Method for producing seamless titanium and titanium alloy welded pipe

Abstract

The invention relates to a method for producing a seamless titanium and titanium alloy welded pipe. By the method, the welded pipe is obtained by welding a pipe material on an automatic precise welded pipe production line; and particularly, the production method comprising the step of performing one-time or repeated cold rolling-thermal treatment on the welded pipe. The cold rolling-thermal treatment process comprises the following steps of: (1) cold-rolling the welded pipe by using a multi-roller pipe milling machine, and lubricating the inner and outer surfaces of the pipe material in the cold rolling process, wherein the total machining rate of a cold-rolling finished product is controlled to 50 to 70 percent, the machining rate in all processes is controlled to 15 to 50 percent, and a cold rolling process is performed for 2 to 3 times; (2) after the cold rolling process, degreasing the pipe material, and cleaning; and (3) annealing the degreased and cleaned pipe material in a vacuum annealing furnace. By the method, the seamless welded pipe can be obtained; and the method is high in production efficiency, low in cost and light in environmental pollution.

Description

technical field [0001] The invention relates to a production method of a titanium and titanium alloy welded pipe, in particular, the method can realize the seamless effect of the welded pipe. Background technique [0002] Titanium and titanium alloy pipes mainly include welded pipes and seamless pipes. The processing technology of seamless pipes is complex, requires multiple repetitions, low yield, long production cycle, low production efficiency, large floor area, many operators, degreasing and pickling will pollute the environment, and the number of vacuum heat treatments is high. The consumption is high, and continuous production is not possible, especially the production of thin-walled and super-long pipes is difficult and the cost is high. Seamless pipes are suitable for high-temperature, high-pressure, corrosive environments and other occasions with high requirements. [0003] At present, the production method of welded pipe is generally cold-rolled titanium strip ex...

AI Technical Summary

Problems solved by technology

The weld seam and its heat-affected zone of the welded pipe are in the cast state, with coarse grains, which are different from the base metal. The welded pipe can meet various heat exchange requirements in power plant condensers and seawater desalination devices, but for those with high environmental requirements Occasion does not apply

Images