CN108165822B - Preparation method of TA2 cold-rolled titanium strip for low-strength and easy-to-form welded pipe - Google Patents

Preparation method of TA2 cold-rolled titanium strip for low-strength and easy-to-form welded pipe Download PDF

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Publication number
CN108165822B
CN108165822B CN201810138353.6A CN201810138353A CN108165822B CN 108165822 B CN108165822 B CN 108165822B CN 201810138353 A CN201810138353 A CN 201810138353A CN 108165822 B CN108165822 B CN 108165822B
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cold
titanium
welded pipe
titanium strip
rolling
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CN108165822A (en
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李渤渤
陶会发
刘茵琪
王非
陈涛
朱丹阳
申瑞
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Luoyang Sunrui Titanium Precision Casting Co Ltd
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Luoyang Sunrui Titanium Precision Casting Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C14/00Alloys based on titanium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22FCHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/02Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22FCHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/16Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
    • C22F1/18High-melting or refractory metals or alloys based thereon
    • C22F1/183High-melting or refractory metals or alloys based thereon of titanium or alloys based thereon

Abstract

A preparation method of a TA2 cold-rolled titanium strip for a low-strength easy-to-form welded pipe comprises the following steps: preparing raw materials, cold rolling, degreasing, continuously annealing, pickling, flattening, degreasing and sampling to obtain a TA2 cold-rolled titanium strip finished product for the welded pipe. This patent application passes through [ O ]]When in useThe method is characterized in that the whole content of raw material strengthening impurity elements is represented, a proper range is given, control is performed in the batching process, and meanwhile subsequent cold rolling, annealing and leveling process measures are combined to control the transverse yield strength of the TA2 cold-rolled titanium strip for the welded pipe to be in a lower level of 260-350 MPa, the forming resistance of the welded pipe is effectively reduced, the friction force between the titanium strip and a forming roller die of the welded pipe is further reduced, the adhesion between the titanium strip and the forming roller die is reduced by improving the surface hardness and the roughness of the titanium strip, the service life of the forming roller of the welded pipe is greatly prolonged, and the quality problem of the forming grinding mark on the surface of the titanium welded pipe is solved.

Description

Preparation method of TA2 cold-rolled titanium strip for low-strength and easy-to-form welded pipe
Technical Field
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
The titanium material has the advantages of high specific strength, corrosion resistance and the like. Compared with a seamless pure titanium pipe, the welded pipe can be used for producing a thin-wall pipe with the thickness of 0.3-1.0 mm, the production efficiency and the yield are high, the cost is low, the production length is not limited, the mass stable production can be realized, the heat exchange efficiency is high, the titanium material investment of equipment is saved, and the welded pipe can be widely applied to civil industries such as electric power, seawater desalination, chemical engineering and the like. The TA2 cold-rolled titanium strip is prepared by using a TA2 plate blank and processing the plate blank through the working procedures of hot rolling, cold rolling, annealing, finishing and the like, the TA2 plate blank is usually prepared by batching and smelting according to the element range of GB/T3620.1 titanium and titanium alloy brand and chemical composition, namely the weight percentage control range of strengthening impurity elements is that Fe is less than or equal to 0.30%, C is less than or equal to 0.08%, N is less than or equal to 0.03%, O is less than or equal to 0.25%, the strength of the cold-rolled titanium strip is improved along with the improvement of the content of the impurity elements, and the transverse yield strength range of the generally prepared TA2 cold-rolled titanium strip is 260-450 MPa.
The TA2 welded pipe is formed by welding a TA2 cold-rolled titanium belt through multiple groups of forming roller dies after gradual transverse cold bending deformation. However, the titanium strip has high resilience and high forming resistance, and particularly when the transverse yield strength of the titanium strip is in a higher range of 350-450 MPa, forming is particularly difficult, friction between the titanium strip and a forming roller mold is high, and pure titanium has high adhesion, so that the surface of a welded pipe is poor in quality and even scrapped, and the forming roller mold has high forming resistance, friction and titanium strip adhesion, so that the forming roller mold is short in service life after being polished every time, a roller needs to be replaced and repaired frequently, the production speed of a welded pipe production line is reduced, the quality and the production efficiency of the welded pipe are greatly influenced, and the titanium strip forming roller mold becomes a main bottleneck for titanium welded pipe production enterprises and needs to be improved.
The patent CN 104032247B discloses a production method of a precision cold-rolled titanium strip for a condenser welded tube, which comprises the steps of adopting a cold-rolled pure titanium coiled material, rolling a semi-finished product, degreasing, cleaning, carrying out vacuum annealing treatment, flattening, straightening and the like to obtain the cold-rolled titanium strip with the surface roughness of 0.15-0.30 mu m; patent CN 102310314B discloses a method for processing titanium and titanium alloy strip coils, which comprises the steps of preparing cold-rolled titanium strip coils by a method of raw material-heating-rolling-annealing-shot blasting-coping-acid pickling-cold rolling-degreasing-vacuum annealing-straightening or flattening-trimming-product. Although the two patents provide the basic technology for preparing the TA2 cold-rolled titanium strip, the problems of high transverse yield strength, small surface roughness and large resistance to welded pipe forming of the titanium strip still exist, so that the produced titanium welded pipe is easy to generate grinding mark defects on the surface, the service life of a forming roller die is short, and the production speed of a welded pipe production line is low, so that the industrial batch production and use effect for preparing the TA2 welded pipe is not ideal.
Disclosure of Invention
The invention aims to solve the problems that the surface of a produced titanium welded pipe is easy to generate grinding marks due to high transverse yield strength, small surface roughness and high resistance to welding pipe forming, the forming roller mold has short service life and the production speed of a welding pipe production line is low, and provides a preparation method of a TA2 cold-rolled titanium belt for a low-strength easy-to-form welded pipe. The method can obtain the TA2 cold-rolled titanium strip which is very suitable for forming the welded pipe, and the titanium welded pipe produced by using the titanium strip has the advantages of high production efficiency and good appearance quality.
In order to solve the technical problems, the invention adopts the technical scheme that:
a preparation method of a TA2 cold-rolled titanium strip for a low-strength easy-to-form welded pipe comprises the following steps:
step one, raw material preparation: taking sponge titanium as a main material and titanium dioxide as an auxiliary material, pressing the sponge titanium and the titanium dioxide into electrodes, and defining the impurity element contents of Fe, C, N and O in the auxiliary material as [ Fe ] by mass percentage]%、[C]%、[N]%、[O]% of the formula]When in useUsed for representing the whole content of the impurity elements in the ingredients, the impurity elements in the ingredients meet the following conditions:
[O]when in use=[O]%+0.5*[Fe]%+0.7*[C]%+2.5*[N]%=0.10~0.20%,
Then sequentially carrying out smelting, forging, hot rolling, cold rolling and annealing processes on the pressed electrode to obtain an annealing state TA2 cold-rolled titanium strip blank with the thickness of 0.6-2.5 mm;
step two, cold rolling: taking the titanium belt blank prepared in the step one, cold-rolling the TA2 titanium belt blank by using a cold-rolling unit, controlling the cold-rolling deformation to be 40-80%, and cold-rolling the TA2 titanium belt blank to 0.3-1.0 mm to obtain a semi-finished titanium belt for later use;
step three, degreasing: continuously cleaning and drying the semi-finished titanium strip in the step two by using a degreasing unit to prepare a dry and clean cold-rolled titanium strip coil without oil stains on the surface for later use;
step four, continuous annealing: the cold-rolled titanium strip coil in the third step is subjected to flattening treatment by adopting a continuous annealing line protected by argon, the cold-rolled titanium strip coil subjected to flattening treatment is subjected to connecting line annealing treatment, the flattening treatment can be performed on the titanium strip by adopting a continuous annealing mode so as to realize single-layer direct continuous heating, the problems of low overall direct heating and cooling efficiency in the traditional titanium coil cover type annealing are solved, the annealing temperature is 600-750 ℃, and the annealing heat preservation time is 1-5 min;
step five, acid washing: pickling the titanium belt subjected to the continuous annealing treatment in the fourth step by using mixed acid liquor, and drying;
step six, leveling: and (3) carrying out flattening rolling on the titanium belt treated in the step five by using a flattening machine, controlling a roller of the flattening machine to carry out laser texturing in advance, wherein the roughness of the roughened roller is 0.5-4 mu m, the rolling reduction of the flattening rolling is 0.5-2%, carrying out flattening treatment on the titanium belt after the roller of the flattening machine is roughened, and transferring and forming a textured surface on the surface of the titanium belt to improve the roughness, wherein the surface roughness of the titanium belt is 20-50% of the roughness of the texturing roller generally. The flattening treatment is also used for improving the surface hardness of the titanium strip coil;
step seven, degreasing and sampling: and (4) carrying out degreasing treatment on the titanium strip treated in the step six by repeating the degreasing method in the step three to obtain a finished product of the TA2 cold-rolled titanium strip for the welded pipe.
The mixed acid liquid is a mixture of hydrofluoric acid, nitric acid and water, wherein the mass concentration of the hydrofluoric acid is 1.5-3%, the mass concentration of the nitric acid is 12-20%, and the balance is water.
And in the third step, the degreasing speed of the semi-finished titanium belt is 5-10 m/min, the temperature of the degreasing liquid is 40-65 ℃, and the temperature of the drying box is 40-60 ℃.
The invention has the beneficial effects that:
1. this patent application passes through [ O ]]When in useThe overall content of the raw material strengthening impurity elements is represented, a proper range is given, the control is carried out in the batching process, and meanwhile, the follow-up cold rolling, annealing and flattening process measures are combined to realize the TA2 cold rolling titanium for controlling welded pipesThe transverse yield strength of the belt is in a lower level of 260-350 MPa, the forming resistance of the welded pipe is effectively reduced, and further the friction force between the titanium belt and the welded pipe forming roller mold is reduced, so that the service life of the welded pipe forming roller is greatly prolonged.
2. By using the laser texturing roller to perform smooth rolling with small rolling reduction, the surface hardness and the roughness are simultaneously improved, the surface hardness reaches over 160HV0.5, the roughness reaches 0.3-1.0 μm, the adhesion of a titanium belt and a forming roller mold is obviously reduced, and the quality problem of the forming grinding mark defect on the surface of the titanium welded pipe is effectively solved.
3. The TA2 cold rolling titanium strip production welded pipe prepared by the patent technology is easier to form, is not easy to have surface grinding mark defects, has low requirements on the main operation and debugging skills of a welded pipeline and the design and manufacturing capability of a mould, has good production adaptability, reduces the production difficulty of the welded pipe, and has stable and reliable quality.
4. The welded pipe titanium strip produced by the welding pipe titanium strip produced by the patent technology has the advantages of high production speed of a production line, long service life of a forming roller die, stable quality and low rejection rate, and therefore, the welded pipe titanium strip has the advantages of good appearance quality, high production efficiency and low production cost.
Detailed Description
The specific implementation mode is as follows:
example 1: using titanium sponge and TiO2The ingredients are carried out, the content of impurity elements of O, Fe, C and N after the ingredients are respectively 0.125 percent, 0.018 percent, 0.017 percent and 0.01 percent by mass, and the percentage of O]When in use=[O]%+0.5*[Fe]%+ 0.7*[C]%+2.5*[N]The percent of the titanium alloy is 0.125% +0.5 × 0.018% +0.7 × 0.017% +2.5 × 0.01% =0.1709%, and the pure titanium cold-rolled titanium strip blank with the thickness of 1.0mm in an annealed state TA2 is obtained through the processes of smelting, forging, hot rolling, cold rolling, annealing and the like; cold rolling the titanium strip blank by using a cold rolling unit to a target thickness of 0.404mm, wherein the cold rolling deformation is 59.6%; cleaning and drying the cold-rolled titanium strip by using a degreasing unit; flattening annealing is carried out on the cold-rolled titanium strip by adopting an argon protection continuous annealing line, the annealing temperature is 720 ℃, and the heat preservation time is 4 min; pickling the continuously annealed cold-rolled titanium strip by using a mixed acid solution of hydrofluoric acid, nitric acid and water, and drying; then, a laser texturing roller with the roughness of 2.0 mu m is adopted to carry out flattening rolling on the titanium beltAnd (3) flattening, wherein the flattening rolling reduction is 0.8%, degreasing and sampling are carried out after flattening, and the performance and the surface roughness of the obtained TA2 cold-rolled titanium strip coil are shown in Table 1.
Comparative example 1: the impurity elements of O, Fe, C and N are respectively 0.13%, 0.08%, 0.017% and 0.015% in mass percentage, and [ O ]]When in useThe preparation of 0.4mm cold-rolled titanium strip is carried out on the raw materials of which the proportion is not =0.2194%, the flat rolling of a finished product is not carried out on the finished product after annealing, and the performance and the surface roughness of the obtained titanium strip are shown in table 1.
As can be seen from the table 1, in the example 1, the TA2 cold-rolled titanium strip with the thickness of 0.4mm and suitable for welded pipe forming is obtained by adopting the technology, the strength of the titanium strip is controlled below 350MPa, and meanwhile, the surface hardness and the roughness of the titanium strip are obviously improved by carrying out smooth rolling through the laser texturing roller. In a comparative example 1, the titanium belt blank with the components beyond the range of the components in the patent is used for preparing the titanium belt, and the titanium belt obtained is high in transverse yield strength, low in surface hardness and small in surface roughness without being subjected to smooth rolling treatment by a roughing roller. Compared with the comparative example 1, the titanium belt obtained in the example 1 has low transverse yield, high surface hardness and large roughness, effectively reduces the forming resistance of the welded pipe, improves the surface wear resistance, has no forming wear mark defect, prolongs the service life of the welded pipe forming roller die from 35 to 80 kilometers after being polished each time, is easier to form the welded pipe, improves the production efficiency of a production line by more than 20 percent, and has remarkable advantages.
Table 1 comparison table of production and use effects of cold-rolled titanium strip welded pipes in example 1 and comparative example 1
Example 2: using titanium sponge and TiO2The ingredients are carried out, the content of O, Fe, C and N impurity elements after the ingredients are respectively 0.085 percent, 0.031 percent, 0.012 percent and 0.006 percent in percentage by mass, and the percentage is [ O]When in use=[O]%+0.5*[Fe]% +0.7*[C]%+2.5*[N]The percentage of the titanium alloy strip material is not less than 0.085% +0.5 × 0.031% +0.7 × 0.012% +2.5 × 0.006% =0.1239%, and the pure titanium cold-rolled titanium strip material with the thickness of 2.0mm in an annealed state TA2 is obtained through the processes of smelting, forging, hot rolling, cold rolling, annealing and the like; cold rolling the titanium strip blank to a target thickness of 0.709 mm using a cold rolling unitRolling deformation is 64.6%; cleaning and drying the cold-rolled titanium strip by using a degreasing unit; flattening annealing is carried out on the cold-rolled titanium strip by adopting an argon protection continuous annealing line, the annealing temperature is 680 ℃, and the heat preservation time is 3 min; pickling the continuously annealed cold-rolled titanium strip by using a mixed acid solution of hydrofluoric acid, nitric acid and water, and drying; then, a laser texturing roller with the roughness of 2.5 mu m is adopted to carry out flattening rolling on the titanium strip, the flattening rolling reduction is 1.2%, degreasing and sampling are carried out after flattening, and the performance and the surface roughness of the obtained TA2 cold-rolled titanium strip coil are shown in Table 2.
Comparative example 2: the same ingredients and materials and processing techniques as in example 2 were used to prepare TA2 cold rolled titanium strip for welded pipe, but the finished product was not subjected to laser roughing roll temper rolling, and the properties and surface roughness of the obtained titanium strip are shown in table 2.
As can be seen from the table 2, in the example 2, the TA2 cold-rolled titanium strip with the thickness of 0.7mm and suitable for welded pipe forming is obtained by adopting the technology, the strength of the titanium strip is controlled to be below 350MPa, and meanwhile, the surface hardness and the roughness are obviously improved by carrying out smooth rolling through the laser texturing roller. The cold-rolled titanium strip with the same specification prepared in the comparative example 2 is not subjected to the flat rolling of a finished product roughing roller, although the transverse yield strength is lower, the surface hardness is low, the roughness is small, the surface wear resistance is poor, the titanium strip has strong adhesion with a forming roller die in the process of producing welded pipes, the defect of forming grinding marks on the surfaces of the welded pipes is easy to occur, the roller needs to be frequently repaired in the production process, and the service life of the welded pipe forming roller die is short. Compared with the comparative example 2, the problem is solved in the example 2, the TA2 cold-rolled titanium strip prepared in the example 2 is used for producing the welded pipe, the surface has no forming grinding mark defect, the adhesion between the titanium strip and the forming roller die is reduced, the service life of the welded pipe forming roller die is prolonged from 40 to 75 kilometers after being polished each time, the quality in the production process is extremely small, the production efficiency is high, and the advantages are obvious.
Table 2 comparison table of production and use effects of cold-rolled titanium strip welded pipes in example 2 and comparative example 2
The technical solutions and embodiments of the present invention are not limited, and the same solutions or effects as those of the technical solutions and embodiments of the present invention are within the scope of the present invention.

Claims (3)

1. A preparation method of a TA2 cold-rolled titanium strip for a low-strength easy-to-form welded pipe is characterized by comprising the following steps: the method comprises the following steps:
step one, raw material preparation: taking sponge titanium as a main material and titanium dioxide as an auxiliary material, pressing the sponge titanium and the titanium dioxide into electrodes, and defining the impurity element contents of Fe, C, N and O in the auxiliary material as [ Fe ] by mass percentage]%、[C]%、[N]%、[O]% of the formula]When in useUsed for representing the whole content of the impurity elements in the ingredients, the impurity elements in the ingredients meet the following conditions:
[O]when in use=[O]%+0.5*[Fe]%+0.7*[C]%+2.5*[N]%=0.10~0.20%,
Then sequentially carrying out smelting, forging, hot rolling, cold rolling and annealing processes on the pressed electrode to obtain an annealing state TA2 cold-rolled titanium strip blank with the thickness of 0.6-2.5 mm;
step two, cold rolling: taking the titanium belt blank prepared in the step one, cold-rolling the TA2 titanium belt blank by using a cold-rolling unit, controlling the cold-rolling deformation to be 40-80%, and cold-rolling the TA2 titanium belt blank to 0.3-1.0 mm to obtain a semi-finished titanium belt for later use;
step three, degreasing: continuously cleaning and drying the semi-finished titanium strip in the step two by using a degreasing unit to prepare a dry and clean cold-rolled titanium strip coil without oil stains on the surface for later use;
step four, continuous annealing: opening and leveling the cold-rolled titanium strip coil in the third step by adopting a continuous annealing line protected by argon, and continuously annealing the cold-rolled titanium strip coil subjected to the opening and leveling treatment at the annealing temperature of 600-750 ℃ for 1-5 min;
step five, acid washing: pickling the titanium belt subjected to the continuous annealing treatment in the fourth step by using mixed acid liquor, and drying;
step six, leveling: carrying out temper rolling on the titanium belt treated in the step five by using a temper mill, carrying out laser texturing on a roller of the temper mill, wherein the roughness of the roughened roller is 0.5-4 mu m, and then carrying out temper rolling, wherein the temper rolling reduction is controlled to be 0.5-2%;
step seven, degreasing and sampling: and (4) carrying out degreasing treatment on the titanium strip treated in the step six by repeating the degreasing method in the step three to obtain a finished product of the TA2 cold-rolled titanium strip for the welded pipe.
2. The method for preparing the TA2 cold-rolled titanium strip for the low-strength easy-to-form welded pipe as claimed in claim 1, wherein the method comprises the following steps: the mixed acid liquid is a mixture of hydrofluoric acid, nitric acid and water, wherein the mass concentration of the hydrofluoric acid is 1.5-3%, the mass concentration of the nitric acid is 12-20%, and the balance is water.
3. The method for preparing the TA2 cold-rolled titanium strip for the low-strength easy-to-form welded pipe as claimed in claim 1, wherein the method comprises the following steps: and in the third step, the degreasing speed of the semi-finished titanium belt is 5-10 m/min, the temperature of the degreasing liquid is 40-65 ℃, and the temperature of the drying box is 40-60 ℃.
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CN109797313A (en) * 2018-12-19 2019-05-24 洛阳双瑞精铸钛业有限公司 A kind of cookware punching press titanium volume and preparation method thereof
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