CN103691760A - Preparation process of stainless steel tube - Google Patents
Preparation process of stainless steel tube Download PDFInfo
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Abstract
The invention provides a preparation process of a stainless steel tube. The preparation process is characterized by comprising the following steps: continuously polishing the outer surface of the steel tube; cold-rolling the polished steel tube by LG and LD rolling mills; performing degreasing on the cold-rolled steel tube; cleaning the inner wall of the degreased steel tube by stray bullets; drying the steel tube with the inner wall cleaned by the stray bullets by drying equipment; carrying out non-oxidizing thermal treatment on the dried steel tube; straightening the steel tube after non-oxidizing thermal treatment for changing the straightness of the steel tube; carrying out fixed-length cutting on the straightened steel tube; carrying out surface treatment on the steel tube after fixed-length cutting; cleaning the inner wall of the steel tube after surface treatment by the stray bullets; and then detecting flaws and printing codes. According to the invention, a conventional process is improved by multiple steps so as to ensure that the steel tube produced by the preparation process has the characteristics of high precision, high degree of finish and high corrosion resistance.
Description
Technical field
The present invention relates to a kind of preparation technology of stainless steel tube, be specifically related to the preparation technology of the accurate gapless stainless steel tube of the corrosion-resistant austenite of a kind of best bright finish.
Background technology
In domestic market, accurate gapless stainless steel tube is generally divided into two kinds, the general dedicated pipe by pipe and top grade of low and middle-grade times.
Low and middle-grade its preparation technology's tradition of accurate gapless stainless steel tube, its main improvement direction is to meet domestic quality standard as far as possible.High-grade accurate gapless stainless steel tube, has higher requirement to the performance of tubing, and according to the difference of service condition, specific performance need can meet the requirement of international standard.Therefore in preparation technology, must constantly bring forth new ideas, constantly progressive, could adapt to the international standard improving constantly.
Yet the preparation technology of stainless steel tube is an integral body of a plurality of set of steps, only some processes are improved, its effect is limited, and its result after processing of the semi-finished product after each step is to have corresponding standard, how in can both the do better main target of the preparation process amelioration that is stainless steel tube of each link.
In traditional handicraft, inadequate to the attention degree of polishing, do not recognize the important parts of pipe to end product quality; Aspect cold rolling, tradition plug exists flexural deformation large after due to heat treatment, qualification rate is low, the problem that hardness fluctuations scope is large, if obtain high rigidity, require again heat treatment flexural deformation little, must adopt the cooling means relaxing, as heating bath grade quench, dry quenching etc., but hardness does not reach again HRC60～62 requirement.In traditional handicraft, (what pickling adopted is that the hydrofluoric acid of the useless cylinder of pickling adds salpeter solution, mainly by corrosion, peel off the object that reaches degreasing, this not only can make steel tube surface degreasing not to the utmost, and can cause the corrosion phenomenon of steel tube surface, reduces thus the corrosion resistance of steel pipe, this is a kind of extremely irrational mode, and there is overpickling, and owe the shortcomings such as pickling, each pond of acid cleaning process needs special messenger to keep an eye on its process time.)
The clean traditional handicraft of inside pipe wall is only simply rinsed by giant, and its cleaning effect is very poor, also very waste water resource, simultaneously inefficiency.
Traditional stoving process adopts high-power air-heater to dry, and it is heated inhomogeneous, poor processing effect, and shipment difficulty, efficiency is very low, and power consumption is high; Current domestic stainless steel tube heat treatment; generally adopt the box or continuous annealing furnace that has protective atmosphere control system, still, because continuous annealing furnace exists gap when material passes in and out furnace chamber; how to prevent that outside air from entering in stove, become the key problem in technology that determines the rear steel tube surface quality of annealing.
Aspect Passivation Treatment, the passivating film that traditional handicraft forms, can not meet effect that metal is separated completely with corrosive medium completely, prevent that metal from directly contacting with corrosive medium, thereby make metal substantially stop the effect of dissolving.
Summary of the invention
The object of the invention is to, a kind of preparation technology of stainless steel tube is provided, to overcome the existing above-mentioned shortcoming and defect of prior art.
The improvement of a plurality of step of the present invention to traditional handicraft, carries out great many of experiments, by series of experiments result, preparation technology is improved, and is intended in each link, to draw close even surmount international standard as far as possible.
A preparation technology for stainless steel tube, is characterized in that, comprises the following steps:
(1) adopt diamond dust sized flap wheel and six groups of ramming head polishing machines to process the outer surface continuous polishing of steel pipe;
(2) steel pipe after polishing is carried out to cold-rolling treatment by LG, LD type milling train;
(3) steel pipe after cold rolling is carried out to surface treatment, comprise;
(4) it is clean that the steel pipe after effects on surface processing carries out fly bomb inwall, utilize air jet system to launch a sponge fly bomb that is greater than pipeline internal diameter certain standard in steel pipe, fly bomb is fully rubbed along steel tube inner hole high-speed motion and with steel pipe inner wall, reach the object of clean inwall;
(5) steel pipe after clean to fly bomb inwall carries out drying and processing by drying plant;
(6) steel pipe after drying and processing is carried out to non-oxidation heat treatment process;
(7) steel pipe after non-oxidation heat treatment process is carried out to Passivation Treatment, steel pipe is placed in to chemical passivation solution and soaks, circulation stirring 40-50min then soaks 15-30min in normal temperature clear water, and after taking out, water is rinsed well;
(8) steel pipe after Passivation Treatment is aligned, changed the linearity of steel pipe;
(9) to the steel pipe after aligning cut, transport, flaw detection and stamp.
Further, step (1) outer surface polishing, adopts 200 ± 40 order diamond dust sized flap wheels, six groups of ramming head polishing machines to throw twice continuously, carries out outer peeling processing.
Further, the polishing in step (1) is except carrying out polishing to the outer surface of steel pipe, and the mode that also adopts 80 order honing oil stones to process is back and forth carried out polishing to the inner surface of steel pipe.
Further, the steel pipe sizes precision that LG, LD type milling train carry out cold-rolling treatment in step (2) is ± 0.05mm, and surface roughness is Ra≤0.3 μ m; Plug material is for containing Si tool steel or high Cr tool steel, and average life span has improved 2～3 times than traditional GCr15 steel core bar; Pass deformation is 70%～85%.
Further, the wash number in step (3) is 2, and the solvent of employing is diesel oil, and pickling time is 7-8 hour for the first time, and pickling time is more than 4 hours for the second time; What drain employing is to be greater than the tilting rack of 30 ℃.
The number of times of the cleaning in step (3) is 2, and the solvent that cleaning by degreasing adopts is diesel oil), pickling time is 7-8 hour for the first time, pickling time is more than 4 hours for the second time; What drain employing is to be greater than the tilting rack of 30 ℃.
Further, the diameter of the fly bomb that the middle fly bomb inwall of step (4) is clean is greater than the 10%-20% of diameter of steel tube, and what material adopted is high-density sponge, is shaped as cylindrical structure.
Further, the drying plant in step (5) has been removed traditional air supply duct, is provided with sandwich construction in heating cabinet, and heating-up temperature is 180 ° ± 50 °, and the power of drying plant is 30KW.
Further, in step (6), adopt in the non-oxidation continuous annealing furnace with protective gas and carry out non-oxidation heat treatment process, by increase heat shield and the high-temperature furnace mouth flame device for regulating direction that alumina silicate fibre blanket is made at continuous annealing furnace two ends, the inside and outside circulation of gas of heating furnace and entering of extraneous air have effectively been prevented; What heating cabinet adopted is plate armature; Be controlled at ± 10 degree of the temperature difference in heating process.
Further, the formula of the chemical passivation solution in step (7) is: nitric acid 22-27wt%, and chromic anhydride 1.5-2.2wt%, molybdic acid 4.5-6.5wt%, benzimidazole 6-9wt%, surplus is water.
Beneficial effect of the present invention:
One, adopt the dual glossing of surfaces externally and internally, the oxide on the inside and outside two sides of removal steel pipe, impurity, straight way etc., improved grade of finish and the decay resistance after steel pipe rolling greatly.
Two, cold rolling plug selected quenching degree better, in heating bath classification, relax Si tool steel or the high Cr tool steel that can obtain high rigidity when cooling and manufacture, average life span has improved 2～3 times than GCr15 steel core bar.
What three, acid cleaning process adopted is that diesel oil cleans, and except removing attachment, can also remove lubricating oil, does not have overpickling simultaneously, owes the shortcomings such as pickling.Do not need extensive work personnel to look after.Cleaning by degreasing adopts organic solvent to carry out degreasing, can steel pipe not produced and be damaged, also very not heavy smell.
Four, clean what adopt is fly bomb treatment process to inwall, compares with conventional art, and better effects if, implements simplyr, and still less, fly bomb can recycle the manpower of cost, and implementation cost is lower.
Five, by design multilayer storehouse frame in the heating cabinet of drying plant, on the one hand, steel pipe is laid on the storehouse frame of different layers, makes to be heated more even, the power requirement of heater is also declined than conventional art, more energy-conservation; On the other hand, more even owing to being heated, therefore also needn't worry the problem of excess Temperature, make the design of cancelling air supply duct become possibility, further make the power of heater be declined.
Six, in heat treatment process, by increase heat shield and the high-temperature furnace mouth flame device for regulating direction that alumina silicate fibre blanket is made at continuous annealing furnace two ends, the inside and outside circulation of gas of heating furnace and entering of extraneous air have effectively been prevented, greatly improve the surface smoothness of steel pipe, strengthened the corrosion resistance of steel pipe.
What seven, passivating solution adopted is the formula of original creation, and its diaphragm can effectively prevent the effect that metal and corrosive medium separate completely, prevents that metal from directly contacting with corrosive medium, thereby makes metal substantially stop dissolving.
Accompanying drawing explanation
Fig. 1 is process chart of the present invention.
Reference numeral:
Step 1 polishing, step 2 cold-rolling treatment, step 3 surface treatment, step 4 fly bomb inwall are clean, step 5 drying and processing, step 6 non-oxidation heat treatment process, step 7 Passivation Treatment, step 8 aligning and step 9 cutting, transportation, flaw detection and stamp.
The specific embodiment
Below in conjunction with specific embodiment, the present invention is done to progressive explanation.Should be understood that following examples are only for the present invention is described but not for limiting scope of the present invention.
Embodiment 1
Fig. 1 is process chart of the present invention, as shown in Figure 1, the present invention includes following steps:
Step 1: the present invention adopts 200 ± 40 order diamond dust sized flap wheels, six groups of ramming head polishing machines to throw twice continuously, carries out outer peeling processing.Comparing the present invention with traditional technology improves the quality and quantity of polishing process, in the present embodiment, adopt 200 order diamond dust sized flap wheels, six groups of ramming head polishing machines to throw twice continuously, according to the actual conditions of steel pipe and client's needs, selected the mode that adopts 80 order honing oil stones to process back and forth to carry out polishing to the inner surface of steel pipe simultaneously.The blemish such as the object of doing is like this straight way, pit in order to exist pipe, scab, folding, hair check solve thoroughly.The defect that most of quality of tube blank steel all exist, can be processed thoroughly in the very first time if do not had, and then these defects more can spread deterioration in rear step operation, cannot remove at all, become the source of causing fished pipe surface corrosion.Experiment shows, in the situation that downstream production technology is identical, straight way, the pit that pipe is existed, scab, the blemish such as folding, hair check, employing is disregarded with different glossings and is processed, the surface and the steel pipe corrosion resistance that have compared finished product, confirmed the effect of existing glossing, and conclusion is: produce the accurate gapless stainless steel tube of the corrosion-resistant austenite of best bright finish, the polishing of pipe must be thoroughly, and technique must standard.Therefore the present invention has overturned and has thought in traditional stainless steel tube preparation technology: fished pipe is to be determined by post processing, but not the quality of pipe.Really, we have no idea the pipe of buying to carefully choose, and from cost efficiency, consider it is unpractical, but we can just repair pipe in first glossing, thereby address this problem.
Step 2: the steel pipe after polishing is carried out to cold-rolling treatment by LG, LD type milling train.
Cold pilger mill is generally all divided into two kinds, and a kind of is LG type, and a kind of is exactly LD type.The cold pilger mill of LG type is two-roller mill.LD type is multi-roll mill (more than at least three rolls, comprising three).
The primary structure of LG type cold pilger mill is: lathe bed, revolution feed mechanism, frame, main motor, plug, transmission system, electrical system etc.Cold pilger mill is in the past all that single revolution is singly sent to, develops into now single revolution, twoly sends to, double back turns, and singly sends to.Double back turns two to be sent to etc., and the mode of generally sending to can be divided into again machinery to be sent to, and photoelectricity is sent to, servo send to etc.A topmost part of cold-rolling mill is exactly frame, and frame comprises: roll, gear, tooth bar etc.Its operation principle: roll and plug form well-regulated cavity, utilizes the strain of metal to realize the rolling of steel pipe.
By the structure in conjunction with two rollers and multi-high cold-rolling pipe mill, traditional LG, LD type milling train are improved, realizing multiple roll industry control controls, guaranteed cold rolling precision, make steel pipe sizes precision be ± 0.05mm, surface roughness is Ra≤0.3 μ m, far above the national standard of precision≤± 0.10mm, surface roughness≤Ra0.8 μ m.
The cold rolling plug of rolling high precision cold tube rolling is the key industry mould of cold rolled precision steel pipe, and its quality directly has influence on the precision of cold tube rolling and the fineness of inner surface.Plug material is for containing Si tool steel or high Cr tool steel, and average life span has improved 2～3 times than traditional GCr15 steel core bar; Pass deformation is 70%～85%.Traditional GCr15 steel core bar exists flexural deformation large after due to heat treatment, qualification rate is low, and the problem that hardness fluctuations scope is large requires again heat treatment flexural deformation little if will obtain high rigidity, must adopt the cooling means relaxing, as heating bath grade quench, dry quenching etc.But hardness does not reach again HRC60～62 requirement.What in the present embodiment, adopt is 9CrSi tool steel, and also can select is Cr12MoV tool steel, selects the reason of these type tool steel to be, its quenching degree is better, in heating bath classification, relax when cooling and can obtain high rigidity.
Step 3: the steel pipe after cold rolling is carried out to surface treatment, comprise pickling, drain, white picking, clear water are cleaned, drain, cleaning by degreasing, clear water are cleaned and drain.
First be that steel pipe is carried out to pickling processes, stainless steel is immersed in the first diesel pool, submergence 7-8 hour, decomposes paraffin oil completely completely.2-3 natural flushing put down in lifting, after be placed on to be greater than on 30 ℃ of tilting racks and drain diesel oil.
Then carry out white picking, steel pipe is immersed in clean diesel pool again, submergence more than 4 hours, is then rinsed surfaces externally and internally with High Pressure Gun by root completely.By feel, feel and determine that endoporus is without paraffin oil, sand grains, iron end, endoporus observation is without butter, long-pending thing, and lifting drains.
Finally carry out cleaning by degreasing, the good steel pipe of diesel oil pickling is put into the cleaning by degreasing pond of heating mobile, submergence more than 4 hours, is cleaned surfaces externally and internally with High Pressure Gun by root after lifting completely.By feel, feel inside and outside and sink deposit without oil, sand grains, iron end, the bright nothing of endoporus, be placed on to be greater than on 30 ℃ of tilting racks and drain.
Traditional cleaning by degreasing is used is that the hydrofluoric acid of the useless cylinder of pickling adds salpeter solution, mainly by corrosion, peel off the object that reaches degreasing, this not only can make steel tube surface degreasing not to the utmost, and can cause the corrosion phenomenon of steel tube surface, reduce thus the corrosion resistance of steel pipe, this is a kind of extremely irrational mode.
Compare with traditional pickling mode, the present invention adopts diesel oil pickling, can effectively remove and in cold-rolled process, stick to lubricating oil and the impurity on steel pipe.Diesel oil pickling simultaneously can not cause overpickling and owe the problem of pickling, can largely reduce human cost.
Compare with traditional cleaning by degreasing, what the present invention adopted is that organic solvent carries out degreasing, by organic solvent to the dissolution of greasy dirt to reach the object of degreasing, and to the not infringement of the surface of stainless steel tube.
Step 4: it is clean that the steel pipe after effects on surface is processed carries out fly bomb inwall, traditional inwall is clean is to adopt giant to rinse in managing, weak effect, waste water resource not only, and lose time.The fly bomb inwall that the present invention adopts is clean, utilizes air jet system to launch a sponge fly bomb that is greater than pipeline internal diameter certain standard in steel pipe, and fly bomb is fully rubbed along steel tube inner hole high-speed motion and with steel pipe inner wall, reaches the object of clean inwall.Wherein the diameter of the clean fly bomb of fly bomb inwall is greater than the 10%-20% of diameter of steel tube, and object is for upon deployment, can fully contact friction with inwall, avoids situation about blocking because diameter is oversize simultaneously.What material adopted is high-density sponge, can recycle, and elasticity is sufficient simultaneously, and cleaning effect is good, considers the character of steel pipe simultaneously, and the shape of sponge fly bomb is designed to cylindrical structure.
Step 5: the steel pipe after clean to fly bomb inwall undertaken oven dry place by the drying plant of 30KW power.Tradition drying plant has air supply duct, the effect of air supply duct is as a buffer area, can allow the temperature in heating cabinet obtain stable control, what the storehouse frame in the heating cabinet of simultaneously traditional drying plant adopted is arc stent, and steel pipe is to be also bundled into cylinder, this design has some defects: on the one hand, traditional oven dry is to be placed on equally afterwards on the frame of storehouse by being similar to cylinder after steel pipe is tied up, the poor effect of drying like this, the drying effect of steel pipe cannot be heated evenly, because the height of every steel pipe differs, make being heated of every steel pipe all different, in order to raise the efficiency, can not to scruple all steel pipes completely and whether all complete drying effect, in order to improve quality, need the time that cost energy is many and become the original effect of drying that improves, wasting energy very, on the other hand, the size of steel pipe, material are indefinite, if traditional storehouse frame runs into the large steel pipe of density of some materials, for safety, just must reduce the amount of putting into, prevent that storehouse frame from damaging because of weight, and the cost of first drying is fixed, the steel pipe of therefore same quantity, need to spend more number of times and dry, cause the waste of cost, the loss of the energy.
Compare with traditional drying plant, the present invention has removed traditional air supply duct, and hot-air can be directly delivered in heating cabinet, but is thereupon the uncontrollable problem of temperature, so the present invention is provided with sandwich construction in heating cabinet.Therefore because heating cabinet is rectangular configuration, than round-shaped, can more make full use of resource steel tube stacking is in a rectangular shape.On the other hand, hierarchy makes the weight branch of steel pipe also more balanced, traditional cylinder mode of tying up makes the weight of all steel pipes all need storehouse frame to bear, and storehouse of the present invention frame makes the average branch of the quantity of steel pipe on every aspect, pressure relieve is a lot, can not produce the problem of traditional storehouse frame, so the steel pipe quantity of first drying is also more than traditional drying plant, also still less, cost is also lower for the energy of the traditional drying plant comparing.Guarantee temperature be 180 ° ± 50 ° in power also from original 180KW, be reduced to 30KW.
Step 6: the steel pipe after drying and processing is carried out to non-oxidation heat treatment process.Traditional stainless steel tube heat treatment technics, generally adopts the box or continuous annealing furnace that has protective atmosphere control system.But, because continuous annealing furnace exists gap when material passes in and out furnace chamber, how to prevent that outside air from entering in stove, become the key problem in technology that determines the rear steel tube surface quality of annealing.Because steel tube surface is as produced iron scale after heat treatment, palpus pickling processes, and directly have influence on the inside and outside fineness of steel pipe and decay resistance.The present invention, by increase heat shield and the high-temperature furnace mouth flame device for regulating direction that alumina silicate fibre blanket is made at continuous annealing furnace two ends, has effectively prevented the inside and outside circulation of gas of heating furnace and entering of extraneous air, has guaranteed that Austenitic stainless steel pipe is at high purity N
2under protection, carry out bright annealing processing, greatly improved the surface smoothness of steel pipe, strengthened the corrosion resistance of steel pipe.
Aspect transportation, compare with traditional bridge-type means of transportation, what heating cabinet of the present invention adopted is flat design simultaneously, therefore does not need to adopt bridge-type means of transportation to raise and rises and decline, and relative has just saved a lot of time.
What be on the other hand that air-heater of the present invention adopts is automatic temperature controlling technology, utilizing temperature to survey instrument is connected with industrial computer, the value arranging in temperature data and database is compared, can be along with controlling the variation of temperature, heating-up temperature of the present invention is compared with a traditional ± 50 ° residual quantity, the present invention can accomplish ± residual quantity of 10 °, and energy-saving effect is better.
Step 7: the steel pipe after non-oxidation heat treatment process is carried out to Passivation Treatment, and the chemical passivation solution that steel pipe is placed in to 20-25 ℃ soaks, and circulation stirring 40-50min then soaks 15-30min in normal temperature clear water, after taking out, water is rinsed well.The formula of chemical passivation solution is: nitric acid 22-27wt%, and chromic anhydride 1.5-2.2wt%, molybdic acid 4.5-6.5wt%, benzimidazole 6-9wt%, surplus is water.
Austenitic stainless steel pipe Passivation Treatment effect quality depends on three large technological parameters: passivating solution composition, passivating solution temperature and Passivation Treatment time.In traditional handicraft, solution composition nitric acid 300～500g/L and sodium dichromate 20～30g/L, process under room temperature 30～60 minutes.For avoiding stainless steel surfaces to have residual passivating solution to cause later corrosion, also should be in the sodium carbonate liquor of 30～50g/L after passivation under room temperature neutralisation treatment 1 minute.The present invention, on traditional handicraft basis, improves solution temperature: 20～25 ℃ according to research and development experiment and practical test; Processing time: soak 40～50 ∕ min; Operation requirements: put into chemical passivation groove after the remaining liquid of seamless steel pipe surface noresidue, and make tube wall fully contact passivating solution by circulation stirring, guarantee that passivation is even, according to solution temperature height, suitably regulate the processing time.Soak rear-inclined steel pipe, naturally hang down and drip.Steel pipe through passivation a remainder liquid moves into Rinsing Area, more than soaking 15min, by giant, by root, rinses in normal temperature clear water, thoroughly removes the residual passivating solution of steel tube surface.
Step 8: the steel pipe after Passivation Treatment is aligned, changed the linearity of steel pipe.The parts that equipment for straightening contacts with steel pipe adopt nylon plastic(s) manufacture, and it is shaped as cucurbit mouth, adopt nylon plastic(s) to be because his hardness lower than steel pipe hardness, can prevent that the corrosion resistance that friction causes from declining, adopt cucurbit mouth-shaped compared with traditional crawler belt design, can greatly reduce the cost of the manufacturing equipment of transporting equipment.
Step 9: to the steel pipe after aligning cut, transport, flaw detection and stamp.Flaw detection stamp adopts integration apparatus, and flaw detection adopts two infrared detection equipment, from the infrared heat reservoir of upper and lower two position capture outer wall of steel pipe and inwall, has guaranteed the detection quality of steel pipe, testing result is transferred to numbering device simultaneously and carries out stamp.
Above the specific embodiment of the present invention is illustrated, but the present invention is as limit, only otherwise depart from aim of the present invention, the present invention can also have various variations.
Claims (9)
1. a preparation technology for stainless steel tube, is characterized in that, comprises the following steps:
(1) adopt diamond dust sized flap wheel and six groups of ramming head polishing machines to process the outer surface continuous polishing of steel pipe;
(2) steel pipe after polishing is carried out to cold-rolling treatment by LG, LD type milling train;
(3) steel pipe after cold rolling is carried out to surface treatment, comprise that cleaning by degreasing, clear water clean and drain;
(4) it is clean that the steel pipe after effects on surface processing carries out fly bomb inwall, utilize air jet system to launch a sponge fly bomb that is greater than pipeline internal diameter certain standard in steel pipe, fly bomb is fully rubbed along steel tube inner hole high-speed motion and with steel pipe inner wall, reach the object of clean inwall;
(5) steel pipe after clean to fly bomb inwall carries out drying and processing by drying plant;
(6) steel pipe after drying and processing is carried out to non-oxidation heat treatment process;
(7) steel pipe after non-oxidation heat treatment process is carried out to Passivation Treatment, the chemical passivation solution that steel pipe is placed in soaks, and then circulation stirring 40-50min soaks 15-30min in normal temperature clear water, and after taking out, water is rinsed well;
(8) steel pipe after Passivation Treatment is aligned, changed the linearity of steel pipe;
(9) to the steel pipe after aligning cut, transport, flaw detection and stamp.
2. the preparation technology of a kind of stainless steel tube according to claim 1, is characterized in that: step (1) outer surface polishing, employing 200 ± 40 order diamond dust sized flap wheels, six groups of ramming head polishing machines throw twice continuously, carry out outer peeling processing.
3. the preparation technology of a kind of stainless steel tube according to claim 1, it is characterized in that: the polishing in step (1) is except carrying out polishing to the outer surface of steel pipe, and the mode that also adopts 80 order honing oil stones to process is back and forth carried out polishing to the inner surface of steel pipe.
4. the preparation technology of a kind of stainless steel tube according to claim 1, is characterized in that: the steel pipe sizes precision that the middle LG of step (2), LD type milling train carry out cold-rolling treatment is ± 0.05mm that surface roughness is Ra≤0.3 μ m; Plug material is for containing Si tool steel or high Cr tool steel, and average life span has improved 2～3 times than traditional GCr15 steel core bar; Pass deformation is 70%～85%.
5. the preparation technology of a kind of stainless steel tube according to claim 1, is characterized in that: the number of times of the cleaning in step (3) is 2, and the solvent that cleaning by degreasing adopts is diesel oil, and pickling time is 7-8 hour for the first time, and pickling time is more than 4 hours for the second time; What drain employing is to be greater than the tilting rack of 30 ℃.
6. the preparation technology of a kind of stainless steel tube according to claim 1, is characterized in that: the diameter of the fly bomb that the middle fly bomb inwall of step (4) is clean is greater than the 10%-20% of diameter of steel tube, and what material adopted is high-density sponge, is shaped as cylindrical structure.
7. the preparation technology of a kind of stainless steel tube according to claim 1, it is characterized in that: the drying plant in step (5) has been removed traditional air supply duct, in heating cabinet, be provided with sandwich construction, heating-up temperature is 180 ° ± 50 °, and the power of drying plant is 30KW.
8. the preparation technology of a kind of stainless steel tube according to claim 1, it is characterized in that: in step (6), adopt in the non-oxidation continuous annealing furnace with protective gas and carry out non-oxidation heat treatment process, by increase heat shield and the high-temperature furnace mouth flame device for regulating direction that alumina silicate fibre blanket is made at continuous annealing furnace two ends; What heating cabinet adopted is plate armature.
9. the preparation technology of a kind of stainless steel tube according to claim 1, is characterized in that: the formula of the chemical passivation solution in step (7) is: nitric acid 22-27wt%, and chromic anhydride 1.5-2.2wt%, molybdic acid 4.5-6.5wt%, benzimidazole 6-9wt%, surplus is water.
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| CN113251903A (en) * | 2021-06-04 | 2021-08-13 | 苏州鑫玮冠电子科技有限公司 | Titanium rod production and processing method |
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| CN104492850A (en) * | 2014-12-02 | 2015-04-08 | 安徽天大石油管材股份有限公司 | Production method of high-finish steel tube |
| CN106826136A (en) * | 2017-03-27 | 2017-06-13 | 江苏浩盛洁净***有限公司 | A kind of stainless steel pipes production procedure |
| CN107377667A (en) * | 2017-04-21 | 2017-11-24 | 苏州贝思特金属制品有限公司 | A kind of stainless-steel seamless pipe coil pipe manufacture method of nickel-base alloy monel400 |
| CN107321814A (en) * | 2017-07-19 | 2017-11-07 | 浙江义腾特种钢管有限公司 | A kind of preparation technology of high-purity gas conveying stainless steel tube |
| CN108359998A (en) * | 2018-02-06 | 2018-08-03 | 上海神洲阳光特种钢管有限公司 | A kind of environment protection type corrosion resistant precision cold-rolled stainless steel tube aftertreatment technology |
| CN108359998B (en) * | 2018-02-06 | 2023-11-24 | 上海神洲阳光特种钢管有限公司 | Environment-friendly corrosion-resistant precise cold-rolled stainless steel pipe post-treatment process |
| CN109731859A (en) * | 2019-01-11 | 2019-05-10 | 湖州胜纯管道有限公司 | A kind of stainless steel pipe cleaning method |
| CN111014339A (en) * | 2019-12-27 | 2020-04-17 | 临清市东华轴承钢管有限责任公司 | Hot-working production process of bearing steel pipe |
| CN113251903A (en) * | 2021-06-04 | 2021-08-13 | 苏州鑫玮冠电子科技有限公司 | Titanium rod production and processing method |
| CN113275408A (en) * | 2021-06-18 | 2021-08-20 | 温州国乐不锈钢管业有限公司 | Production process and equipment of sanitary stainless steel pipe |
| CN116652600A (en) * | 2023-06-17 | 2023-08-29 | 长恩精机(长兴)有限公司 | Production line and process for pipe parts |
| CN116652600B (en) * | 2023-06-17 | 2024-03-15 | 长恩精机(长兴)有限公司 | Production line and process for pipe parts |
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Address after: 201499, 858, five-star village, South Bridge Town, Shanghai, Fengxian District Applicant after: SHANGHAI FENGXIAN STEEL PIPE FACTORY Address before: 201499, 858, five-star village, South Bridge Town, Shanghai, Fengxian District Applicant before: Shanghai Fengxian District Steel Pipe Factory |
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Application publication date: 20140402 |