Development and application of domestic medical titanium alloys and new titanium alloy materials

The surface treatment of titanium plates and titanium alloy plates has always been a problem that plagues various titanium manufacturers. With people’s deepening understanding of titanium, the processing technology has also been greatly improved.

After plasma nitriding (nitriding) of titanium plate and titanium alloy plate, its surface hardness, wear resistance and corrosion resistance in reducing media are greatly improved, and the original excellent comprehensive performance of the matrix is ​​maintained . In terms of plasma nitriding, my country's Guangzhou Research Institute of Nonferrous Metals has made remarkable achievements. For example, the bath heating coil used in hydrometallurgy, using ion-nitriding titanium alloy coil, is safe and has a long life. Another example is the neutralization pot stirring shaft sleeve of the key equipment for chemical extraction of phenol, which requires good sealing performance. The ion titanium nitride shaft sleeve is used to ensure the sealing performance, stable and normal production, and the safe operation time is extended by more than 10 times. For another example, the valve core and valve seat on the desulfurization lye circulation pipeline are made of 1Cr18Ni9Ti material and will be damaged after 18 days of use. The pneumatic valve core and valve seat using ion titanium nitride valve core have been used for more than three years and are still intact.

In natural gas exploitation, the high-pressure anti-sulfur gas production wellhead device is a high-pressure equipment that controls natural gas production. The key components of the wellhead flat valve sealing part, the valve plate and valve seat, require long-term work under high pressure (10~67MPa), and a short-term endurance of 30 ~80MPa pressure can be safe and reliable, open and close flexible, and resistant to acid media corrosion. In addition, the surface hardness of the material is required to be greater than 45HRC, strong abrasion resistance, high-speed air erosion resistance, high specific pressure abrasion resistance, low friction coefficient, low sealing specific pressure and other comprehensive properties. Choose titanium alloy TC4 and TA7 to manufacture flat valve sealing parts, and perform ion nitriding treatment to solve this problem
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