CN104006257B - The preparation process of bellows in a kind of anti-chlorine ion corrosion expansion joint and expansion joint - Google Patents

The preparation process of bellows in a kind of anti-chlorine ion corrosion expansion joint and expansion joint Download PDF

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Publication number
CN104006257B
CN104006257B CN201410247783.3A CN201410247783A CN104006257B CN 104006257 B CN104006257 B CN 104006257B CN 201410247783 A CN201410247783 A CN 201410247783A CN 104006257 B CN104006257 B CN 104006257B
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Prior art keywords
bellows
internal layer
layer body
expansion joint
outer body
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CN201410247783.3A
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CN104006257A (en
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魏明义
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SANHUAN VALVE CO Ltd SHIJIAZHUANG
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SANHUAN VALVE CO Ltd SHIJIAZHUANG
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    • 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
    • F16L51/00—Expansion-compensation arrangements for pipe-lines
    • F16L51/02—Expansion-compensation arrangements for pipe-lines making use of bellows or an expansible folded or corrugated tube
    • F16L51/025—Expansion-compensation arrangements for pipe-lines making use of bellows or an expansible folded or corrugated tube with several corrugations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • 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
    • C23C8/60—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 solids, e.g. powders, pastes
    • C23C8/72—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 solids, e.g. powders, pastes more than one element being applied in one step
    • C23C8/74—Carbo-nitriding
    • C23C8/76—Carbo-nitriding 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
    • F16L11/00—Hoses, i.e. flexible pipes
    • F16L11/14—Hoses, i.e. flexible pipes made of rigid material, e.g. metal or hard plastics
    • F16L11/15—Hoses, i.e. flexible pipes made of rigid material, e.g. metal or hard plastics corrugated
    • 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
    • F16L23/00—Flanged joints
    • F16L23/02—Flanged joints the flanges being connected by members tensioned axially
    • F16L23/032—Flanged joints the flanges being connected by members tensioned axially characterised by the shape or composition of the flanges
    • 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
    • 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
    • F16L58/18—Protection of pipes or pipe fittings against corrosion or incrustation specially adapted for pipe fittings

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

Abstract

The preparation process of bellows in a kind of anti-chlorine ion corrosion expansion joint and expansion joint, bellows adopts double layer construction, outer body is made into by the stainless steel of atmospheric corrosion resistance, the internal layer body directly contacted with coal gas is made into by pure iron, in working process, recrystallization annealing process and carbonitriding process are carried out to bellows, the internal layer body of bellows is made to have good corrosion resistance, hardness, wear resistance, fatigue strength, toughness and ductility higher, decrease lattice quantity, lattice arrangement is orderly, bellows is made to recover original free energy, stress dispersion, be in steady state, the intergranular chemical corrosion face of chlorion to bellows is greatly reduced, slow down the rate of corrosion of chlorion to internal layer body, extend the working life of bellows, thus extend the working life of expansion joint.

Description

The preparation process of bellows in a kind of anti-chlorine ion corrosion expansion joint and expansion joint
Technical field
The invention belongs to elastic compensation element technical field, relate to a kind of expansion joint, particularly the preparation process of bellows in indispensable a kind of anti-chlorine ion corrosion expansion joint and expansion joint in gaspipe network conveying.
Background technique
Expansion joint is the additional stress compensated because temperature difference and mechanical vibration cause, and a kind of flexible structure be arranged on container shell or pipeline, it is as a kind of elastic compensation element of energy free-extension, there is the advantages such as reliable operation, functional, compact structure, be widely used in the departments such as chemical industry, metallurgy, nuclear energy.Expansion joint is indispensable device in gaspipe network conveying, use all in a large number in each iron and steel enterprise, it directly contacts with raw coke oven gas, wet gas, corrosion in bellows occurs constantly, particularly recent, domestic iron ore deposit lacks, under-supply, the smart iron powder of China relies on import mineral resources in a large number, to meet the needs of production, contact chloride seawater when fine ore is long in long-distance transport stores with harbour, chloride ion content is increased, in blast furnace process, chlorion can not disappear, and becomes harmful gas and survive among blast furnace gas.
The metal bellows of China, all adopts cooling formation technic to make, in Metal Forming Process, makes metal bending, change original shape, in this deformation process, metal receives flow harden, produces a large amount of internal stresss, the structure of metal there occurs the change of lattice structure constant, cause lattice distortion, arrange unordered, free energy declines, stress gathers, and prepares at any time to return to normal.Metallography theory " metal should carry out recrystallization annealing or tempering after flow harden " makes it recover lattice sequence routinely, eliminates internal stress, is in steady state, but is omitted by manufacturing enterprise in actual production, bellows is played pendulum for a long time.
It is generally acknowledged that the chlorion in metal bellows and coal gas reacts in metal surface in chemical corrosion, actually this is not so, and this is surface phenomenon, and this corrosion is the homogeneous corrosion of metal surface, and it does not have the degree of depth, can not cause the damage of tube wall.And real arch-criminal is " the brilliant point corrosion of electrostatic ", its presentation is countless pin holes in blocks, and these countless pin holes are the roots causing metal bellows blunt.Chlorine and metal have chemical reaction, and it all can erode metallic surfaces under any condition, and in coal gas except a large amount of inflammable gass, also containing moisture content, moisture is the promoter of chemical reaction.The lattice of metal bellows is distortion instability, and its moment is wanted to restore.Electrostatic is ubiquitous, and any space all exists static charge, just reacts as long as positive and negative charge satisfies the requirements.
As can be seen from above viewpoint, the chemical reaction of chlorion and metal surface is basis, it is internal cause that metal bellows lattice distortion exists internal stress, moisture in electrostatic interaction and coal gas is real murderer, and it accelerates chemical corrosion, has electricity to participate in producing electrochemical reaction, moisture promotes the intensity of electrochemical reaction, this shows, want to slow down the corrosion of chlorion to bellows, first will slow down the chemical reaction of chlorion and metal surface.
Summary of the invention
The present invention is in order to overcome the defect of prior art, devise the preparation process of bellows in a kind of anti-chlorine ion corrosion expansion joint and expansion joint, the internal layer body of bellows is made to have good corrosion resistance, hardness, wear resistance, fatigue strength, toughness and ductility higher, decrease lattice quantity, lattice arrangement is orderly, bellows is made to recover original free energy, stress dispersion, be in steady state, the intergranular chemical corrosion face of chlorion to bellows is greatly reduced, slow down the chemical reaction of chlorion and metal surface, thus slow down the rate of corrosion of chlorion to internal layer body, extend the working life of bellows, thus extend the working life of expansion joint.
Concrete technological scheme of the present invention is: a kind of anti-chlorine ion corrosion expansion joint, comprise bellows, the two ends of bellows are all provided with flange plate, connecting tube is provided with between bellows and flange plate, one end of connecting tube is fixedly connected with bellows, the other end of connecting tube is fixedly connected with flange plate, bellows, connecting tube, flange plate is coaxially arranged, key is: described bellows is formed by internal layer body and external pipe bluk recombination, internal layer body is made into by pure iron, outer body is made into by stainless steel, the external diameter of internal layer body equals the internal diameter of outer body.
The internal surface of described internal layer body infiltrates and has one deck carbonitrided case.
The thickness of described carbonitrided case is 0.03 ~ 0.06mm.
The surface of described flange plate offers multiple seal groove.
A preparation process for bellows in anti-chlorine ion corrosion expansion joint, key is: described preparation process comprises the following steps:
A, preparation pure iron plate and corrosion resistant plate are for subsequent use;
B, according to the girth of bellows internal layer body cross section to be formed and the length of internal layer body, the pure iron plate got ready in step a to be processed, obtain inner plating for subsequent use, according to the outer girth of body cross section of bellows to be formed and the length of outer body, the corrosion resistant plate got ready in step a is processed, obtain lamina rara externa for subsequent use;
C, by the inner plating obtained in step b and lamina rara externa respectively to being welded into tubular, obtain internal layer body and outer body is for subsequent use;
D, the outer body obtained by step c and connecting tube are welded and fixed;
E, the internal layer body obtained by step c to load in outer body and internal layer body and connecting tube are welded and fixed;
F, line: mark each crest location at the outer surface of outer body: if single ripple bellows, then the neutral position of external pipe body length is crest location; If double wave bellows, then respectively offset the position line of 1/2 wavelength up and down in the neutral position of outer tube length, two scribing position are crest location herein; Respectively offset the integral multiple of 1/2 wavelength or wavelength from the neutral position of external pipe body length up and down, the crest location of several ripple can be obtained;
G, by step f the crest location drawn aim at the slide block of forming machine, utilize the piston rod band movable cone of forming machine to extrude slide block and make ripple forming, then slide block is resetted, carry out second time according to next crest location shaping, repeat repeatedly, obtain shaping bellows;
H, carry out recrystallization annealing process to the shaping bellows that step g obtains: shaping bellows is heated to 650 ~ 700 DEG C, insulation 2 ~ 3h, then come out of the stove in furnace cooling to 200 ~ 300 DEG C;
I, carbonitriding process is carried out to the internal layer body of the bellows that step h obtains: be put into by bellows in carburizer, and organic compounds containing nitrogen is added in internal layer body, be heated to 500 ~ 600 DEG C, make inner tube surface infiltrate carbon atom and nitrogen-atoms simultaneously, insulation 2 ~ 3h, the thickness making carbonitrided case is 0.03 ~ 0.06mm, and after the time of advent, namely air cooling obtains required bellows.
Carburizer described in step I is Na 2cO 3, organic compounds containing nitrogen is urea (NH 2) 2cO.
The invention has the beneficial effects as follows: bellows adopts double layer construction, outer body is made into by the stainless steel of atmospheric corrosion resistance, the internal layer body directly contacted with coal gas is made into by pure iron, and pure iron quality is soft especially, and toughness is large especially, hot and cold good processability, there is good corrosion resistance, toughness and ductility higher, use this metal to decrease lattice quantity, the intergranular chemical corrosion face of chlorion to bellows is greatly reduced, extends the working life of expansion joint.
Recrystallization annealing process is carried out in bellows working process, make deformation crystal grain again crystallization be uniform equi-axed crystal, the internal stress that bellows produces in deformation process can be eliminated, make the lattice parameter that bellows recovers original, lattice arrangement is orderly, recover original free energy, stress dispersion, be in steady state.Adopt chemical heat treatment method, carbonitriding process is carried out to internal layer body, the internal surface of internal layer body is made to infiltrate one deck carbonitrided case, the carbon content of internal layer inner surface of tube body can be made to increase, thus improve the hardness, wear resistance, fatigue strength etc. of internal layer body, strengthen the anticorrosive intensity of internal layer body tube wall, slow down the rate of corrosion of chlorion to internal layer body.
Accompanying drawing explanation
Fig. 1 is the generalized section of expansion joint in the present invention.
Fig. 2 is the enlarged view of I in Fig. 1.
Fig. 3 is structural representation when utilizing forming machine making ripple.
In accompanying drawing, 1 represents flange plate, and 2 represent connecting tube, and 3 represent internal layer body, and 4 represent outer body, and 5 represent carbonitrided case, and 6 represent seal groove, and 7 represent slide block, and 8 represent piston rod, and 9 represent cone.
Embodiment
A kind of anti-chlorine ion corrosion expansion joint, comprise bellows, the two ends of bellows are all provided with flange plate 1, connecting tube 2 is provided with between bellows and flange plate 1, one end of connecting tube 2 is fixedly connected with bellows, the other end of connecting tube 2 is fixedly connected with flange plate 1, bellows, connecting tube 2, flange plate 1 is coaxially arranged, key is: described bellows is composited by internal layer body 3 and outer body 4, internal layer body 3 is made into by pure iron, outer body 4 is made into by stainless steel, the external diameter of internal layer body 3 equals the internal diameter of outer body 4, pure iron quality is soft especially, toughness is large especially, cold, hot-working character is good, there is good corrosion resistance.
The internal surface of described internal layer body 3 infiltrates and has one deck carbonitrided case 5, the carbon content on internal layer body 3 surface is increased, because carbon is insensitive to chlorion, so on the basis keeping the original performance of internal layer body 3, the anticorrosive intensity of internal layer body 3 can be strengthened, increase wear resistance, reduce deterioration.
The thickness of described carbonitrided case is 0.03 ~ 0.06mm, can reach 60 ~ 65HRC, meet usage requirement completely in the hardness of this thickness inner corrugated pipe.
The surface of described flange plate 1 offers multiple seal groove 6, puts seal ring, can improve sealing, make sealing effect better when adjacent expansion joint connects in seal groove.
A preparation process for bellows in anti-chlorine ion corrosion expansion joint, key is: described preparation process comprises the following steps:
A, preparation pure iron plate and corrosion resistant plate are for subsequent use;
B, according to the girth of bellows internal layer body 3 cross section to be formed and the length of internal layer body 3, the pure iron plate got ready in step a to be processed, obtain inner plating for subsequent use, according to the outer girth of body 4 cross section of bellows to be formed and the length of outer body 4, the corrosion resistant plate got ready in step a is processed, obtain lamina rara externa for subsequent use;
C, by the inner plating obtained in step b and lamina rara externa respectively to being welded into tubular, obtain internal layer body 3 and outer body 4 is for subsequent use;
D, the outer body 4 and the connecting tube that are obtained by step c are welded and fixed;
E, the internal layer body 3 obtained by step c to load in outer body 4 and internal layer body 3 and connecting tube are welded and fixed;
F, line: mark each crest location at the outer surface of outer body 4;
G, by step f the crest location drawn aim at the slide block 7 of forming machine, utilize the piston rod 8 of forming machine to be with movable cone 9 to extrude slide block 7 and make ripple forming, then slide block 7 is resetted, carry out second time according to next crest location shaping, repeat repeatedly, obtain shaping bellows;
H, recrystallization annealing process is carried out to the shaping bellows that step g obtains: shaping bellows is heated to 650 ~ 700 DEG C, insulation 2 ~ 3h, then come out of the stove in furnace cooling to 200 ~ 300 DEG C, recrystallization annealing requires more than heating temperatures to recrystallization temperature 150 ~ 250 DEG C, and the recrystallization temperature of iron is 450 DEG C, by heating, add the atoms permeating ability in material, make crystal grain generation recrystallization broken and twisted in steel after cold working, thus make intensity, the hardness decline of metal, and plasticity raises.
I, carbonitriding process is carried out to the internal layer body of the bellows that step h obtains: bellows is put into carburizer Na 2cO 3in, and in internal layer body 3, add organic compounds containing nitrogen urea (NH 2) 2cO, is heated to 500 ~ 600 DEG C, makes internal layer body 3 surface infiltrate carbon atom and nitrogen-atoms simultaneously, and insulation 2 ~ 3h, the thickness making carbonitrided case is 0.03 ~ 0.06mm, and after the time of advent, namely air cooling obtains required bellows.In conventional carbonitriding temperature range, along with the rising of temperature, permeating speed is significantly accelerated, but the surface layer concentration of nitrogen is more and more lower, and sharply decline, and the content of carbon improves gradually, particularly the depth of penetration of carbon atom improves greatly, but under high temperature, carbon atom diffusion is accelerated so the concentration of carbon reduces again after reaching certain value.When carbonitriding temperature is lower, surface easily forms the high nitrogen low carbon compound ε phase of fragility, can obtain nitrogenous cementite when temperature raises.In addition, due to the effect of nitrogen and the acting in conjunction of nitrogen carbon, remained austenite content after carbonitriding is than many during carburizing and to ooze temperature together relevant, the distribution of raising retained austenite in infiltration layer of temperature is deepened, and its quantity reduced before this with the rising of temperature and then increased with the rising of temperature, therefore through many experiments, temperature is controlled at 800 ~ 860 DEG C, while improving infiltration rate as far as possible, make to preserve certain nitrogen quantity in carbonitrided case 5, and reduce the appearance of compound layer in carbonitrided case 5, make carbonitrided case 5 after quenching remained austenite content adjust to certain value, reduce the distortion of internal layer body 3.
Provide comparing of the bellows that utilizes this preparation process to produce and existing bellows performance parameter below, as shown in table 1:
Table 1
Performance Existing bellows Bellows in the present invention
Young's modulus 190GPa 120GPa
Hardness 187HB Internal surface 60 ~ 65HRC
Corrosion resistance 1 6
Wear resistance 1 4
Yield strength 205MPa 290MPa
As shown in Table 1, in the present invention, the Young's modulus of bellows is less than the Young's modulus of existing bellows, when namely produced amount of deformation is identical, is less than the power applied existing bellows, reduces difficulty of processing to the power that bellows in the present invention applies.In the present invention, the hardness of bellows inside surface is 60 ~ 65HRC, and 20 ~ 67HRC is equivalent to 225 ~ 650HB, thus in the present invention the hardness 60 ~ 65HRC of bellows much larger than the hardness 187HB of existing bellows.
The corrosion resistance of bellows in the present invention, wear resistance, yield strength is also all much larger than the corrosion resistance of existing bellows, wear resistance, yield strength, it can thus be appreciated that, the internal layer body of bellows has good corrosion resistance, hardness, wear resistance, fatigue strength, toughness and ductility higher, decrease lattice quantity, lattice arrangement is orderly, bellows is made to recover original free energy, stress dispersion, be in steady state, the intergranular chemical corrosion face of chlorion to bellows is greatly reduced, slow down the chemical reaction of chlorion and metal surface, thus slow down the rate of corrosion of chlorion to internal layer body, extend the working life of bellows, thus extend the working life of expansion joint.

Claims (5)

1. an anti-chlorine ion corrosion expansion joint, comprise bellows, the two ends of bellows are all provided with flange plate (1), connecting tube (2) is provided with between bellows and flange plate (1), one end of connecting tube (2) is fixedly connected with bellows, the other end of connecting tube (2) is fixedly connected with flange plate (1), bellows, connecting tube (2), flange plate (1) is coaxially arranged, it is characterized in that: described bellows is composited by internal layer body (3) and outer body (4), internal layer body (3) is made into by pure iron, outer body (4) is made into by stainless steel, the external diameter of internal layer body (3) equals the internal diameter of outer body (4), described bellows has following process step to be prepared from:
A, preparation pure iron plate and corrosion resistant plate are for subsequent use;
B, according to the girth of bellows internal layer body (3) cross section to be formed and the length of internal layer body (3), the pure iron plate got ready in step a to be processed, obtain inner plating for subsequent use, according to the outer girth of body (4) cross section of bellows to be formed and the length of outer body (4), the corrosion resistant plate got ready in step a is processed, obtain lamina rara externa for subsequent use;
C, by the inner plating obtained in step b and lamina rara externa respectively to being welded into tubular, obtain internal layer body (3) and outer body (4) is for subsequent use;
D, the outer body (4) and the connecting tube that are obtained by step c are welded and fixed;
E, the internal layer body (3) obtained by step c to load in outer body (4) and internal layer body (3) and connecting tube are welded and fixed;
F, line: mark each crest location at the outer surface of outer body (4): if single ripple bellows, then the neutral position of outer body (4) length is crest location; If double wave bellows, then respectively offset the position line of 1/2 wavelength up and down in the neutral position of outer body (4) length, two scribing position are crest location herein; Respectively offset the integral multiple of 1/2 wavelength or wavelength from the neutral position of outer body (4) length up and down, the crest location of several ripple can be obtained;
G, by step f the crest location drawn aim at the slide block (7) of forming machine, the piston rod of forming machine (8) is utilized to be with movable cone (9) extruding slide block (7) to make ripple forming, then slide block (7) is resetted, second time is carried out shaping according to next crest location, repeat repeatedly, obtain shaping bellows;
H, carry out recrystallization annealing process to the shaping bellows that step g obtains: shaping bellows is heated to 650 ~ 700 DEG C, insulation 2 ~ 3h, then come out of the stove in furnace cooling to 200 ~ 300 DEG C;
I, carbonitriding process is carried out to the internal layer body (3) of the bellows that step h obtains: be put into by bellows in carburizer, and organic compounds containing nitrogen is added in internal layer body (3), be heated to 500 ~ 600 DEG C, make internal layer body (3) surface infiltrate carbon atom and nitrogen-atoms simultaneously, insulation 2 ~ 3h, the thickness making carbonitrided case is 0.03 ~ 0.06mm, and after the time of advent, air cooling can obtain required bellows.
2. a kind of anti-chlorine ion corrosion expansion joint according to claim 1, is characterized in that: the internal surface of described internal layer body (3) infiltrates and has one deck carbonitrided case (5).
3. a kind of anti-chlorine ion corrosion expansion joint according to claim 2, is characterized in that: the thickness of described carbonitrided case is 0.03 ~ 0.06mm.
4. a kind of anti-chlorine ion corrosion expansion joint according to claim 1, is characterized in that: the surface of described flange plate (1) offers multiple seal groove (6).
5. the preparation process of bellows in a kind of anti-chlorine ion corrosion expansion joint according to claim 1, is characterized in that: the carburizer described in step I is Na 2cO 3, organic compounds containing nitrogen is urea (NH 2) 2cO.
CN201410247783.3A 2014-06-05 2014-06-05 The preparation process of bellows in a kind of anti-chlorine ion corrosion expansion joint and expansion joint Expired - Fee Related CN104006257B (en)

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CN201651648U (en) * 2010-02-10 2010-11-24 武汉科技大学 Corrugated expansion joint
CN202280962U (en) * 2011-08-29 2012-06-20 马东海 Valve pipe orifice wear-resisting pipe for black water flash drum in coal chemical industry
CN202812628U (en) * 2012-10-08 2013-03-20 江苏晨光波纹管有限公司 Corrosion resisting ultralow-temperature corrugated expansion joint
CN203258281U (en) * 2013-03-30 2013-10-30 泰州华腾管道设备有限公司 Negative-pressure-resistant corrosion-resistant steel lining tetrafluoroethylene expansion joint
CN203880314U (en) * 2014-06-05 2014-10-15 石家庄三环阀门股份有限公司 Expansion joint resistant to chloride ion erosion

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