CN104593688B - A kind of bite-resistant friction pair and preparation method thereof for boiler feed pump - Google Patents
A kind of bite-resistant friction pair and preparation method thereof for boiler feed pump Download PDFInfo
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- CN104593688B CN104593688B CN201510019714.1A CN201510019714A CN104593688B CN 104593688 B CN104593688 B CN 104593688B CN 201510019714 A CN201510019714 A CN 201510019714A CN 104593688 B CN104593688 B CN 104593688B
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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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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- 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
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- 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
- B23P15/006—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass turbine wheels
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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
- C22C38/40—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
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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
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
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Abstract
The present invention discloses a kind of boiler feed pump bite-resistant friction pair and preparation method thereof, the following ingredients of impeller material selection mass percent composition: C:0.12-0.15, Si:0.3-0.8, Mn:0.3-0.6, S :≤0.025, P :≤0.035, Cr:12-13.5, Ni:0.5-1.5, all the other are Fe. Sealing ring material selection forging, the following ingredients being formed by mass percent: C:0.12-0.15, Si:0.3-0.8, Mn:0.3-0.6, S:0.25-0.32, P :≤0.035, Cr:12-14, Ni :≤0.35, Mo:0.3-0.6, all the other are Fe. In the time of boiler feedwater pump operation, impeller High Rotation Speed. Adopt friction pair of the present invention, can meet the mechanical performance requirement of boiler feed pump, reduce the probability that sealing ring and impeller interlock locking occur, ensure that feed pump operates steadily, reduce the cost of safeguarding.
Description
Technical field
The invention belongs to metal material technical field, be specifically related to a kind of boiler feed pump bite-resistant friction pair and system thereofPreparation Method.
Background technology
The impeller of boiler feed pump rotor part and the sealing ring of stator component, design gaps is 0.35 ~ 0.55mm, impellerRotating speed is within the scope of 3000-6000r/min. In feed pump running, if assembly precision is not high or medium in exist assortedMatter (as the metal such as smear metal, welding slag or non-metallic particle), impeller just likely contacts with sealing ring, produces friction, and then causesInterlock locking.
At present, the conventional material of impeller and sealing ring is respectively ZG2Cr13, ZG1Cr13MoS, at the running of feed pumpIn, this friction pair also there will be the situation of interlock locking. Join in secondary scheme various, the problem of most critical is friction pair materialComposition, technique, this is the inventive point place of material. Because the friction pair of heterogeneity, technique has different characteristics and function.
Summary of the invention
The object of the invention is to overcome the deficiency of current material and provide a kind of New-type boiler feed pump bite-resistant to rubAuxiliary material and preparation method thereof.
In order to achieve the above object, the present invention adopts following technical scheme:
A kind of boiler feed pump bite-resistant friction pair, impeller material is grouped into by each one-tenth of following mass percent: C0.12-0.15, Si0.3-0.8, Mn0.3-0.6, S≤0.025, P≤0.035, Cr12-13.5, Ni0.5-1.5, itsRemaining is Fe; Sealing ring material is grouped into by each one-tenth of following mass percent: C0.12-0.15, Si0.3-0.8, Mn0.3-0.6, S0.25-0.32, P≤0.035, Cr12-14, Ni≤0.35, Mo0.3-0.6, all the other are Fe.
A preparation method for bite-resistant friction pair for boiler feed pump, adopts wax-pattern hot investment casting, comprises the following steps:
Step 1 is proportionally placed in intermediate frequency furnace by raw material and carries out melting, and tapping casting afterwards, then moves backFire, annealing temperature is 890-910 DEG C, insulation 4-4.5h;
Then step 2 carries out roughing, carries out afterwards modifier treatment, and hardening heat is 1035-1045 DEG C, insulation 1.5-2h, oil cooling is to room temperature, and temperature is 660-670 DEG C, insulation 3-4h, oil cooling is to room temperature;
The last fine finishining of step 3;
Forged sealing ring adopts round steel strand to forge, and comprises the following steps:
Step 1 intercepts corresponding size blank on round steel, heats forged, and initial forging temperature is 1180-1185 DEG C, finish-forging temperatureDegree, for 890-900 DEG C, is then annealed, and annealing temperature is 890-910 DEG C, insulation 2.5-3h;
Then step 2 carries out roughing, carries out afterwards modifier treatment, and hardening heat is 995-1005 DEG C, insulation 1-1.5h, oil cooling is to room temperature, and temperature 500-520 DEG C, is incubated 3-4h, and air cooling is to room temperature;
The last fine finishining of step 3;
Described impeller heat treatment hardness is controlled at HB210 ~ 260, and sealing ring heat treatment hardness is controlled at HB360 ~ 400.
In order to improve friction pair bite-resistant performance, meet the requirement of mechanical strength of material, the control of impeller heat treatment hardness simultaneouslyBuilt in HB210 ~ 260; Sealing ring changes forging into by foundry goods, and material structure is finer and close evenly, and heat treatment hardness is controlled at HB360 ~ 400. Impeller material C content is controlled at above-mentioned zone, can ensure that impeller has enough intensity after modified, adds certainThe Ni of amount, can stable austenite phase region, strengthens the corrosion resistance of impeller. Sealing ring material C content is controlled at above-mentioned zone,Ensure that sealing ring has enough intensity after modified, add S and Mo, make it to form molybdenum sulfide, in parts operation process, produceSelf-lubricating. Impeller is selected foundry goods, and sealing ring is selected forging, has increased the histological difference of friction pair two parts, can improve frictionSecondary bite-resistant performance. In improving friction pair integral hardness, ensure the difference of hardness of bi-material, can effectively improveFriction pair bite-resistant performance. The present invention can meet the mechanical performance requirement of boiler feed pump, reduces impeller and sealing ring simultaneouslyThe probability that interlock locking occurs, ensures feed pump even running, can extend the service life of product, reduces the one-tenth of plant maintenanceThis. The present invention has selected a pair of stainless steel friction pair, reasonably optimizing alloy proportion and Technology for Heating Processing, improved bi-materialWhen difference of hardness, ensure the mechanical strength of material, reduced the probability that impeller and sealing ring interlock locking occur.
Detailed description of the invention
Embodiment 1
A kind of boiler feed pump bite-resistant friction pair, impeller material is grouped into by each one-tenth of following mass percent: C0.12-0.15, Si0.3-0.8, Mn0.3-0.6, S≤0.025, P≤0.035, Cr12-13.5, Ni0.5-1.5, itsRemaining is Fe; Sealing ring is grouped into by each one-tenth of following mass percent: C0.12-0.15, Si0.3-0.8, Mn0.3-0.6, S0.25-0.32, P≤0.035, Cr12-14, Ni≤0.35, Mo0.3-0.6, all the other are Fe.
A preparation method for bite-resistant friction pair for boiler feed pump, impeller adopts wax-pattern hot investment casting, comprises followingStep:
Step 1 is proportionally placed in intermediate frequency furnace by raw material and carries out melting, and tapping casting afterwards, then moves backFire, annealing temperature is 890-910 DEG C, insulation 4-4.5h;
Then step 2 carries out roughing, carries out afterwards modifier treatment, and hardening heat is 1035-1045 DEG C, insulation 1.5-2h, oil cooling is to room temperature, and temperature is 660-670 DEG C, insulation 3-4h, oil cooling is to room temperature;
The last fine finishining of step 3;
Forged sealing ring adopts round steel strand to forge, and comprises the following steps:
Step 1 intercepts corresponding size blank on round steel, heats forged, and initial forging temperature is 1180-1185 DEG C, finish-forging temperatureDegree, for 890-900 DEG C, is then annealed, and annealing temperature is 890-910 DEG C, insulation 2.5-3h;
Then step 2 carries out roughing, carries out afterwards modifier treatment, and hardening heat is 995-1005 DEG C, insulation 1-1.5h, oil cooling is to room temperature, and temperature 500-520 DEG C, is incubated 3-4h, and air cooling is to room temperature;
The last fine finishining of step 3;
Described impeller heat treatment hardness is controlled at HB210 ~ 260, and sealing ring heat treatment hardness is controlled at HB360 ~ 400.
Embodiment 2
A kind of boiler feed pump bite-resistant friction pair, impeller material selection, composition is by forming below: C:0.12kg, Si:0.3kg, Mn:0.3kg, S0.025kg, P0.035kg, Cr13.5kg, Ni:0.5kg, Fe85.2kg. Sealing ring materialMatter is selected forging, and composition is by forming below: C:0.13kg, and Si:0.5kg, Mn:0.5kg, S:0.28kg, P:0.035kg,Cr：13kg，Ni：0.35kg，Mo：0.5kg，Fe84.7kg。
A preparation method for bite-resistant friction pair for boiler feed pump, impeller adopts wax-pattern hot investment casting, comprises followingStep:
Step 1 is proportionally placed in intermediate frequency furnace by raw material and carries out melting, and tapping casting afterwards, then moves backFire, annealing temperature is 910 DEG C, insulation 4.5h;
Then step 2 carries out roughing, carries out afterwards modifier treatment, and hardening heat is 1045 DEG C, insulation 1.5h, oil coolingTo room temperature, temperature is 660 DEG C, insulation 3h, and oil cooling is to room temperature;
The last fine finishining of step 3;
Forging 1Cr13MoS sealing ring adopts round steel strand to forge, and comprises the following steps:
Step 1 intercepts corresponding size blank on round steel, heats forged, and initial forging temperature is 1180 DEG C, final forging temperature is900 DEG C, then to anneal, annealing temperature is 910 DEG C, insulation 3h,
Then step 2 carries out roughing, carries out afterwards modifier treatment, and hardening heat is 1005 DEG C, insulation 1.5h, oilCold, 520 DEG C of temperatures, insulation 4h, air cooling is to room temperature;
The last fine finishining of step 3.
Described impeller heat treatment hardness HB260, sealing ring heat treatment hardness HB360, coefficient of friction 0.4758.
Embodiment 3
A kind of boiler feed pump bite-resistant friction pair, impeller material selection, comprises following ingredients: C:0.15Kg, Si:0.8Kg, Mn:0.6Kg, S:0.02Kg, P:0.03Kg, Cr:13Kg, Ni:1Kg, Fe84.4Kg. The choosing of sealing ring materialWith forging, comprise following ingredients: C:0.15Kg, Si:0.4Kg, Mn:0.5Kg, S:0.3Kg, P:0.025Kg, Cr:14Kg，Ni：0.25Kg，Mo：0.4Kg，Fe84Kg。
A preparation method for bite-resistant friction pair for boiler feed pump, impeller adopts wax-pattern hot investment casting, comprises followingStep:
Step 1 is proportionally placed in intermediate frequency furnace by raw material and carries out melting, and tapping casting afterwards, then moves backFire, annealing temperature is 900 DEG C, insulation 4.5h;
Then step 2 carries out roughing, carries out afterwards modifier treatment, and hardening heat is 1030 DEG C, insulation 2h, and oil cooling is extremelyRoom temperature, temperature is 670 DEG C, insulation 3.5h, oil cooling is to room temperature;
The last fine finishining of step 3;
Forged sealing ring adopts round steel strand to forge, and comprises the following steps:
Step 1 intercepts corresponding size blank on round steel, heats forged, and initial forging temperature is 1182 DEG C, final forging temperature is895 DEG C, then to anneal, annealing temperature is 895 DEG C, insulation 3h,
Then step 2 carries out roughing, carries out afterwards modifier treatment, and hardening heat is 1000 DEG C, insulation 1.2h, oil coolingTo room temperature, 505 DEG C of temperatures, insulation 3.4h, air cooling is to room temperature;
The last fine finishining of step 3;
Described impeller heat treatment hardness is at HB210, and sealing ring heat treatment hardness is at HB400, coefficient of friction 0.4759.
Embodiment 4
A kind of boiler feed pump bite-resistant friction pair, impeller material selection, comprises the following ingredients being made up of quality: C:0.13Kg，Si：0.5Kg，Mn：0.4Kg，S：0.019Kg，P：0.025Kg，Cr：12.5Kg，Ni：1.3Kg，Fe85.1Kg. Sealing ring material selection forging, comprises the following ingredients that quality forms: C:0.13Kg, Si:0.7Kg, and Mn:0.4Kg, S:0.31Kg，P：0.034Kg，Cr：13.5Kg，Ni：0.33Kg，Mo：0.35Kg，Fe84.2Kg。
A preparation method for bite-resistant friction pair for boiler feed pump, impeller adopts wax-pattern hot investment casting, comprises followingStep:
Step 1 is proportionally placed in intermediate frequency furnace by raw material and carries out melting, and tapping casting afterwards, then moves backFire, annealing temperature is 905 DEG C, insulation 4.1h;
Then step 2 carries out roughing, carries out afterwards modifier treatment, and hardening heat is 1038 DEG C, insulation 1.8h, oil coolingTo room temperature, temperature is 669 DEG C, insulation 3.7h, and oil cooling is to room temperature;
The last fine finishining of step 3;
Forging 1Cr13MoS sealing ring adopts round steel strand to forge, and comprises the following steps:
Step 1 intercepts corresponding size blank on round steel, heats forged, and initial forging temperature is 1181 DEG C, final forging temperature is899 DEG C, then to anneal, annealing temperature is 907 DEG C, insulation 2.6h;
Then step 2 carries out roughing, carries out afterwards modifier treatment, and hardening heat is 999 DEG C, insulation 1.3h, oil coolingTo room temperature, 507 DEG C of temperatures, insulation 3.4h, air cooling is to room temperature;
The last fine finishining of step 3;
Described impeller heat treatment hardness is controlled at HB230, and sealing ring heat treatment hardness is controlled at HB380, coefficient of friction0.4752。
Embodiment 5
A kind of boiler feed pump bite-resistant friction pair, impeller material is by the material of following quality: C:0.15Kg, Si:0.7Kg, Mn:0.4Kg, S:0.019Kg, P:0.025Kg, Cr:13.5Kg, Ni:1.5Kg, Fe83.7Kg. Sealing ring materialSelect forging constituent: C:0.14Kg, Si:0.75Kg, Mn:0.6Kg, S:0.3Kg, P:0.033Kg, Cr:12.5Kg，Ni：0.33Kg，Mo：0.5Kg，Fe84.8Kg。
A preparation method for bite-resistant friction pair for boiler feed pump, impeller adopts wax-pattern hot investment casting, comprises followingStep:
Step 1 is proportionally placed in intermediate frequency furnace by raw material and carries out melting, and tapping casting afterwards, then moves backFire, annealing temperature is 905 DEG C, insulation 4.1h;
Then step 2 carries out roughing, carries out afterwards modifier treatment, and hardening heat is 1038 DEG C, insulation 1.9h, oil coolingTo room temperature, temperature is 661 DEG C, insulation 3.3h, and oil cooling is to room temperature;
The last fine finishining of step 3;
Forged sealing ring adopts round steel strand to forge, and comprises the following steps:
Step 1 intercepts corresponding size blank on round steel, heats forged, and initial forging temperature is 1182 DEG C, final forging temperature is892 DEG C, then to anneal, annealing temperature is 898 DEG C, insulation 2.7h;
Then step 2 carries out roughing, carries out afterwards modifier treatment, and hardening heat is 998 DEG C, insulation 1.3h, oil coolingTo room temperature, 510 DEG C of temperatures, insulation 3.5h, air cooling is to room temperature;
The last fine finishining of step 3;
Described impeller heat treatment hardness is controlled at HB260, and sealing ring heat treatment hardness is controlled at HB360, coefficient of friction0.4755。
Embodiment 6
A kind of boiler feed pump bite-resistant friction pair, impeller material selection, is made up of the material of following quality: C:0.13Kg，Si：0.4Kg，Mn：0.5Kg，S：0.024Kg，P：0.033Kg，Cr：13.4Kg，Ni：0.8Kg，Fe84.7Kg. Sealing ring material selection forging, is made up of the material of following quality: C:0.13Kg, and Si:0.3Kg, Mn:0.5Kg, S:0.28Kg，P：0.03Kg，Cr：13.9Kg，Ni：0.32Kg，Mo：0.35Kg，Fe84.5Kg。
A preparation method for bite-resistant friction pair for boiler feed pump, impeller adopts wax-pattern hot investment casting, comprises followingStep:
Step 1 is proportionally placed in intermediate frequency furnace by raw material and carries out melting, and tapping casting afterwards, then moves backFire, annealing temperature is 891 DEG C, insulation 4.2h;
Then step 2 carries out roughing, carries out afterwards modifier treatment, and hardening heat is 1036 DEG C, insulation 1.6h, oil coolingTo room temperature, temperature is 669 DEG C, insulation 3.3h, and oil cooling is to room temperature;
The last fine finishining of step 3;
Forged sealing ring adopts round steel strand to forge, and comprises the following steps:
Step 1 intercepts corresponding size blank on round steel, heats forged, and initial forging temperature is 1182 DEG C, final forging temperature is892 DEG C, then to anneal, annealing temperature is 895 DEG C, insulation 2.8h;
Then step 2 carries out roughing, carries out afterwards modifier treatment, and hardening heat is 1002 DEG C, insulation 1.2h, oil coolingTo room temperature, 510 DEG C of temperatures, insulation 3.2h, air cooling is to room temperature;
The last fine finishining of step 3;
Described impeller heat treatment hardness is controlled at HB248, and sealing ring heat treatment hardness is controlled at HB369, coefficient of friction0.4757。
Embodiment 7
A kind of boiler feed pump bite-resistant friction pair, the composition of impeller material composition: C:0.15Kg, Si:0.7Kg,Mn:0.4Kg, S:0.019Kg, P0.025Kg, Cr:13.5Kg, Ni:1.5Kg, Fe83.7Kg. Sealing ring material forms intoPoint: C:0.14Kg, Si:0.75Kg, Mn:0.6Kg, S:0.3Kg, P:0.033Kg, Cr:12.5Kg, Ni:0.33Kg,Mo：0.5Kg，Fe84.8Kg。
A preparation method for bite-resistant friction pair for boiler feed pump, impeller adopts wax-pattern hot investment casting, comprises followingStep:
Step 1 is proportionally placed in intermediate frequency furnace by raw material and carries out melting, and tapping casting afterwards, then moves backFire, annealing temperature is 905 DEG C, insulation 4.4h;
Then step 2 carries out roughing, carries out afterwards modifier treatment, and hardening heat is 1039 DEG C, insulation 1.9h, oil coolingTo room temperature, temperature is 667 DEG C, insulation 3.2h, and oil cooling is to room temperature;
The last fine finishining of step 3;
Forged sealing ring adopts round steel strand to forge, and comprises the following steps:
Step 1 intercepts corresponding size blank on round steel, heats forged, and initial forging temperature is 1183 DEG C, final forging temperature is891 DEG C, then to anneal, annealing temperature is 895 DEG C, insulation 2.8h;
Then step 2 carries out roughing, carries out afterwards modifier treatment, and hardening heat is 1002 DEG C, insulation 1.3h, oil coolingTo room temperature, 510 DEG C of temperatures, insulation 3.5h, air cooling is to room temperature;
The last fine finishining of step 3;
Described impeller heat treatment hardness is controlled at HB255, and sealing ring heat treatment hardness is controlled at HB367, coefficient of friction0.4760。
In the embodiment of the present invention, impeller hardness is 210 ~ 260HB; Forged sealing ring hardness is 360 ~ 400HB. Increase frictionWhen secondary two parts difference of hardness, improve the integral hardness of friction pair. Table 1 is two groups of friction pair Wear Test Data, and group 1 isConventional friction pair, group 2 is embodiment 2 friction pairs, from coefficient of friction, this invention coefficient of friction is less, at equal operating mode barUnder part, the probability that interlock occurs is less; Friction pair damage in impeller amount increases to some extent, and seal wears amount decreases, always wearing and tearingAmount does not increase, and, in promoting friction pair bite-resistant performance, does not increase the wearing and tearing of friction pair.
Claims (2)
1. a boiler feed pump bite-resistant friction pair, is characterized in that: impeller material is by each one-tenth of following mass percentBe grouped into: C0.12-0.15, Si0.3-0.8, Mn0.3-0.6, S≤0.025, P≤0.035, Cr12-13.5, Ni0.5-1.5, all the other are Fe; Sealing ring material is grouped into by each one-tenth of following mass percent: C0.12-0.15, Si0.3-0.8, Mn0.3-0.6, S0.25-0.32, P≤0.035, Cr12-14, Ni≤0.35, Mo0.3-0.6, all the other are Fe;
Its preparation method is: impeller adopts wax-pattern hot investment casting, and step is as follows:
Step 1, is proportionally placed in intermediate frequency furnace by raw material and carries out melting, and tapping casting afterwards, then anneals,Annealing temperature is 890-910 DEG C, insulation 4-4.5h;
Step 2, then carries out roughing, carries out afterwards modifier treatment, and hardening heat is 1035-1045 DEG C, insulation 1.5-2h,Oil cooling is to room temperature, and temperature is 660-670 DEG C, insulation 3-4h, and oil cooling is to room temperature;
Step 3, fine finishining;
Forged sealing ring adopts round steel strand to forge, and step is as follows:
Step 1 intercepts corresponding size blank on round steel, heats forged, and initial forging temperature is 1180-1185 DEG C, final forging temperature is890-900 DEG C, then anneals, and annealing temperature is 890-910 DEG C, insulation 2.5-3h;
Step 2, then carries out roughing, carries out afterwards modifier treatment, and hardening heat is 995-1005 DEG C, insulation 1-1.5h,Oil cooling, temperature 500-520 DEG C, insulation 3-4h, air cooling is to room temperature;
Step 3, fine finishining.
2. boiler feed pump as claimed in claim 1 bite-resistant friction pair, is characterized in that: described impeller heat treatment hardnessBe controlled at HB210 ~ 260, sealing ring heat treatment hardness is controlled at HB360 ~ 400.
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| CN201510019714.1A CN104593688B (en) | 2015-01-15 | 2015-01-15 | A kind of bite-resistant friction pair and preparation method thereof for boiler feed pump |
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| CN111020401A (en) * | 2018-10-09 | 2020-04-17 | 中国电力科学研究院有限公司 | Stainless steel for power transmission and transformation engineering and production method thereof |
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| CN102286706B (en) * | 2011-08-04 | 2012-10-31 | 上海电力修造总厂有限公司 | Martensitic stainless steel capable of resisting occlusal wear |
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