CN104324974B - The finely finishing method of titanium alloy seamless pipe - Google Patents
The finely finishing method of titanium alloy seamless pipe Download PDFInfo
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- CN104324974B CN104324974B CN201410432739.XA CN201410432739A CN104324974B CN 104324974 B CN104324974 B CN 104324974B CN 201410432739 A CN201410432739 A CN 201410432739A CN 104324974 B CN104324974 B CN 104324974B
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- titanium alloy
- seamless pipe
- alloy seamless
- heat treatment
- finishing method
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/30—Finishing tubes, e.g. sizing, burnishing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D3/00—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
- B21D3/02—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts by rollers
- B21D3/04—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts by rollers arranged on axes skew to the path of the work
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/16—Changing 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
- C22F1/18—High-melting or refractory metals or alloys based thereon
- C22F1/183—High-melting or refractory metals or alloys based thereon of titanium or alloys based thereon
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/10—Other heavy metals
Abstract
The present invention relates to the finely finishing method of titanium alloy seamless pipe, belong to titanium alloy seamless pipe technical field.Present invention solves the technical problem that the finely finishing method being to provide titanium alloy seamless pipe.The method includes the following steps being sequentially carried out: a, heat treatment: carry out heat treatment after filling up alumina silicate fibre inside titanium alloy seamless pipe, and heat treatment temperature is 700 DEG C～930 DEG C, and controls the remaining oxygen in heat-treatment furnace below 3%；B, once aligning: titanium alloy seamless pipe is once aligned 500～600 DEG C of temperature, is subsequently cooled to room temperature；C, secondary are aligned: carry out secondary aligning under titanium alloy seamless pipe room temperature, and then pickling obtains titanium alloy seamless pipe.The finely finishing method of titanium alloy seamless pipe of the present invention, it is possible to the flexibility of titanium alloy seamless pipe is adjusted, and remove the oxide layer on titanium alloy seamless pipe surface, simplify technique, reduce titanium consumption, remove the better effects if of titanium pipe surfaces externally and internally oxide layer.
Description
Technical field
The present invention relates to the finely finishing method of titanium alloy seamless pipe, belong to titanium alloy seamless pipe technical field.
Background technology
Owing to the density of titanium is low, intensity is high, corrosion resistance and good, therefore it is widely used in the fields such as oil, chemical industry, Binhai Generator Station and desalinization.In recent years, the titanium seamless tubes needed for these fields requires more and more higher, and the raising of required tubing intensity makes tubing be developed to titanium alloy by pure titanium.Generally, after the rolling of titanium alloy seamless pipe, all require over aligning and make product have the shape met the specification, reduce its flexibility.In addition producing oxide layer at surfaces externally and internally after the hot rolling of titanium alloy seamless pipe or heat treatment, finished product titanium alloy seamless pipe requires to remove this oxide layer.
Removal to titanium alloy seamless pipe surfaces externally and internally oxide layer, the method generally adopting sandblasting+pickling, such as patent 101176882A, or the method adopting emery wheel reconditioning+pickling, such as patent 101905410A.All there is the defect that titanium loss is big in these methods, additionally, the effect that employing sandblasting+acid washing method removes oxide layer is uneven, it will cause the oxide layer of some places to eliminate, and some local no removal, affect the performance of product；The method removal effect of emery wheel reconditioning+pickling is good, but titanium loss is bigger.Visible, there is poor effect, the high deficiency of titanium loss in the technique of existing removal titanium alloy seamless pipe surface oxide layer.
Summary of the invention
Present invention solves the technical problem that the finely finishing method being to provide titanium alloy seamless pipe.
The finely finishing method of titanium alloy seamless pipe of the present invention, the following steps including being sequentially carried out:
A, heat treatment: carry out heat treatment after filling up alumina silicate fibre inside titanium alloy seamless pipe, heat treatment temperature is 700 DEG C～930 DEG C, and controls the remaining oxygen in heat-treatment furnace below 3%；
B, once aligning: titanium alloy seamless pipe is once aligned 500 DEG C～600 DEG C temperature, is subsequently cooled to room temperature；
C, secondary are aligned: carry out secondary aligning under titanium alloy seamless pipe room temperature, and then pickling obtains titanium alloy seamless pipe.
Secondary aligning adopts six-roller straightener, and the center of the three of six-roller straightener upper straightening rolls is adjusted in one in the heart, the center of the three of six-roller straightener lower smoothing rolls is adjusted in another in the heart so that titanium alloy seamless pipe is only flattened without bending by three pairs of smoothing rolls after entering six-roller straightener.
Described pickling is by titanium alloy seamless pipe immersion pickle more than 3 minutes, it is preferred to 3～5 minutes.
Described pickle is made up of following components in percentage by weight: Fluohydric acid. 2.1%～4.9%, nitric acid 12%～26%, and all the other are water.
Compared with prior art, the finely finishing method of titanium alloy seamless pipe of the present invention, can prevent or be greatly decreased the oxidation of titanium alloy seamless pipe inwall during heat treatment, the flexibility of titanium alloy seamless pipe can be adjusted, and remove the oxide layer on titanium alloy seamless pipe surface, simplify technique, reduce titanium consumption, remove the better effects if of titanium pipe surfaces externally and internally oxide layer.
Accompanying drawing explanation
Fig. 1 is the structural representation of the six-roller straightener used in the secondary straightening step in the finely finishing method of titanium alloy seamless pipe of the present invention；
Shown in figure: 1-upper straightening roll；Smoothing roll under 2-；3-titanium pipe.
Detailed description of the invention
The finely finishing method of titanium alloy seamless pipe of the present invention, the following steps including being sequentially carried out:
A, heat treatment: carry out heat treatment after filling up alumina silicate fibre inside titanium alloy seamless pipe, heat treatment temperature is 700 DEG C～930 DEG C, and controls the remaining oxygen in heat-treatment furnace below 3%；
B, once aligning: titanium alloy seamless pipe is once aligned 500 DEG C～600 DEG C temperature, is subsequently cooled to room temperature；
C, secondary are aligned: carry out secondary aligning under titanium alloy seamless pipe room temperature, and then pickling obtains titanium alloy seamless pipe.
Titanium alloy seamless pipe heat-treatment temperature range is 700 DEG C～930 DEG C, before titanium alloy seamless pipe is carried out heat treatment, alumina silicate fibre is filled up inside titanium alloy seamless pipe, in common empty heat-treatment furnace during heat treatment, by regulating the ratio of heat-treatment furnace air and combustion gas, make in stove remaining oxygen lower than 3%, the oxidation of titanium alloy seamless pipe inwall during to prevent or to be greatly decreased heat treatment.Heat treatment utilizes waste heat once to align after coming out of the stove, and so can save operation, reduces cost.
Once aligning 500～600 DEG C of temperature, once align the straightening parameters adjustment by this area routine of other parameters, make titanium alloy seamless pipe flexibility reach finished product requirement, meanwhile, the aligning of 500～600 DEG C can make titanium pipe surfaces externally and internally oxide layer crack；Once the titanium alloy seamless pipe after aligning is cooled to room temperature, carry out secondary cold leveling, because titanium alloy elastic modulus is low, cold rectifying is difficult to aligning, it is make titanium pipe surfaces externally and internally oxide layer especially outer surface oxide layer crack further that titanium pipe after cooling carries out the purpose of secondary aligning, but not aligning, therefore the center of the three of six-roller straightener upper straightening rolls is adjusted in one in the heart, and the center of the three of six-roller straightener lower smoothing rolls is adjusted in one in the heart, titanium alloy seamless pipe is only slightly flattened without bending by three pairs of smoothing rolls after entering six-roller straightener.
By in the titanium alloy seamless pipe immersion pickle after secondary aligning more than 3 minutes, it is preferred to 3～5 minutes.Pickle is made up of following components in percentage by weight: Fluohydric acid. 2.1%～4.9%, nitric acid 12%～26%, and all the other are water.Acid solution enters into the interface between oxide layer and matrix by crackle, makes oxide layer uniformly come off；After pickling, clear water rinses titanium alloy seamless pipe surfaces externally and internally, removes the acid solution of surfaces externally and internally residual.
Concrete, the present invention can adopt following technological process: fill up inside titanium alloy seamless pipe an alumina silicate fibre → heat treatment → time temperature correction → cooling → secondary cold strong → pickling → clear water rinses → checks titanium alloy tube surfaces externally and internally, size, weight.
The finely finishing method of titanium alloy seamless pipe of the present invention, titanium alloy seamless pipe is carried out heat treatment, and heat treatment utilizes waste heat once to align 500 DEG C～600 DEG C temperature after coming out of the stove, make titanium alloy seamless pipe flexibility reach finished product requirement, meanwhile, titanium pipe surfaces externally and internally oxide layer is made to crack；Carry out secondary aligning after being cooled to room temperature so that titanium alloy seamless pipe is slightly flattened without bending, make titanium pipe surfaces externally and internally oxide layer crack further, then carry out pickling again, make oxide layer uniformly come off.By the combination of said method, prevent or be greatly decreased the oxidation of titanium alloy seamless pipe inwall during heat treatment, fully ensure that the flexibility of titanium alloy seamless pipe reaches finished product requirement, and eliminate the oxide layer of seamless pipe, simplify technique, reduce titanium consumption, remove the better effects if of titanium pipe surfaces externally and internally oxide layer.
Below in conjunction with embodiment, the specific embodiment of the present invention is further described, does not therefore limit the present invention among described scope of embodiments.
Embodiment 1
Produce 73*5.51 titanium alloy tube, technological process: fill up inside titanium alloy seamless pipe alumina silicate fibre → annealing heat treatment → mono-time temperature correction → cooling → secondary cold strong → pickling → clear water rinses → checks titanium alloy tube surfaces externally and internally, size, weight.
Wherein, annealing heat treatment temperature is 720 DEG C, and in heat-treatment furnace, remaining oxygen is lower than 3%, and one time temperature correction temperature is 510 ± 10 DEG C, and pickle used by pickling is Fluohydric acid. 2.1%, nitric acid 12%, and all the other are water, and titanium alloy tube soaks 5min in pickle.The flexibility of the titanium alloy tube obtained after finishing is below 2mm/m, and titanium alloy tube surfaces externally and internally is clean, the defect such as flawless, folding, peeling, pin hole, has reached the requirement of finished product titanium alloy tube.The titanium gross weight consumption of heat treatment and finishing is 1.8%.
Produce 89*6.45 titanium alloy tube, technological process: fill up inside titanium alloy seamless pipe alumina silicate fibre → annealing heat treatment → mono-time temperature correction → cooling → secondary cold strong → pickling → clear water rinses → checks titanium alloy tube surfaces externally and internally, size, weight.
Wherein, annealing heat treatment temperature is 760 DEG C, and in heat-treatment furnace, remaining oxygen is lower than 3%, and one time temperature correction temperature is 550 ± 10 DEG C, and pickle used by pickling is Fluohydric acid. 3%, nitric acid 20%, and all the other are water, and titanium alloy tube soaks 5min in pickle.The flexibility of the titanium alloy tube obtained after finishing is below 2mm/m, and titanium alloy tube surfaces externally and internally is clean, the defect such as flawless, folding, peeling, pin hole, has reached the requirement of finished product titanium alloy tube.The titanium gross weight consumption of heat treatment and finishing is 1.7%.
Embodiment 3
Produce 114.3*6.88 titanium alloy tube, technological process: fill up inside titanium alloy seamless pipe alumina silicate fibre → annealing heat treatment → mono-time temperature correction → cooling → secondary cold strong → pickling → clear water rinses → checks titanium alloy tube surfaces externally and internally, size, weight.
Wherein, annealing heat treatment temperature is 785 DEG C, and in heat-treatment furnace, remaining oxygen is lower than 3%, and one time temperature correction temperature is 580 ± 10 DEG C, and pickle used by pickling is Fluohydric acid. 4.9%, nitric acid 26%, and all the other are water, and titanium alloy tube soaks 3min in pickle.The flexibility of the titanium alloy tube obtained after finishing is below 2mm/m, and titanium alloy tube surfaces externally and internally is clean, the defect such as flawless, folding, peeling, pin hole, has reached the requirement of finished product titanium alloy tube.The titanium gross weight consumption of heat treatment and finishing is 1.6%.
Claims (4)
1. the finely finishing method of titanium alloy seamless pipe, it is characterised in that include the following steps being sequentially carried out:
A, heat treatment: carry out heat treatment after filling up alumina silicate fibre inside titanium alloy seamless pipe, heat treatment temperature is 700 DEG C～930 DEG C, and controls the remaining oxygen in heat-treatment furnace below 3%；
B, once aligning: titanium alloy seamless pipe is once aligned 500 DEG C～600 DEG C temperature, is subsequently cooled to room temperature；
C, secondary are aligned: carry out secondary aligning under titanium alloy seamless pipe room temperature, and then pickling obtains titanium alloy seamless pipe；
Secondary aligning adopts six-roller straightener, and the center of the three of six-roller straightener upper straightening rolls is adjusted in one in the heart, the center of the three of six-roller straightener lower smoothing rolls is adjusted in another in the heart so that titanium alloy seamless pipe is only flattened without bending by three pairs of smoothing rolls after entering six-roller straightener.
2. the finely finishing method of titanium alloy seamless pipe according to claim 1, it is characterised in that: described pickling is by titanium alloy seamless pipe immersion pickle more than 3 minutes.
3. the finely finishing method of titanium alloy seamless pipe according to claim 2, it is characterised in that: described pickling is by titanium alloy seamless pipe immersion pickle 3～5 minutes.
4. the finely finishing method of the titanium alloy seamless pipe according to Claims 2 or 3, it is characterised in that: described pickle is made up of following components in percentage by weight: Fluohydric acid. 2.1%～4.9%, nitric acid 12%～26%, and all the other are water.
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| CN201410432739.XA CN104324974B (en) | 2014-08-28 | 2014-08-28 | The finely finishing method of titanium alloy seamless pipe |
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| CN104324974B true CN104324974B (en) | 2016-06-29 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105689450B (en) * | 2016-01-27 | 2017-10-20 | 燕山大学 | A kind of roller continuous straightening device of large straight seam three and process |
| CN109351810A (en) * | 2018-10-26 | 2019-02-19 | 成都先进金属材料产业技术研究院有限公司 | A kind of method for aligning of thin-wall titanium alloy pipe |
| CN113020313A (en) * | 2021-03-02 | 2021-06-25 | 攀钢集团江油长城特殊钢有限公司 | Ledeburite die steel seamless steel tube and preparation method thereof |
| CN115647107B (en) * | 2022-10-25 | 2024-04-02 | 成都先进金属材料产业技术研究院股份有限公司 | Method for improving flattening performance of titanium alloy seamless tube |
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| CN101837386A (en) * | 2009-03-20 | 2010-09-22 | 沈阳德兴钛业有限公司 | Method for manufacturing titanium alloy thick-wall pipe |
| CN102115902A (en) * | 2009-12-30 | 2011-07-06 | 沈阳天贺新材料开发有限公司 | Surface anodization coloring treatment method for titanium and titanium alloy |
| JP2011251334A (en) * | 2010-06-04 | 2011-12-15 | Sumitomo Metal Ind Ltd | Method for suppressing surface indentation flaw in element tube for seamless steel tube |
| CN102962290B (en) * | 2012-11-21 | 2016-06-15 | 浙江新纪元管业科技有限公司 | Improve the production technology of solid drawn tube surface accuracy |
| CN103962410B (en) * | 2013-01-24 | 2016-08-24 | 宝钢特钢有限公司 | A kind of manufacture method of siliceous stainless steel seamless pipe |
| CN103691760A (en) * | 2013-12-17 | 2014-04-02 | 上海奉贤钢管厂 | Preparation process of stainless steel tube |
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