CN102620062A - Method for manufacturing low-carbon resisto seamless stainless steel tubes - Google Patents
Method for manufacturing low-carbon resisto seamless stainless steel tubes Download PDFInfo
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Abstract
The invention discloses a method for manufacturing low-carbon resisto seamless stainless steel tubes. The method is used for manufacturing all-austenitic low-carbon resisto seamless stainless steel tubes, and includes steps of (1) checking a blank at first; (2) pickling the checked blank; (3) realizing polishing, opening trimming, cold rolling and oil removal for the pickled blank; (4) judging whether the blank meets requirements of a finished product or not, and performing finished product solid solution thermal treatment, straightening, finished product fixed-length cutting and finished product pickling if the blank meets the requirements of the finished product; (5) performing intermediate product solid solution thermal treatment, straightening, fixed-length cutting, and pickling and repeating the step (3) if the blank does not meet the requirements of the finished product; and (6) finally checking, spray-marking, packaging and weighing the finished product and then delivering the finished product out of a warehouse. By the aid of the method, corrosion resistance of the surfaces of the seamless steel tubes is increased, performance standard is improved, manufacturing cost is reduced, and a work procedure is simple.
Description
Technical field
The present invention relates to a kind of stainless-steel seamless pipe production method, be specifically related to a kind of resisto stainless-steel seamless pipe production method of full austenite low-carbon (LC).
Background technique
Stainless-steel seamless pipe is a kind of rectangular steel that hollow section, periphery do not have seam that have.It is the steel pipe of chemical etching property dielectric corrosions such as weak aggressive medium such as anti-air, steam, water and acid, alkali, salt.Claim the Stainless Acid Resistant Steel pipe again, along with the enforcement of China's policies of reform and opening to the outside world, national economy obtains to increase fast, and cities and towns dwelling house, public building and tourist facilities are built in a large number, and hot water service and domestic water supply have been proposed new requirement.Quality problem particularly, People more and more is paid attention to, and requires also to improve constantly.This tubing commonly used of Coating Steel Pipe, will step down from the stage of history under the influence of national relevant policies because of its susceptibility-to-corrosion gradually, and plastic tube, composite pipe and copper pipe have become the tubing commonly used of pipe-line system.But in many cases; Stainless Steel Tube more has superiority; Particularly the wall thickness thin-wall stainless steel that is merely 0.6～1.2mm is in drink water system, water heating system and water supply system that safety, health are put in the first place, has safe and reliable, hygienic environment-protecting, characteristics such as economic and practical.Being proved one of water supply system combination property tubing best, novel, energy-conservation and environment protection type by project practices at home and abroad, also is a kind of very competitive water-feeding pipes, will be to improving water quality, improving people's living standard and bring into play unrivaled effect.In the building water supply piping; The century-old brilliant history because Coating Steel Pipe has been through with; Various novel plastics pipe and composite pipe are developed rapidly; But various tubing also exist some shortcomings to some extent, far can not adapt to the needs and the requirement of country to potable water and relevant water quality of water supply piping fully.Therefore, relevant expert's prophesy: building water supply tubing finally will return to the epoch of metal tube.According to external application experience, assert that in metal tube thin-wall stainless steel is one of best tubing of combination property.
The Austenitic Stainless Steel production technology is functional, and particularly Chromiumnickel Austenite Stainless Steel adopts the conventional means of producing special steel can successfully produce plate, pipe, band, silk, bar and forging and the foundry goods of various regular sizes.Because alloying element (particularly chromium) content height and Kohlenstoffgehalt is low; The electric arc furnaces that adopt add aod (AOD) or this type of vacuum deaeration decarburization (VOD) method production in enormous quantities stainless steel material more; Be pilot for the senior trade mark can adopt vacuum or antivacuum non-induction furnace to smelt; Add the electroslag remelting in case of necessity, the Austenitic Stainless Steel red fuming nitric acid (RFNA) has good corrosion resistance, low price, superior performance.Because Austenitic Stainless Steel has comprehensively and good comprehensive performances; In all trades and professions, obtained to use widely; This all makes traditional austenite stainless steel seamless steel tube can't reach requirement; The making method of traditional seamless steel pipe is made the Ni-Fe-evanohm stainless-steel seamless pipe of full austenite low-carbon (LC), not only wastes resource, and complex procedures.
Summary of the invention
The object of the invention has solved that seamless steel pipe surface decay resistance improves, superior performance standard, reduced fabricating cost and operation is simple.
For solving the problems of the technologies described above; Technological scheme of the present invention is: a kind of resisto stainless-steel seamless pipe production method of low-carbon (LC); Be used to make the resisto stainless-steel seamless pipe of full austenite low-carbon (LC), the resisto stainless-steel seamless pipe step of manufacturing of said low-carbon (LC) comprises (1) at first check of blank, and the blank after (2) are checked then carries out pickling; (3) then the good blank of pickling carry out reconditioning, Ping Kou, cold rolling, deoil; (4) judge whether to satisfy finished product, then carry out finished product solution heat treatment, aligning, finished product in this way and cut surely and finished product acid-washing, (5) as be not then carry out centre article solution heat treatment, aligning, cut surely, pickling and repeating step (3); (6) end product is tested, and sprays word, packs, weighs and outbound.Between 1130 ℃ to 1140 ℃ of the temperature of article solution heat treatment in the middle of said; It is that 30-35%, chromium are that 19-23%, iron are 39.5%, carbon is 0.06-0.1% that the resisto stainless steel jointless ladle of said low-carbon (LC) is drawn together nickel; Manganese is 1.5%, and silicon is 1%, and copper is 0.75%; Sulphur is 0.015%, and aluminium+titanium is 0.85-1.2%.
In preferred embodiment of the present invention, said blank check comprises the check of size, surface, Chemical composition and mechanical property etc.
In preferred embodiment of the present invention, the composition that said blank carries out the pickling solution in the pickling comprises 12%-15% nitric acid and 5%-8% hydrofluoric acid, and the acid temperature is between 25 to 30 ℃.
In preferred embodiment of the present invention, said Checking of finished products comprises table inspection, hydraulic pressure, eddy current testing ET, ultrasonic flaw detection UT, intergranular corrosion, grain size, pull test, flaring test, flattening, hardness, analysis of carbon and sulfur.
The resisto stainless-steel seamless pipe production method of a kind of low-carbon (LC) of the present invention has solved that seamless steel pipe surface decay resistance improves, superior performance standard, has reduced fabricating cost and operation is simple.
Description of drawings
Fig. 1 is the structural representation of the resisto stainless-steel seamless pipe production method of low-carbon (LC) in the present invention's one preferred embodiment.
Embodiment
Below in conjunction with accompanying drawing preferred embodiment of the present invention is set forth in detail, thereby protection scope of the present invention is made more explicit defining so that advantage of the present invention and characteristic can be easier to it will be appreciated by those skilled in the art that.
Consult Fig. 1; The resisto stainless-steel seamless pipe production method of this a kind of low-carbon (LC); Be used to make the resisto stainless-steel seamless pipe of full austenite low-carbon (LC), the resisto stainless-steel seamless pipe step of manufacturing of said low-carbon (LC) comprises (1) at first check of blank, and the blank after (2) are checked then carries out pickling; (3) then the good blank of pickling carry out reconditioning, Ping Kou, cold rolling, deoil; (4) judge whether to satisfy finished product, then carry out finished product solution heat treatment, aligning, finished product in this way and cut surely and finished product acid-washing, (5) as be not then carry out centre article solution heat treatment, aligning, cut surely, pickling and repeating step (3); (6) end product is tested, and sprays word, packs, weighs and outbound.
In one embodiment; The resisto stainless-steel seamless pipe production method of a kind of low-carbon (LC) of the present invention; Be used to make the resisto stainless-steel seamless pipe of full austenite low-carbon (LC), the resisto stainless-steel seamless pipe step of manufacturing of said low-carbon (LC) comprises (1) at first check of blank, and the blank after (2) are checked then carries out pickling; (3) then the good blank of pickling carry out reconditioning, Ping Kou, cold rolling, deoil; (4) judge whether to satisfy finished product, then carry out finished product solution heat treatment, aligning, finished product in this way and cut surely and finished product acid-washing, (5) as be not then carry out centre article solution heat treatment, aligning, cut surely, pickling and repeating step (3); (6) end product is tested, and sprays word, packs, weighs and outbound.Between 1130 ℃ to 1140 ℃ of the temperature of article solution heat treatment in the middle of said; It is that 30-35%, chromium are that 19-23%, iron are 39.5%, carbon is 0.06-0.1% that the Ni-Fe of said full austenite low-carbon (LC)-evanohm stainless steel jointless ladle is drawn together nickel; Manganese is 1.5%, and silicon is 1%, and copper is 0.75%; Sulphur is 0.015%, and aluminium+titanium is 0.85-1.2%.
Further specify, said blank check comprises the check of size, surface, Chemical composition and mechanical property etc., and the composition that said blank carries out the pickling solution in the pickling comprises 12%-15% nitric acid and 5%-8% hydrofluoric acid; The thick scale of first pretreatment before carrying out pickling with nitric acid and hydrofluoric acid mixed acid, the control time, the acid temperature was between 25 to 30 ℃ at 3.5-4H; When cold rolling, the scope of rolling technological parameter small deformation amount λ is 2%-2.5%, when deoiling; Should guarantee the cleaning of pipe; In heat treatment process, can not contact sulphur, phosphorus, lead and other low melting metal, otherwise can damage the performance of material, should note removing such as dirts such as lubricant oil, fuel.Control time 40min, proportioning nitric acid 12%-15%+ hydrofluoric acid 1%-2% play the effect of deoiling enough fast and effectively and tube surface are not had the influence of turning white of any peracid.
Further specify, the sulphur content when solution heat treatment in the fuel is low more good more, and the Sulpher content in the rock gas should be less than 0.1%, and sulfur in heavy oil content should be less than 0.5%, and adds thermal-flame and can not directly burn to pipe.Between 1130 ℃ to 1140 ℃ of the temperature of middle article solution heat treatment; Between 1080 ℃ to 1090 ℃ of the temperature of finished product solution heat treatment; Relation between holding time and the seamless steel pipe wall thickness is (3-4) min/mm; For obtaining best corrosion resistance; The type of cooling adopts water quick cooling to cross its 650 ℃ of sensitizing temperatures; the material of thin walled tube also can adopt quick air cooling, and the above purpose reaches 1.1-1.2 that desirable surperficial decay resistance improves superior performance standard doubly, and said Checking of finished products comprises table inspection, hydraulic pressure, eddy current testing ET, ultrasonic flaw detection UT, intergranular corrosion, grain size, pull test, flaring test, flattening, hardness, analysis of carbon and sulfur.
Further specify
| UNS | Trademark | Germany | Britain | France | ISO | W.Nr |
| N08811 | Incoloy800HT | X10NiCrAlTi3220 | NA15 | Z8NC32.21 | FeNi32Cr21AlTi | 1.4954 |
The chemical composition of factory's inner control of Incoloy 800HT:
The physical property of Incoloy 800HT:
| Density | 8.0 g/cm3 |
| Fusing point | 1350-1400?℃ |
Incoloy 800HT is the mechanical property of factory's inner control at normal temperatures
| Alloy | Tensile strength Rm N/mm 2 | Yield strength RP 0.2 N/mm 2 | Specific elongation A5 % |
| No8811 | 550-600 | 230-260 | 55-65 |
The Incoloy800HT alloy is a kind of and Ni-Fe-evanohm isonomic full austenite the low-carbon (LC) of Incoloy 800 alloys, and the Co content in this alloy can be strict controlled in below 0.01%.The a lot of aggressive medium corrosion of Incoloy800HT alloy ability.Its higher Ni content makes it that good stress-corrosion-cracking resistance arranged under the water-based etching condition.High-Cr makes it to have better anti-pitting corrosion and crevice corrosion cracking performance.This alloy has good anti-nitric acid, organic acid corrosivity, but the corrosion resistance in sulfuric acid and hydrochloric acid is limited.Except that the possible origination point corrosion of halide, in oxidability and non-oxidizable salt, 800HT has good corrosion resistance.In the mixture of water, steam and steam, air, carbon dioxide, also has good corrosion resistance.
The 800HT alloy has following characteristic: 1, in the aqueous medium of the very high temperature up to 500 ℃, have outstanding corrosion resistance, 2, have outstanding yield strength in time more than 700 ℃, 3, the good performance of stress corrosion resistant, 4, good processability.The structure of Incoloy 800HT: 800HT is a centroid cubic lattice structure.Extremely low Kohlenstoffgehalt has increased stability of structure and maximum anti-sensitization property and resistance to intergranular corrosion with the Ti:C ratio that has improved.Stress relieving about 950 ℃ has guaranteed aplitic texture.
The corrosion resistance of Incoloy 800HT: a lot of aggressive medium corrosion of 800HT ability.Its higher nickel content makes it have good stress-corrosion-cracking resistance at the water-based etching condition.High chromium content makes it to have better anti-pitting corrosion and crevice corrosion cracking performance.This alloy has good anti-nitric acid, organic acid corrosivity, but the corrosion resistance in sulfuric acid and hydrochloric acid is limited.Except the possible origination point corrosion of halide, in oxidability and non-oxidizable salt, good corrosion resistance is arranged.In the mixture of water, steam and steam, air, carbon dioxide, also has good corrosion resistance.
Incoloy 800HT application area application has: 1, nitric acid condenser---anti-nitric acid corrosion; 2, steam-heating pipe---good mechanical property; 3, heating element pipe---good mechanical property, for the environment that is applied to up to 500 ℃, alloy supply of material attitude is an annealed state.The resisto stainless-steel seamless pipe production method of a kind of low-carbon (LC) of the present invention has solved that seamless steel pipe surface decay resistance improves, superior performance standard, has reduced fabricating cost and operation is simple.
Embodiment of the present invention; But protection scope of the present invention is not limited thereto; Any those of ordinary skill in the art are in the technical scope that the present invention disclosed, and variation or the replacement that can expect without creative work all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain that claims were limited.
Claims (4)
1. the resisto stainless-steel seamless pipe production method of a low-carbon (LC) is used to make the resisto stainless-steel seamless pipe of full austenite low-carbon (LC), and it is characterized in that: said stainless-steel seamless pipe step of manufacturing comprises (1) at first check of blank; (2) then the check after blank carry out pickling; (3) then the good blank of pickling carry out reconditioning, Ping Kou, cold rolling, deoil, (4) judge whether to satisfy finished product, then carry out finished product solution heat treatment, aligning, finished product in this way and cut surely and finished product acid-washing; (5) as be not then carry out centre article solution heat treatment, aligning, cut surely, pickling and repeating step (3); (6) end product is tested, and the spray word, packs, weighs and outbound, said in the middle of between 1130 ℃ to 1140 ℃ of the temperature of article solution heat treatment; It is that 30-35%, chromium are that 19-23%, iron are 39.5%, carbon is 0.06-0.1% that the resisto stainless steel jointless ladle of said low-carbon (LC) is drawn together nickel; Manganese is 1.5%, and silicon is 1%, and copper is 0.75%; Sulphur is 0.015%, and aluminium+titanium is 0.85-1.2%.
2. the resisto stainless-steel seamless pipe production method of low-carbon (LC) according to claim 1 is characterized in that: said blank check comprises the check of size, surface, Chemical composition and mechanical property etc.
3. the resisto stainless-steel seamless pipe production method of low-carbon (LC) according to claim 1, it is characterized in that: the composition that said blank carries out the pickling solution in the pickling comprises 12%-15% nitric acid and 5%-8% hydrofluoric acid, the acid temperature is between 25 to 30 ℃.
4. the resisto stainless-steel seamless pipe production method of low-carbon (LC) according to claim 1 is characterized in that: said Checking of finished products comprises table inspection, hydraulic pressure, eddy current testing ET, ultrasonic flaw detection UT, intergranular corrosion, grain size, pull test, flaring test, flattening, hardness, analysis of carbon and sulfur.
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| CN2012100756306A CN102620062A (en) | 2012-03-21 | 2012-03-21 | Method for manufacturing low-carbon resisto seamless stainless steel tubes |
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| CN2012100756306A CN102620062A (en) | 2012-03-21 | 2012-03-21 | Method for manufacturing low-carbon resisto seamless stainless steel tubes |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103215522A (en) * | 2013-04-12 | 2013-07-24 | 苏州贝思特金属制品有限公司 | Low-carbon nickel-iron-chromium alloy stainless-steel seamless pipe |
| CN103276250A (en) * | 2013-05-23 | 2013-09-04 | 苏州贝思特金属制品有限公司 | Nickel-chromium-iron alloy seamless tube |
| CN103361536A (en) * | 2013-05-23 | 2013-10-23 | 苏州贝思特金属制品有限公司 | Fully-austenitic low-carbon nickel-iron-chromium alloy seamless pipe |
| CN104174689A (en) * | 2014-07-21 | 2014-12-03 | 苏州贝思特金属制品有限公司 | Method for manufacturing 13CrMo44 alloy seamless steel pipe |
| CN105018699A (en) * | 2015-08-06 | 2015-11-04 | 无锡阳工机械制造有限公司 | Heat treatment technology for stainless steel |
| CN105063304A (en) * | 2015-08-06 | 2015-11-18 | 无锡阳工机械制造有限公司 | Galvanized steel heat treatment process |
| CN110014052A (en) * | 2019-05-23 | 2019-07-16 | 无锡市前洲无缝钢管有限公司 | A kind of manufacturing process of chemical fertilizer seamless steel pipe |
| CN111482483A (en) * | 2020-04-29 | 2020-08-04 | 浙江新航不锈钢有限公司 | Stainless steel seamless tube cold rolling production line and production process |
| CN114413675A (en) * | 2021-12-15 | 2022-04-29 | 合肥通用机械研究院有限公司 | Pipeline with Laval structure on inner surface and additive manufacturing method thereof |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103215522A (en) * | 2013-04-12 | 2013-07-24 | 苏州贝思特金属制品有限公司 | Low-carbon nickel-iron-chromium alloy stainless-steel seamless pipe |
| CN103276250A (en) * | 2013-05-23 | 2013-09-04 | 苏州贝思特金属制品有限公司 | Nickel-chromium-iron alloy seamless tube |
| CN103361536A (en) * | 2013-05-23 | 2013-10-23 | 苏州贝思特金属制品有限公司 | Fully-austenitic low-carbon nickel-iron-chromium alloy seamless pipe |
| CN103361536B (en) * | 2013-05-23 | 2015-04-15 | 苏州贝思特金属制品有限公司 | Fully-austenitic low-carbon nickel-iron-chromium alloy seamless pipe |
| CN104174689A (en) * | 2014-07-21 | 2014-12-03 | 苏州贝思特金属制品有限公司 | Method for manufacturing 13CrMo44 alloy seamless steel pipe |
| CN105018699A (en) * | 2015-08-06 | 2015-11-04 | 无锡阳工机械制造有限公司 | Heat treatment technology for stainless steel |
| CN105063304A (en) * | 2015-08-06 | 2015-11-18 | 无锡阳工机械制造有限公司 | Galvanized steel heat treatment process |
| CN110014052A (en) * | 2019-05-23 | 2019-07-16 | 无锡市前洲无缝钢管有限公司 | A kind of manufacturing process of chemical fertilizer seamless steel pipe |
| CN111482483A (en) * | 2020-04-29 | 2020-08-04 | 浙江新航不锈钢有限公司 | Stainless steel seamless tube cold rolling production line and production process |
| CN114413675A (en) * | 2021-12-15 | 2022-04-29 | 合肥通用机械研究院有限公司 | Pipeline with Laval structure on inner surface and additive manufacturing method thereof |
| CN114413675B (en) * | 2021-12-15 | 2023-10-13 | 合肥通用机械研究院有限公司 | Pipeline with Laval structure on inner surface and additive manufacturing method thereof |
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Application publication date: 20120801 |