Types and Applications Of Titanium Alloys For Marine Engineering
1. Low-Strength Titanium Alloy (Yield Strength Below 490MPa)
1.1 Ti31
A new type of high-temperature, corrosion-resistant and hydrogen-brittle titanium alloy developed by Northwest Institute of Non-Ferrous Metals. It can be used in a high temperature environment of 300-400℃, and it is easy to process into plates, rods, tubes and other products.
1.2 TA10
The near-α-type low-strength titanium alloy has good corrosion resistance and can replace the higher-cost Ti-0.2Pd alloy and be used in marine engineering equipment.
Application areas: offshore oil and gas and seawater desalination fields, such as plate-a tube heat exchangers, pipelines, condensers, valves, etc.
2. Medium-Strength Titanium Alloy (Yield Strength Between 490-790MPa)
2.1 Ti70
Near-α-type titanium alloy has good corrosion resistance, strong sound permeability, non-magnetic, and good cold forming processability and weldability. The alloy has excellent mechanical properties, the tensile strength of the sheet is greater than 700MPa, and the elongation is greater than 20%.
2.2 TA17
Near-α-type titanium alloy has excellent welding properties, resistance to seawater corrosion, and high static strength and cyclic load strength.
Application areas: diversion shroud, submarine shell, four-way water polo valve, etc.
3. High-Strength Titanium Alloy (Yield Strength Above 790MPa)
3.1 TC4(Ti-6Al-4V, Ti Grade 5)
At present, it is the most commonly used high-strength titanium alloy in marine engineering equipment.
3.2 TC4 ELI(Ti-6Al-4V ELI, Ti Grade 5 ELI, Ti Grade 23)
The fatigue crack-spreading resistance of the alloy is better than that of TC4 titanium alloy with isometric organization.
3.3 Ti80
The 875MPa grade α+β titanium alloy developed by Shanghai Institute of Steel Research has excellent properties such as high strength, high toughness and good corrosion resistance.
Application areas: Preparation of pressure-resistant structural parts such as drill pipes, submersible ball shells, fasteners, etc.
