TA10 Titanium pipe
TA10 Titanium pipe
The nominal chemical composition of TA10 titanium alloy is Ti-0.3Mo-0.8Ni (wt%), which is a kind of near-α titanium alloy. Its trace elements molybdenum and nickel can form a cathode overvoltage lower than pure titanium, which obviously improves industrial purity. Titanium's resistance to crevice corrosion and pitting corrosion is rich in raw material resources and low cost compared with titanium alloys of other components. It is widely used in the chemical industry and vacuum salt industry. In addition, TA10 titanium alloy also has the characteristics of stable structure, strong oxidation resistance, good weldability and high plasticity.
Preparation of titanium alloy seamless pipe by cross rolling
The processing technology of titanium and titanium alloy seamless tube blanks mainly includes extrusion method and cross-rolling perforation method. TA10 titanium alloy industrial production of tube blanks is mainly based on extrusion, and there are few reports on cross-rolling and perforation [4]. Compared with the extrusion production seamless pipe, the cross-rolling perforation method not only has a short process and high efficiency, but also improves the material utilization rate, reduces the cost, and conforms to the concept of energy conservation and environmental protection. The company adopts two-roll cross-rolling and perforating process to prepare TA10 titanium alloy seamless pipe, and explores the heat treatment process of seamless pipe to obtain the pipe with comprehensive mechanical properties.
The diameter of the rod used is φ310mm, and the chemical composition (see Table 1) meets the requirements of GB/T3620.1-2007. The β phase transition temperature was measured by differential thermal analysis to be 886 °C. The core hole is pre-formed before the heating of the bar blank, and then the surface is coated with an anti-oxidation coating, heated and held for a certain time by using an electric resistance furnace, and then a two-roll cross-rolling punching machine is used for the through-rolling of the seamless pipe to obtain φ325 mm×12 mm. Pipe.
Microstructure and mechanical properties of cross-rolled perforated seamless tubes
Figure 2 is a metallographic photograph of the outer surface of the TA10 titanium alloy cross-rolled tube. The oxide layer on the outer surface can be observed from the figure. The thickness of the oxide layer is measured between 0.22 and 0.30 mm. It can be seen that the coating protection is effectively controlled. The surface oxidation of titanium alloy at high temperatures. Figure 2 shows the microstructure of the perforated tube, which is a sheet of α+β tissue, which is closely related to the perforation process. In actual production, during the heating and heat preservation process of the bar blank, the heating furnace is faulty, resulting in a higher heating temperature of the bar blank before perforation, which has exceeded the phase transition point, and the heat generated by the deformation during the perforation process causes a local temperature rise, and then the air cooling is adopted. Recovery and recrystallization occur during cooling to obtain a coarse Wei's structure. Table 2 shows the room temperature mechanical properties of the pipe after cross-rolling. Table 3 shows the room temperature mechanical properties of the TA10 seamless pipe specified in GB/T3624-2010 "Titanium and Titanium Alloy Seamless Pipe". It can be seen from comparison that the cross-rolling method The prepared seamless tube has good plasticity and low strength.
The nominal chemical composition of TA10 titanium alloy is Ti-0.3Mo-0.8Ni (wt%), which is a kind of near-α titanium alloy. Its trace elements molybdenum and nickel can form a cathode overvoltage lower than pure titanium, which obviously improves industrial purity. Titanium's resistance to crevice corrosion and pitting corrosion is rich in raw material resources and low cost compared with titanium alloys of other components. It is widely used in the chemical industry and vacuum salt industry. In addition, TA10 titanium alloy also has the characteristics of stable structure, strong oxidation resistance, good weldability and high plasticity.
Preparation of titanium alloy seamless pipe by cross rolling
The processing technology of titanium and titanium alloy seamless tube blanks mainly includes extrusion method and cross-rolling perforation method. TA10 titanium alloy industrial production of tube blanks is mainly based on extrusion, and there are few reports on cross-rolling and perforation [4]. Compared with the extrusion production seamless pipe, the cross-rolling perforation method not only has a short process and high efficiency, but also improves the material utilization rate, reduces the cost, and conforms to the concept of energy conservation and environmental protection. The company adopts two-roll cross-rolling and perforating process to prepare TA10 titanium alloy seamless pipe, and explores the heat treatment process of seamless pipe to obtain the pipe with comprehensive mechanical properties.
The diameter of the rod used is φ310mm, and the chemical composition (see Table 1) meets the requirements of GB/T3620.1-2007. The β phase transition temperature was measured by differential thermal analysis to be 886 °C. The core hole is pre-formed before the heating of the bar blank, and then the surface is coated with an anti-oxidation coating, heated and held for a certain time by using an electric resistance furnace, and then a two-roll cross-rolling punching machine is used for the through-rolling of the seamless pipe to obtain φ325 mm×12 mm. Pipe.
Microstructure and mechanical properties of cross-rolled perforated seamless tubes
Figure 2 is a metallographic photograph of the outer surface of the TA10 titanium alloy cross-rolled tube. The oxide layer on the outer surface can be observed from the figure. The thickness of the oxide layer is measured between 0.22 and 0.30 mm. It can be seen that the coating protection is effectively controlled. The surface oxidation of titanium alloy at high temperatures. Figure 2 shows the microstructure of the perforated tube, which is a sheet of α+β tissue, which is closely related to the perforation process. In actual production, during the heating and heat preservation process of the bar blank, the heating furnace is faulty, resulting in a higher heating temperature of the bar blank before perforation, which has exceeded the phase transition point, and the heat generated by the deformation during the perforation process causes a local temperature rise, and then the air cooling is adopted. Recovery and recrystallization occur during cooling to obtain a coarse Wei's structure. Table 2 shows the room temperature mechanical properties of the pipe after cross-rolling. Table 3 shows the room temperature mechanical properties of the TA10 seamless pipe specified in GB/T3624-2010 "Titanium and Titanium Alloy Seamless Pipe". It can be seen from comparison that the cross-rolling method The prepared seamless tube has good plasticity and low strength.
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