Heat-resistant titanium plates: A performance comparison of TI-13V-11CR-3AL and GR2 in high-temperature environments.
In high-temperature chlorine gas reactors in chlor-alkali plants, traditional 316L stainless steel pipes corrode and perforate in less than six months due to chloride ions, leading to production shutdowns for maintenance. However, replacing them with linings made of GR2 pure titanium plates enabled continuous operation for three years with no significant corrosion. This is not laboratory data, but real-world information from a chemical enterprise. In high-temperature and highly corrosive chemical environments, heat-resistant Titanium Plates are the 'core line of defence' that ensures stable production, rather than being 'alternative materials'.
Today, we will focus on two common types of heat-resistant titanium plate: TI-13V-11CR-3AL (a β-type Titanium Alloy) andGR2 (commercially pure titanium）. We will analyse their 'survival codes' in high-temperature chemical environments in terms of composition, corrosion mechanisms and practical applications.
Two Common Heat-Resistant Titanium Plates: Performance Differences and Applicable Scenarios
TI-13V-11CR-3AL: The 'Top Performer' in High-Temperature Strength
Composition: Based on titanium with the addition of 13% vanadium (V), 11% chromium (Cr) and 3% aluminium (Al). It belongs to the β-type titanium alloy with a body-centred cubic structure.
High-temperature performance: It can be used for long-term service at temperatures between 400 and 500°C, and the tensile strength at 450°C remains above 800 MPa (1.5 times that of GR2).
Corrosion advantages: The addition of chromium enhances corrosion resistance in oxidising acids (such as nitric acid and concentrated sulphuric acid), while vanadium improves resistance to stress corrosion cracking.
Application scenarios: This product is suitable for use with high-temperature reaction kettles (e.g. for polyester synthesis), high-temperature heat exchangers (e.g. for steam-medium heat exchange) and other applications requiring high strength.
Note: The oxides of Cr and V will dissolve in high-temperature concentrated alkalis (e.g. >50% NaOH), leading to an increase in corrosion rate, so such working conditions should be avoided.
GR2: The 'Corrosion Shield' of Commercially Pure Titanium
Composition: Commercially pure titanium (Gr. 2) with a titanium content of ≥99.6% and trace impurities (Fe and O). It belongs to the α-type of titanium with a hexagonal close-packed structure.
High-temperature performance: The long-term service temperature is ≤300°C, with a tensile strength of approximately 500 MPa at 300°C (lower than TI-13V-11CR-3AL, but meeting medium and low-temperature requirements).
Corrosion advantages: Known as the 'king' in chloride ion environments. In wet chlorine gas, hypochlorites and seawater, the corrosion rate of GR2 is less than 0.01 mm per year (one tenth of that of 316L stainless steel).
Application scenarios: Suitable for chlorine gas treatment equipment (e.g. linings of chlorine gas scrubbers), seawater desalination devices (e.g. reverse osmosis membrane modules), low-temperature acid storage tanks (e.g. hydrochloric acid storage) and other applications.
Note: in high-temperature halogen media (e.g. chlorine vapour at >300°C), the TiO₂ film can be easily penetrated, leading to pitting corrosion. Therefore, the temperature must be controlled.
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