CN107574390A - A kind of phosphoric acid material pulp pump stainless steel impeller and preparation method thereof - Google Patents
A kind of phosphoric acid material pulp pump stainless steel impeller and preparation method thereof Download PDFInfo
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- CN107574390A CN107574390A CN201610517277.0A CN201610517277A CN107574390A CN 107574390 A CN107574390 A CN 107574390A CN 201610517277 A CN201610517277 A CN 201610517277A CN 107574390 A CN107574390 A CN 107574390A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a kind of phosphoric acid material pulp stainless steel impeller and preparation method thereof, comprise the following steps：(1) melting：Add raw materials into melting in intermediate frequency furnace；(2) cast：Round steel, core and chill are put into a mold, and arbor of the gunpowder rope as core is wound on round steel, gunpowder rope burns after core moulding, in mould inner surface brushing alcohol zircon flour coating, poured into a mould using mould assembling after blowtorch surface drying；(3) it is heat-treated：Casting after remove feeders is cooled to 300 DEG C of temperature ＜, bench vehicle type electrical resistance furnace is put into and is heat-treated, then can obtain high carbon and chromium ferritic stainless steel impeller product after cooling.The high carbon and chromium ferritic stainless steel impeller prepared using method provided by the invention can effectively avoid easily separating out the problem of brittlement phase produces casting crack because ferrite content is high in casting process.
Description
Technical field
The present invention relates to conveying equipment for fluid substances casting technology field, and in particular to a kind of phosphoric acid material pulp pump stainless steel impeller
And preparation method thereof.
Background technology
Phosphoric acid material pulp pump (also referred to as turbulence pump) is a kind of vane pump.Mainly it is made up of impeller, the pump housing and pump cover.Impeller is one
Individual disk, the blade on circumference are radial evenly distributed.Annular channel is formed between the pump housing and impeller, suction inlet and outlet are equal
At the excircle of impeller.There is dividing plate between suction inlet and outlet, thus keep apart suction inlet and outlet.At present, phosphorus
Sour slurry pump part is manufactured using low carbon high alloy or nickel-base alloy more.
Application No. 201310241030.7 discloses a kind of processing technology of large-scale two phase stainless steel impeller, including casting
Make, be heat-treated before deformation protection, solutionizing processing, casting cleaning slightly polish, composition reinspection, mechanical performance test, the spy of RT rays
Wound, cleaning defect repair welding slightly polish, roughing, finishing, stress-removal heat treatment, semifinishing, essence polishing, finishing and balance try
The steps such as duplicate removal are tested, dimensional accuracy and the deformation of morpheme size tolerance of impeller can be ensured.
With rising violently for W metal price, the price of austenitic stainless steel is also constantly soaring therewith, and development cost is low and has
There is the important topic that the ferritic stainless steel of excellent corrosion resistance and cold formability turns into current stainless steel anger enterprise.Ferrite is not
Rust steel is without Ni or only contains a small amount of Ni, cheap, and in addition to stainless steel and resistance to general corrosion performance, resistance to chloride stress cracking is rotten
The local corrosion performances such as erosion, resistance to spot corrosion, slit and corrosion resistant are excellent, be in electrician's industry, auto industry, building construction, petrochemical industry and ring
The fields such as guarantor have a wide range of applications and vast potential for future development.Traditional ferritic stainless steel enbrittle transition temperature it is high,
Notch sensitivity is big, postwelding corrosion resistance declines, the shortcomings of being also easy to produce fold during cold working, and limiting that it further expands should
With.
High carbon and chromium ferritic stainless steel, because its ferrite content is too high, easily separates out brittlement phase and produce casting crack, because
This for the big castings production difficulty of complicated, wall thickness variation without can rapidly using and be extended to casting, while to protect
Demonstrate,proving wear-resistant and corrosive nature needs strict control ferrite content scope, also exists and smelts, iron element is unable to reach after heat treatment
The control of body content requires and the difficult point of corrosion resistance difference.For complicated, the casting more than manufacturing process, high carbon and chromium iron element
The application difficulty of body stainless steel is bigger.
The content of the invention
The invention aims to solve high carbon and chromium ferritic stainless steel impeller in the prior art, due to its ferrite
Content is too high, easily separates out brittlement phase and produces casting crack, difficult for the big castings production of complicated, wall thickness variation, there is provided
A kind of phosphoric acid material pulp pump stainless steel impeller and preparation method thereof, can effectively solve because stainless steel impeller is in casting process
Middle ferrite content is high and easily separates out the problem of brittlement phase produces casting crack.
The present invention provides a kind of phosphoric acid material pulp pump stainless steel impeller and preparation method thereof, comprises the following steps：
Step 1：Melting：Add raw materials into melting in intermediate frequency furnace；
Step 2：Casting：Round steel, core and chill are put into a mold, and core of the gunpowder rope as core is wound on round steel
Bone, the gunpowder rope to be burnt after core moulding, the space after the burning of gunpowder rope turns into exhaust passage in cast,
Mould inner surface brushing alcohol zircon flour coating, poured into a mould using mould assembling after blowtorch surface drying 3 minutes, pouring temperature is 1480~1520
℃；
Step 3：Heat treatment：Casting after remove feeders is cooled to 300 DEG C of temperature ＜, is put into bench vehicle type electrical resistance furnace, with
30~55 DEG C/h heating rate is warming up to 400 DEG C, is incubated 1h, then is warming up to 600 DEG C with 50~60 DEG C/h heating rate, protects
Warm 2h, then 850 DEG C are warming up to 50~60 DEG C/h heating rate, 4h is incubated, then room temperature is air-cooled to after being furnace-cooled to 600 DEG C.
The present invention provides a kind of phosphoric acid material pulp pump stainless steel impeller and preparation method thereof, it is preferred that, raw material and
Its mass percent is：High carbon ferro-chrome 15~18%, low P, S stainless steel waste material 51~63%, foundry returns 20~30%, molybdenum-iron 12
~15%, nickel plate 1.0~1.5%, rare earth silicon and magnesium 0.8~1.0%, copper plate 8~12%, ferrosilicon 0.5~1.0%, ferromanganese 0.8
~1.0%, ferrotianium and/or ferro-niobium 0.5~0.8%, vanadium iron 0.15~0.20%, nitrided ferro-chromium 2.5~3.5%.
The present invention provides a kind of phosphoric acid material pulp pump stainless steel impeller and preparation method thereof, it is preferred that, low P, S are not
The trade mark of rust steel waste material is 30Cr13 and/or CD4MCuN and/or 1.4460K.
The present invention provides a kind of phosphoric acid material pulp pump stainless steel impeller and preparation method thereof, it is preferred that, raw material and
Its mass percent be high carbon ferro-chrome 15~18%, 30C,r13 5~6%, CD4MCuN 28~32%, 1.4460K 18~
25%th, foundry returns 20~30%, molybdenum-iron 12~15%, nickel plate 1.0~1.5%, rare earth silicon and magnesium 0.8~1.0%, copper plate 8~
12%th, ferrosilicon 0.5~1.0%, ferromanganese 0.8~1.0%, ferrotianium and/or ferro-niobium 0.5~0.8%, vanadium iron 0.15~0.20%,
Nitrided ferro-chromium 2.5~3.5%.
The present invention provides a kind of phosphoric acid material pulp pump stainless steel impeller and preparation method thereof, it is preferred that, stainless steel
Impeller material is high carbon and chromium stainless steel and iron ferritic, and its each chemical composition is by weight percentage：C 0.8~1.2%, Cr
28.0~32.0%, Ni 2.0~3.0%, Mo 1.5~2.5%, Cu 1.0~3.0%, V 0.08~0.11%, Ti and/or
Nb 0.13~0.17%, La and/or Ce 0.13~0.17%, Si≤0.4%, Mn≤0.8%, P≤0.025%, S≤
0.025%, remaining is Fe and inevitable impurity.
The present invention provides a kind of phosphoric acid material pulp pump stainless steel impeller and preparation method thereof, it is preferred that, step 1 is entered
One step comprises the following steps：
Step 1-1：By low P, S stainless steel waste material shakeout, derusting；
Step 1-2：In intermediate frequency furnace add foundry returns, nickel plate, copper plate, molybdenum-iron, high carbon ferro-chrome temperature be 1430~
At 1470 DEG C with stove be baked to it is melting down after skim；
Step 1-3：Add ferrosilicon, ferromanganese, slag making, deoxidation when temperature rises to 1500 DEG C；
Step 1-4：Nitrided ferro-chromium, ferrotianium and/or ferro-niobium, vanadium iron are sequentially added, and rare earth silicon and magnesium is placed on steel tank, temperature
Degree is come out of the stove when rising to 1520~1550 DEG C.
The present invention provides a kind of phosphoric acid material pulp pump stainless steel impeller and preparation method thereof, it is preferred that, in step 2
Core material is phenol urethane resin sand.
The present invention provides a kind of phosphoric acid material pulp pump stainless steel impeller and preparation method thereof, it is preferred that, in step 2
Running gate system includes sprue, cross gate and ingate, and the material of running gate system is ceramic material, and the sectional area of ingate is institute
State sprue 1.2~1.5 times.The molten metal of cast enters cross gate through sprue, then is poured through ingate 4 into die cavity
Note, the heat of molten metal can be uniformly dispersed, reduce influences on core.
The present invention provides a kind of phosphoric acid material pulp pump stainless steel impeller and preparation method thereof, it is preferred that, preparation side
Method is further comprising the steps of：
Step 4：Quenched at 1040~1080 DEG C, and be tempered at 700 DEG C or so.
The present invention provides a kind of phosphoric acid material pulp pump stainless steel impeller and preparation method thereof, it is preferred that, nickel plate Ni
Content >=99.99%, Cu content >=99.90% of copper plate.
The present invention provides a kind of phosphoric acid material pulp pump stainless steel impeller and preparation method thereof, it is preferred that, Gao Gegao
The metallographic structure of carbon ferritic stainless steel is ferrite+martensite+cementite+retained austenite.Ferrite be carbon dissolution α-
Interstitial solid solution in Fe, there is body-centered cubic lattic, its molten carbon ability is very low, is only capable of being dissolved as 0.0008% under normal temperature
Carbon, at 727 DEG C, maximum molten carbon ability is 0.02%, and ferritic intensity, hardness is not high, but with good plasticity with it is tough
Property.Martensite is a kind of organization name of ferrous material, is supersaturated solid solution of the carbon in α-Fe, have high rigidity and
High intensity.Austenite is a kind of microscopic structure of lamellar of steel, is typicallyThe nonmagnetic solid solution of the middle a small amount of carbon of solid solution
Body, retained austenite are the austenites that quenching fails to be transformed into martensite and remains into room temperature, are the lattice structures of most solid matter, cause
Density is high.Using ferrite and martensite+cementite+retained austenite composition island structure so that stainless steel has good
Moulding and toughness, while can have preferable intensity, avoid separating out brittlement phase in process and producing casting crack.
The present invention is due to high carbon and chromium ferritic stainless steel impeller to be prepared into ferrite and geneva with island structure
Body+cementite+retained austenite composition island structure so that stainless steel impeller has good moulding and toughness, while can
With preferable intensity, avoid separating out brittlement phase in process and producing casting crack.
Brief description of the drawings
Fig. 1 is a kind of phosphoric acid material pulp stainless steel impeller casting mould schematic diagram；
Fig. 2 is high carbon and chromium ferritic stainless steel metallographic structure figure.
Reference：
1st, rising head；2nd, sprue；3rd, cross gate；4th, ingate；5th, core；6th, chill；7th, profile-followed chill；8th, impeller；9、
Ferrite；10th, martensite+cementite+retained austenite.
Embodiment
Embodiment 1
The present invention provides a kind of phosphoric acid material pulp pump stainless steel impeller and preparation method thereof, raw material be high carbon ferro-chrome 15~
18%th, 30C,r13 5~6%, CD4MCuN 28~32%, 1.4460K 18~25%, foundry returns 20~30%, molybdenum-iron 12~
15%th, nickel plate 1.0~1.5%, rare earth silicon and magnesium 0.8~1.0%, copper plate 8~12%, ferrosilicon 0.5~1.0%, ferromanganese 0.8~
1.0%th, ferrotianium and/or ferro-niobium 0.5~0.8%, vanadium iron 0.15~0.20%, nitrided ferro-chromium 2.5~3.5%.
Preparation method comprises the following steps：
Step 1：By 30Cr13, CD4MCuN and 1.4460K shakeout, derusting；
Step 2：In intermediate frequency furnace add foundry returns, nickel plate, copper plate, molybdenum-iron, high carbon ferro-chrome temperature be 1430~
At 1470 DEG C with stove be baked to it is melting down after skim；
Step 3：Add ferrosilicon, ferromanganese, slag making, deoxidation when temperature rises to 1500 DEG C；
Step 4：Nitrided ferro-chromium, ferrotianium and/or ferro-niobium, vanadium iron are sequentially added, and rare earth silicon and magnesium is placed on steel tank, temperature
Come out of the stove when rising to 1520~1550 DEG C.
Step 5：Casting：Casting mould is wound on round steel as shown in Fig. 2 be put into round steel, core and chill in a mold
Arbor of the gunpowder rope as core, the gunpowder rope is burnt after core moulding, the space after the burning of gunpowder rope is being poured
Turn into exhaust passage during note, in mould inner surface brushing alcohol zircon flour coating, poured into a mould using mould assembling after blowtorch surface drying 3 minutes,
Pouring temperature is 1480~1520 DEG C；
Step 6：Heat treatment：Casting after remove feeders is cooled to 300 DEG C of temperature ＜, is put into bench vehicle type electrical resistance furnace, with
45 DEG C/h heating rate is warming up to 400 DEG C, is incubated 1h, then is warming up to 600 DEG C with 55 DEG C/h heating rate, is incubated 2h, then
850 DEG C are warming up to 55 DEG C/h heating rate, is incubated 4h, then room temperature is air-cooled to after being furnace-cooled to 600 DEG C.
Step 7：Quenched at 1040~1080 DEG C, and be tempered at 700 DEG C or so.
Obtained high carbon and chromium ferritic stainless steel impeller, each chemical composition are by weight percentage：C 0.8~1.2%,
Cr 28.0~32.0%, Ni 2.0~3.0%, Mo 1.5~2.5%, Cu 1.0~3.0%, V 0.08~0.11%, Ti
And/or Nb 0.13~0.17%, La and/or Ce 0.13~0.17%, Si≤0.4%, Mn≤0.8%, P≤0.025%, S
≤ 0.025%, remaining is Fe and inevitable impurity.Tensile strength Rm:590MPa；Rockwell hardness HRC：36.0, metallographic group
Knit as shown in Figure 1.
It is described above to be merely exemplary for the purpose of the present invention, and it is nonrestrictive, and those of ordinary skill in the art understand,
In the case where not departing from the spirit and scope that claim is limited, any modification, the change or equivalent that can make, all will
Fall under the scope of the present invention.
Claims (10)
- A kind of 1. phosphoric acid material pulp pump stainless steel impeller and preparation method thereof, it is characterised in that：The preparation method includes following Step：Step 1：Melting：Add raw materials into melting in intermediate frequency furnace；Step 2：Casting：Round steel, core and chill are put into a mold, and core of the gunpowder rope as the core is wound on round steel Bone, the gunpowder rope is burnt after the core moulding, in mould inner surface brushing alcohol zircon flour coating, uses spray The mould assembling cast after 3 minutes of lamp surface drying, pouring temperature are 1480~1520 DEG C；Step 3：Heat treatment：Casting after remove feeders is cooled to 300 DEG C of temperature ＜, is put into bench vehicle type electrical resistance furnace, with 30~ 55 DEG C/h heating rate is warming up to 400 DEG C, is incubated 1h, then is warming up to 600 DEG C with 50~60 DEG C/h heating rate, insulation 2h, then 850 DEG C are warming up to 50~60 DEG C/h heating rate, 4h is incubated, then room temperature is air-cooled to after being furnace-cooled to 600 DEG C.
- A kind of 2. phosphoric acid material pulp pump stainless steel impeller according to claim 1 and preparation method thereof, it is characterised in that：Institute State raw material and its mass percent is：High carbon ferro-chrome 15~18%, low P, S stainless steel waste material 51~63%, foundry returns 20~ 30%th, molybdenum-iron 12~15%, nickel plate 1.0~1.5%, rare earth silicon and magnesium 0.8~1.0%, copper plate 8~12%, ferrosilicon 0.5~ 1.0%th, ferromanganese 0.8~1.0%, ferrotianium and/or ferro-niobium 0.5~0.8%, vanadium iron 0.15~0.20%, nitrided ferro-chromium 2.5~ 3.5%.
- A kind of 3. phosphoric acid material pulp pump stainless steel impeller according to claim 2 and preparation method thereof, it is characterised in that：Institute The trade mark for stating low P, S stainless steel waste material is 30Cr13 and/or CD4MCuN and/or 1.4460K.
- A kind of 4. phosphoric acid material pulp pump stainless steel impeller according to claim 3 and preparation method thereof, it is characterised in that：Institute It is high carbon ferro-chrome 15~18%, 30Cr135~6%, CD4MCuN 28~32%, 1.4460K to state raw material and its mass percent 18~25%, foundry returns 20~30%, molybdenum-iron 12~15%, nickel plate 1.0~1.5%, rare earth silicon and magnesium 0.8~1.0%, copper plate 8~12%, ferrosilicon 0.5~1.0%, ferromanganese 0.8~1.0%, ferrotianium and/or ferro-niobium 0.5~0.8%, vanadium iron 0.15~ 0.20%th, nitrided ferro-chromium 2.5~3.5%.
- A kind of 5. phosphoric acid material pulp pump stainless steel impeller according to claim 4 and preparation method thereof, it is characterised in that：Institute It is high carbon and chromium stainless steel and iron ferritic to state stainless steel impeller material, and its each chemical composition is by weight percentage：C 0.8~ 1.2%th, Cr 28.0~32.0%, Ni 2.0~3.0%, Mo 1.5~2.5%, Cu 1.0~3.0%, V 0.08~ 0.11%th, Ti and/or Nb 0.13~0.17%, La and/or Ce 0.13~0.17%, Si≤0.4%, Mn≤0.8%, P≤ 0.025%, S≤0.025%, remaining is Fe and inevitable impurity.
- 6. a kind of phosphoric acid material pulp pump stainless steel impeller according to Claims 1 to 5 any one and preparation method thereof, its It is characterised by：The step 1 further comprises the steps：Step 1-1：By low P, S stainless steel waste material shakeout, derusting；Step 1-2：It is 1430~1470 that foundry returns, nickel plate, copper plate, molybdenum-iron, high carbon ferro-chrome are added in intermediate frequency furnace in temperature At DEG C with stove be baked to it is melting down after skim；Step 1-3：Add ferrosilicon, ferromanganese, slag making, deoxidation when temperature rises to 1500 DEG C；Step 1-4：Nitrided ferro-chromium, ferrotianium and/or ferro-niobium, vanadium iron are sequentially added, and rare earth silicon and magnesium is placed on steel tank, temperature liter Come out of the stove during to 1520~1550 DEG C.
- A kind of 7. phosphoric acid material pulp pump stainless steel impeller according to claim 1 and preparation method thereof, it is characterised in that：Step Core material described in rapid 2 is phenol urethane resin sand.
- A kind of 8. phosphoric acid material pulp pump stainless steel impeller according to claim 1 and preparation method thereof, it is characterised in that：Step Running gate system described in rapid 2 includes sprue, cross gate and ingate, and the material of the running gate system is ceramic material, described The sectional area of ingate is 1.2~1.5 times of the sprue.
- A kind of 9. phosphoric acid material pulp pump stainless steel impeller according to claim 6 and preparation method thereof, it is characterised in that：Institute It is further comprising the steps of to state preparation method：Step 4：Quenched at 1040~1080 DEG C, and be tempered at 700 DEG C or so.
- A kind of 10. phosphoric acid material pulp pump stainless steel impeller according to claim 6 and preparation method thereof, it is characterised in that： The metallographic structure of the high chromium high-carbon ferritic stainless steel is ferrite+martensite+cementite+retained austenite.
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| CN201610517277.0A CN107574390A (en) | 2016-07-04 | 2016-07-04 | A kind of phosphoric acid material pulp pump stainless steel impeller and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110923560A (en) * | 2019-12-18 | 2020-03-27 | 陕西易莱德新材料科技有限公司 | Impeller material for enhancing corrosion resistance and preparation method thereof |
| CN111958181A (en) * | 2020-07-29 | 2020-11-20 | 南通河海大学海洋与近海工程研究院 | Composite manufacturing method of corrosion-resistant impeller of sea water pump |
| CN112593147A (en) * | 2020-11-18 | 2021-04-02 | 遵义拓特铸锻有限公司 | Chemical pump shell and casting mold and casting method thereof |
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Cited By (3)
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| CN110923560A (en) * | 2019-12-18 | 2020-03-27 | 陕西易莱德新材料科技有限公司 | Impeller material for enhancing corrosion resistance and preparation method thereof |
| CN111958181A (en) * | 2020-07-29 | 2020-11-20 | 南通河海大学海洋与近海工程研究院 | Composite manufacturing method of corrosion-resistant impeller of sea water pump |
| CN112593147A (en) * | 2020-11-18 | 2021-04-02 | 遵义拓特铸锻有限公司 | Chemical pump shell and casting mold and casting method thereof |
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Application publication date: 20180112 |