CN103316949A - Corrosion-resistant alloy tube manufacturing process and corrosion-resistant alloy seamless steel tube - Google Patents
Corrosion-resistant alloy tube manufacturing process and corrosion-resistant alloy seamless steel tube Download PDFInfo
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Abstract
The invention provides a corrosion-resistant alloy tube manufacturing process which is used for manufacturing a corrosion-resistant alloy seamless steel tube. The corrosion-resistant alloy tube manufacturing process comprises the following steps of: (1) detecting a blank, and cutting; (2) performing ash-coating, mandrel forming, reshaping and deoiling on the cut blank, so as to obtain a semi-finished product; and (3) performing heat treatment, acid-washing treatment and groove treatment on the semi-finished product, so as to obtain the finished seamless steel tube product, wherein the temperature of the heat treatment is 1050-1200 DEG C. The tube manufacturing process is capable of increasing yield, improving product quality and saving energy, and simple in process; and the tensile strength is greater than 690MPA, the yield strength is greater than 276MPA, and the elongation is greater than 30%. The invention further provides a corrosion-resistant alloy seamless steel tube simultaneously.
Description
Technical field
The invention belongs to the seamless steel pipe preparation field, be specifically related to a kind of tube-making process and corrosion resistant alloy seamless steel pipe of corrosion resistant alloy.
Background technology
Seamless pipe is the hollow pipeline spare and accessory parts that utilize seamless steel pipe to form through deformation processing.Be used for pipeline connection, turn round, with footpath reduced pipe docking and horizontal selecting etc.Pipe fitting as pressure conveying, fluid gas.
UNS N06625 exempts from the good selection of local corrosion (spot corrosion and crevice corrosion), high corrosion fatigue strength, high tensile and resisting chloride ion penetration stress corrosion cracking in seawater.The hawser that it is used to moor a boat, the angle of rake blade of motor gunboat, submarine auxiliary pushing motor, submarine break away from the discharge duct of joint, extra large naval ship, protection overcoat, seabed sensing controler and the steam pipe line expansion joint etc. that submarine communication is used cable fast.Potential application comprise spring, sealing, control under water with expansion joint, cable connector, securing member, flexible apparatus and oceanography with meter unit etc.Excellent fatigue and thermal fatigue strength, oxidation drag, good welding and brazing performance make it at aviation field conduct be arranged very also.Sink and coat heat exchanger tube in ring and the environmental control system in anti-welding honeycomb structure, fuel oil and hydraulic system pipeline, spray wands, expansion joint, whirlpool in the conduit system of aircraft, engine exhaust system, thrust converting system, the engine mounting structure.Also be adapted at using in the thrust chamber pipeline of conversion lining, turbine sealing and compressor, blade and rocket engine of burning section.
Summary of the invention
The object of the present invention is to provide a kind of energy savings, the simple corrosion resistant alloy pipe fitting of operation technique, improve lumber recovery and product total quality, especially surface quality, tensile strength is greater than 690MPA, and yield strength is greater than 276MPA, and percentage elongation is greater than 30%.The present invention also provides a kind of corrosion resistant alloy seamless steel pipe that adopts above-mentioned preparation technology's preparation simultaneously.
The present invention is achieved through the following technical solutions:
A kind of tube-making process of corrosion resistant alloy for the manufacture of the corrosion resistant alloy seamless steel pipe, is characterized in that, may further comprise the steps:
(1) blank is detected, and blanking;
(2) blank after the blanking is carried out upper ash, core rod forming, shaping and the processing of deoiling, obtain semi-finished product;
(3) to described semi-finished product heat-treat, pickling processes and groove process, and obtains the finished product of seamless steel pipe; Wherein, described heat treated temperature is 1050 ° of C-1200 ° of C.
The further setting of the present invention is, the detection in the step (1) comprises dimension control, surface examination, quality inspection and chemical analysis check.
The further setting of the present invention is, the pickle that pickling processes described in the step (3) adopts is: weight ratio is 30% hydrofluoric acid and 99% nitric acid of 1:2, and all the other are water; Pickling temperature is controlled at 20 ° of C-60 ° of C.
The further setting of the present invention is, described step also comprises the product inspection step after (5).
The further setting of the present invention is, described product inspection step comprises surface examination, mechanical property, penetrant inspection, ultrasonic examination, Huey test, grain size test and flattening test.
The present invention also provides a kind of corrosion resistant alloy seamless steel pipe simultaneously, it is characterized in that, comprises following component:
Percentage by weight is to be no more than 0.1% C;
Percentage by weight is to be no more than 0.5% Mn;
Percentage by weight is to be no more than 0.5% Si;
Percentage by weight is to be no more than 0.015% P;
Percentage by weight is to be no more than 0.015% S;
Percentage by weight is the Cr between 20% to 23%;
Percentage by weight is the Nb+Ta between 3.15% to 4.15%;
Percentage by weight is to be no more than 1% Co;
Percentage by weight is the Mo between 8% to 10%;
Percentage by weight is to be no more than 5% Fe;
Percentage by weight is to be no more than 0.4% Al;
Percentage by weight is to be no more than 0.4% Ti;
Percentage by weight is to be not less than 58% Ni.
The present invention has the following advantages: ash, core rod forming, shaping on the process, deoil, the operations such as heat treatment, pickling, product quality guarantees; Can reach the superior function that this steel grade comprises fully.But the present invention's energy savings, operation be simple, improve lumber recovery and product total quality, especially surface quality, makes its tensile strength greater than 690MPA, and yield strength is greater than 276MPA, and percentage elongation is greater than 30%.
Description of drawings
Fig. 1 is the flow chart of the embodiment of the invention.
The specific embodiment
Below in conjunction with accompanying drawing preferred embodiment of the present invention is described in detail, thereby so that advantages and features of the invention can be easier to be those skilled in the art will recognize that protection scope of the present invention is made more explicit defining.
Referring to accompanying drawing 1, seamless steel pipe N01 refers to the round rectangular steel to hollow.
Detect N02: comprise dimension control, surface examination, quality inspection, chemical analysis check etc.
Blanking N03: the finished product (such as elbow, threeway, concentric reducer) to needs carries out the cutting of raw material length.
Upper grey N04: the material of blanking is lubricated, so that lower one processing and forming.
Core rod forming N05: utilize outer mold and inner core rod shaping and deformation, for the UNSN06625 material, determined the forming process of common secondary, be circulated to after the one-shot forming and go up again ash after the pickling and carry out the secondary core rod forming.
Shaping N06 repairs the shape of pipe fitting, and burr is removed.
The N07 that deoils because roll pull out often need in the distortion lubricated, add cold rolling wet goods auxiliary material, so need the oil that these are auxiliary to remove, make things convenient for subsequent production, improve surface quality.
Heat treatment N08, refer to pipe heating between 1050 ℃ to 1200 ℃, pass between temperature retention time and the tube wall thickness is (10-20) min/mm, wherein mm represents the unit millimeter of wall thickness, min represents the unit minute of temperature retention time, and temperature retention time is generally 6 times wall thickness on this basis.Through after the above-mentioned heat treatment, especially under suitable temperature, the pipe fitting of manufacturing can be given full play to the excellent properties of steel grade.
Pickling N09: it is 30% hydrofluoric acid and 99% nitric acid of 1:2 that the pickle in the described pickling processes adopts weight ratio, and remaining is water, and pickling temperature is controlled at 20-60 ℃.Pickle herein can thoroughly be removed oxide skin and corrosion thing on the steel surface, and surface quality is outstanding, and surface roughness Ra≤1.20 μ m is produced the sull of one deck densification at surfaces externally and internally, improve the stainless steel resistance to corrosion.Pickling time 12 hours.
Groove N10: with lathe pipe port is carried out fine finishining, angle 37.5 degree.
Product inspection N11 tests to the seamless pipe that production is finished, and the content of product inspection can be the tests such as surface examination, penetrating inspection, ultrasonic inspection, intercrystalline corrosion check, grain size detection, mechanical property, flaring test, flattening test.
The corrosion resistant alloy pipe fitting of making in the embodiment of the invention, mainly adopting the trade mark is the corrosion resistant alloy of UNSN06625, the corrosion resistant alloy of UNSN06625 belongs to nickelic, high molybdenum, high chromium acid resisting alloy steel.Have good activation-passivation and change ability, decay resistance is fabulous, in non-oxidizing acid such as sulfuric acid, acetic acid, formic acid, phosphoric acid, have good corrosivity, in neutral chloride ion-containing cut-off, have good pitting resistance, have simultaneously good anti-crevice corrosion and anti-stress corrosion performance.Be applicable to various concentration sulfuric acid below 100 ℃, under normal pressure, get corrosion resistance in the mixed acid of the acetic acid of anti-any concentration, any temperature and formic acid and acetic acid also fine.
Corrosion resistance: because UNS N06625 nickel content is very high (minimum 62%), therefore in the situation that general heat treatment and welding do not have Carbide Precipitation.Appear at the danger of intercrystalline corrosion after having eliminated so general heat treatment and having welded.Because high chromium nickel molybdenum content, and added copper, even so UNS N06625 in the reproducibility environment, as also being passivated in sulfuric acid and the formic acid.High nickel content makes it that lower corrosion rate also be arranged under activated state.In the bright sulfur acid, the serviceability temperature of UNS N06625 can be up to 40 degrees centigrade in the concentration range of 0-98%.In the pure phosphoric acid in the 0-85% concentration range, its corrosion resistance is extraordinary.In the industrial phosphoric acid that wet processing is produced, impurity has very strong impact to corrosion resistance.In all various phosphoric acid, UNS N06625 corrosion resistance is better than common stainless steel.In the nitric acid of strong oxidizing property, UNS N06625 compares in the steel grade of the high-alloying that does not contain molybdenum, and corrosion resistance is lower.In hydrochloric acid, the use of UNS N06625 only limits to lower concentration 1-2%.In this concentration range, the corrosion resistance of UNS N06625 is better than conventional stainless steel.UNS N06625 has just had very high pitting corrosion ability.Its anti-crevice corrosion ability also is good in chloride solution.The high nickel content of UNS N06625 has reduced the corrosion rate at pockmark and place, slit.When common austenitic stainless steel was higher than 60 degrees centigrade in temperature, the counter stress corrosion may be responsive in a muriatic environment of richness, by improving stainless nickel content, can reduce this sensitization.Because high nickel content, corrosion resistant alloy is at chloride solution, in concentrated hydroxide solution and the environment of rich hydrogen sulfide, has the very high stress corrosion resistant ability of breaking.
Corrosion resistant alloy is a kind of multiduty material, can both use at many industrial circles;
1, oil, pipelines and petrochemical pipelines etc.;
2, Coal Chemical Industry, boiler, heat exchanger etc.;
3, power plant flue gas desulfur device mainly uses the position to have; The tower body on absorption tower, flue, gear door-plate, internals, spray system etc.;
4, seawater treatment apparatus, seawater heat exchanger, paper industry equipment, sulfuric acid, nitric acid plant, relieving haperacidity, pharmaceuticals industry and chemical industry equipment thereof, pressure vessel, food apparatus etc.;
5, pharmaceutical factory: centrifuge, reactor etc.
Introduce the manufacture process of seamless steel pipe below in conjunction with accompanying drawing 1 message, need carry out seamless steel pipe N01 before the raw material production of seamless steel pipe, be used for guaranteeing the quality of raw material, guarantee the yield of subsequent production; Carry out blanking N03 through the qualified seamless steel pipe raw material of examination of materials N02, begin successively grey N04 on the step, core rod forming N05, shaping N06, the N07 that deoils, heat treatment N08, pickling N09, then carry out post forming: upper grey N04, core rod forming N05, shaping N06, the N07 that deoils, heat treatment N08, pickling N09, groove N10, product inspection N11, and the project of product inspection N11 also can be set according to different needs.
Heat treatment temperature among the present invention is between 1050 degrees centigrade to 1200 degrees centigrade, and optimum treatment temperature is 1130 degrees centigrade, and this temperature has following advantage: (1) makes alloy structure consistent with homogeneous chemical composition, and this is even more important to raw material.At high temperature atom action aggravation, chemical composition is tending towards evenly, just obtains uniform homogeneous structure after the cooling fast.(2) eliminate work hardening, be beneficial to continue cold working.By solution treatment, twisted lattice recovers, elongation and broken again crystallization of crystal grain, and internal stress is eliminated, and the tensile strength of steel pipe descends, and percentage elongation rises.(3) recover intrinsic corrosion resisting property.Because cold working causes Carbide Precipitation, lattice defect descends the stainless steel corrosion resisting property.The corrosion resisting property of solution treatment rear tubular member returns to optimum state.
What need to mention especially is that the component of the corrosion resistant alloy seamless steel pipe of the above-mentioned preparation technology's preparation of the employing in the present embodiment is:
Percentage by weight is to be no more than 0.1% C
Percentage by weight is to be no more than 0.5% Mn
Percentage by weight is to be no more than 0.5% Si
Percentage by weight is to be no more than 0.015% P
Percentage by weight is to be no more than 0.015% S
Percentage by weight is the Cr between 20% to 23%
Percentage by weight is the Nb+Ta between 3.15% to 4.15%
Percentage by weight is to be no more than 1% Co
Percentage by weight is the Mo between 8% to 10%
Percentage by weight is to be no more than 5% Fe
Percentage by weight is to be no more than 0.4% Al
Percentage by weight is to be no more than 0.4% Ti
Percentage by weight is to be not less than 58% Ni
Use corrosion resistant alloy, make seamless pipe have good decay resistance, anti-crevice corrosion and anti-stress corrosion performance performance.
By above-mentioned embodiment, be not difficult to find out that the present invention is a kind of energy savings, the pipe fitting technique of the simple corrosion resistant alloy of operation, the production problem of the important solution of patent of the present invention UNS N06625, improve lumber recovery and surface quality and the technology content of product, make its tensile strength greater than 690MPA, yield strength is greater than 276MPA, and percentage elongation is greater than 30%.
The above; it only is the specific embodiment of the present invention; but protection scope of the present invention is not limited to this; any those of ordinary skill in the art are in the disclosed technical scope of the present invention; 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 (6)
1. the tube-making process of a corrosion resistant alloy for the manufacture of the corrosion resistant alloy seamless steel pipe, is characterized in that, may further comprise the steps:
(1) blank is detected, and blanking;
(2) blank after the blanking is carried out upper ash, core rod forming, shaping and the processing of deoiling, obtain semi-finished product;
(3) to described semi-finished product heat-treat, pickling processes and groove process, and obtains the finished product of seamless steel pipe; Wherein, described heat treated temperature is 1050 ° of C-1200 ° of C.
2. the tube-making process of corrosion resistant alloy according to claim 1 is characterized in that: the detection in the step (1) comprises dimension control, surface examination, quality inspection and chemical analysis check.
3. the tube-making process of corrosion resistant alloy according to claim 1 is characterized in that: the pickle that pickling processes described in the step (3) adopts is: weight ratio is 30% hydrofluoric acid and 99% nitric acid of 1:2, and all the other are water; Pickling temperature is controlled at 20 ° of C-60 ° of C.
4. the technique of corrosion resistant alloy pipe fitting according to claim 1, it is characterized in that: described step also comprises the product inspection step after (5).
5. the technique of corrosion resistant alloy pipe fitting according to claim 1 is characterized in that: described product inspection step comprises surface examination, mechanical property, penetrant inspection, ultrasonic examination, Huey test, grain size test and flattening test.
6. a corrosion resistant alloy seamless steel pipe is characterized in that, comprises following component:
Percentage by weight is to be no more than 0.1% C;
Percentage by weight is to be no more than 0.5% Mn;
Percentage by weight is to be no more than 0.5% Si;
Percentage by weight is to be no more than 0.015% P;
Percentage by weight is to be no more than 0.015% S;
Percentage by weight is the Cr between 20% to 23%;
Percentage by weight is the Nb+Ta between 3.15% to 4.15%;
Percentage by weight is to be no more than 1% Co;
Percentage by weight is the Mo between 8% to 10%;
Percentage by weight is to be no more than 5% Fe;
Percentage by weight is to be no more than 0.4% Al;
Percentage by weight is to be no more than 0.4% Ti;
Percentage by weight is to be not less than 58% Ni.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104878248A (en) * | 2015-03-12 | 2015-09-02 | 江苏新华合金电器有限公司 | High temperature alloy 625H and technological making method thereof |
| CN107739893A (en) * | 2017-09-20 | 2018-02-27 | 无锡隆达金属材料有限公司 | High temperature alloy thin footpath thin-walled capillary pipe and preparation method thereof |
| CN108060376A (en) * | 2017-03-24 | 2018-05-22 | 浙江久立特材科技股份有限公司 | A kind of abros NS3304 seamless pipes high-yield-ratio, Hi-grade steel control method |
| CN110699572A (en) * | 2019-09-26 | 2020-01-17 | 江苏兴洋管业股份有限公司 | Large-diameter nickel-based composite pipe fitting and preparation method thereof |
| CN110777247A (en) * | 2019-10-31 | 2020-02-11 | 浙江国邦钢业有限公司 | NS1403 iron-nickel base alloy corrosion-resistant seamless pipe and preparation process thereof |
| CN111234863A (en) * | 2018-11-28 | 2020-06-05 | 无锡市新峰管业有限公司 | Forming process of slag oil fluidized bed hydrocracking alloy pipe fitting |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104878248A (en) * | 2015-03-12 | 2015-09-02 | 江苏新华合金电器有限公司 | High temperature alloy 625H and technological making method thereof |
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| CN107739893A (en) * | 2017-09-20 | 2018-02-27 | 无锡隆达金属材料有限公司 | High temperature alloy thin footpath thin-walled capillary pipe and preparation method thereof |
| CN111234863A (en) * | 2018-11-28 | 2020-06-05 | 无锡市新峰管业有限公司 | Forming process of slag oil fluidized bed hydrocracking alloy pipe fitting |
| CN111234863B (en) * | 2018-11-28 | 2021-09-17 | 无锡市新峰管业有限公司 | Forming process of slag oil fluidized bed hydrocracking alloy pipe fitting |
| CN110699572A (en) * | 2019-09-26 | 2020-01-17 | 江苏兴洋管业股份有限公司 | Large-diameter nickel-based composite pipe fitting and preparation method thereof |
| CN110777247A (en) * | 2019-10-31 | 2020-02-11 | 浙江国邦钢业有限公司 | NS1403 iron-nickel base alloy corrosion-resistant seamless pipe and preparation process thereof |
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Application publication date: 20130925 |