Titanium and titanium alloy in organic compounds, except the temperature higher than the five organic acids (formic acid, acetic acid, oxalic acid, trichloroacetic acid and trifluoroacetic acid), have very good stability.Therefore, titanium is an excellent structural material in petroleum refining and petrochemical industry, and can be used to make various reactors, pressure vessels, heat exchangers, separator piping, distillation tower top condenser lining and so on.
In oil and gas drilling and production, titanium drilling and production equipment is used in Britain in the condition of 5% H2S and 25% NaCl at a depth of 600m and 262 ° c.The former Soviet union used titanium pump, titanium valve and titanium flushing brine equipment.In order to solve the corrosion of H2S, C02 and water vapor at 600-700atm in natural gas wellhead, the valve plate, seat and stem of ti-6al -- 4V are used in our country.
Offshore oil and gas exploitation must endure seawater corrosion and stress corrosion for a long time.Ti-6al-4v is widely used abroad as the high pressure pump, riser and connector of oil platform support, rope support and seawater circulating and pressurizing system.Because ti-6a1-4v is not only resistant to seawater corrosion, but also has high toughness, high yield strength and high fatigue limit.Recently, prestress production pipe joints made of titanium have been selected abroad. The joints are easy to assemble, light in weight and have elastic sealing property. Titanium is the best material.China's offshore oil industry is entering a stage of large-scale development. At present, the structural components, key components and equipment of the platform are imported from abroad, while domestic materials are seldom used.But expect titanium to find a big market here.