CN105927809A - Bimetal wear resisting bent pipe - Google Patents

Bimetal wear resisting bent pipe Download PDF

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Publication number
CN105927809A
CN105927809A CN201610341857.9A CN201610341857A CN105927809A CN 105927809 A CN105927809 A CN 105927809A CN 201610341857 A CN201610341857 A CN 201610341857A CN 105927809 A CN105927809 A CN 105927809A
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CN
China
Prior art keywords
metal layer
layer
metal
duplex
abrasion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201610341857.9A
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Chinese (zh)
Inventor
常冠钦
陆钢
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BEIJING BEIKE ENVIRONMENT ENGINEERING CO LTD
Original Assignee
BEIJING BEIKE ENVIRONMENT ENGINEERING CO LTD
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BEIJING BEIKE ENVIRONMENT ENGINEERING CO LTD filed Critical BEIJING BEIKE ENVIRONMENT ENGINEERING CO LTD
Priority to CN201610341857.9A priority Critical patent/CN105927809A/en
Publication of CN105927809A publication Critical patent/CN105927809A/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L43/00—Bends; Siphons
    • F16L43/001—Bends; Siphons made of metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D13/00—Centrifugal casting; Casting by using centrifugal force
    • B22D13/02—Centrifugal casting; Casting by using centrifugal force of elongated solid or hollow bodies, e.g. pipes, in moulds rotating around their longitudinal axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/16—Casting in, on, or around objects which form part of the product for making compound objects cast of two or more different metals, e.g. for making rolls for rolling mills
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/10—Oxidising
    • C23C8/12—Oxidising using elemental oxygen or ozone
    • C23C8/14—Oxidising of ferrous surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
    • F16L57/06—Protection of pipes or objects of similar shape against external or internal damage or wear against wear
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
    • F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
    • F16L58/04—Coatings characterised by the materials used
    • F16L58/08—Coatings characterised by the materials used by metal

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)

Abstract

The invention relates to a preparation method of a bimetal wear resisting bent pipe, and is characterized by providing the bimetal wear resisting bent pipe under a high-temperature and high-corrosion environment. An inner layer of the wear resisting bent pipe is a special metal layer; the special metal layer is 5-10 mm thick; and the thickness thereof in the angular place is 1.1 times of the thickness in other places. The special metal layer adopts materials of C, Mn, Si, Ni, Cr, Mo, Bi, Er and the balance of Fe and a few amount of S, P and other impurities. The special metal layer has a thin and uniform passivation film, so that the wear resistance and the corrosion resistance of the bent pipe are improved. Bi added in the special metal layer is matched with MO in traditional metal to inhibit corrosion of the special metal layer from Cl-; and Er is added to greatly improve the corrosion resistance, the toughness and the hardness of the special metal layer. The preparation method not only can realize the material conveying under the high-temperature and high-corrosion environment, but also can effectively prolong the service life of the wear resisting pipe, and reduces the cost of the wear resisting pipe.

Description

A kind of duplex-metal abrasion-proof bent tube
Technical field
The present invention relates to a kind of duplex-metal abrasion-proof bent tube, be specifically related to a kind of bimetallic tee pipe fitting and elbow.
Background technology
In the industries such as mine, iron and steel, coal, electric power, material conveying is all to use long distance pressure conveying, and the pressure that pipeline especially tee pipe fitting and elbow bear is very big, weares and teares the most serious.Wear problem is pertained only in common material conveying process, when carrying some materials containing corrosive elements, abrasion is plus corrosion, the life-span that can allow tee pipe fitting and elbow drastically shortens, the duplex-metal abrasion-proof bent tube life-span in the market is no more than half a year, and expensive, seldom the material in ordinary enterprises uses in carrying.
Recent domestic has done numerous studies for bimetal wear resistant pipe fitting, and has had substantial amounts of market to apply, but bimetal wear resistant pipe still suffers from problems with: tee pipe fitting and elbow angled local life-span reduce one times than other part life-spans of pipeline；The raw materials such as most of mineral, coal dust all contain Cl-, when transporting for a long time, it is impossible to avoid the spot corrosion effect of Cl-；Expensive, it is 10-20 times of ordinary carbon steel.Duplex-metal abrasion-proof bent tube described in the invention, overcomes above-mentioned all problems, and the more massive application for wear-resistant pipe and abrasion-proof bent tube provides a kind of new approaches.
nullThe patent being currently used for bimetal wear resistant pipe and duplex-metal abrasion-proof bent tube has，Chinese patent: ZL201320022671.9 " a kind of bimetal wear resistant composite tube "，CN201210345990.3 " wear-resistant metal hose for powder delivery pipeline "，CN200810154873.2 " duplex-metal abrasion-proof bent tube and production method thereof "，CN201010102783.6 " bimetal metallurgy meets wear-resisting tube blank and production method thereof "，CN201110134399.9 is " a kind of wear-resisting、Corrosion-resistant、The manufacture method of shock resistance Bending Pipes "，ZL200920091285.9 " bimetal abrasion resistant compound elbow "，CN201410547994.9 " composite bimetal pipe high abrasion rich chromium cast iron and preparation method thereof " and CN201310684537.X " a kind of seamless composite steel tube of bimetal wear resistant and preparation method thereof ".The focus that research and development are cheap, the wear-resistant pipe of wear resistant corrosion resistant, especially abrasion-proof bent tube are material conveying industry.
Summary of the invention
The invention aims to solve bimetal wear resistant pipe expensive, wear-resisting and corrosion resistance is the highest, the life-span is short, it is impossible to meet the problem such as requirement of industrial and mining establishment.
A kind of duplex-metal abrasion-proof bent tube is to be formed through centrifugal casting fusion by inside and outside double layer of metal material, and outer tube is ordinary carbon steel, and inner tube is particulate metal layer.
Further, described particulate metal layer material is C, Mn, Si, Ni, Cr, Mo, Bi, Er, remaining is Fe and a small amount of S, P and other impurity, and content is C≤0.15 respectively, Mn≤0.5, Si≤0.5, Ni5-10, Cr20-35, Mo0.1-0.5, Bi0.01-0.05, Er0.01-0.05, total impurities≤0.1, remaining is Fe.High-chromium-nickel steel material has good anticorrosion, anti-wear performance, is the current essential material of bimetal wear resistant inner tube layer.But high-chromium-nickel steel material has a weakness, i.e. when conveying is containing Cl-material, it is susceptible to the different metal material of Cl-spot corrosion and adds Bi and Er, Bi at conventional extraordinary steel grade and can cooperate with the Mo in virgin metal, thus suppress the corrosion to particulate metal layer of Cl-.Finding through repetition test, the content of Bi maintains 0.01-0.05% and is i.e. effective against the accumulative effect of the mineral material corrosion that C 1 content is 5000mg/g, when Bi content increases to 0.06, can resist the accumulative effect of the mineral material corrosion that C 1 content is 8000mg/g.Considering anticorrosion and the rising violently of price that the addition due to Bi is brought, therefore the present invention selectes Bi content is 0.01-0.05%, and proportional example increases with the ratio of Mo.The addition of Er improves the corrosion resistance of inner layer metal material, and wearability the most largely, finds through repetition test, Er Yu Bi adds in proportion can play synergism so that the wearability of bimetallic bend pipe improves 10%.
Further, described particulate metal layer thickness is 5-10mm, find through repetition test, when particulate metal layer thickness is 5mm, its service life is suitable when being 20mm with presently commercially available bimetal wear resistant elbow thickness, when thickness is 10mm, when being 40mm with commercially available bimetal wear resistant elbow thickness quite, and the most the inner layer metal layer thickness of the wear-resistant bend of the marketization is above 10mm.The thickness in tee pipe fitting or the angled place of elbow is 1.1 times elsewhere.The place of going round curves of tee pipe fitting and elbow is easiest to abrasion, and the most all of tee pipe fitting and elbow the most do not do internal layer thickening and process.The present invention is not in order to affect the resistance of ducting, and the corresponding site thickeied at internal layer has done outer layer thinning process.Finding through computer simulation and repetition test, when tee pipe fitting or the angled position of elbow thicken 1.1 times, the life-span of tee pipe fitting or elbow can increase about 1 times.
Further, described particulate metal layer to be passivated complete in air ambient through Passivation Treatment, and passivation time is 2.5 hours, and passivation temperature is 80 DEG C, and passivation humidity is 40%.Passivation time is short, and particulate metal layer surface passivation be not thorough, and oversize waste operator's time and the energy of making again of passivation time increases personnel cost；Passivation temperature is the lowest, and required passivation time can significantly increase, and the highest local that can produce of passivation temperature is passivated excessively, and is not fully complete the phenomenon of passivation elsewhere；Passivation humidity is the lowest, can not form passivating film, and passivation humidity is the highest, and the passivation temperature of needs increases the most accordingly, wastes thermal source, and therefore the selection of passivating conditions is a series of system engineerings, needs long-term experience and sturdy theoretical knowledge to combine.The present invention finds with test chamber orthogonal test through computer simulation, passivation time 2.5 hours, passivation temperature 80 DEG C, and during passivation humidity 40%, passivating film is the most uniform, does not has exposed surface.
Having the beneficial effect that of the technique scheme of the present invention:
In such scheme, interpolation Bi is used for the shortcoming of current duplex-metal abrasion-proof bent tube, particulate metal layer of Er, and particulate metal layer will be through Passivation Treatment, and its angled place thickens process, solve current duplex-metal abrasion-proof bent tube and reduce one times in the angled local life-span than other part life-spans of pipeline；The spot corrosion effect of Cl-cannot be avoided；The problem such as expensive.
Accompanying drawing explanation
Fig. 1 be the embodiment of the present invention 2 72h in curent change trendgram.
Detailed description of the invention
Below in conjunction with embodiment, the invention will be further described, its object is to be better understood from present disclosure, but embodiments of the present invention are not limited to this.
Embodiment 1
Duplex-metal abrasion-proof bent tube of the present invention and certain famous brand duplex-metal abrasion-proof bent tube commercially available are done contrast test by the present embodiment.Duplex-metal abrasion-proof bent tube size of the present invention: ordinary carbon steel is outer tube, caliber 273mm, particulate metal layer inner tube diameter 250mm, ordinary carbon steel thickness 6mm, particulate metal layer thickness 5mm, angled place reinforcement thickness 5.5mm；Certain famous brand duplex-metal abrasion-proof bent tube size 1 commercially available: ordinary carbon steel is outer tube, caliber 273mm, high-chromium-nickel alloy layer inner tube diameter 250mm, ordinary carbon steel thickness 6mm, high chromium nickel wearing layer thickness 20mm；Certain famous brand duplex-metal abrasion-proof bent tube size 2 commercially available: ordinary carbon steel is outer tube, caliber 273mm, high-chromium-nickel alloy layer inner tube diameter 250mm, ordinary carbon steel thickness 6mm, high chromium nickel wearing layer thickness 10mm.Abrasion test uses SRV high temperature wear testing machine to do, and experimental condition is as follows: use reciprocating motion form, and contact form is face contact, and test temperature is 30 DEG C, test load 6N, frequency 30Hz, amplitude 2.0mm, test period 1440min.Result of the test is as shown in table 1:
Table 1 abrasion test measurement result (mm)
Sample source At non-angular Angled place Average abrasion Remarks
The present invention 0.125 0.256 0.1905
Certain famous brand 1 0.139 0.248 0.1935
Certain famous brand 2 0.479 0.844 0.6615
Knowable to above example, the duplex-metal abrasion-proof bent tube performance of the present invention is substantially better than certain famous brand commercially available.And the abrasion at angled place is about two times at non-angular, when bend pipe particulate metal layer thickness of the present invention is 5mm, anti-wear performance is suitable with the anti-wear performance that commercially available wearing layer thickness is 20mm.
Embodiment 2
The present embodiment will prepare three samples, and 1# sample is duplex-metal abrasion-proof bent tube of the present invention and has surface passivated membrane；2# sample copy invention duplex-metal abrasion-proof bent tube and without surface passivated membrane；3# sample is certain famous brand duplex-metal abrasion-proof bent tube commercially available.1#, 2#, 3# sample is cut into the sample of 10mm × 10mm × 3mm, and copper conductor of burn-oning, then by non-working surface i.e. ordinary carbon steel face epoxy encapsulation, make 3 sample electrodes is soaked in saturated Ca (OH) respectively2In solution.Control experiment temperature is at about 25 DEG C.Control electrode potential is Ep=+100mV (SCE).Under given constant potential, every 4h, in each simulated solution, instill a certain amount of NaCl, observe each electrode corrosion situation.In 72h, each solution curent change is as shown in Figure 1.
From fig. 1, it can be seen that 3 sample electric current difference within 72h are the biggest.1# sample current is always maintained at stable, until 70h just starts to uprush；2# sample electric current when 24h increases suddenly, and follow-up time keeps relative stability, and when 40h, electric current starts again to uprush；3# sample electric current when 17h increases suddenly, and successor keeps relative stability, and rises the most rapidly at 40h.When 72h, 2# and 3# sample have had macroscopic obvious corrosion to occur.Thus, it could be seen that the present invention is substantially better than commercially available famous brand through the corrosion resistance of the duplex-metal abrasion-proof bent tube of Passivation Treatment, even without Passivation Treatment is also eager to excel than the corrosion resistance of commercially available famous brand duplex-metal abrasion-proof bent tube.

Claims (5)

1. a duplex-metal abrasion-proof bent tube, it is characterised in that: outer tube is ordinary carbon steel, inner tube For particulate metal layer.
A kind of duplex-metal abrasion-proof bent tube the most according to claim 1, it is characterised in that: Inner tube particulate metal layer material is C, Mn, Si, Ni, Cr, Mo, Bi, Er, and remaining is Fe and a small amount of S, P and other impurity, content is C≤0.15 respectively, Mn≤0.5, Si≤0.5, Ni5-10, Cr20-35, Mo0.1-0.5, Bi0.01-0.05, Er0.01-0.05, total impurities≤0.1, Remaining is Fe.
A kind of duplex-metal abrasion-proof bent tube the most according to claim 1, it is characterised in that: Particulate metal layer thickness is the angled local particulate metal of 5-10mm, tee pipe fitting or elbow The thickness of layer is 1.1 times elsewhere, and corresponding outer layer metal correspondence position is than other positions Thin 1.1 times.
A kind of duplex-metal abrasion-proof bent tube the most according to claim 1, it is characterised in that: After internal layer particulate metal material and outer layer ordinary carbon steel metallurgical melting, through Passivation Treatment, in making Layer particulate metal layer has one layer of thin and uniform passivating film.
Passivation Treatment the most according to claim 4, is to complete in air ambient, blunt The change time is 2.5 hours, and passivation temperature is 80 DEG C, and passivation humidity is 40%.
CN201610341857.9A 2016-05-20 2016-05-20 Bimetal wear resisting bent pipe Pending CN105927809A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610341857.9A CN105927809A (en) 2016-05-20 2016-05-20 Bimetal wear resisting bent pipe

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Application Number Priority Date Filing Date Title
CN201610341857.9A CN105927809A (en) 2016-05-20 2016-05-20 Bimetal wear resisting bent pipe

Publications (1)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05269812A (en) * 1992-03-26 1993-10-19 Hitachi Metals Ltd Composite cylinder for high-temperature and high-pressure molding
CN101983864A (en) * 2010-11-01 2011-03-09 山东大学 Composite material of wear-resisting rod piece and preparation method thereof
CN103196006A (en) * 2013-04-18 2013-07-10 闻振翩 High-wear-resistance delivery pipe and manufacturing method thereof
CN105156769A (en) * 2015-07-14 2015-12-16 山东远大锅炉配件制造有限公司 Thermometal abrasion-resistant composite pipe

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05269812A (en) * 1992-03-26 1993-10-19 Hitachi Metals Ltd Composite cylinder for high-temperature and high-pressure molding
CN101983864A (en) * 2010-11-01 2011-03-09 山东大学 Composite material of wear-resisting rod piece and preparation method thereof
CN103196006A (en) * 2013-04-18 2013-07-10 闻振翩 High-wear-resistance delivery pipe and manufacturing method thereof
CN105156769A (en) * 2015-07-14 2015-12-16 山东远大锅炉配件制造有限公司 Thermometal abrasion-resistant composite pipe

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Application publication date: 20160907