Preparation method of TA2 cold-rolled titanium strip for low-strength and easily-formed welded pipe

A low-strength, forming welding technology, applied in the field of titanium material processing, can solve the problems of prolonging the service life of the welded pipe forming roller mold, easy to produce wear marks on the surface of the titanium welded pipe, short service life of the forming roller mold, etc., and meeting the requirements of mold design and manufacturing capacity. Reduced, good production adaptability, long mold life effect

Active Publication Date: 2018-06-15
LUOYANG SUNRUI TI PRECISION CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the surface of the produced titanium welded pipe is prone to wear marks due to the high transverse yield strength, small surface roughness, and large welded pipe forming resistance of the titanium strip, and the service life of the forming roller mold is short, and the production speed of the welded pipe production line is low. To solve the problem, a preparation method of TA2 cold-rolled titanium strip for low-strength and easy-to-form welded pipe is provided. By controlling the content of impurity elements in the billet and optimizing the preparation process of the titanium strip, the low yield strength and high surface area of ​​the titanium strip are realized. The hardness and roughness control effectively reduces the forming resistance of the titanium strip welded pipe, greatly prolongs the service life of the welded pipe forming roller mold, solves the quality problem of the surface forming wear marks of the titanium welded pipe, and improves the production speed of the welded pipe production line

Method used

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  • Preparation method of TA2 cold-rolled titanium strip for low-strength and easily-formed welded pipe
  • Preparation method of TA2 cold-rolled titanium strip for low-strength and easily-formed welded pipe

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Embodiment 1

[0025] Embodiment 1: using sponge titanium and TiO 2 Carry out batching, after batching O, Fe, C, N impurity element content mass percent is respectively 0.125%, 0.018%, 0.017%, 0.01%, [O] 当 =[O]%+0.5*[Fe]%+ 0.7*[C]%+2.5*[N]%=0.125%+0.5*0.018%+0.7* 0.017%+2.5*0.01%=0.1709%, and after Smelting, forging, hot rolling, cold rolling, annealing and other processes to obtain a 1.0mm annealed TA2 pure titanium cold-rolled titanium strip blank; use a cold rolling mill to cold-roll the titanium strip blank to a target thickness of 0.404mm, The cold-rolled deformation is 59.6%; the degreasing unit is used to clean and dry the cold-rolled titanium strip; the argon-protected continuous annealing line is used to perform Kaiping annealing on the cold-rolled titanium strip, the annealing temperature is 720 degrees Celsius, and the holding time is 4 minutes; Acid + nitric acid + water" mixed acid solution pickled the cold-rolled titanium strip after continuous annealing, and dried it; then us...

Embodiment 2

[0030] Embodiment 2: Using sponge titanium and TiO 2 Carry out batching, O, Fe, C, N impurity element content mass percent after batching is respectively 0.085%, 0.031%, 0.012%, 0.006%, [O] 当=[O]%+0.5*[Fe]% +0.7*[C]%+2.5*[N]%=0.085%+0.5*0.031%+0.7*0.012%+2.5*0.006%=0.1239%, and after Smelting, forging, hot rolling, cold rolling, annealing and other processes to obtain a 2.0mm annealed TA2 pure titanium cold-rolled titanium strip blank; use a cold rolling mill to cold-roll the titanium strip blank to a target thickness of 0.709 mm, The cold-rolled deformation is 64.6%; the degreasing unit is used to clean and dry the cold-rolled titanium strip; the argon-protected continuous annealing line is used to perform Kaiping annealing on the cold-rolled titanium strip, the annealing temperature is 680 degrees Celsius, and the holding time is 3 minutes; Acid + nitric acid + water" mixed acid solution pickled the cold-rolled titanium strip after continuous annealing, and dried it; then u...

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Abstract

A preparation method of a TA2 cold-rolled titanium strip for a low-strength and easily-formed welded pipe comprises the following steps that raw material preparation, cold rolling, degreasing, continuous annealing, acid pickling, flattening and degreasing sampling are conducted, and then a finished TA2 cold-rolled titanium strip for the welded pipe is obtained. The overall content of raw materialstrengthened impurity elements is presented through [O]<dang>, an appropriate range is provided, control is conducted in the compounding process, and meanwhile subsequent cold rolling, annealing and flattening technique measures are combined, so that the transverse yield strength of the TA2 cold-rolled titanium strip for the welded pipe is controlled to be in a low level of 260-350 MPa, the forming resistance of the welded pipe is reduced effectively, and accordingly friction between the titanium strip and a welded pipe forming roller mould is reduced; and by improving the surface hardness androughness of the titanium strip, the adhesivity of the titanium strip and the forming roller mould is reduced, accordingly, the service life of a welded pipe forming roller is prolonged by a large margin, and the quality problem of forming grinding crack defects on the surface of the titanium welded pipe is solved.

Description

technical field [0001] The invention relates to a titanium material processing technology, in particular to a preparation method of a TA2 cold-rolled titanium strip for a low-strength, easy-to-form welded pipe. Background technique [0002] Titanium has the advantages of high specific strength and corrosion resistance. Compared with seamless pure titanium pipes, welded pipes can produce 0.3~1.0mm thin-walled pipes, with high production efficiency and yield, low cost, unlimited production length, stable batch production, high heat exchange efficiency, and equipment saving Titanium investment is widely used in civil industries such as electric power, seawater desalination, and chemical industry. TA2 cold-rolled titanium strip is prepared by using TA2 slabs, which are processed by hot rolling, cold rolling, annealing, finishing and other processes. Usually, TA2 slabs are used in accordance with GB / T3620.1 "Titanium and titanium alloy grades and The range of elements in the ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22F1/18C22F1/02
CPCC22C14/00C22F1/02C22F1/183
Inventor 李渤渤陶会发刘茵琪王非陈涛朱丹阳申瑞
Owner LUOYANG SUNRUI TI PRECISION CASTING
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