CN107695626A - A kind of construction technology of high-strength seamless steel pipe and products thereof and application - Google Patents
A kind of construction technology of high-strength seamless steel pipe and products thereof and application Download PDFInfo
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- CN107695626A CN107695626A CN201710931932.1A CN201710931932A CN107695626A CN 107695626 A CN107695626 A CN 107695626A CN 201710931932 A CN201710931932 A CN 201710931932A CN 107695626 A CN107695626 A CN 107695626A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
- C21D8/105—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies of ferrous alloys
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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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/07—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing phosphates
- C23C22/08—Orthophosphates
- C23C22/12—Orthophosphates containing zinc cations
- C23C22/13—Orthophosphates containing zinc cations containing also nitrate or nitrite anions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/02—Rigid pipes of metal
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16S—CONSTRUCTIONAL ELEMENTS IN GENERAL; STRUCTURES BUILT-UP FROM SUCH ELEMENTS, IN GENERAL
- F16S3/00—Elongated members, e.g. profiled members; Assemblies thereof; Gratings or grilles
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
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Abstract
The present invention relates to a kind of construction technology of high-strength seamless steel pipe, comprise the following steps：Pipe checks and accepts the roller cold-drawn degreasing normalizing heat treatment acid washing phosphorization three roller precision cold-rolled aligning cutting test package of blanking heating pierced shell tempering acid washing phosphorization saponification cold-drawn annealing heat-treats crop end pickling two；New technology after this improvement employ cold-drawn, two roller cold-drawns, three roller cold-drawns combine mode be processed, cold-drawn extension has been carried out respectively to material.Rolling extension, material multiple directions are carried out with processing to obtain higher intensity, has finally been molded by the way of three roller cold rollings, there is the good characteristics such as tensile strength is high, dimensional discrepancy is small, surface smoothness is high.
Description
Technical field
The present invention relates to a kind of construction technology of seamless steel pipe, more particularly to a kind of construction technology of high-strength seamless steel pipe
And products thereof with application.
Background technology
Seamless steel pipe has hollow section, a large amount of pipelines for being used as trandfer fluid, such as transfer oil, natural gas, coal gas and water
And pipeline of some solid materials etc., compared with solid steel, when and structural strength antitorque in bending resistance is identical, seamless steel pipe quality
It is lighter, it is a kind of economic section steel products；Therefore can be widely used in manufacturing structural member and machine components, such as oil drill rocker, automobile
Steel scaffold in power transmission shaft, bicycle rack and construction etc., the improved method of this alternate form is without influence on knot
Structure intensity, and stock utilization can be improved, simplify manufacturing process, save the excellent effect of material and machining period.
If Authorization Notice No. is a kind of seamless steel pipe disclosed in the Chinese patent of " CN103320711B " and its manufacturer
Method, the manufacture method of the seamless steel pipe disclosed in above-mentioned patent, it is the seamless steel pipe manufactured using hot rolling technology；It is hot rolled
Cheng Zhong, the temperature of rolled piece is high, therefore resistance of deformation is small, it is possible to achieve big deflection.
The tensile strength for the seamless steel pipe being prepared by this hot rolling technology about about exists in 640MPa, elongation percentage
4%；In addition, seamless steel pipe also is prepared using cold-rolling process, the seamless steel pipe that cold-drawing technology is prepared has more preferable
Chemistry, physical property.
We provide the high-strength seamless steel pipe that a kind of tensile strength is more than 7% more than 800MPa and elongation percentage herein.
The content of the invention
It is an object of the invention to provide a kind of construction technology of high-strength seamless steel pipe, the structure that can improve seamless steel pipe is strong
Degree.
The present invention above-mentioned technical purpose technical scheme is that：A kind of high-strength seamless steel pipe
Construction technology, it is characterised in that comprise the following steps：
Step 1：Pipe is checked and accepted；
Step 2：Blanking is simultaneously heated：Stove heat is heated into the blanking of band saw, perforation after the pipe hot piercing of acceptance(check) in step 1,
It is (1230 ± 20) DEG C to control heating-up temperature；
Step 3：Hollow billet is tempered, and it is 100-120min to control hollow billet tempering time, and temperature is (720 ± 20) DEG C；
Step 4：Surface scale is washed away using the dilute sulfuric acid that concentration is 10%；
Step 5：Phosphating coat is produced in the steel tube surface treated by step 4 using phosphating solution, controls the temperature of this phosphating solution
For (65 ± 5) DEG C；
Step 6：Steel tube surface saponification；
Step 7：Cold-drawn；
Step 8：Annealing heat-treats；
Step 9：30mm is each cut off end to end；
Step 10：Dilute sulfuric acid washes away steel tube surface oxide skin；
Step 11：Two roller cold-drawns；
Step 12：Steel tube surface saponification layer is sloughed using degreasing agent；
Step 13：Normalizing is heat-treated；
Step 14：10% dilute sulfuric acid infiltrates, 5-10min；
Step 15：Phosphatization；
Step 16：Three roller precision cold-rolleds；
Step 17：Aligning；
Step 18：By design drawing signal length cutting；
Step 19：Check and accept.
Preferably, phosphating solution includes following component in the step 5, following component is by weight：
Preferably, the step 5, comprises the following steps：
S51：Steel pipe is placed and is immersed in phosphating solution, to phosphating solution rest；
S52：Solution surface spreads nano-graphene powder and sodium sulfate powder uniformly mixed powder, stands 5-10min；
S53：Phosphating solution heat stepwise is to (65 ± 5) DEG C；
S54：Steel pipe is taken out from phosphating solution, dries to surface dripless and drips；
S55：Phosphating solution is cooled to normal temperature.
Preferably, the step 10, comprises the following steps：
S101：The steel pipe for handling to obtain in step 9 is immersed in dilution heat of sulfuric acid, rinse 5-10min；
S102：Clear water, which is cleaned and dried to surface, does not have washmarking；
S103：Sand paper uniform grinding steel tube surface；
S104：It is immersed in again in dilution heat of sulfuric acid, rinse 5-10min；
S105：Above step is repeated, until the steel tube surface being immersed in dilute sulfuric acid has bubble generation.
Preferably, in the step 3, it is 120min to control hollow billet tempering time.
Preferably, the standard in the step 1 according to YB/T5222, GB/T1591 carries out an acceptance inspection, in the step 19,
GB/T3639-2009 is minimum acceptance criteria.
Preferably, in the step 14, normalizing heat treatment environment is oxygen-free environment.
It is an object of the invention to provide a kind of high-strength seamless steel pipe, has more preferable structural strength.
The present invention above-mentioned technical purpose technical scheme is that：Prepared by above-mentioned construction technology
Form.
The present invention above-mentioned technical purpose technical scheme is that：A kind of high-strength seamless steel pipe exists
Application in automobile industry.
In summary, the invention has the advantages that：
(1) original production process route is：Pipe examination-blanking-heating perforation-pickling-phosphatization-the roller of saponification-two cold rolling-rectify
Directly-cutting-inspection-packaging, but in this scheme, production process route is substantially：Pipe examination-blanking-heating perforation-hair
Pipe tempering-pickling-phosphatization-saponification-cold-drawn-annealing heat-treats-crop end-the roller of pickling-two cold-drawn-degreasing-normalizing heat treatment-acid
- the roller of phosphatization-three precision cold-rolled-aligning-cutting-inspection-packaging is washed, so as to complete the construction technology of high-strength seamless steel pipe；This
Kind improvement after new technology employ cold-drawn, two roller cold-drawns, three roller cold-drawns combine mode be processed, material is carried out respectively
Cold-drawn extension.Rolling extension, material multiple directions are carried out with processing to obtain higher intensity, has finally used three roller cold rollings
Mode be molded, there is the good characteristics such as tensile strength is high, dimensional discrepancy is small, surface smoothness is high.
(2) seamless steel pipe is utilized respectively national standard afterwards and carried out an acceptance inspection before construction with construction, so that it is guaranteed that seamless steel pipe
Raw material and prepare complete seamless steel pipe have preferable structural strength.
(3) in step 3, hollow billet tempering is that the workpiece by quenching is reheated to the appropriate temperature less than critical-temperature
Degree, after being incubated a period of time, the metal heating processing technology that is cooled down in the medium such as air or water, oil, it is possible to reduce unbalanced stress
The defects of causing, prevent Widmannstatten structure (W) generation.
(4) carry out phosphorus to steel pipe using phosphating solution in step 5 to wash, phosphating coat can be produced in steel tube surface, in later stage steel pipe
Processing in, certain protective effect can be played to steel tube surface；Saponification process is done in steel tube surface in step 6, after can reducing
The resistance being subject in phase steel pipe process.
(5) phosphating solution is in process for preparation, phosphoric acid and trbasic zinc phosphate as key reaction material, nitric acid as auxiliary substance,
When steel pipe rinse in phosphating solution, phosphoric acid and nitric acid form one layer of phosphate layer being less likely to be damaged in base metal surfaces,
Both the high diaphragm of one layer of attachment degree is formed in metal surface；Phosphoric acid is dissolved in the phenomenon that heat release can be produced in diluent, favorably
In the quick dissolving of remaining material in the solution, its hypophosphorous acid is deposited in diluent in the form of hydrogen ion and phosphate anion
, it is theoretical according to chemical balance, due to the phosphate radical molecular weight and saturation in solution, thus the phosphoric acid of a part, trbasic zinc phosphate with
The presence of the state of compound, after zinc ion, phosphate anion when a part participate in reaction, remaining material is further continued for participating in
Ionization, so as to control the concentration of the pH value of solution and zinc ion；When the zinc ion in solution while consumption, zinc in zinc nitrate from
Son ionization is combined into trbasic zinc phosphate into solution with the phosphate anion to dissociate in solution can continue to participate in reaction, leave unreacted
Phosphoric acid and nitric acid mixture, can put into zinc thereto again, obtain zinc salt, in addition, nitric acid also has passivation to steel pipe
Effect, steel pipe can equally be played a protective role；Adding to defoamer therein can avoid during phosphatization, in solution
Produce minute bubbles and be attached to steel tube surface, film forming agent can help phosphating solution to form uniform diaphragm in steel tube surface；Carbonization
Silicon has higher hardness and structural strength, is that nano level carborundum is added into phosphating solution by size, nature of silicon carbide is steady
It is fixed, react with the acid in phosphating solution, salt etc., nanometer silicon carbide is evenly distributed on the phosphatization film that steel tube surface is formed,
The ability that steel tube surface bears external force can be strengthened.
(6) in step 5, steel pipe is immersed in phosphating solution, splashed on phosphating solution surface graphene and sodium sulphate it is mixed
Powder is closed, sodium sulphate can be used as a kind of defoamer, be soluble in the solution, therefore graphene rests on solution surface, when by steel
When pipe lifts from phosphating solution, graphene powder rests on steel tube surface, has preferable intensity and toughness, further to steel
Pipe plays a protective role；Secondly graphene be layer structure, can also increase the lubricity of steel tube surface, reduce steel pipe process by
Resistance.
Brief description of the drawings
Fig. 1 is overall flow schematic diagram in embodiment 6；
Fig. 2 is step 5 schematic flow sheet in embodiment 6；
Fig. 3 is step 10 schematic flow sheet in embodiment 6.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
This specific embodiment is only explanation of the invention, and it is not limitation of the present invention, people in the art
Member can make the modification of no creative contribution to the present embodiment as needed after this specification is read, but as long as at this
All protected in the right of invention by Patent Law.
Embodiment 1- embodiments 5 are as shown in the table：
Table 1：
Clean container is taken, adds diluent thereto, diluent selects deionized water, then adds phosphoric acid, trbasic zinc phosphate, nitric acid to it
Uniform stirring after zinc, nanometer silicon carbide, until its whole is dispersed in diluent；Accelerator, film forming agent, oxygen are measured afterwards
Agent and defoamer add into mixed solution and uniform stirring.
Embodiment 6：
A kind of construction technology of high intensity seamless construction steel pipe, as shown in figure 1, comprising the following steps：
Step 1：Pipe is checked and accepted, and is carried out an acceptance inspection according to YB/T5222, GB/T1591 standard；
Step 2：Blanking is simultaneously heated：Stove heat is heated into the blanking of band saw, perforation after the pipe hot piercing of acceptance(check) in step 1,
It is (1230 ± 20) DEG C to control heating-up temperature；
Step 3：Hollow billet is tempered, and it is 100-120min to control hollow billet tempering time, and temperature is (720 ± 20) DEG C, in the present embodiment
It is 120min to control hollow billet tempering time；
Step 4：Surface scale is washed away using the dilute sulfuric acid that concentration is 10%；
Step 5：Phosphatization, as shown in Figure 2；
S51：The phosphating solution being prepared in embodiment 4 is placed in clean container, then obtained steel pipe will be removed in step 4
It is placed in phosphating solution and is dipped to phosphating solution rest, started the clock after phosphating solution rest, soaks 2-3min
, 2min is soaked in the present embodiment；
S52：By nano-graphene powder and sodium sulfate powder with 1:After 3 ratio uniform mixing, mixed-powder is sprinkling upon phosphatization
Liquid surface, 0.13% part that number is about phosphating solution total number is sprinkled into every time, stand 5-10min, 6min is stood in the present embodiment；
S53：Phosphating solution is heated, and phosphating solution is entered by the way of the pond to being contained with phosphating solution is integrally heated in the present embodiment
Row Segmented heating, i.e. heating make phosphating solution temperature rise 5-7 DEG C, and quiet put makes 1-2 DEG C of phosphating solution temperature decline, so repeatedly more
The secondary temperature for making phosphating solution reaches (65 ± 5) DEG C, after phosphating solution temperature reaches, places about 1min；
S54：Steel pipe is taken out from phosphating solution, and dries to surface dripless drip at normal temperatures；
S55：Phosphating solution is cooled to normal temperature；
Phosphating coat is produced in the steel tube surface treated by step 4 using the phosphating solution being prepared in embodiment 4, controls this
The temperature of phosphating solution is (65 ± 5) DEG C；
As shown in Figure 1.
Step 6：Steel tube surface saponification, saponification can use suds or ethyl acetate；
Step 7：Cold-drawn；
Step 8：Annealing heat-treats；
Step 9：30mm is each cut off end to end；
Step 10：Dilute sulfuric acid washes away steel tube surface oxide skin, as shown in Figure 3；
S101：The steel pipe for handling to obtain in step 9 is immersed in dilution heat of sulfuric acid, rinse 5-10min, rinse in the present embodiment
6.5min；
S102：Steel pipe, which is dried to surface, does not have drop to leave, without washmarking yet；
S103:Uniform grinding is carried out to steel tube surface using sand paper, sand paper can use 100 mesh, 800 mesh or 1200 mesh；
S104:The steel pipe that polishing finishes is immersed in dilution heat of sulfuric acid again, rinse 5-10min,
S105：Above step is repeated, until the steel tube surface being immersed in dilute sulfuric acid has bubble generation.
As shown in Figure 1.
Step 11：Two roller cold-drawns；
Step 12：Steel tube surface saponification layer is sloughed using degreasing agent；
Step 13：Normalizing is heat-treated, and it is oxygen-free environment to control the surrounding environment in this step；
Step 14：10% dilute sulfuric acid infiltrates, 5-10min；
Step 15：Phosphatization；
Step 16：Three roller precision cold-rolleds；
Step 17：Aligning；
Step 18：By design drawing signal length cutting；
Step 19：Check and accept, using GB/T3639-2009 as minimum acceptance criteria, remaining is checked and accepted is defined by design drawing requirement.
Embodiment 7：
The phosphating solution being prepared in embodiment 1- embodiments 5 is applied into embodiment 6, and to the obtained high intensity of processing without
Seam steel pipe does performance detection, and is recorded in table 2；
Table 2：
* the seamless steel pipe in comparative example is to be handled obtained seamless steel pipe by prior art.
But conclusion can be obtained according to upper table：Operation, which is carried out, by the construction method recorded in this programme processes obtained nothing
Stitch steel pipe compared with prior art, have in performance and significantly improve.
Claims (9)
1. a kind of construction technology of high-strength seamless steel pipe, it is characterised in that comprise the following steps：
Step 1：Pipe is checked and accepted；
Step 2：Blanking is simultaneously heated：Stove heat is heated into the blanking of band saw, perforation after the pipe hot piercing of acceptance(check) in step 1,
The heating-up temperature is controlled to be（1230±20）℃；
Step 3：Hollow billet is tempered, and it is 100-120min to control hollow billet tempering time, and temperature is（720±20）℃；
Step 4：Surface scale is washed away using the dilute sulfuric acid that concentration is 10%；
Step 5：Phosphating coat is produced in the steel tube surface treated by step 4 using phosphating solution, controls the temperature of this phosphating solution
For（65±5）℃；
Step 6：Steel tube surface saponification；
Step 7：Cold-drawn；
Step 8：Annealing heat-treats；
Step 9：30mm is each cut off end to end；
Step 10：Dilute sulfuric acid washes away steel tube surface oxide skin；
Step 11：Two roller cold-drawns；
Step 12：Steel tube surface saponification layer is sloughed using degreasing agent；
Step 13：Normalizing is heat-treated；
Step 14：10% dilute sulfuric acid infiltrates, 5-10min；
Step 15：Phosphatization；
Step 16：Three roller precision cold-rolleds；
Step 17：Aligning；
Step 18：By design drawing signal length cutting；
Step 19：Check and accept.
A kind of 2. construction technology of high-strength seamless steel pipe according to claim 1, it is characterised in that：In the step 5
Phosphating solution includes following component, and following component is by weight：
Phosphatase 11 0-12 parts
Trbasic zinc phosphate 6-8 parts
Zinc nitrate 4-6 parts
Nanometer silicon carbide 2-3 parts
Accelerator 1.2-1.8 parts
Film forming agent 1.2-1.5 parts
Defoamer 1.1-1.3 parts
Oxidant 0.8-1.5 parts
Diluent 0-10 parts.
A kind of 3. construction technology of high-strength seamless steel pipe according to claim 2, it is characterised in that：The step 5, bag
Include following steps：
S51：Steel pipe is placed and is immersed in phosphating solution, to phosphating solution rest；
S52：Solution surface spreads nano-graphene powder and sodium sulfate powder uniformly mixed powder, stands 5-10min；
S53：Phosphating solution heat stepwise is extremely（65±5）℃；
S54：Steel pipe is taken out from phosphating solution, dries to surface dripless and drips；
S55：Phosphating solution is cooled to normal temperature.
A kind of 4. construction technology of high-strength seamless steel pipe according to claim 3, it is characterised in that：The step 10,
Comprise the following steps：
S101：The steel pipe for handling to obtain in step 9 is immersed in dilution heat of sulfuric acid, rinse 5-10min；
S102：Clear water, which is cleaned and dried to surface, does not have washmarking；
S103：Sand paper uniform grinding steel tube surface；
S104：It is immersed in again in dilution heat of sulfuric acid, rinse 5-10min；
S105：Above step is repeated, until the steel tube surface being immersed in dilute sulfuric acid has bubble generation.
A kind of 5. construction technology of high-strength seamless steel pipe according to claim 1, it is characterised in that：In the step 3,
It is 120min to control hollow billet tempering time.
A kind of 6. construction technology of high-strength seamless steel pipe according to claim 1, it is characterised in that：In the step 1
Carried out an acceptance inspection according to YB/T5222, GB/T1591 standard, in the step 19, GB/T3639-2009 is minimum acceptance criteria.
A kind of 7. construction technology of high-strength seamless steel pipe according to claim 1, it is characterised in that：The step 14
In, normalizing heat treatment environment is oxygen-free environment.
A kind of 8. high-strength seamless steel pipe, it is characterised in that：As the construction described in any one claim in claim 1-7
Technique is prepared.
A kind of 9. application of the high-strength seamless steel pipe being prepared in claim 8 in automobile industry.
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Cited By (5)
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| CN109402357A (en) * | 2018-12-28 | 2019-03-01 | 江苏建中新材料科技有限公司 | A kind of high-intensitive, high-precision Q345E steel pipe process |
| CN109604369A (en) * | 2018-09-14 | 2019-04-12 | 山东庆云三友机械电器有限公司 | Precision seamless steel tubes production technology |
| CN110423997A (en) * | 2019-08-16 | 2019-11-08 | 湖南工学院 | A kind of parkerizing method of the phosphating solution and magnesium or magnesium alloy of dopen Nano silicon-carbide particle or hydroapatite particles |
| CN115401411A (en) * | 2022-08-20 | 2022-11-29 | 常州振瑞机械制造有限公司 | Production process of stainless steel welded steel pipe |
| CN115926748A (en) * | 2022-12-21 | 2023-04-07 | 广东红日星实业有限公司 | Grinding fluid and preparation method and application thereof |
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