~ 550 | Medium and low pressure (≤1.6 MPa), Normal temperature ~ 200 ℃ | Thermal conductivity, Pressure resistance |
| Electrolytic Cell Diaphragm | 0.05 ~ 0.1 | 400 ~ 600 | Atmospheric pressure, 40 ~ 80 ℃ (Electrolyte) | Electrical conductivity, Flatness |
| Pipeline Lining | 0.2 ~ 0.5 | 350 ~ 500 | Medium and low pressure (≤1.0 MPa), Normal temperature ~ 150 ℃ | Flexibility, Wear resistance |
| Filter Support | 0.1 ~ 0.3 | 350 ~ 670 | Atmospheric pressure, Normal temperature ~ 100 ℃ | Rigidity, Flatness, Corrosion resistance |
4. Production Processes for Stable Quality of Chemical-grade Titanium Foil
4.1 Precision rolling ensures accurate thickness
The production line uses 750 mm twenty-high precision rolling mills. Multiple cold rolling passes thin the material gradually. The single pass reduction rate is controlled below 20% to avoid edge cracking of thin foil. The automatic gauge control system monitors rolling force and thickness deviation in real time. The thickness tolerance of chemical-grade foil follows ASTM B265, with typical tolerance of ±0.01 mm to ±0.02 mm.
4.2 Cleaning and annealing improve surface quality
Ultrasonic cleaning and alkaline solution treatment remove rolling oil and surface impurities. The continuous argon shield annealing furnace runs at 580 ℃ to 680 ℃, the recrystallization temperature range of pure titanium. The temperature fluctuation is controlled within ±5 ℃. The process eliminates work hardening and restores elongation to above 24%. The cold deformation rate of raw materials is usually over 60%.
4.3 Full-range quality inspection guarantees batch consistency
Laser thickness gauges and surface defect inspection systems run throughout production. Every titanium foil coil undergoes tensile test, hardness test, metallographic analysis and chemical composition test. We provide material certificates complying with ASTM B265 and ASME Boiler Code for pressure vessels. The product traceability system keeps stable quality across all batches.
Table 2 Key Quality Control Indicators for General Chemical-grade Gr1 Titanium Foil
| Control Item | Standard Requirement | Typical Control Value |
|---|---|---|
| Thickness Tolerance | ASTM B265 (±0.01 ~ 0.03 mm for 0.1 ~ 1.0 mm foil) | ±0.015 mm |
| Surface Roughness Ra | ≤0.8 μm (General grade) | ≤0.4 μm (Optional precision grade) |
| Annealing Temperature Deviation | ±10 ℃ | ±5 ℃ |
| Elongation (Annealed) | ≥24% | ≥25% |
| Chemical Composition | Comply with ASTM B265 Gr1 | O ≤ 0.16%, Fe ≤ 0.20% |
5. Economic Benefits of Gr1 Titanium Foil for Chemical Enterprises
5.1 Longer service life cuts replacement frequency
Under normal working conditions with normal temperature and dilute acid media, titanium foil lined equipment works for 15 to 20 years. Ordinary carbon steel equipment needs major maintenance every 3 to 5 years. Titanium foil has an initial investment 1.5 to 2 times higher than stainless steel of the same size. However, it reduces the total life cycle cost by over 30%.
5.2 Fewer maintenance stops raise production efficiency
The high corrosion resistance of Gr1 titanium foil greatly lowers unplanned shutdowns. Equipment failure rate drops by around 70% compared with traditional materials under similar conditions. Annual maintenance times decrease from 4 to 1, which improves production capacity utilization.
5.3 Optimized process parameters improve product quality
The chemical inertness of titanium foil prevents metal ion contamination. For fine chemical and pharmaceutical intermediate production, product yield rises by 2 to 5 percentage points. Titanium foil heat exchangers support higher process temperatures and expand the applicable process range.
Conclusion
Gr1 titanium foil shows prominent advantages in chemical equipment applications. It also has limitations. It has relatively high cost. It cannot work in high-concentration and high-temperature hydrochloric acid or sulfuric acid. Foil thinner than 0.1 mm is not suitable for high-pressure and heavy-load equipment. Users shall select materials according to media, temperature, pressure and structural requirements. Gr1 titanium foil is an ideal choice for environments with dilute acid, chloride ions, normal temperature and long service life requirements.
Frequently Asked Questions
Q1: What is the service life of Gr1 titanium foil in chlorine-containing chemical environments?
Under normal temperature, atmospheric pressure, chloride ion concentration below 10000 ppm, no gap and no stress concentration, its uniform corrosion rate is less than 0.01 mm per year. The theoretical service life exceeds 20 years. Users shall conduct regular inspection and avoid corrosion retention areas in design to prevent pitting and crevice corrosion in actual use.
Q2: How to achieve reliable connection between titanium foil and carbon steel substrate?
Explosive cladding or vacuum diffusion welding forms metallurgical bonding for titanium layers thicker than 1.5 mm. Bond strength is tested per ASTM E8 for tensile property and ASTM B898 for shear property. Adhesive bonding is the common method for thin titanium foil. Its lap shear strength reaches no less than 15 MPa per ASTM D1002. This method applies to working temperature below 120 ℃. Users shall check chemical erosion of adhesives by media. Direct welding between titanium and carbon steel produces brittle intermetallic compounds, so this method is not recommended.
Q3: How to select proper titanium foil thickness for specific working conditions?
For atmospheric or low pressure below 1 MPa and normal temperature dilute acid media, choose 0.5 mm to 1.0 mm thick foil for reaction kettle liners and 0.4 mm to 0.6 mm thick foil for heat exchanger plates. Liner thickness shall be no less than 1.5 mm or titanium clad plate shall be adopted for medium and high pressure vessels with pressure from 1 MPa to 4 MPa. You may provide detailed working parameters for professional selection and calculation support.
Looking for Reliable Gr1 Titanium Foil Suppliers?
Baoji Titanium Valley Titanium Nickel Zirconium Material Processing Co., Ltd. is a professional titanium foil manufacturer. We own advanced production lines with an annual output of 3000 tons. We supply high-precision titanium foil in sizes from 0.02 mm to 1.0 mm in thickness and 15 mm to 680 mm in width, along with customized processing services. Contact us for technical support and quotation: sales@titaniumvalleys.com
Note: All data in this article are typical test values under standard working conditions. Actual performance varies with specific processes, media and operating conditions. Please conduct special verification before key applications.
References
- Zhang Xiaoming, Zhao Yongqing, Bai Baoliang. Application of Titanium and Titanium Alloys in Chemical Industry[J]. Rare Metal Materials and Engineering, 2004, 33(3): 225-228.
- Compilation Group of Chemical Equipment Material Selection Manual. Chemical Equipment Material Selection Manual[M]. Beijing: Chemical Industry Press, 2016.
- Wang Qingjuan, Liu Linfeng. Research on Rolling Process and Properties of Ultra-thin Titanium Foil[J]. Titanium Industry Progress, 2019, 36(4): 20-25.
- ASTM B265-20 Standard Specification for Titanium and Titanium Alloy Strip, Sheet, and Plate.
- GB/T 3622-2012 Titanium and Titanium Alloy Strip and Foil.