CN102606810A - Manufacture method of low carbon nickel chrome molybdenum niobium alloy stainless steel seamless steel tube - Google Patents
Manufacture method of low carbon nickel chrome molybdenum niobium alloy stainless steel seamless steel tube Download PDFInfo
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- CN102606810A CN102606810A CN2012100756344A CN201210075634A CN102606810A CN 102606810 A CN102606810 A CN 102606810A CN 2012100756344 A CN2012100756344 A CN 2012100756344A CN 201210075634 A CN201210075634 A CN 201210075634A CN 102606810 A CN102606810 A CN 102606810A
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Abstract
The invention discloses a manufacture method of a low carbon nickel chrome molybdenum niobium alloy stainless steel seamless steel tube, which is used for manufacturing the low carbon nickel chrome molybdenum niobium alloy stainless steel seamless steel tube and includes the following steps: (1) first conducting the central drilling hole process on blank and checking the process, (2) then conducting heat processing on the blank after the drilling hole process, (3) conducting acid washing on the blank finishing heat processing, (4) conducting grinding, lubricating, cold drawing and rolling, deoiling on the blank finishing acid washing, (5) judging whether a finished product is satisfied and conducting solid solution heat treatment, straightening, constant cutting and acid washing on the finished product on yes judgment, (6) conducting solid solution heat treatment, straightening, constant cutting and acid washing on the middle product on no judgment, and (7) finally conducting checking, character spraying, packaging, weighing and product delivery on finished products. The manufacture method improves surface abrasion resistance of the low carbon nickel chrome molybdenum niobium alloy stainless steel seamless steel tube, improves performance standard, reduces manufacture cost and is simple in working procedure.
Description
Technical field
The present invention relates to a kind of stainless-steel seamless pipe production method, be specifically related to a kind of low-carbon nickel chrome molybdenum niobium alloy stainless-steel seamless pipe production method.
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.
Various aggressive mediums all have good corrosion proof low-carbon nickel chrome molybdenum niobium alloy.Because Kohlenstoffgehalt is low and through overstabilization heat treatment, even still do not have the sensitization tendency in 50 hours later on 650-900 ℃ of soak.Supply of material state is the soft annealing attitude, and its application area comprises the wet corrosion environment, and has obtained to be applied to the authentication of-196～450 ℃ of temperature, pressure containers.Other has the high-temperature applications that is applicable to that performance adjusts slightly, and the stainless steel red fuming nitric acid (RFNA) has good corrosion resistance, low price, superior performance.Because low-carbon nickel chrome molybdenum niobium alloy has comprehensively and good comprehensive performances; In all trades and professions, obtained to use widely; This all makes traditional low-carbon nickel chrome molybdenum niobium alloy can't reach requirement; The making method of traditional seamless steel pipe is made low-carbon nickel chrome molybdenum niobium alloy, not only wastes resource, and complex procedures.
Summary of the invention
The object of the invention has solved that low-carbon nickel chrome molybdenum niobium alloy stainless-steel seamless 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 low-carbon nickel chrome molybdenum niobium alloy stainless-steel seamless pipe production method; Be used to make low-carbon nickel chrome molybdenum niobium alloy stainless-steel seamless pipe; Said low-carbon nickel chrome molybdenum niobium alloy stainless-steel seamless pipe step of manufacturing comprise (1) at first blank carry out centre-drilling hole technology and check, (2) are necessary heat treatment after blank is holed then, pickling is carried out to accomplishing heat treated blank in (3); (4) then the good blank of pickling carries out reconditioning, lubricated, cold drawing and rolling, deoils; (5) judge whether to satisfy finished product, then carry out finished product solution heat treatment, aligning, Ding Qie and pickling in this way, (6) as be not then carry out centre article solution heat treatment, aligning, cut surely, pickling and repeating step (4); (7) end product is tested, and sprays word, packs, weighs and outbound.1100 ℃ ± 10 ℃ of the temperature of article solution heat treatment in the middle of said, 1080 ℃ ± 10 ℃ of the temperature of finished product solution heat treatment, the pickling solution composition in deoiling comprises nitric acid 12%-15% and hydrofluoric acid 1%-2%; Said low-carbon nickel chrome molybdenum niobium alloy stainless-steel seamless pipe comprises that nickel is 58%, chromium is that 20-23%, molybdenum are that 8%-10%, niobium are 3.15-4.15%, and iron is 5%, and aluminium is 0.4%; Titanium is 0.4%, and carbon is 0.1%, and manganese is 0.5%; Silicon is 0.5%, and cobalt is 1%, and phosphorus is 0.015%; Sulphur is 0.015%, said lubricated employing butter and lime, and proportioning is lime and butter 10:1.2-1.5.
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 scope of the rolling technological parameter amount of deformation of said cold drawing and rolling is 1.5%-1.6%.
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.
A kind of low-carbon nickel chrome molybdenum niobium alloy stainless-steel seamless pipe production method of the present invention has solved that low-carbon nickel chrome molybdenum niobium alloy stainless-steel seamless 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 low-carbon nickel chrome molybdenum niobium alloy stainless-steel seamless pipe production method 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; This a kind of low-carbon nickel chrome molybdenum niobium alloy stainless-steel seamless pipe production method is used to make low-carbon nickel chrome molybdenum niobium alloy stainless-steel seamless pipe, said low-carbon nickel chrome molybdenum niobium alloy stainless-steel seamless pipe step of manufacturing comprise (1) at first blank carry out centre-drilling hole technology and the check; (2) necessary heat treatment after blank is holed then; (3) carry out pickling to accomplishing heat treated blank, (4) then the good blank of pickling are carried out reconditioning, lubricated, cold drawing and rolling, are deoiled, and (5) judge whether to satisfy finished product; Then carry out finished product solution heat treatment, aligning, Ding Qie and pickling in this way; (6) as be not then carry out centre article solution heat treatment, aligning, cut surely, pickling and repeating step (4), (7) end product is tested, and the spray word, packs, weighs and outbound.
In one embodiment; A kind of low-carbon nickel chrome molybdenum niobium alloy stainless-steel seamless pipe production method of the present invention is used to make low-carbon nickel chrome molybdenum niobium alloy stainless-steel seamless pipe, said low-carbon nickel chrome molybdenum niobium alloy stainless-steel seamless pipe step of manufacturing comprise (1) at first blank carry out centre-drilling hole technology and the check; (2) necessary heat treatment after blank is holed then; (3) carry out pickling to accomplishing heat treated blank, (4) then the good blank of pickling are carried out reconditioning, lubricated, cold drawing and rolling, are deoiled, and (5) judge whether to satisfy finished product; Then carry out finished product solution heat treatment, aligning, Ding Qie and pickling in this way; (6) as be not then carry out centre article solution heat treatment, aligning, cut surely, pickling and repeating step (4), (7) end product is tested, and the spray word, packs, weighs and outbound.Said low-carbon nickel chrome molybdenum niobium alloy stainless-steel seamless pipe comprises that nickel is 58%, chromium is that 20-23%, molybdenum are that 8%-10%, niobium are 3.15-4.15%, and iron is 5%, and aluminium is 0.4%, and titanium is 0.4%; Carbon is 0.1%, and manganese is 0.5%, and silicon is 0.5%; Cobalt is 1%, and phosphorus is 0.015%, and sulphur is 0.015%.
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 time was controlled at 4.5-5 hour, and sour temperature control is between 20-30 ℃; Said lubricated employing butter and lime; Proportioning is lime and butter 10:1.2-1.5, the lime preparation: one-level electric furnace lime hydration is removed bits after 80-100 order steel sieve sieves; Deposition is anhydrated; Air dry to 8 becomes, (being that water content is 20%-40%), allocate in proportion with butter then and in stirrer, stir after again behind the thin up again gentle agitation do not get final product to there being the colloidal that oily ball exists.
Further specify; The scope of the rolling technological parameter amount of deformation of said cold drawing and rolling is 1.5%-1.6%; When deoiling, the cleaning of pipe be should guarantee, sulphur, phosphorus, lead and other low melting metal in heat treatment process, can not be contacted; Otherwise can damage the performance of material, should note removing such as dirts such as lubricant oil, fuel.Control time is at 30min, and proportioning nitric acid 12%-15%+ hydrofluoric acid 1%-2% plays the effect of deoiling enough fast and effectively and tube surface is 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 again, 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.1100 ℃ ± 10 ℃ of the temperature of middle article solution heat treatment; 1080 ℃ ± 10 ℃ of the temperature of finished product solution heat treatment; Relation between holding time and the seamless steel pipe wall thickness is (2-3) min/mm; For obtaining best corrosion resistance; The type of cooling adopts water quick cooling to cross its 650 ℃ of sensitizing temperatures, and the material of thin walled tube also can adopt quick air cooling, and the above purpose reaches desirable surperficial decay resistance and improves; The 1.1-1.2 that improves the superior performance standard doubly, 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 again
Inconel?625?(UNS?N06625?/?W.Nr.2.4856)
The close trade mark
| GB/T | UNS | Trademark | JIS | W.Nr |
| NS336 | N06625 | Inconel625 | NCF625 | 2.4856 |
Factory's inner control chemical composition of Inconel 625:
The physical property of Inconel 625:
| Density | 8.4 g/cm 3 |
| Fusing point | 1290-1350℃ |
Inconel 625 is factory's inner control mechanical property at normal temperatures
| Alloy state | Tensile strength Rm N/mm 2 | Yield strength RP0.2 N/mm 2 | Specific elongation A5 % | Brinell hardness HB |
| Gu melt | 840-920 | 380-410 | 50-60 | ≤210 |
Inconel 625 alloys have following characteristic: 1, the various aggressive mediums to oxidation and reducing environment all have very outstanding anti-corrosion capacity; 2, the outstanding anti-pitting corrosion and the ability of crevice corrosion; And can not produce because the stress corrosion cracking that chloride causes; 3, outstanding inorganic acid resistance corrosion ability, like the mixed acid of nitric acid, phosphoric acid, sulfuric acid, hydrochloric acid and sulfuric acid and hydrochloric acid etc., 4, the ability of outstanding anti-various inorganic acid mixed solutions corrosion; When 5, temperature reaches 40 ℃; In the hydrochloric acid solution of various concentration, all can show good corrosion resisting property, 6, good processability and weldability, cracking sensitivity after the solderless; 7, have the manufacturing authentication of wall temperature, 8, meet the highest standard grade VII that the sour gas environment uses through the NACE of NACE standard authentication (MR-01-75) at-196～450 ℃ pressurized container.
The structure of Inconel 625: 625 is centroid cubic lattice structure.When after the time, also being converted into stable Ni3 (Nb, Ti) rhombic lattice phase mutually with unsettled quaternary with separating out carbon granule at about 650 ℃ of insulation long enoughs.Molybdenum after the solution strengthening in the nickel chromium triangle matrix, niobium composition will improve the mechanical property of material, but plasticity can decrease.
The corrosion resistance of Inconel 625: 625 alloys all show fabulous corrosion resistance in a lot of media.The performance that in chloride media, has outstanding anti-spot corrosion, crevice corrosion, intergranular corrosion and erosion.Have good inorganic acid resistance corrosivity,, in oxidation and reducing environment, also have performance alkaline-resisting and the organic acid corrosion simultaneously like nitric acid, phosphoric acid, sulfuric acid, hydrochloric acid etc.Effective resisting chloride ion penetration reducibility stress corrosion cracking.In seawater and industrial gas environment, produce corrosion hardly, seawater and salt solution had very high corrosion resistance, when high temperature too.Insensitivity in the welding process.In static state or circulation environment, all have anti-carbonization and oxidability, and anti-chloride gas attack.
Inconel 625 application area applications have: the low-carbon alloy 625 after the soft annealing is widely used in chemical-process industry, and corrosion resistance and high tenacity make it as thin structure member preferably.625 alloys can be applied to the occasion that contacts seawater and bear high mechanical stress.Typical field of application: 1, the parts of the organic chemistry flow process of chloride; Especially in the occasion of using the acid chloride catalyzer; 2, be used to make the digester and the bleaching occasion of pulp and paper industry; 3, the absorption tower in the flue gas desulphurization system, reheater, flue gas inlet baffle plate, fan (humidity), stirrer, guide plate and flue etc.; 4, be used to make equipment and the parts that are applied to the sour gas environment, 5, acetate and acetic anhydride reaction generator, 6, the condensation of sulfuric acid device.A kind of low-carbon nickel chrome molybdenum niobium alloy stainless-steel seamless pipe production method of the present invention has solved that low-carbon nickel chrome molybdenum niobium alloy stainless-steel seamless 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 (5)
1. low-carbon nickel chrome molybdenum niobium alloy stainless-steel seamless pipe production method; Be used to make low-carbon nickel chrome molybdenum niobium alloy stainless-steel seamless pipe; It is characterized in that: said low-carbon nickel chrome molybdenum niobium alloy stainless-steel seamless pipe step of manufacturing comprise (1) at first blank carry out centre-drilling hole technology and check, (2) are necessary heat treatment after blank is holed then, pickling is carried out to accomplishing heat treated blank in (3); (4) then the good blank of pickling carries out reconditioning, lubricated, cold drawing and rolling, deoils; (5) judge whether to satisfy finished product, then carry out finished product solution heat treatment, aligning, Ding Qie and pickling in this way, (6) as be not then carry out centre article solution heat treatment, aligning, cut surely, pickling and repeating step (4); (7) end product is tested, and sprays word, packs, weighs and outbound.
2. 1100 ℃ ± 10 ℃ of the temperature of article solution heat treatment in the middle of said, 1080 ℃ ± 10 ℃ of the temperature of finished product solution heat treatment, the pickling solution composition in deoiling comprises nitric acid 12%-15% and hydrofluoric acid 1%-2%; Said low-carbon nickel chrome molybdenum niobium alloy stainless-steel seamless pipe comprises that nickel is 58%, chromium is that 20-23%, molybdenum are that 8%-10%, niobium are 3.15-4.15%, and iron is 5%, and aluminium is 0.4%; Titanium is 0.4%, and carbon is 0.1%, and manganese is 0.5%; Silicon is 0.5%, and cobalt is 1%, and phosphorus is 0.015%; Sulphur is 0.015%, said lubricated employing butter and lime, and proportioning is lime and butter 10:1.2-1.5.
3. low-carbon nickel chrome molybdenum niobium alloy stainless-steel seamless pipe production method according to claim 1 is characterized in that: said blank check comprises the check of size, surface, Chemical composition and mechanical property etc.
4. low-carbon nickel chrome molybdenum niobium alloy stainless-steel seamless pipe production method according to claim 1, it is characterized in that: the scope of the rolling technological parameter amount of deformation of said cold drawing and rolling is 1.5%-1.6%.
5. low-carbon nickel chrome molybdenum niobium alloy stainless-steel seamless pipe production method 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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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103215473A (en) * | 2013-04-12 | 2013-07-24 | 苏州贝思特金属制品有限公司 | Low-carbon nickel-chromium-molybdenum-niobium 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 |
| CN103272877A (en) * | 2013-05-23 | 2013-09-04 | 苏州贝思特金属制品有限公司 | Low-carbon inconel seamless tube |
| CN103307367A (en) * | 2013-06-05 | 2013-09-18 | 南通耀龙金属制造有限公司 | Stainless steel drinking water pipeline and manufacturing method thereof |
| CN103322336A (en) * | 2013-06-25 | 2013-09-25 | 浙江国邦钢业有限公司 | Nickel-copper alloy pipe producing technology and nickel-copper alloy seamless steel pipe |
| CN103316949A (en) * | 2013-06-25 | 2013-09-25 | 浙江国邦钢业有限公司 | Corrosion-resistant alloy tube manufacturing process and corrosion-resistant alloy seamless steel tube |
| CN105441720A (en) * | 2015-11-10 | 2016-03-30 | 湖州华特不锈钢管制造有限公司 | Copper-nickel alloy seamless tube and manufacturing method thereof |
| CN106545708A (en) * | 2016-10-28 | 2017-03-29 | 无锡市永兴金属软管有限公司 | A kind of oil storage tank Antishocking metal hose and preparation method thereof |
| CN108130529A (en) * | 2017-12-22 | 2018-06-08 | 北京机科国创轻量化科学研究院有限公司 | A kind of particle enhanced nickel base metal powder for ultrahigh speed laser melting coating |
| CN110026734A (en) * | 2018-01-11 | 2019-07-19 | 关维良 | A kind of production technology of direct boring method cored steel |
| CN111283011A (en) * | 2020-03-09 | 2020-06-16 | 河北金奥管业有限公司 | Production method of seamless steel tube of automobile steering column |
| CN112647020A (en) * | 2020-12-11 | 2021-04-13 | 贵州电网有限责任公司 | Weather-resistant steel tower and preparation method thereof |
| CN115351519A (en) * | 2022-10-20 | 2022-11-18 | 江苏银环精密钢管有限公司 | Preparation method of inner cylinder for heat exchange unit of high-temperature gas cooled reactor evaporator |
| CN116408363A (en) * | 2023-04-06 | 2023-07-11 | 浙江久立特材科技股份有限公司 | Preparation method of nickel-molybdenum corrosion-resistant alloy seamless pipe and prepared seamless pipe |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103215473A (en) * | 2013-04-12 | 2013-07-24 | 苏州贝思特金属制品有限公司 | Low-carbon nickel-chromium-molybdenum-niobium 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 |
| CN103272877A (en) * | 2013-05-23 | 2013-09-04 | 苏州贝思特金属制品有限公司 | Low-carbon inconel seamless tube |
| WO2014187136A1 (en) * | 2013-05-23 | 2014-11-27 | 苏州贝思特金属制品有限公司 | Low-carbon nickel-chromium-iron alloy seamless tube |
| CN103307367A (en) * | 2013-06-05 | 2013-09-18 | 南通耀龙金属制造有限公司 | Stainless steel drinking water pipeline and manufacturing method thereof |
| CN103322336A (en) * | 2013-06-25 | 2013-09-25 | 浙江国邦钢业有限公司 | Nickel-copper alloy pipe producing technology and nickel-copper alloy seamless steel pipe |
| CN103316949A (en) * | 2013-06-25 | 2013-09-25 | 浙江国邦钢业有限公司 | Corrosion-resistant alloy tube manufacturing process and corrosion-resistant alloy seamless steel tube |
| CN105441720B (en) * | 2015-11-10 | 2018-04-24 | 湖州华特不锈钢管制造有限公司 | A kind of corronil seamless pipe and its manufacture method |
| CN105441720A (en) * | 2015-11-10 | 2016-03-30 | 湖州华特不锈钢管制造有限公司 | Copper-nickel alloy seamless tube and manufacturing method thereof |
| CN106545708A (en) * | 2016-10-28 | 2017-03-29 | 无锡市永兴金属软管有限公司 | A kind of oil storage tank Antishocking metal hose and preparation method thereof |
| CN108130529A (en) * | 2017-12-22 | 2018-06-08 | 北京机科国创轻量化科学研究院有限公司 | A kind of particle enhanced nickel base metal powder for ultrahigh speed laser melting coating |
| CN110026734A (en) * | 2018-01-11 | 2019-07-19 | 关维良 | A kind of production technology of direct boring method cored steel |
| CN110026734B (en) * | 2018-01-11 | 2021-01-01 | 关维良 | Production process of hollow steel by direct drilling method |
| CN111283011A (en) * | 2020-03-09 | 2020-06-16 | 河北金奥管业有限公司 | Production method of seamless steel tube of automobile steering column |
| CN112647020A (en) * | 2020-12-11 | 2021-04-13 | 贵州电网有限责任公司 | Weather-resistant steel tower and preparation method thereof |
| CN115351519A (en) * | 2022-10-20 | 2022-11-18 | 江苏银环精密钢管有限公司 | Preparation method of inner cylinder for heat exchange unit of high-temperature gas cooled reactor evaporator |
| CN115351519B (en) * | 2022-10-20 | 2023-08-22 | 江苏银环精密钢管有限公司 | Preparation method of inner cylinder for heat exchange unit of high-temperature gas cooled reactor evaporator |
| CN116408363A (en) * | 2023-04-06 | 2023-07-11 | 浙江久立特材科技股份有限公司 | Preparation method of nickel-molybdenum corrosion-resistant alloy seamless pipe and prepared seamless pipe |
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Application publication date: 20120725 |