CN105463562A - Manufacturing method for seamless stainless steel pipe resistant to corrosion of anions - Google Patents
Manufacturing method for seamless stainless steel pipe resistant to corrosion of anions Download PDFInfo
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- CN105463562A CN105463562A CN201410452552.6A CN201410452552A CN105463562A CN 105463562 A CN105463562 A CN 105463562A CN 201410452552 A CN201410452552 A CN 201410452552A CN 105463562 A CN105463562 A CN 105463562A
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- stainless steel
- electrolytic solution
- corrosion
- electropolishing
- pipe
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Abstract
The invention discloses a manufacturing method for a seamless stainless steel pipe resistant to corrosion of anions. The manufacturing method includes the first step of manufacturing of a finished pipe and the second step of electropolishing. The second step of electropolishing further comprises the first procedure of selecting electrolyte, the second procedure of electrifying treatment and the third procedure of stirring. The finished seamless pipe made of Cr, Ni and Mo at a certain mass percentage is subjected to the electropolishing process, so that the thickness of the pipe wall of the seamless stainless steel pipe is uniform, the tolerance dimension is high in precision, and the seamless stainless steel pipe can bear corrosion of chloride ions and other media and meet the use requirements in a high-cleaning complex medium environment. The finished pipe also has the effect that the inner and outer surfaces are smooth and clean.
Description
Technical field
The present invention relates to seamless tube technical field, the manufacture method of the gapless stainless steel tube of a kind of resistance to negative ion corrosion specifically.
Background technology
Negatively charged ion refers to that atom obtains one or several electronics due to external influence, makes its outermost electron number reach rock steady structure; Common Anions has: chlorion Cl, sulfonium ion S2 and hydroxide radical OH.
Stainless steel and goods thereof, as technologic material and product, not only have good corrosion resistance nature, and have the multifrequency natures such as good slickness,
nationaleconomical and
the peoplehave in daily life and apply extremely widely, and range of application is more and more wider.
Austenitic stainless steel pipe is applicable in chemical industry, oil, petrochemical complex and power industry with the heat-exchange equipment of the heat-eliminating mediums such as river, underground water and seawater, also be applicable to manufacture argosy heat exchanger, deeply by the concern of oil, chemical industry, papermaking, food, Sweet natural gas, energy environment protection, light industry and machinery, medicine and other fields.
Along with the exploitation of clean energy, and petrochemical industry is flourish, get more and more in use austenitic stainless steel pipe road, adopt the stainless steel capital such as the 0Cr18Ni9 of ordinary method manufacture can not bear the corrosion of the media such as chlorion, the needs used under abrasive complex dielectrics environment can not be adapted to.
Therefore, the special manufacture method needing a kind of gapless stainless steel tube of resistance to negative ion corrosion, to solve problems of the prior art.
Summary of the invention
The object of the invention is to solve in prior art, the stainless steel tube manufactured by ordinary method can not bear the dielectric corrosions such as chlorion, the defect of the needs used under can not adapting to abrasive complex dielectrics environment, a kind of manufacture method of gapless stainless steel tube of resistance to negative ion corrosion is provided, solves problems of the prior art.
For achieving the above object, technical scheme of the present invention is as follows:
A manufacture method for the gapless stainless steel tube of resistance to negative ion corrosion, comprises following step:
Step one, production tube manufacture;
Step 2, electropolishing;
The electropolishing of step 2 comprises following operation
Operation one: select electrolytic solution, selects the electrolytic solution be made up of sulfuric acid, phosphoric acid, chromic anhydride; Or the electrolytic solution of sulfuric acid and citric acid composition; Or sulfuric acid, phosphoric acid, hydrofluoric acid composition mixed electrolytic solution;
Operation two: energising process, production tube connects the positive pole of direct supply as anode, and the electro-conductive material corroded with electrolyte resistance connects the negative pole of direct supply as Yin Ji ﹐, both immerse in electrolytic solution in a distance;
Operation three, stir process, by first end to the second end of production tube, electrolytic solution is at the uniform velocity passed through successively in each position of production tube.
A manufacture method for the gapless stainless steel tube of resistance to negative ion corrosion, the production tube of step one, contains in mass %
Below C:0.03%;
Below Si:1%;
Below Mn:2%;
Below P:0.035%;
Below S:0.03%;
Cr：16％—18％；
Ni：12％—15％；
Mo:2%-3%, remainder comprises Fe and inevitable impurity element.
In the present invention, the use temperature of described electrolytic solution is 50 DEG C-70 DEG C.
Beneficial effect
The manufacture method of the gapless stainless steel tube of a kind of resistance to negative ion corrosion of the present invention, compared with prior art, Cr, Ni and the Mo accounting for certain mass percent is first adopted to manufacture finished product seamless tube, pass through electrolytic polishing process again, make gapless stainless steel tube thickness of pipe of the present invention even, tolerance dimension precision is high, and the corrosion can bearing the media such as chlorion and the needs used under adapting to abrasive complex dielectrics environment, finished product tubing also has smooth, the clean effect of surfaces externally and internally.
Embodiment
The present invention is further illustrated for following examples.
Embodiment
A manufacture method for the gapless stainless steel tube of resistance to negative ion corrosion, comprises following step:
Step one, finished product seamless stainless steel pipe manufacturer; In an embodiment of the present invention, the manufacture craft of production tube comprises
(1) the diameter 67mm of pipe, wall thickness 5.2mm, carry out reconditioning and solution annealing;
(2) first time rolls, and is rolled to diameter 38mm, wall thickness 2.3mm, then carries out first time and deoil and solution annealing;
(3) second time is rolled, and is rolled to diameter 25mm, wall thickness 1.3mm, then carries out second time and deoil and solution annealing;
(4) third time roll, be rolled to diameter 22mm, wall thickness 0.8mm, then carry out third time deoil, drying and clean annealing;
Roll, be rolled to diameter 19mm, wall thickness 0.5mm for (5) the 4th times, then carry out deoiling for the 4th time, dry and clean annealing;
Roll, be rolled to diameter 16mm, wall thickness 0.3mm for (6) the 5th times, then carry out deoiling for the 5th time, dry and clean annealing;
Roll, be rolled to diameter 14mm, wall thickness 0.2mm for (7) the 6th times, then carry out deoiling for the 6th time, dry and clean annealing.
In step 1 is to 3, because the diameter of tubing is comparatively large, therefore select solution annealing; Pipe surfaces externally and internally, by polishing machine reconditioning, adopts solution annealing before being deformed; First time is rolled to roll for the 6th time and adopts three roller finish-rolling process respectively.
First time deoils to the 6th cleanings such as adopting organic solvent, alkali lye and surfactant emulsifies liquid respectively of deoiling, the methods such as employing is cleaned, embathed, hydro-peening.
Described first time solution annealing, second time solution annealing, the 5th clean annealing and the 6th clean annealing, the temperature of annealing is all 1060 DEG C ~ 1080 DEG C, and the time is 45 ~ 80 minutes; Described third time clean annealing and the 4th clean annealing, the temperature of annealing is all 1050 DEG C ~ 1090 DEG C, and the time is 60 ~ 90 minutes.
Step 2, electropolishing.
In the present invention, the finished product gapless stainless steel tube of step one, contains in mass %
Below C:0.03%;
C is indispensable as the fundamental element of the raising strength of parent in steel.But when the surplus of C more than 0.3% is added, the toughness of steel and weldability reduce.Therefore, the upper limit that C measures is defined as 0.3%.Lower limit does not comprise 0.
Below Si:1%;
Si guarantees the necessary element of strength of parent.But if Si is more than 1%, then the toughness of HAZ reduces.Therefore, the upper limit that Si measures is defined as 1%.Lower limit does not comprise 0.
Below Mn:2%;
Mn guarantees strength of parent and the necessary element of toughness.Therefore, the Mn of interpolation less than 2% is needed.On the other hand, if Mn amount is more than 2%, then the toughness of HAZ significantly reduces.Lower limit does not comprise 0.
Below P:0.035%;
P is the element of the toughness affecting steel.If P is more than 0.035%, then the toughness of steel significantly reduces.Therefore P gauge is decided to be less than 0.035%.Lower limit comprises 0%.
Below S:0.03%;
S is the element of the toughness affecting steel.If S is more than 0.03%, then the toughness of steel significantly reduces.Therefore S gauge is decided to be less than 0.03%.Lower limit comprises 0%.
Cr：16％—18％；
Cr is the element of erosion resistance.The characteristic bearing the dielectric corrosions such as chlorion for the present invention has vital role, therefore Cr gauge is decided to be 16%-18%.
Ni：12％—15％；
Ni is the element that can improve physical strength.The toughness of gapless stainless steel tube can be improved, the performance of weldless steel tube of the present invention can be improved further, therefore Ni gauge is decided to be 12%-15%.
Mo:2%-3%, Mo is the element that can improve conductivity.The conductivity of finished product seamless tube can be improved, to the present invention, there is vital role, contribute to the electropolishing of step 2.Remainder comprises Fe and inevitable impurity element.
In embodiment 1, the production tube of step one, comprises Fe and inevitable impurity element containing C0.01%, Si0.1%, Mn1%, P0.015%, S0.01%, Cr16%, Ni12%, Mo2% and remainder in mass %.
In example 2, the production tube of step one, comprises Fe and inevitable impurity element containing C0.02%, Si0.5%, Mn1.5%, P0.025%, S0.02%, Cr17%, Ni13%, Mo2.5% and remainder in mass %.
In embodiment 3, the production tube of step one, comprises Fe and inevitable impurity element containing C0.03%, Si1%, Mn2%, P0.035%, S0.03%, Cr18%, Ni15%, Mo3% and remainder in mass %.
Thermal treatment temp controls: goods solid solution furnace solid solubility temperature 1040 DEG C ~ 1060 DEG C, and rate of heating is slightly slow, and roller-way rotating speed 350/n ~ 400/n finished product clean annealing temperature 1050 DEG C ~ 1080 DEG C roller-way rotating speed 7.5/n ~ 8.0/n come out of the stove.
The finished product gapless stainless steel tube made thus, tensile strength is 520Mpa-600Mpa, yield strength 205Mpa-270Mpa, and elongation after fracture is more than or equal to 50%, Rockwell hardness 70HRB-80HRB.
When gapless stainless steel tube concerned process steps operates:
(1) waste tube end breach of boring a hole will excise, and by an inspection surfaces externally and internally quality after pickling, removes the inside and outside defect of mark, and the receivable head that gathers materials of Pipe Cutting operation is concentrated and stacked, and is strictly on guard against mixing the differentiation of steel grade.
(2) should deoil clean before every time postheat treatment, accomplish that steel tube surface is dripped not Cheng Zhu, prevent carburizing.
(3) acid cleaning of steel tube adopts 6%-8%HF, 12%-15%HNO3 all the other be water, and pickle solution temperature is 40 DEG C ~ 60 DEG C, and pickling material object soaks after two hours and starts to rinse, till skin to be oxidized is clean.
(4) carry out surface examination after every time pickling, have crackle, pore, trachoma, draw the defects such as trace to answer rubbing down thoroughly to focus on inhomogeneity of wall thickness simultaneously.
(5), during cold rolling finished product, external diameter, wall thickness tolerance, finished product length be considered.Choose reasonable milling train top size, guarantees finished product accuracy quality.
(6) goods solid solution temperature 1050 DEG C ~ 1080 DEG C, rate of heating is slightly slow, roller-way rotating speed 350/n ~ 400/n
(7) note soaking time, finished product clean annealing temperature 1050 DEG C ~ 1080 DEG C roller-way rotating speed 7.5/n ~ 8.0/n come out of the stove.
(8) use plastics straightening roll when aligning finished product, will conscientiously clear up burr on straightening roll, Reasonable adjustment straightening roll angle parameter ensures straightening quality.
(9) each operation will conscientiously fill in process operations record, accomplishes that writing is clear, not hasty and careless.
(10) inspection after construction will enter glossing program after completing, and after first outer polishing, electropolishing (see electropolishing schedule of operation) conscientiously fills in process operations record.
(11) production tube sampling: stretching sample length 280mm flattens sample length 60 ~ 100mm and gets, hardness sample length 60mm mono-, brilliant rotten sample 80mm mono-by often criticizing on different two steel pipes.
(12) reviewer carries out check test work according to relevant criterion, and sample pipe carries out non-destructive test(ing)(NDT) after making and making by specified requirement.
(13) finished product is through after the assay was approved, spray mark, packaging on request, tubing wooden-box package, liner rainproof material, prevent from making moist in transit, and prevent collision, should not be in outdoor and dark and damp place and store, plastic bag should to be had in every case to pack packing list, gives user when tubing is delivered goods.
The electropolishing of step 2 comprises following operation
Operation one: select electrolytic solution, selects the electrolytic solution be made up of sulfuric acid, phosphoric acid, chromic anhydride; Or the electrolytic solution of sulfuric acid and citric acid composition; Or sulfuric acid, phosphoric acid, hydrofluoric acid and the mixed electrolytic solution that forms with oily similar compound thereof;
Phosphoric acid: the main component being polishing fluid, the phosphoric acid salt that it generates sticks to anode surface, plays an important role in the process of polishing.
Sulfuric acid: can polishing velocity be improved, but content can not be too high, in order to avoid cause corrosion.
Chromic anhydride: can polishing effect be improved, make surface-brightening.
Operation two: energising process, electrolytic solution is arranged in electrolyzer, the electro-conductive material of the electrolyte resistances such as production tube connects the positive pole of direct supply as anode, Yong Qian ﹑ stainless steel corrosion connects the negative pole of direct supply as Yin Ji ﹐, both immerse in electrolytic solution in a distance.
Operation three, stir process, by first end to the second end of production tube, electrolytic solution is at the uniform velocity passed through successively in each position of production tube; Because the length of seamless stainless-steel pipe is longer, can only arrange the electrolyzer that relative length is less, production tube can adopt the electropolishing mode of first end to the second end.
The use temperature of electrolytic solution is 50 DEG C-70 DEG C.
When electropolishing concerned process steps:
(1) density of results of regular determination solution, and add water in time or heat concentrated solution, the sulfuric acid in solution, phosphoric acid and chromic anhydride and chromic content answer periodic analysis and adjustment.
(2) control the temperature of electrolytic solution, between electrolytic solution use temperature 50 ~ 70 DEG C, preferred enforcement temperature is 53 DEG C, 65 DEG C or 69 DEG C, and the lower polishing velocity of temperature is comparatively slow, and luminance brightness declines.The higher electrolytic solution of temperature is accelerated the corrosion of product, easily causes product excessive erosion, and electrolytic solution effective constituent is decomposed, and should be heated to specified temperature, when temperature should quit work more than 90 DEG C when temperature is too low.
(3) solution of new preparation should be pressed when large cathode area (cathode area is greater than several times, anode) and be carried out energising process, a part of hexavalent chrome reduction is made to be trivalent chromium, if in use, then contrary when trivalent chromium increases too much, energising process is namely carried out when the little negative electrode of large anode.
(4) in use procedure because the content of anode dissolution iron raises gradually, as the content (Fe of iron
2o
3) will partly change or all change solution when reaching 7% ~ 8%.
(5) prepare: first that phosphoric acid is soluble in water with sulfuric acid mixing chromic anhydride, then the mixed solution of acid is poured into chromic anhydride heated in water solution 80 DEG C, slowly add under constantly stirring gelatin (now reacting fierce) reaction terminate after (after about 1h) solution be changed to uniform grass green.
Can add sulfuric acid (density 1.84) addition after aging is 6% of tank liquor, can with reference to 368A.H/L.
Gapless stainless steel tube electropolishing test of the present invention:
1, electrolysis mode is pipe point two electrolysis, electrolyte temperature 50 ~ 70 DEG C.
2, one: two equipment electrolyte temperature 90 DEG C is tested, another electrolyte temperature 80 DEG C.Through checking the steel pipe that electrolysis is good, qualification rate 40% unacceptable product defect mainly corrosion default accounts for 90%.
Conclusion: corrosion default Producing reason is inferred: 1. electrolyte temperature is too high.2. electrolytic solution Reusability overlong time, has all multielements and throw out to gather.
3, two: electrolyte temperature 80 DEG C of electric current 12 ~ 14V voltage 840 ~ 860A are tested.All no abnormal phenomenon.Divide two ends successively electrolysis, the first electrolysis of head end, electrolysis after tail end.
Conclusion: one end of first electrolysis is not substantially by electrolytic corrosion.One end major part of rear electrolysis is very serious by electrolytic corrosion.Infer thus, cause the reason of rear electrolysis one end corrosion default to be: after frock completes during beginning electrolysis, because pipe hectare is tiltedly placed, one end of first electrolysis is upper, one end of rear electrolysis under, electrolytic solution throw out in the process of flowing can accumulate in the posterior end of pipe.But in the process of field staff's operation, after completing the electrolysis of upper one end, pipe is turned one end under electrolysis, throw out is still just present in the pipe of rear electrolysis one end, thus causes lower one end pipe corrosion default phenomenon.
Sum up: product excessive erosion reason after electropolishing:
(1) excessive erosion position electric current is excessive;
(2) electrolyte temperature is too high;
(3) polishing time is long, causes excessive dissolution;
Settling mode:
(1) current density is adjusted;
(2) electrolyte temperature is adjusted;
(3) electrolysis time is shortened;
What after electropolishing, product occurred is white
look lookblock reason:
The upper steam bubble produced of table is failed to depart from time and is attached to surface or interior table has gas flow circuitry in polishing later product.
Settling mode:
(1) improve electrolysis density, gassing rate is strengthened so that bubble desorption;
(2) improve the stirring velocity of solution, increase the flowing of liquid.
Claims (3)
1. a manufacture method for the gapless stainless steel tube of resistance to negative ion corrosion, is characterized in that, comprise following step:
Step one, production tube manufacture;
Step 2, electropolishing;
The electropolishing of step 2 comprises following operation
Operation one: select electrolytic solution, selects the electrolytic solution be made up of sulfuric acid, phosphoric acid, chromic anhydride; Or the electrolytic solution of sulfuric acid and citric acid composition; Or sulfuric acid, phosphoric acid, hydrofluoric acid composition mixed electrolytic solution;
Operation two: energising process, production tube connects the positive pole of direct supply as anode, and the electro-conductive material corroded with electrolyte resistance connects the negative pole of direct supply as Yin Ji ﹐, both immerse in electrolytic solution in a distance;
Operation three, stir process, by first end to the second end of production tube, electrolytic solution is at the uniform velocity passed through successively in each position of production tube.
2. the manufacture method of the gapless stainless steel tube of a kind of resistance to negative ion corrosion according to claim 1, is characterized in that: the production tube of step one, contains in mass %
Below C:0.03%;
Below Si:1%;
Below Mn:2%;
Below P:0.035%;
Below S:0.03%;
Cr：16％—18％；
Ni：12％—15％；
Mo:2%-3%, remainder comprises Fe and inevitable impurity element.
3. the manufacture method of the gapless stainless steel tube of a kind of resistance to negative ion corrosion according to claim 2, is characterized in that: the use temperature of described electrolytic solution is 50 DEG C-70 DEG C.
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| CN201410452552.6A CN105463562A (en) | 2014-09-05 | 2014-09-05 | Manufacturing method for seamless stainless steel pipe resistant to corrosion of anions |
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Cited By (2)
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| CN106826136A (en) * | 2017-03-27 | 2017-06-13 | 江苏浩盛洁净系统有限公司 | A kind of stainless steel pipes production procedure |
| CN109136748A (en) * | 2018-08-02 | 2019-01-04 | 浙江久立特材科技股份有限公司 | A kind of stabilisation type stainless steel seamless pipe and its manufacturing method |
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Application publication date: 20160406 |