CN107675099A - Bent-tube boiler muffler - Google Patents
Bent-tube boiler muffler Download PDFInfo
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- CN107675099A CN107675099A CN201710727474.XA CN201710727474A CN107675099A CN 107675099 A CN107675099 A CN 107675099A CN 201710727474 A CN201710727474 A CN 201710727474A CN 107675099 A CN107675099 A CN 107675099A
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- Prior art keywords
- bent
- tube boiler
- bend pipe
- steel
- quench
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- 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
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
- C21D8/105—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
-
- 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
-
- 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
- C23C8/40—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 liquids, e.g. salt baths, liquid suspensions
- C23C8/58—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 liquids, e.g. salt baths, liquid suspensions more than one element being applied in more than one step
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/16—Selection of particular materials
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Manufacturing & Machinery (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The present invention relates to muffler, and in particular to bent-tube boiler muffler, belongs to mechanical material technical field.Bent-tube boiler muffler of the present invention includes bend pipe, housing and flange, and the bend pipe is made up of stainless steel material, and the stainless steel material includes the composition of following mass percent：C：0.1 0.14%, Si：0.5 1.0%, Mn：3 5%, Cr：20 22%, Nb：0.2 1.0%, remaining is Fe and inevitable impurity element.The present invention uses the rational steel of compatibility, and the methods of use solution treatment, Ageing Treatment, QPQ Quench-Polish-Quench technologies, obtained bend pipe can be made to have high intensity, so as to increase the intensity of bent-tube boiler muffler.
Description
Technical field
The present invention relates to muffler, and in particular to bent-tube boiler muffler, belongs to mechanical material technical field.
Background technology
In the past, in large-sized diesel motor, in order to improve its performance, forcibly sent as in the cylinder to the engine
Enter the structure of air and use supercharger.In recent years, in this supercharger, to improve the fuel utilization ratio of diesel engine
And for the purpose of cutting down nitrogen oxides (NOx), demand high-pressure ratio and high efficiency.Moreover, in response to such requirement, increase
Press is driven with rotating speed high than ever.If however, driving supercharger like this with high rotating speed, required property can be achieved
Energy (high-pressure ratio and high efficiency), but also result in noise grade and increase this baneful influence.
The content of the invention
The purpose of the present invention is above mentioned problem be present for existing technology, it is proposed that wear-resistant, function admirable bend pipe
Formula muffler.
The above-mentioned purpose of the present invention is realized by following technical solution：Bent-tube boiler muffler, the bent-tube boiler muffler
Including bend pipe, housing and flange, the bend pipe is made up of stainless steel material, and the stainless steel material includes following mass percent
Composition：C：0.1-0.14%, Si：0.5-1.0%, Mn：3-5%, Cr：20-22%, Nb：0.2-1.0%, remaining be Fe and
Inevitable impurity element.
Bent-tube boiler muffler of the present invention is based on bend pipe, with one group of expansion chambers that bend pipe and housing are formed and resonance
Room, reflection can occur when sound wave enters in muffler pipe with interference to reduce acoustic energy, end can connect using bulge technique
Flexible pipe is connect, is easy to assemble using accumulated error caused by each component processing of changeability solution of flexible pipe.Wherein, bend pipe of the present invention
Bend pipe in formula muffler uses above-mentioned stainless steel material, and in stainless steel material, Cr content is 20-22%, is a kind of high
Cr steel, the addition of Cr elements, which can be dissolved in the matrix of steel, plays solution strengthening effect, can also be combined to form with carbon (FeCr)3C、
(FeCr)7C3Etc. the carbide of form, so as to improve the elevated temperature strength of steel and wearability, therefore, the high Cr steel that the present invention uses,
With high intensity and wearability.
In addition, to improve the quenching degree of steel, it is originally bright to be also added into appropriate Mn members so as to improve the toughness of center portion and intensity
Element, Mn are solid-solution in ferrite, and solution strengthening effect is played to steel.With the increase of Mn contents, due to hindering grain boundary ferrite
Forming core, grain boundary ferrite are tapered, and coarse grain zone toughness is improved.But Mn too high levels, coarse grain zone form substantial amounts of crisp
Property tissue M-A islands, cause coarse grain zone low-temperature flexibility to deteriorate again, thus the present invention using above-mentioned content Mn elements, Neng Goubao
When card center portion there are enough wilfulnesses and intensity, grain refinement is not impacted.
Wherein, the present invention adds Nb elements on the basis of Mn elements, can form NbC in steel, NbN compounds,
In recrystallization process, because of NbC, NbN is to anchoring of dislocation and prevents sub boundary migration from greatly prolonging the recrystallization time, and
Nb prevents austenite reversion, the effect of recrystallization most strong, so as to play a part of crystal grain thinning, the steel that strengthens to obtain it is strong
Degree.
It is another object of the present invention to provide a kind of preparation method of above-mentioned bent-tube boiler muffler, described method bag
Include following steps：
Melting：Molten steel is hung into ladle refining furnace after the Steel material for preparing bend pipe addition converter is melted to be refined, gone out
After stove, carry out pouring into a mould to obtain steel；
Heat treatment：Bend pipe base is obtained after obtained steel are carried out into solution treatment, Ageing Treatment, QPQ Quench-Polish-Quench technologies
Part；
Post processing：Bend pipe finished product is obtained after bead, the processing of cold school are carried out to bend pipe blank；
Connection：Bent-tube boiler muffler is obtained after obtained bend pipe and flange, shell are attached.
In the preparation method of above-mentioned bent-tube boiler muffler, the temperature of the solution treatment is 950-980 DEG C, solution treatment
Time be 50-55min, air cooling is used after terminating.The purpose of solution treatment is to make steel recrystallization softening, is generally heated to steel
950-980 DEG C, alloying element and carbon is set all to dissolve in austenite to give full play to their effect.Solid solubility temperature can neither be too
Height, can not be too low.It is too high, draw and easily play the reduction of Ms points, δ-ferrite content increases, and is allowed to remain when being cooled to room temperature after being dissolved
Ovshinsky scale of construction increases, and causes the intensity decreases of steel；Too low then uneven microstructure.The present invention is used at the solid solution of said temperature scope
Temperature and time is managed, can guarantee that obtained steel strength height and even tissue.
In the preparation method of above-mentioned bent-tube boiler muffler, the temperature of the Ageing Treatment is 500-530 DEG C, Ageing Treatment
Time be 4.5-5h.The purpose of Ageing Treatment is to produce tiny and Dispersed precipitate precipitated phase, i.e. metal using timeliness effect
Between compound precipitation strength, to obtain good mechanical performance.
In above-mentioned bent-tube boiler muffler, the QPQ Quench-Polish-Quench technologies comprise the following steps：
Preheating：Preheating temperature is 300-320 DEG C, time 30-50min；
Nitridation：Nitriding temperature is 500-510 DEG C, nitridation time 150-180min；
Oxidation：Oxidizing temperature is 380-390 DEG C, oxidization time 15-20min.
The present invention uses QPQ salt bath compound process, and metal material can be made to be sent out at the working temperature with salt bath liquid
Raw reaction, one layer of fine and close compound layer best in quality can be formed in metal surface.The compound is completely by ε nitrided iron groups
Into can efficiently improve the hardness of metal surface, compactness, so that metal surface possesses good anti-wear performance.Meanwhile
The steel that can also make to obtain have excellent corrosion resistance, fatigue durability and deform the premium properties such as small.
Preferably, the steel include as follows before QPQ Quench-Polish-Quench technologies are carried out by pretreatment, the pretreatment
Step：Steel are polished with the SiC sand paper of the mesh of 320 mesh -340, then use Cr2O is polished, after being cleaned with absolute ethyl alcohol in ultrasonic wave
Drying.
In above-mentioned bent-tube boiler muffler, the main function of preheating is the moisture for drying workpiece surface, after workpiece is heated up
Nitriding furnace is entered back into, the moisture for preventing from adhering on workpiece causes salt bath sputtering injury operating personnel after entering nitriding furnace, and prevents
The relatively low workpiece of temperature makes nitridation furnace temperature reduce too much after entering stove.In addition, preheating has necessarily to the product quality after QPQ processing
Influence.The appropriate preheating of temperature and time can reduce workpiece deformation, and obtain the outward appearance of uniform color.
In addition, nitridation is the core process of QPQ Quench-Polish-Quench technology technologies.Because the cyanate radical decomposition in nitridation salt bath can
To produce activated nitrogen atom, metal surface is penetrated into, and the compound with excellent abrasive resistance and corrosion stability is formed in metal surface
Layer and the diffusion layer that anti-fatigue performance can be improved.The composition and weight fraction of the nitridation salt used in nitrogen treatment of the present invention
For：KCNO：50-55%, NaCO3：10-15%, K2CO3：10-15%, NaCNO：5-10%, Ce2(CO3)2：3-5%, CO
(NH2)：3-5%.
In trumpet type silencer of the present invention, the main function aoxidized in QPQ Quench-Polish-Quench technologies can make workpiece attached after nitrogenizing
Cyanogen root (CN-) in the nitridation salt thoroughly is decomposed, it is possible to reduce environmental pollution；Simultaneously workpiece surface formed one layer it is fine and close
Fe3O4Film, increase metallic surface corrosion stability.In addition, oxidation also has certain benefit to reducing coefficient of friction.
In the preparation method of above-mentioned bent-tube boiler muffler, the shot peening strength of the bead is 0.3-0.5mmA, spray
Ball medium is cast steel ball, and shot-peening coverage rate is 200%.After processing, due to the percussion of bullet, material surface occurs plasticity and become
Shape, in the range of certain depth, hardness is improved.
Compared with prior art, the invention has the advantages that：
1st, the present invention uses the rational steel of compatibility, and using solution treatment, Ageing Treatment, QPQ Quench-Polish-Quench technologies etc.
Method, it can make obtained bend pipe that there is high intensity, so as to increase the intensity of bent-tube boiler muffler；
2nd, the present invention uses high chrome, and Mn, Nb element are added in steel, can make obtained steel strength increase；
3rd, main body bend pipe uses special steel in bent-tube boiler muffler of the present invention, and configures rational preparation method, makes
Obtained bent-tube boiler muffler intensity is high, function admirable.
Embodiment
Embodiment 1
Melting：Molten steel is hung into ladle refining furnace after the Steel material for preparing bend pipe addition converter is melted to be refined, gone out
After stove, carry out pouring into a mould to obtain steel, wherein, the composition of steel is C：0.1%, Si：0.5%, Mn：3%, Cr：20%, Nb：
0.2%, remaining is Fe and inevitable impurity element；
Heat treatment：Bend pipe base is obtained after obtained steel are carried out into solution treatment, Ageing Treatment, QPQ Quench-Polish-Quench technologies
Part, wherein, the temperature of solution treatment is 950 DEG C, and the time of solution treatment is 50min, and air cooling is used after terminating, Ageing Treatment
Temperature is 500 DEG C, and the time of Ageing Treatment is 4.5h, and QPQ Quench-Polish-Quench technologies comprise the following steps：By steel with 320 mesh mesh
SiC sand paper polish, then use Cr2O is polished, and is dried up after being cleaned with absolute ethyl alcohol in ultrasonic wave, is preheated：Preheating temperature is 300
DEG C, time 30min；Nitridation：Nitriding temperature is 500 DEG C, nitridation time 150min；Oxidation：Oxidizing temperature is 380 DEG C, oxygen
The change time is 15min；The composition and weight fraction of the nitridation salt used in nitrogen treatment for：KCNO：50%, NaCO3：10%,
K2CO3：10%, NaCNO：5%, Ce2(CO3)2：3%, CO (NH2)：3%.
Post processing：Bend pipe finished product is obtained after bead, the processing of cold school are carried out to bend pipe blank；
Connection：Bent-tube boiler muffler is obtained after obtained bend pipe and flange, shell are attached.
Embodiment 2
Melting：Molten steel is hung into ladle refining furnace after the Steel material for preparing bend pipe addition converter is melted to be refined, gone out
After stove, carry out pouring into a mould to obtain steel, wherein, the composition of steel is：C：0.11%, Si：0.6%, Mn：3.4%, Cr：20.4%,
Nb：0.4%, remaining is Fe and inevitable impurity element；
Heat treatment：Bend pipe base is obtained after obtained steel are carried out into solution treatment, Ageing Treatment, QPQ Quench-Polish-Quench technologies
Part, wherein, the temperature of solution treatment is 956 DEG C, and the time of solution treatment is 51min, and air cooling is used after terminating, Ageing Treatment
Temperature is 506 DEG C, and the time of Ageing Treatment is 4.6h, and QPQ Quench-Polish-Quench technologies comprise the following steps：By steel with 324 mesh mesh
SiC sand paper polish, then use Cr2O is polished, and is dried up after being cleaned with absolute ethyl alcohol in ultrasonic wave, is preheated：Preheating temperature is 304
DEG C, time 34min；Nitridation：Nitriding temperature is 502 DEG C, nitridation time 156min；Oxidation：Oxidizing temperature is 382 DEG C, oxygen
The change time is 16min；The composition and weight fraction of the nitridation salt used in nitrogen treatment for：KCNO：51%, NaCO3：11%,
K2CO3：11%, NaCNO：6%, Ce2(CO3)2：3.4%, CO (NH2)：3.4%.
Post processing：Bend pipe finished product is obtained after bead, the processing of cold school are carried out to bend pipe blank；
Connection：Bent-tube boiler muffler is obtained after obtained bend pipe and flange, shell are attached.
Embodiment 3
Melting：Molten steel is hung into ladle refining furnace after the Steel material for preparing bend pipe addition converter is melted to be refined, gone out
After stove, carry out pouring into a mould to obtain steel, wherein, the composition of steel is：C：0.12%, Si：0.75%, Mn：4%, Cr：21%, Nb：
0.6%, remaining is Fe and inevitable impurity element；
Heat treatment：Bend pipe base is obtained after obtained steel are carried out into solution treatment, Ageing Treatment, QPQ Quench-Polish-Quench technologies
Part, wherein, the temperature of solution treatment is 965 DEG C, and the time of solution treatment is 52min, and air cooling is used after terminating, Ageing Treatment
Temperature is 515 DEG C, and the time of Ageing Treatment is 4.7h, and QPQ Quench-Polish-Quench technologies comprise the following steps：By steel with 330 purposes
SiC sand paper polishes, then uses Cr2O is polished, and is dried up after being cleaned with absolute ethyl alcohol in ultrasonic wave, is preheated：Preheating temperature is 310 DEG C,
Time is 40min；Nitridation：Nitriding temperature is 505 DEG C, nitridation time 165min；Oxidation：Oxidizing temperature is 385 DEG C, during oxidation
Between be 17min；The composition and weight fraction of the nitridation salt used in nitrogen treatment for：KCNO：53%, NaCO3：13%, K2CO3：
12%, NaCNO：7%, Ce2(CO3)2：4%, CO (NH2)：4%.
Post processing：Bend pipe finished product is obtained after bead, the processing of cold school are carried out to bend pipe blank；
Connection：Bent-tube boiler muffler is obtained after obtained bend pipe and flange, shell are attached.
Embodiment 4
Melting：Molten steel is hung into ladle refining furnace after the Steel material for preparing bend pipe addition converter is melted to be refined, gone out
After stove, carry out pouring into a mould to obtain steel, wherein, the composition of steel is：C：0.13%, Si：0.9%, Mn：4.5%, Cr：21.5%,
Nb：0.9%, remaining is Fe and inevitable impurity element；
Heat treatment：Bend pipe base is obtained after obtained steel are carried out into solution treatment, Ageing Treatment, QPQ Quench-Polish-Quench technologies
Part, wherein, the temperature of solution treatment is 972 DEG C, and the time of solution treatment is 54min, and air cooling is used after terminating, Ageing Treatment
Temperature is 521 DEG C, and the time of Ageing Treatment is 4.8h, and QPQ Quench-Polish-Quench technologies comprise the following steps：By steel with 335 purposes
SiC sand paper polishes, then uses Cr2O is polished, and is dried up after being cleaned with absolute ethyl alcohol in ultrasonic wave, is preheated：Preheating temperature is 315 DEG C,
Time is 45min；Nitridation：Nitriding temperature is 507 DEG C, nitridation time 172min；Oxidation：Oxidizing temperature is 388 DEG C, during oxidation
Between be 19min；The composition and weight fraction of the nitridation salt used in nitrogen treatment for：KCNO：54%, NaCO3：14%, K2CO3：
14%, NaCNO：8%, Ce2(CO3)2：4.5%, CO (NH2)：4.5%.
Post processing：Bend pipe finished product is obtained after bead, the processing of cold school are carried out to bend pipe blank；
Connection：Bent-tube boiler muffler is obtained after obtained bend pipe and flange, shell are attached.
Embodiment 5
Melting：Molten steel is hung into ladle refining furnace after the Steel material for preparing bend pipe addition converter is melted to be refined, gone out
After stove, carry out pouring into a mould to obtain steel, wherein, the composition of steel is：C：0.14%, Si：1.0%, Mn：5%, Cr：22%, Nb：
1.0%, remaining is Fe and inevitable impurity element；
Heat treatment：Bend pipe base is obtained after obtained steel are carried out into solution treatment, Ageing Treatment, QPQ Quench-Polish-Quench technologies
Part, wherein, the temperature of solution treatment is 980 DEG C, and the time of solution treatment is 55min, and air cooling is used after terminating, Ageing Treatment
Temperature is 530 DEG C, and the time of Ageing Treatment is 5h, and QPQ Quench-Polish-Quench technologies comprise the following steps：SiC by steel with 340 mesh
Sand paper polishes, then uses Cr2O is polished, and is dried up after being cleaned with absolute ethyl alcohol in ultrasonic wave, is preheated：Preheating temperature is 320 DEG C, when
Between be 50min；Nitridation：Nitriding temperature is 510 DEG C, nitridation time 180min；Oxidation：Oxidizing temperature is 390 DEG C, oxidization time
For 20min；The composition and weight fraction of the nitridation salt used in nitrogen treatment for：KCNO：55%, NaCO3：15%, K2CO3：
15%, NaCNO：10%, Ce2(CO3)2：5%, CO (NH2)：5%.
Post processing：Bend pipe finished product is obtained after bead, the processing of cold school are carried out to bend pipe blank；
Connection：Bent-tube boiler muffler is obtained after obtained bend pipe and flange, shell are attached.
Comparative example 1
With differing only in for embodiment 1, Nb elements are not contained in bent-tube boiler muffler in the comparative example, other and implementation
Example 1 is identical, and here is omitted.
Comparative example 2
With differing only in for embodiment 1, solution treatment is not used in the comparative example bent-tube boiler muffler, other and implementation
Example 1 is identical, and here is omitted.
Comparative example 3
With differing only in for embodiment 1, Ageing Treatment is not used in the comparative example bent-tube boiler muffler, other and implementation
Example 1 is identical, and here is omitted.
Comparative example 4
With differing only in for embodiment 1, QPQ Quench-Polish-Quench technologies are not used in the comparative example bent-tube boiler muffler, its
He is same as Example 1, and here is omitted.
Comparative example 5
With differing only in for embodiment 1, QPQ Quench-Polish-Quench technologies use common nitrogen in the comparative example bent-tube boiler muffler
Salt dissolving, other are same as Example 1, and here is omitted.
Bent-tube boiler muffler in embodiment 1-5 and comparative example 1-5 is subjected to performance test, test result is as shown in table 1.
Table 1：Embodiment 1-5 and comparative example 1-5 in bent-tube boiler muffler performance test result
It follows that bent-tube boiler muffler of the present invention uses the rational steel of compatibility, and at use solution treatment, timeliness
The methods of reason, QPQ Quench-Polish-Quench technologies, it can make obtained bend pipe that there is high intensity, so as to increase the intensity of bent-tube boiler muffler.
Specific embodiment described herein is only to spirit explanation for example of the invention.Technology belonging to the present invention is led
The technical staff in domain can be made various modifications or supplement to described specific embodiment or be substituted using similar mode, but simultaneously
Do not deviate by the spirit of the present invention or surmount scope defined in appended claims.
It is skilled to this area although having been made a detailed description to the present invention and being cited some specific embodiments
For technical staff, as long as it is obvious that can make various changes or correct without departing from the spirit and scope of the present invention.
Claims (8)
1. bent-tube boiler muffler, it is characterised in that the bent-tube boiler muffler includes bend pipe, housing and flange, the bend pipe by
Stainless steel material is made, and the stainless steel material includes the composition of following mass percent：C：0.1-0.14%, Si：0.5-
1.0%, Mn：3-5%, Cr：20-22%, Nb：0.2-1.0%, remaining is Fe and inevitable impurity element.
2. bent-tube boiler muffler according to claim 1, it is characterised in that the preparation method bag of the bent-tube boiler muffler
Include following steps：
Melting：Molten steel is hung into ladle refining furnace after the Steel material for preparing bend pipe addition converter is melted to be refined, after coming out of the stove,
Carry out pouring into a mould to obtain steel；
Heat treatment：Bend pipe blank is obtained after obtained steel are carried out into solution treatment, Ageing Treatment, QPQ Quench-Polish-Quench technologies；
Post processing：Bend pipe finished product is obtained after bead is carried out to bend pipe blank；
Connection：Bent-tube boiler muffler is obtained after obtained bend pipe and flange, shell are attached.
3. bent-tube boiler muffler according to claim 2, it is characterised in that the temperature of the solution treatment is 950-980
DEG C, the time of solution treatment is 50-55min, and air cooling is used after terminating.
4. bent-tube boiler muffler according to claim 2, it is characterised in that the temperature of the Ageing Treatment is 500-530
DEG C, the time of Ageing Treatment is 4.5-5h.
5. bent-tube boiler muffler according to claim 2, it is characterised in that the QPQ Quench-Polish-Quench technologies include as follows
Step：
Preheating：Preheating temperature is 300-320 DEG C, time 30-50min；
Nitridation：Nitriding temperature is 500-510 DEG C, nitridation time 150-180min；
Oxidation：Oxidizing temperature is 380-390 DEG C, oxidization time 15-20min.
6. bent-tube boiler muffler according to claim 5, it is characterised in that the steel are carrying out the compound place of QPQ salt baths
Comprise the following steps before reason by pretreatment, the pretreatment：Steel are polished with the SiC sand paper of the mesh of 320 mesh -340, then used
Cr2O is polished, and is dried up after being cleaned with absolute ethyl alcohol in ultrasonic wave.
7. bent-tube boiler muffler according to claim 5, it is characterised in that it is described nitridation process in nitridation salt composition and
Weight fraction is：KCNO：50-55%, NaCO3：10-15%, K2CO3：10-15%, NaCNO：5-10%, Ce2(CO3)2：3-
5%, CO (NH2)：3-5%.
8. bent-tube boiler muffler according to claim 2, it is characterised in that the shot peening strength of the bead is 0.3-
0.5mmA, blasting media are cast steel ball, and shot-peening coverage rate is 200%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710727474.XA CN107675099A (en) | 2017-08-23 | 2017-08-23 | Bent-tube boiler muffler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710727474.XA CN107675099A (en) | 2017-08-23 | 2017-08-23 | Bent-tube boiler muffler |
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| Publication Number | Publication Date |
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| CN107675099A true CN107675099A (en) | 2018-02-09 |
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ID=61134832
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| CN201710727474.XA Pending CN107675099A (en) | 2017-08-23 | 2017-08-23 | Bent-tube boiler muffler |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103370436A (en) * | 2011-02-14 | 2013-10-23 | 新日铁住金株式会社 | Duplex stainless steel, and process for production thereof |
| CN103966523A (en) * | 2014-05-12 | 2014-08-06 | 福州大学 | Quench-polish-quench (QPQ) treatment method for super duplex stainless cast steel |
| JP2016079482A (en) * | 2014-10-20 | 2016-05-16 | 新日鐵住金株式会社 | Dual phase stainless steel and manufacturing method therefor |
| JP2016166385A (en) * | 2015-03-09 | 2016-09-15 | 新日鐵住金株式会社 | Stainless steel for surface modified spring and production method therefor |
| CN107002189A (en) * | 2014-11-05 | 2017-08-01 | 日新制钢株式会社 | Spread engagement stainless steel material |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103370436A (en) * | 2011-02-14 | 2013-10-23 | 新日铁住金株式会社 | Duplex stainless steel, and process for production thereof |
| CN103966523A (en) * | 2014-05-12 | 2014-08-06 | 福州大学 | Quench-polish-quench (QPQ) treatment method for super duplex stainless cast steel |
| JP2016079482A (en) * | 2014-10-20 | 2016-05-16 | 新日鐵住金株式会社 | Dual phase stainless steel and manufacturing method therefor |
| CN107002189A (en) * | 2014-11-05 | 2017-08-01 | 日新制钢株式会社 | Spread engagement stainless steel material |
| JP2016166385A (en) * | 2015-03-09 | 2016-09-15 | 新日鐵住金株式会社 | Stainless steel for surface modified spring and production method therefor |
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