CN103305772B - A kind of high rigidity slag stock pump pump housing and preparation method thereof - Google Patents
A kind of high rigidity slag stock pump pump housing and preparation method thereof Download PDFInfo
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- CN103305772B CN103305772B CN201310193273.8A CN201310193273A CN103305772B CN 103305772 B CN103305772 B CN 103305772B CN 201310193273 A CN201310193273 A CN 201310193273A CN 103305772 B CN103305772 B CN 103305772B
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Abstract
The invention discloses a kind of high rigidity slag stock pump pump housing and preparation method thereof, it has solved in prior art the problems such as slag stock pump pump housing hardness is inadequate. Component and the mass percent of the slag stock pump pump housing of the present invention are: carbon: 2.8%-3.3%, chromium: 26%-28%, silicon: 0.30%-0.8%, manganese: 0.5%-1.0%, nickel: 0.7%-1.2%, molybdenum: 0.15%-0.6%, zirconium: 0.025%-0.050%, copper≤0.50%, niobium≤0.020%, surplus is iron and inevitable impurity. The present invention also provides the preparation method who prepares the above-mentioned slag stock pump pump housing, and its method comprises the following steps: proportioning, casting, dead head cutting, heat treatment. The present invention also improves the structure of slag stock pump body, makes slag stock pump pump housing hardness high, good mechanical property, long service life.
Description
Technical field
The present invention relates to a kind of slag stock pump pump housing, be specifically related to a kind of high rigidity slag stock pump pumpBody and preparation method thereof, belongs to metal material field.
Background technology
Slag stock pump is a kind of centrifugal pump that is used for carrying and processing two-phase or multiphase material of solid-liquid,Be widely used in the industries such as mine, coloured, metallurgical smelting, coal, petroleum and chemical industry. SlagThe stock pump pump housing in use because of the fluid that contains solid particle in course of conveying to slag stock pumpThe wearing and tearing that generation is washed away and the fluid media (medium) transporting have the Acidity of Aikalinity in various degree can be rightSlag stock pump has corrosiveness, thereby has shortened the life cycle of the slag stock pump pump housing. Therefore slag stock pumpThe pump housing is in use except wear-resisting-cavitation-decay resistance is had to higher requirement, alsoNeed to there is higher hardness.
Chinese patent application file (publication number: CN102560232A) discloses a kind of useIn Hypoeutectic High Cr Cast Iron and the heat-treatment processing process of slag slurry pump blade, the chemistry of this cast ironComposition is by weight percentage: C:2.6～2.8%, Cr:26～32%, Si:0.5～0.7%,Mn：0.3～0.6％、Ni：0.2～0.4％、Mo：0.1～0.2％、Cu：0.02～0.04％，Its adopt cast iron is carried out in electric furnace to melting, composite inoculating processing, Shot Blasting, go shouldThe Technology for Heating Processing of power annealing, machining, quenching+tempering technique, though improved impellerImpact flexibility and wearability, but its hardness does not still reach the required hardness of the pump housing.
Summary of the invention
The object of the invention is for the deficiencies in the prior art, a kind of machinery is providedThe preparation method of the high rigidity slag stock pump pump housing that performance is good and this high rigidity slag stock pump pump housing.
Object of the present invention can realize by following technical proposal: a kind of high rigidity slag slurryThe pump pump housing, its component and mass percent are: carbon (C): 2.8%-3.3%, chromium(Cr): 26%-28%, silicon (Si): 0.30%-0.8%, manganese (Mn): 0.5%-1.0%,Nickel (Ni): 0.7%-1.2%, molybdenum (Mo): 0.15%-0.6%, zirconium (Zr): 0.025%-0.050%,Copper (Cu)≤0.50%, niobium (Nb)≤0.020%, surplus is iron (Fe) and can notThe impurity of avoiding; The mechanical performance of the described high rigidity slag stock pump pump housing is as follows: Rockwell hardness≥60HB。
Compared to prior art, the slag stock pump pump housing in the present invention has been introduced zirconium, niobium element,By the synergy of zr element and other each elements, can obtain high rigidity slag stock pump pumpBody.
In described impurity, the mass percent of sulphur (S) is less than or equal to 0.019%, phosphorus (P)Mass percent be less than or equal to 0.019%.
In the high rigidity slag stock pump pump housing of the present invention, carbon content is 2.8%-3.3%. At slag stock pumpIn the pump housing, carbon can form stable (Cr, Fe) with iron, chromium7C3Type carbide, alsoCan form carbide with Fe, Mn, and improve the hardness of the slag stock pump pump housing by quenching,Can ensure again enough plasticity, toughness and other mechanical performances simultaneously. Carbon in the present inventionCan produce synergy with other elements, make the slag stock pump pump housing there is good combination property,Especially there is higher hardness.
Chromium content in the slag stock pump pump housing of the present invention is 26%-28%. The radius of chromium atom is2.8.10-10M, and iron atom radius is 2.710-10M, both are very close, chromium and ironAffinity stronger than other elements, be easily combined formation (Cr, Fe) with carbon, iron3C and(FeCr) on a small quantity7C3Dissolve in solid solution, can strengthen matrix, the raising slag stock pump pump housingQuenching degree. If Cr content is too low, the corrosion resistance of the slag stock pump pump housing is not good. The present invention willThe mass percent of chromium element is brought up to 26%-28%, can make chromium and other elements produce associationSame-action, thus make the slag stock pump pump housing in the application there is good combination property, outstandingIt is to have higher hardness.
Element silicon is dissolved in ferrite, can strong inhibition and the carbon of alleviating overcooling austeniteCompound is decomposed, and improves stabilization of austenite. Its content coordinates with manganese element content, can haveEffect is improved the toughness of the slag stock pump pump housing, improves intensity and the hardness of the slag stock pump pump housing. Silicon existsIn the slag stock pump pump housing, also can change morphology of carbides, in the time that silicone content is lower, as w (Si)=0.3%, carbide is often faller gill shape, but in the time that the mass fraction of silicon is increased to 0.8%,It is block that carbide is. Therefore this slag stock pump pump housing is strictly controlled the mass percent of siliconAt 0.30-0.80%, make the slag stock pump pump housing in the present invention there is good combination property.Even if otherwise the oxidation resistance of the slag stock pump pump housing in use increases very easilyThere is larger-size massive carbide, thus the mechanical property of the infringement slag stock pump pump housing.
Manganese is main intensified element in the slag stock pump pump housing, in the slag stock pump pump housing, mainly risesThe effects such as deoxidation degasification and raising quenching degree. Manganese can generate with iron in the slag stock pump pump housing(FeMn)3C type carbide, reduces austenite decomposition speed, thereby greatly improves slagThe quenching degree of the stock pump pump housing. Manganese in the slag stock pump pump housing its content of deoxidation must 0.5% withUpper, if but manganese too high levels, manganese is dissolved in austenite entering by reduction martensite transformation temperatureThereby and being increased, the Ovshinsky scale of construction remaining in quenching structure affects the wear-resisting of the slag stock pump pump housingProperty. Ensureing that under the prerequisite of austenite structure, the reduction of manganese content can cause austenite steadyQualitative slightly decline, but the workhardness of the slag stock pump pump housing can significantly strengthen. At slag stock pumpIn the pump housing, adding manganese element also can refinement material structure, improves recrystallization temperature, thereby increasesHeat resistance when the strong slag stock pump pump housing in use produces high temperature because of friction. Therefore originallyManganese content is controlled at 0.5%-1.0% by invention, both ensured austenite structure, increases againAustenitic hardness and intensity.
Nickel can reduce austenite decomposition speed in the slag stock pump pump housing, greatly improves slag slurryThe quenching degree of the pump pump housing, also can increase substantially intensity and the toughness of the slag stock pump pump housing. NickelWith the acting in conjunction of the element such as chromium, molybdenum, can obviously improve the hardness of the slag stock pump pump housing. But nickelBe more rare resource, should under the prerequisite that ensures slag stock pump pump housing performance, reduce it as far as possibleContent, therefore the nickel content in the slag stock pump pump housing of the present invention is 0.7%-1.2%.
The molybdenum element of crystal grain thinning is added in this slag stock pump pump housing, can play three aspects: effect:One, molybdenum can suppress cementite gathering effectively, causes the carbide of molybdenum with superfine little chiVery little disperse is distributed in austenite, simultaneously can dispersion-strengthened action, and strengthening austenite structure,Intensity and the hardness of the slag stock pump pump housing are increased, and strain-hardening performance strengthens. Two, molybdenum dividesCloth can effectively suppress analysing of grain boundary carbide in slag stock pump pump housing cooling procedure in carbideGo out, in the slag stock pump pump housing, chromatize can make grain boundary carbide separate out tendency greatly to improve, molybdenum withThe compound interpolation of two kinds of elements of chromium can make the beneficial effect of two kinds of alloying elements give play to simultaneouslyCome. Three, in the slag stock pump pump housing, add after molybdenum, acicular carbide shortens, and quantity obviously subtractsFew, Precipitation Temperature improves, and can make the brittle temperature of the slag stock pump pump housing bring up to 350 DEG C of left sidesRight. Known in the time adding approximately 0.5% molybdenum through testing, can reduce or restrain other alloying elementsThe temper brittleness causing. Under higher temperature, form the special carbonization of filling the air distributionThing, has post-curing effect. Coordinate with manganese to add in the slag stock pump pump housing and more can effectively send outWave the effect in the slag stock pump pump housing of molybdenum and manganese, improve hardness, the through hardening of the slag stock pump pump housingThe mechanical performances such as property.
It is 0.025-0.050%'s that the present invention adds mass percent in the slag stock pump pump housingZirconium. The present invention obtains described zr element, described zirconium silicide by the mode of adding zirconium silicideFor ZrSi, ZrSi2、ZrSi3In one. The zirconium adding can make slag stock pump pump body groupKnit densification, refine austenite crystal grain is strong deoxidation in the slag stock pump pump housing, denitrogenate,Desulfuration element. Zirconium can not only form zirconium carbide with carbon, and also can be combined with sulphur and form sulfide,Thereby reduce the red brittleness of the slag stock pump pump housing, reduce strain-aging phenomenon, improve slag stock pumpThe low-temperature flexibility of the pump housing. In the slag stock pump pump housing, add millesimal zirconium, just can greatly carryHardness and the intensity of the high slag stock pump pump housing. In this slag stock pump pump housing by the quality of zr element hundredProportion by subtraction is controlled at 0.025-0.050%, can make zirconium and other elements produce synergy, makesThe slag stock pump pump housing in the present invention has good combination property.
In the slag stock pump pump housing of the present invention, add copper, the slag stock pump pump housing is hadHigh intensity, toughness and quenching degree. Combine and add with molybdenum in the present invention, make to produceSynergy, in improving quenching degree, can further change again carbide morphologyAnd distribution, and obtain acicular constituent while promoting air quenching. If but copper addition exceedes0.5%, can generate copper-rich phase and micro-crack, therefore the plasticity of the slag stock pump pump housing can fallLow. For stable austenite therefore the present invention the content of copper is controlled at below 0.50%.
In the slag stock pump pump housing of the present invention because niobium there is the obvious refinement of as-cast structure, in AustriaThe disperse NbC particle of regular shape that distributing on family name's body matrix, granularity is below 10 μ m.The slag stock pump pump housing under arms time, produces skid wire after austenite is hit, these skid wiresMust walk around niobium particle, thereby hinder slippage and plastic deformation, improve the slag stock pump pump housing strongDegree performance, particularly yield strength improve nearly 1 times. Trace niobium not only can not affectIn the plasticity of the slag stock pump pump housing or the situation of toughness, improve the intensity of the slag stock pump pump housing, alsoCan increase the temper resistance of the slag stock pump pump housing, have post-curing effect. If but niobium addsAmount too much, there will be thickly containing niobium compound, reduce on the contrary the strong of the slag stock pump pump housingToughness.
In the slag stock pump pump housing of the present invention, sulphur being controlled to 0.025% starches in order to reduce slag with interiorThe red brittleness of the pump pump housing, ductility and the hardness of the raising slag stock pump pump housing.
P and s is similar, and wearability and the mechanical performance of the slag stock pump pump housing are all had especially and hadThe impact of evil. The present invention is controlled at the content of phosphorus in 0.025%, in order to improve slag slurryThe plasticity of the pump pump housing, toughness, wearability, it is tough that every 0.02% P on average reduces impactProperty 1.98J/cm2, drop to 0.02%-0.04 but work as phosphorus from 0.07%-1.0%%, the plasticity of the slag stock pump pump housing, toughness, hardness all can improve 40%-50%, foundry goodsCrackle also can greatly reduce, and also can avoid intercrystalline precipitation eutectic phosphide.
Further, component and the mass percent of the described high rigidity slag stock pump pump housingFor: carbon (C): 2.68%, manganese (Mn): 1.012%, silicon (Si): 0.608%, chromium(Cr:23.65%, nickel (Ni): 0.267%, molybdenum (Mo): 0.164%, zirconium (Zr):0.028%, copper (Cu)≤0.50%, niobium (Nb)≤0.020%, surplus is iron (Fe)And inevitable impurity; The mechanical performance of the described high rigidity slag stock pump pump housing is as follows:Rockwell hardness >=60HB, in wherein said impurity, the mass percent of sulphur (S) is less than or equal to0.019%, the mass percent of phosphorus (P) is less than or equal to 0.019%.
The present invention also provides a kind of preparation method of as the above-mentioned high rigidity slag stock pump pump housing, instituteThe preparation method who states comprises the following steps:
S1, raw material preparation: according to component and the matter of the described high rigidity slag stock pump pump housingAmount percentage preparation raw material.
S2, casting: by the above-mentioned raw material preparing smelt, moulding by casting, obtainThe moulding slag stock pump pump housing.
The cutting of S3, dead head: by above-mentioned moulding slag stock pump pump housing preheating after heat cut, heat plane.
S4, heat treatment: the moulding slag stock pump pump housing after above-mentioned heat plane is carried out to surface finishProcess, while being then warming up to 950-1000 DEG C, carry out normalizing, treat that temperature is 890-920 DEG CShi Jinhang quenches, insulation after quenching, and the air cooling of then coming out of the stove, is 220-250 DEG C in temperatureCondition under tempering, after tempering, be incubated, obtain the finished product high rigidity slag stock pump pump housing.
Heat treatment is to improve and the important procedure that improves steel-casting mechanical property. In heat treatmentBefore, there is larger internal stress in the slag stock pump pump housing, easily cracks, for avoiding when gas cuttingCrackle, need to adopt rising head heat to cut. Can not undercutting casting while should be noted oxygen cutting when heat is cutPart, carbon arc gas rod planing for rising head root. Air-arc cutting utilizes between carbon electrode and foundry goodsProduce come deposite metal up to the electrode of 6000-7000 DEG C, by compressed air by meltingMolten metal blows down, and removes casting head of casting with Dutch. The quenching temperature that the present invention adoptsBe different from the hardening heat of conventional sub-eutectoid steel, set routinely hardening heat and be up to900 DEG C, but quenching effect is unsatisfactory. Steel in heating process, in the time of 400-700 DEG C,Carbide is constantly separated out and is grown up, and 700-900 DEG C time, carbide dissolves gradually, is heated toWhen more than 900 DEG C, even remaining carbide also can all dissolve on crystal boundary. Due to indissolubleThe existence of carbide, be necessary to improve its solid solubility temperature, hardening heat is brought up to890-920 DEG C, the slag stock pump pump housing can reach best toughness and plasticity. Improve the temperature of quenchingDegree is conducive to the homogenising of composition, further reduces high-carbon microcell, increases high dislocation lathThe quantity of strong martensite and film-form retained austenite, thus the strong of the slag stock pump pump housing improvedToughness, strengthens the ability of resisting Crack Extension, alleviates stress and concentrates, and improves toughness.
In the preparation method of the above-mentioned high rigidity slag stock pump pump housing, as preferably, in stepIn S1, obtain described zr element by the mode of adding zirconium silicide, said zirconium silicide isZrSi、ZrSi2、ZrSi3In one.
In the preparation method of the above-mentioned high rigidity slag stock pump pump housing, as preferably, in stepIn S2, temperature when described moulding slag stock pump pump housing cast molding is 1550-1570 DEG C.
Pouring temperature is huge on the grain size impact of steel, and cast cold can obtain aplitic texture,Also can improve toughness. But too low pouring temperature has been upset the consecutive solidification mode of foundry goods,There will be simultaneously and solidify, the gas being involved in while making to pour into a mould and impurity can not get discharging, slag slurryPump pump housing foundry goods can not get due feeding, produces serious shrinkage porosite, even occurs implosionLine.
In the preparation method of the above-mentioned high rigidity slag stock pump pump housing, as preferably, in stepIn S3, preheat temperature when described moulding slag stock pump pump housing preheating is 350-480 DEG C, pre-The heat time is 3-5 hour.
In the preparation method of the above-mentioned high rigidity slag stock pump pump housing, as preferably, in stepIn S4, described normalizing temperature is 960-990 DEG C, and normalizing temperature retention time is 2-4 hour.Described hardening heat is 910-950 DEG C, and Quenching Soaking Time is 2-4 hour; Described temperingTemperature is 200-220 DEG C, and tempering insulation time is 2-4 hour.
If heating-up temperature is on the low side or temperature retention time is not enough in heat treatment, carbide can not be abundantDissolve, frequent on austenitic crystal boundary, and if in heat treatment heating-up temperature higher,Austenite crystal can be grown up.
The present invention also aims to, by the improvement to slag stock pump body construction, improve itHardness, extends its service life, and the described slag stock pump pump housing comprises the body with outlet,Be provided with boss in inner body wall near export department, boss one side and body outlet inner sideWall is in the same plane, and boss another side arc transition is to inner body wall. Pass throughIn pump housing exit, boss is set, not affecting under the rotation of impeller in the pump housing, has improvedThe hardness of slag stock pump.
In above-mentioned slag stock pump, described boss and body are connected as a single entity.
In above-mentioned slag stock pump, described boss thickness is identical with body thickness.
In above-mentioned slag stock pump, described boss radius of curvature is 80mm.
Compared with prior art, the present invention has added zirconium, niobium especially by configuration specific componentsThe raw material of element and extra fine quality percentage, and by special preparation method, simultaneously to slagThe structure of stock pump body is improved, and obtains the slag stock pump pump housing of the present invention. This slag stock pump pumpThe good mechanical property of body, especially has higher hardness, longer service life.
Brief description of the drawings
Fig. 1 is the structural representation of this slag stock pump.
In figure, 1, body; 2, outlet; 3, boss.
Detailed description of the invention
Be below specific embodiments of the invention, technical scheme of the present invention is done furtherDescription, but the present invention is not limited to these embodiment.
Table 1: embodiment 1-3 for the preparation of the component of the high rigidity slag stock pump pump housing andMass percent
Embodiment 1
Press composition and the quality thereof of table 1 embodiment 1 definite high rigidity slag stock pump pump housingPercentage, the composition of the high rigidity slag stock pump pump housing and mass percent thereof are to slag stock pumpThe mechanical performance of the pump housing has a certain impact, the high rigidity of its preparation technology to final formationThe mechanical performance of the slag stock pump pump housing also has larger impact.
Prepare by the following method the high rigidity slag stock pump pump housing:
Raw material preparation: according to pressing in table 1 the high rigidity slag stock pump pump housing described in embodiment 1Component and mass percent preparation raw material.
Casting: the above-mentioned raw material preparing is smelted, is the bar of 1550 DEG C in temperatureMoulding by casting under part, obtains the moulding slag stock pump pump housing.
Dead head cutting: the condition that by the above-mentioned moulding slag stock pump pump housing in temperature is 360 DEG CLower preheating 3 hours, then heat cut, heat plane.
Heat treatment: the moulding slag stock pump pump housing after above-mentioned heat plane is carried out to surface finish processing,Then while being warming up to 960 DEG C, carry out normalizing, after normalizing, be incubated 2 hours. Treat that temperature is 900 DEG CShi Jinhang quenches, insulation 3 hours after quenching, the air cooling of then coming out of the stove. It is 220 DEG C in temperatureCondition under tempering, after tempering, be incubated 2 hours, obtain finished product high rigidity slag stock pump pumpBody.
Embodiment 2
Prepare by the following method the high rigidity slag stock pump pump housing:
Raw material preparation: according to pressing in table 1 the high rigidity slag stock pump pump housing described in embodiment 2Component and mass percent preparation raw material.
Casting: the above-mentioned raw material preparing is smelted, is the bar of 1560 DEG C in temperatureMoulding by casting under part, obtains the moulding slag stock pump pump housing.
Dead head cutting: the condition that by the above-mentioned moulding slag stock pump pump housing in temperature is 420 DEG CLower preheating 4 hours, then heat cut, heat plane.
Heat treatment: the moulding slag stock pump pump housing after above-mentioned heat plane is carried out to surface finish processing,Then while being warming up to 980 DEG C, carry out normalizing, after normalizing, be incubated 3 hours. Treat that temperature is 910 DEG CShi Jinhang quenches, insulation 2 hours after quenching, the air cooling of then coming out of the stove. It is 230 DEG C in temperatureCondition under tempering, after tempering, be incubated 3 hours, obtain finished product high rigidity slag stock pump pumpBody.
Embodiment 3
Prepare by the following method the high rigidity slag stock pump pump housing:
Raw material preparation: according to pressing in table 1 the high rigidity slag stock pump pump housing described in embodiment 3Component and mass percent preparation raw material.
Casting: the above-mentioned raw material preparing is smelted, is the bar of 1570 DEG C in temperatureMoulding by casting under part, obtains the moulding slag stock pump pump housing.
Dead head cutting: the condition that by the above-mentioned moulding slag stock pump pump housing in temperature is 480 DEG CLower preheating 4 hours, then heat cut, heat plane.
Heat treatment: the moulding slag stock pump pump housing after above-mentioned heat plane is carried out to surface finish processing,Then while being warming up to 990 DEG C, carry out normalizing, after normalizing, be incubated 4 hours. Treat that temperature is 920 DEG CShi Jinhang quenches, insulation 3 hours after quenching, the air cooling of then coming out of the stove. It is 250 DEG C in temperatureCondition under tempering, after tempering, be incubated 4 hours, obtain finished product high rigidity slag stock pump pumpBody.
Extract immediately the high rigidity slag stock pump pump housing preparing in embodiment of the present invention 1-3Carry out measuring mechanical property, result is as shown in table 2.
Table 2: the measuring mechanical property result of the high rigidity slag stock pump pump housing
The slag stock pump pump housing in the present invention has good mechanicalness as can be drawn from Table 2Can, especially the hardness of the slag stock pump pump housing is high, long service life.
As shown in Figure 1, the slag stock pump pump housing comprises the body 1 with outlet 2, at body 1Inwall is provided with boss 3 near outlet 2 places, and boss 3 one sides and body 1 export 2Madial wall is in the same plane, and boss 3 another side arc transition are to the pump housing 2 inwallsUpper, boss 3 be connected as a single entity with body 1 and boss 3 thickness identical with the pump housing 1 thickness,Boss 3 radius of curvature are 80mm. Due to original slag stock pump pump housing exit sidewallThin, in use wearing and tearing the most serious, the replacing of most pump housings be all becauseExit wearing and tearing and cannot using, by boss 3 is set in the pump housing 1 exit, notAffect under the rotation of the pump housing 1 interior impeller, improved the hardness of slag stock pump.
Specific embodiment described herein is only to the theory for example of the present invention's spiritBright. Those skilled in the art can be to described specific embodimentMake various amendments or supplement or adopt similar mode to substitute, but can't depart from the present inventionSpirit or surmount the defined scope of appended claims.
Claims (7)
1. a high rigidity slag stock pump pump housing, is characterized in that, described high rigidity slag stock pumpThe component of the pump housing and mass percent are: carbon (C): 2.91%-3.3%, and chromium (Cr):26%-28%, silicon (Si): 0.30%-0.455%, manganese (Mn): 0.665%-1.0%,Nickel (Ni): 0.7%-1.2%, molybdenum (Mo): 0.308%-0.6%, zirconium (Zr):0.025%-0.050%, copper (Cu)≤0.50%, niobium (Nb)≤0.020%, surplus isIron (Fe) and inevitably impurity; The mechanicalness of the described high rigidity slag stock pump pump housingCan be as follows: Rockwell hardness >=60HB.
2. the high rigidity slag stock pump pump housing according to claim 1, is characterized in that,In described impurity, the mass percent of sulphur (S) is less than or equal to 0.040%, the matter of phosphorus (P)Amount percentage is less than or equal to 0.040%.
3. the high rigidity slag stock pump pump housing according to claim 2, is characterized in that,Component and the mass percent of the described high rigidity slag stock pump pump housing are: carbon (C): 2.91%, chromium (Cr): 27.06%, silicon (Si): 0.455%, manganese (Mn): 0.725%, nickel(Ni): 0.765%, molybdenum (Mo): 0.467%, zirconium (Zr): 0.032%, copper (Cu)≤0.50%,Niobium (Nb)≤0.020%, surplus is iron (Fe) and inevitable impurity; DescribedThe mechanical performance of the high rigidity slag stock pump pump housing is as follows: Rockwell hardness >=60HB, and wherein saidIn impurity, the mass percent of sulphur (S) is less than or equal to 0.019%, the quality hundred of phosphorus (P)Proportion by subtraction is less than or equal to 0.019%.
4. a preparation method for the high rigidity slag stock pump pump housing as claimed in claim 1,It is characterized in that, described preparation method comprises the following steps:
S1, raw material preparation: according to component and the matter of the described high rigidity slag stock pump pump housingAmount percentage preparation raw material; Obtain described zr element by the mode of adding zirconium silicide;
S2, casting: by the above-mentioned raw material preparing smelt, moulding by casting, obtainThe moulding slag stock pump pump housing; The temperature of cast molding is 1550-1570 DEG C;
The cutting of S3, dead head: by above-mentioned moulding slag stock pump pump housing preheating after heat cut, heat plane;Preheat temperature is 350-480 DEG C, and be 3-5 hour preheating time;
S4, heat treatment: the moulding slag stock pump pump housing after above-mentioned heat plane is carried out to surface finishProcess, carry out normalizing while being then warming up to 950-1000 DEG C, normalizing temperature retention time is 2-4Hour, in the time that being 890-920 DEG C, temperature quenches, quenching and preserving heat 2-4 hour, thenThe air cooling of coming out of the stove, is tempering under the condition of 220-250 DEG C in temperature, tempering insulation 2-4 hour,Obtain the finished product high rigidity slag stock pump pump housing.
5. the slag stock pump pump housing that preparation method makes as claimed in claim 4, comprisesThe body with outlet, is provided with boss in inner body wall near export department, boss one sideFace and body outlet madial wall are in the same plane, and boss another side arc transition extremelyIn inner body wall, described boss and body are connected as a single entity.
6. the slag stock pump pump housing according to claim 5, is characterized in that, described protrudingPlatform thickness is identical with body thickness.
7. the slag stock pump pump housing according to claim 6, is characterized in that, described protrudingPlatform radius of curvature is 80mm.
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| CN107365901A (en) * | 2017-06-06 | 2017-11-21 | 安徽腾龙泵阀制造有限公司 | A kind of processing method for improving chemical pump pump case case hardness |
| CN109082513B (en) * | 2018-09-12 | 2022-04-15 | 新乡市长城铸钢有限公司 | Heat treatment process for large pump shell |
| CN111850380B (en) * | 2020-07-29 | 2021-08-10 | 南平市建阳区湛卢精密制造有限公司 | Low-temperature carbon steel valve casting material and manufacturing process thereof |
| CN112045170B (en) * | 2020-08-26 | 2022-02-22 | 共享铸钢有限公司 | Method for preventing large steel casting from cracking |
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|---|---|---|---|---|
| CN1036993A (en) * | 1988-04-11 | 1989-11-08 | 苏联科学院西伯利亚分院固体物理和材料科学研究所 | Wear resistant alloy |
| CN102560232A (en) * | 2012-03-06 | 2012-07-11 | 长沙学院 | Hypoeutectic high-chromium cast iron for slurry pump blade and heat treatment process |
| CN102626769A (en) * | 2012-04-10 | 2012-08-08 | 遵义拓特铸锻有限公司 | Manufacturing process of pump body casting of super duplex stainless steel centrifugal pump |
| CN102691677A (en) * | 2012-06-14 | 2012-09-26 | 无锡环宇精密铸造有限公司 | Pump body casting piece |
-
2013
- 2013-05-18 CN CN201310193273.8A patent/CN103305772B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1036993A (en) * | 1988-04-11 | 1989-11-08 | 苏联科学院西伯利亚分院固体物理和材料科学研究所 | Wear resistant alloy |
| CN102560232A (en) * | 2012-03-06 | 2012-07-11 | 长沙学院 | Hypoeutectic high-chromium cast iron for slurry pump blade and heat treatment process |
| CN102626769A (en) * | 2012-04-10 | 2012-08-08 | 遵义拓特铸锻有限公司 | Manufacturing process of pump body casting of super duplex stainless steel centrifugal pump |
| CN102691677A (en) * | 2012-06-14 | 2012-09-26 | 无锡环宇精密铸造有限公司 | Pump body casting piece |
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| Publication number | Publication date |
|---|---|
| CN103305772A (en) | 2013-09-18 |
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