CN105839016A - Casting method of anti-corrosion stop valve body for sewage pipe - Google Patents

Casting method of anti-corrosion stop valve body for sewage pipe Download PDF

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Publication number
CN105839016A
CN105839016A CN201610343141.2A CN201610343141A CN105839016A CN 105839016 A CN105839016 A CN 105839016A CN 201610343141 A CN201610343141 A CN 201610343141A CN 105839016 A CN105839016 A CN 105839016A
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CN
China
Prior art keywords
casting
valve body
coating
oozed
component
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Pending
Application number
CN201610343141.2A
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Chinese (zh)
Inventor
刘奎新
刘瑞
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ANHUI XINHONG MACHINERY CO LTD
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ANHUI XINHONG MACHINERY CO LTD
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Priority to CN201610343141.2A priority Critical patent/CN105839016A/en
Publication of CN105839016A publication Critical patent/CN105839016A/en
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/08—Casting in, on, or around objects which form part of the product for building-up linings or coverings, e.g. of anti-frictional metal
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
    • 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
    • C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
    • 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
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • 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
    • C22C38/10—Ferrous alloys, e.g. steel alloys containing cobalt
    • C22C38/105—Ferrous alloys, e.g. steel alloys containing cobalt containing Co and Ni
    • 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
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • 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
    • C21D2251/00—Treating composite or clad material
    • C21D2251/02—Clad material

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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)
  • Valve Housings (AREA)
  • Lift Valve (AREA)
  • Prevention Of Electric Corrosion (AREA)

Abstract

The invention discloses a casting method of an anti-corrosion stop valve body for a sewage pipe. The casing method comprises steps as follows: (1), a pouring liquid is prepared and comprises chemical components in percentage by weight as follows: 0.22%-0.26% of C, 0.25%-0.45% of Si, 0.60%-0.80% of Mn, 2.5%-4.5% of Cr, 0.60%-0.80% of Ni, 0.10%-0.15% of Co, 0.05%-0.10% of W, smaller than or equal to 0.03% of P, smaller than or equal to 0.02% of S and the balance of Fe; step (2), a casting-infiltration coating is prepared; (3), valve body pouring is performed; (4), heat treatment and finishing are performed. According to the stop valve body prepared with the casting method, the stable casting-infiltration composite layer is formed on the surface; furthermore, the stop valve body has excellent antifouling performance, excellent wear resistance, high finished product ratio, stable quality, good appearance quality and usability and long service life and is applicable to the sewage pipe.

Description

A kind of casting method of sewage conduct anti-corrosion stop valve valve body
Technical field
The present invention relates to valve casting technology field, particularly relate to the casting method of a kind of sewage conduct anti-corrosion stop valve valve body.
Background technology
Valve is flowable materials conveying and the vitals controlled, and in use, in addition to the requirement of the technical specifications such as temperature to be met, pressure, is also adapted to the different needs of heterogeneity material, such as corrosion, wear, adhesion etc..Meanwhile, sealing property and the service life of valve is also highly important technical specification.
Casting infiltration is at mo(U)ld face by raw material furnishing coating application such as alloyed powders, parent metal immersion antireflective coating material capillary porosity during cast, rely on molten metal heat to make alloy powder melt, melt, combine together with parent metal, thus form the surface composite layer with superperformance at cast(ing) surface.Infiltration technology is promoting while cast properties, has and need not the advantage that special equipment, technique are simple, with short production cycle, with low cost.But, it is susceptible to the problems such as pore, slag inclusion and surface composite layer uneven thickness due to Infiltration technology, causes casting flaw when being applied to valve body production, affect presentation quality and the service life of valve body.Document " research of casting infiltration raising cast steel valve wearability " uses technology of infiltration casting to prepare the valve that flushing resistance is good, improves the service life of valve, but it also indicates that simultaneously, and the problem of casting quality layer poor stability yet suffers from, and need to improve further.Therefore, selecting suitable processing temperature, suitable base material and casting to ooze coating, optimize casting method, improving technology of infiltration casting, to be combined the quality stability of valve body moulding most important.
Summary of the invention
The object of the invention is contemplated to make up the defect of prior art, it is provided that a kind of steady quality, presentation quality and serviceability are good, the casting method of the sewage conduct anti-corrosion stop valve valve body of length in service life.
The present invention is achieved by the following technical solutions:
The casting method of a kind of sewage conduct anti-corrosion stop valve valve body, comprises the following steps:
(1) preparation potting syrup, the chemical component weight percentage ratio of described potting syrup is as follows: C:0.22%-0.26%, Si:0.25%-0.45%, Mn:0.60%-0.80%, Cr:2.5%-4.5%, Ni:0.60%-0.80%, Co:0.10%-0.15%, W:0.05%-0.10%, P≤0.03%, S≤0.02%, surplus is Fe, each raw material is i.e. obtained potting syrup in medium-frequency induction furnace after 1580-1620 DEG C of melting, adjustment chemical composition；
(2) coating is oozed in preparation casting, and described casting is oozed coating and is prepared by the raw materials in: 200-300 mesh high-carbon chromium iron 40-50,200-300 mesh zinc aluminium alloy powder 5-10, nano lanthanum oxide 1-2, polyvinyl alcohol 0.5-1, acrylic acid 0.1-0.2, hydroxyethyl cellulose 0.3-0.5, Ammonium persulfate. 0.01-0.015, Lithium metasilicate 2-4, sodium fluoride 1-2, aluminum sulfate 0.5-1, CNT 1-2, silane resin acceptor kh-550 0.5-1；It is first by uniform for dispersed with stirring in CNT, nano lanthanum oxide, hydroxyethyl cellulose and silane resin acceptor kh-550 addition ethanol in proper amount that the preparation method of coating is oozed in described casting, it is subsequently adding high-carbon chromium iron, zinc aluminium alloy powder stirring 1-2h, it is dried and removes 100-120 DEG C of process 0.5-1h after ethanol, obtain component A；Polyvinyl alcohol first adds 85-95 DEG C of dissolving in suitable quantity of water completely, be subsequently adding acrylic acid and Ammonium persulfate. 60-70 DEG C stirring 2-4h, after cooling, obtain B component；Component A, B component is uniform with remaining raw material mixed grinding, obtain casting and ooze coating；
(3) cast valve body, first by core in 220-240 DEG C of drying and processing 4-6h, then casting is oozed coating and is coated uniformly on core surface, coating thickness is 1.5-2.5mm, process 1-2h, then mould assembling then at 160-180 DEG C, then potting syrup is poured into a mould under the conditions of 1520-1560 DEG C, it is cooled to room temperature with 20-30 DEG C/h, then carries out finishing；
(4) heat treatment, valve body after step (3) being processed is in 200-300 DEG C of isothermal holding 2-4h, then it is to slowly warm up to 800-850 DEG C of isothermal holding 6-8h with 60-80 DEG C/h, again with 30-50 DEG C/h of slow cooling to 600-650 DEG C of isothermal holding 4-6h, finally it is slowly dropped to room temperature with 50-60 DEG C/h, again obtains finished product after finishing.
The invention have the advantage that
The present invention utilizes CNT, nano lanthanum oxide, hydroxyethyl cellulose and silane resin acceptor kh-550 that high-carbon chromium iron, zinc aluminium alloy powder are carried out surface coating modification as casting infiltration layer material; alloy powder is had good surface protection effect; improve the wettability with molten metal, strengthen metallurgical interface bond strength；Using acrylic acid modified polyvinyl alcohol as binding agent, bond strength is high, and can form stable capillary gap, improves molten metal and wettability that casting is oozed between coating, advantageously forms uniform, stable casting infiltration layer；Being processed by the mixed grinding of remaining raw material, the casting obtained is oozed coating and is fused with metallic matrix through cast, and the compound valve body matrix obtained, through the subsequent processing steps such as Overheating Treatment, finishing, finally gives finished product again.The stop valve body obtained by casting method of the present invention, surface forms uniform, stable casting and oozes composite bed, and has excellent antifouling, decay resistance, and yield rate is high, steady quality, presentation quality and serviceability are good, service life is long, it is adaptable to sewage conduct uses.
Detailed description of the invention
The casting method of a kind of sewage conduct anti-corrosion stop valve valve body, comprises the following steps:
(1) preparation potting syrup, the chemical component weight percentage ratio of described potting syrup is as follows: C:0.22%, Si:0.25%, Mn:0.60%, Cr:2.5%, Ni:0.60%, Co:0.10%, W:0.05%, P:0.03%, S:0.02%, surplus is Fe, each raw material is i.e. obtained potting syrup in medium-frequency induction furnace after 1580 DEG C of meltings, adjustment chemical composition；
(2) coating is oozed in preparation casting, and described casting is oozed coating and is made up of the raw material of following weight (kg): 200 mesh high-carbon chromium iron 40,200 mesh zinc aluminium alloy powder 5, nano lanthanum oxide 1, polyvinyl alcohol 0.5, acrylic acid 0.1, hydroxyethyl cellulose 0.3, Ammonium persulfate. 0.01, Lithium metasilicate 2, sodium fluoride 1, aluminum sulfate 0.5, CNT 1, silane resin acceptor kh-550 0.5；It is first by uniform for dispersed with stirring in CNT, nano lanthanum oxide, hydroxyethyl cellulose and silane resin acceptor kh-550 addition ethanol in proper amount that the preparation method of coating is oozed in described casting, it is subsequently adding high-carbon chromium iron, zinc aluminium alloy powder stirring 1h, it is dried and removes 100 DEG C of process 0.5h after ethanol, obtain component A；Polyvinyl alcohol first adds 85 DEG C of dissolvings in suitable quantity of water completely, be subsequently adding acrylic acid and Ammonium persulfate. 60 DEG C stirring 2h, after cooling, obtain B component；Component A, B component is uniform with remaining raw material mixed grinding, obtain casting and ooze coating；
(3) cast valve body, first by core in 220 DEG C of drying and processing 4h, then oozes casting coating and is coated uniformly on core surface, coating thickness is 1.5mm, processes 1h, then mould assembling then at 160 DEG C, again potting syrup is poured into a mould under the conditions of 1520 DEG C, be cooled to room temperature with 20 DEG C/h, then carry out finishing；
(4) heat treatment, valve body after step (3) being processed, in 200 DEG C of isothermal holding 2h, is then to slowly warm up to 800 DEG C of isothermal holding 6h with 60 DEG C/h, then with 30 DEG C/h of slow coolings to 600 DEG C of isothermal holding 4h, finally it is slowly dropped to room temperature with 50 DEG C/h, again obtains finished product after finishing.
Wherein the model of high-carbon chromium iron selects FeCr67C6.0.
The performance test results of the said goods is as follows:
Casting infiltration layer intensity is 58.9HRC, and service life is 4 times of common WCB valve body, and during actual condition uses, composite bed will not peel off, ftracture, and operation conditions is good.

Claims (1)

1. the sewage conduct casting method of anti-corrosion stop valve valve body, it is characterised in that comprise the following steps:
(1) preparation potting syrup, the chemical component weight percentage ratio of described potting syrup is as follows: C:0.22%-0.26%, Si:0.25%-0.45%, Mn:0.60%-0.80%, Cr:2.5%-4.5%, Ni:0.60%-0.80%, Co:0.10%-0.15%, W:0.05%-0.10%, P≤0.03%, S≤0.02%, surplus is Fe, each raw material is i.e. obtained potting syrup in medium-frequency induction furnace after 1580-1620 DEG C of melting, adjustment chemical composition；
(2) coating is oozed in preparation casting, and described casting is oozed coating and is prepared by the raw materials in: 200-300 mesh high-carbon chromium iron 40-50,200-300 mesh zinc aluminium alloy powder 5-10, nano lanthanum oxide 1-2, polyvinyl alcohol 0.5-1, acrylic acid 0.1-0.2, hydroxyethyl cellulose 0.3-0.5, Ammonium persulfate. 0.01-0.015, Lithium metasilicate 2-4, sodium fluoride 1-2, aluminum sulfate 0.5-1, CNT 1-2, silane resin acceptor kh-550 0.5-1；It is first by uniform for dispersed with stirring in CNT, nano lanthanum oxide, hydroxyethyl cellulose and silane resin acceptor kh-550 addition ethanol in proper amount that the preparation method of coating is oozed in described casting, it is subsequently adding high-carbon chromium iron, zinc aluminium alloy powder stirring 1-2h, it is dried and removes 100-120 DEG C of process 0.5-1h after ethanol, obtain component A；Polyvinyl alcohol first adds 85-95 DEG C of dissolving in suitable quantity of water completely, be subsequently adding acrylic acid and Ammonium persulfate. 60-70 DEG C stirring 2-4h, after cooling, obtain B component；Component A, B component is uniform with remaining raw material mixed grinding, obtain casting and ooze coating；
(3) cast valve body, first by core in 220-240 DEG C of drying and processing 4-6h, then casting is oozed coating and is coated uniformly on core surface, coating thickness is 1.5-2.5mm, process 1-2h, then mould assembling then at 160-180 DEG C, then potting syrup is poured into a mould under the conditions of 1520-1560 DEG C, it is cooled to room temperature with 20-30 DEG C/h, then carries out finishing；
(4) heat treatment, valve body after step (3) being processed is in 200-300 DEG C of isothermal holding 2-4h, then it is to slowly warm up to 800-850 DEG C of isothermal holding 6-8h with 60-80 DEG C/h, again with 30-50 DEG C/h of slow cooling to 600-650 DEG C of isothermal holding 4-6h, finally it is slowly dropped to room temperature with 50-60 DEG C/h, again obtains finished product after finishing.
CN201610343141.2A 2016-05-23 2016-05-23 Casting method of anti-corrosion stop valve body for sewage pipe Pending CN105839016A (en)

Priority Applications (1)

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CN201610343141.2A CN105839016A (en) 2016-05-23 2016-05-23 Casting method of anti-corrosion stop valve body for sewage pipe

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Application Number Priority Date Filing Date Title
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007056289A (en) * 2005-08-23 2007-03-08 Hitachi Metals Ltd Tool steel stock for hardening
CN103003220A (en) * 2010-06-30 2013-03-27 新加坡国立大学 Porous ceramic matrix
CN105108055A (en) * 2015-09-29 2015-12-02 河南科技大学 Preparation method of cast-infiltration high-carbon high-chromium manganese-containing wear-resistant composite material
CN105140449A (en) * 2015-08-14 2015-12-09 中国人民解放军63971部队 Method for protecting anode of lithium sulfur battery

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007056289A (en) * 2005-08-23 2007-03-08 Hitachi Metals Ltd Tool steel stock for hardening
CN103003220A (en) * 2010-06-30 2013-03-27 新加坡国立大学 Porous ceramic matrix
CN105140449A (en) * 2015-08-14 2015-12-09 中国人民解放军63971部队 Method for protecting anode of lithium sulfur battery
CN105108055A (en) * 2015-09-29 2015-12-02 河南科技大学 Preparation method of cast-infiltration high-carbon high-chromium manganese-containing wear-resistant composite material

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Application publication date: 20160810

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