Process technique of high-strength titanium alloy pipes

Abstract

The invention relates to a processing technology of high-strength titanium alloy tubes, belonging to the material processing technical field. The processing technology follows the steps below: first, making the vacuum secondary smelting TB2 alloy ingot into 380mm diameter through cogging-forging and hot-rolling, getting a TB2 rolling rod; second, processing the TB2 rolling rod to obtain 52 mm to 54 mm smooth rod in Diameter by bar drawing machine, heating up to 950 to 1000 degree C, keeping the temperature for 30 to 50 minute, rotary piercing on the two-roller rotary piercing machines, obtaining a tube blank of outside diameter from 55mm to 58mm, insid diameter from 39mm to 42 mm; third, make the rotary piercing tube blank process heating up to 770 to 800 degree C, keeping the temperature for 30minute to 50minute, air-cooled annealing and sandblasting, removal of the oxidation scale of the internal and external surface at the process of acid washing, obtaining a cold rolling tube blank; fourth, processing the cold-rolled tube blank with 6 pass cold rolling of the LD60 cold-rolling tube mill, the intermediate annealing temperature is from 760 to 790 degree C, obtaining a finished tube.

Description

technical field [0001] The invention belongs to the field of material processing, in particular to a processing technology for high-strength titanium alloy pipes. Background technique [0002] It is quite difficult to process titanium alloy pipes with high room temperature strength and deformation resistance, medium pipe diameter, certain length and wall thickness, considering the pipe processing technology. The technical difficulty lies in: if the hot extrusion method is used to prepare high-strength tube blanks, the deformation resistance is large and the thermal processing temperature is high. If the traditional copper-clad extrusion is used, due to the eutectic reaction of titanium and copper at about 880 ° C, the formation of The eutectic brittle phase makes it difficult to guarantee the quality of the extruded tube billet. At the same time, for larger-sized extrusion billets, larger-tonnage extruders are needed for extrusion, and general units do not have this kind of...

AI Technical Summary

Problems solved by technology

The technical difficulty lies in: if the hot extrusion method is used to prepare high-strength tube blanks, the deformation resistance is large and the thermal processing temperature is high. If the traditional copper-clad extrusion is used, due to the eutectic reaction of titanium and copper at about 880 ° C, the formation of Eutectic brittle phase, the quality of the extruded tube is difficult to guarantee

At the same time, for larger-sized extrusion billets, larger-tonnage extruders are needed for extrusion, and general units do not have this kind of equipment; in addition, forging rods are used to make deep holes to prepare tube blanks. Due to the high price of titanium alloys, The material utilization rate of this method is low, and the processing rate of the material is small, which is not conducive to improving the performance of the material

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