CN104633216A - Corrosion-resisting pearlite soft sealing gate valve body and preparing method thereof - Google Patents
Corrosion-resisting pearlite soft sealing gate valve body and preparing method thereof Download PDFInfo
- Publication number
- CN104633216A CN104633216A CN201410849660.7A CN201410849660A CN104633216A CN 104633216 A CN104633216 A CN 104633216A CN 201410849660 A CN201410849660 A CN 201410849660A CN 104633216 A CN104633216 A CN 104633216A
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- CN
- China
- Prior art keywords
- valve body
- pearlite
- soft sealing
- sealing gate
- gate valve
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/04—Construction of housing; Use of materials therefor of sliding valves
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/08—Making cast-iron alloys
- C22C33/10—Making cast-iron alloys including procedures for adding magnesium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
Abstract
A corrosion-resisting pearlite soft sealing gate valve body comprises, by weight, the chemical element components of 3.6%-3.8% of C, 2.5%-2.9% of Si, 8%-8.5% of Cr, 0.05%-0.10% of B, 0.015%-0.02% of Sb, less than 0.6% of Mn, less than 0.08% of P, less than 0.01% of S, 0.05%-0.07% of Mg, 0.2%-0.3% of Al and the balance of Fe. Cr is added to the valve body, corrosion resistance is improved, B is added, compactness and intensity are improved, and low-pressure and middle-pressure valve bodies can be manufactured. By using waste spheroidal graphite cast iron and waste steel with specific components and the metallographic phase, the intensity, the tenacity and the quality stability of the valve body are improved. The absorptivity of Mg, RE and Si is high through a balling technology, balling reaction is stable, and balling declining cannot happen within 15 minutes after balling reaction is over. The intensity, the plasticity and the tenacity of the surface pearlite organization of the valve body are greatly improved.
Description
Technical field
The present invention relates to casting technology field, particularly relate to a kind of corrosion resistant beads body of light soft sealing gate valve valve body and preparation method thereof.
Background technique
Soft sealing gate valve is the important control piece of aqueous medium fluid line, and soft sealing gate valve product mainly comprises: the large parts of valve body, valve plate, trapezoidal nut, trapezoidal thread valve rod, sealing gasket, valve gap, rotation hand wheel 7.Soft sealing gate valve working principle: valve plate is arranged in valve body guiding groove, trapezoidal nut is placed in the groove of valve plate top; Rotation hand wheel is installed in trapezoidal thread valve rod one end, and another end screws in trapezoidal nut; When rotation rotation hand wheel and trapezoidal thread valve rod, drive trapezoidal nut and valve plate to move up and down, valve plate is closed and is opened thus aqueous medium fluid on-off.
That in 7 large parts, one of key core is valve body parts at soft sealing gate valve.Valve plate directly moves up and down in valve member, its dimensional accuracy, Material Strength, directly has influence on soft sealing gate valve and to dam ability and Gate-valve sealing performance.
A lot of soft sealing gate valve valve body is cast by spheroidal graphite cast iron and is formed at present, and spheroidal graphite cast iron also exists some shortcomings, and such as not corrosion-resistant, thermal expansion coefficient is high, and serviceability temperature scope is little, easily causes the shortcomings such as gas leakage.Also need the performance such as hardness, wear resistance, fatigue resistance improving foundry goods in addition, reduce run, drip, leak phenomenon, reduce the defect such as pore, crackle, improve yield rate.These performances can improve the performance of valve body by the composition and technique improving foundry goods.
Summary of the invention
The object of the present invention is to provide a kind of corrosion resistant beads body of light soft sealing gate valve valve body and preparation method thereof, this valve body has high compactness and intensity, may be used for making low-voltage and medium voltage valve body.
Technological scheme of the present invention is as follows:
A kind of corrosion resistant beads body of light soft sealing gate valve valve body, is characterized in that: the chemical element composition that it contains and mass percent thereof are: C3.6-3.8, Si2.5-2.9, Cr8-8.5, B0.05-0.10, Sb0.015-0.02, Mn < 0.6, P < 0.08, S < 0.01, Mg0.05-0.07, Al0.2-0.3, surplus are Fe.
Described corrosion resistant beads body of light soft sealing gate valve valve body, it is characterized in that this valve body metallographic structure is 42% pearlite+58% ferrite, and be the degree of depth of starting point from surface be 13-18mm scope inner tissue be pearlite, pearlitic interlamellar spacing is between 50-90nm, and in pearlite, cementite thickness is 0.09-0.14 to ferrite thickness.
The production method of described corrosion resistant beads body of light soft sealing gate valve valve body, is characterized in that:
Production process comprises batching, reinforced, melting, nodularization, casting, finishing process;
In described burden process, containing the waste and old spheroidal graphite cast iron of 15% weight percentage and the steel scrap of 15% weight percentage in raw material; The chemical element composition that wherein said waste and old spheroidal graphite cast iron contains and mass percent are: C1.8-2.2, Si2.5-2.8, Mn2.3-2.6, S < 0.01, P < 0.02, Mg0.1-0.2, surplus are Fe, metallographic structure is 40% pearlite, 60% ferrite; The chemical element composition that described steel scrap contains and mass percent are: C1.1-1.5, Si1.8-2.2, Mn0.3-0.5, S < 0.01, P < 0.02, surplus are Fe, and its metallographic structure is austenite.
Nodularization operation is: be injected in square steel pipe by the rare earth ferrosilicomagnesium inoculant alloy liquid melted and solidify cooling, get the ferrous alloy containing barium and silicon of 2% weight of molten iron, is melted by ferrous alloy containing barium and silicon, and spray is to square steel pipe surface, and cooling, obtains Integral ball agent bag; Be fixed in nodularization bag by Integral ball agent bag, on inovulant, uniform spreading covers perlite again, pours iron liquid.
Beneficial effect of the present invention
Valve body of the present invention, by adding chromium, adds rotproofness, with the addition of boron, add compactness and intensity, may be used for making low-voltage and medium voltage valve body; By using waste and old spheroidal graphite cast iron and the steel scrap of special component and metallographic, add the intensity of valve body, toughness and quality stability; Spheroidizing process of the present invention makes the absorptivity of Mg, RE and Si high, and spheroidizing reacion is stablized, and spheroidizing reacion does not occur decaying spheroidisation after terminating 15 minutes; The surperficial pearlitic structrure of this valve body considerably increases intensity, plasticity and toughness.
Embodiment
A kind of corrosion resistant beads body of light soft sealing gate valve valve body, the chemical element composition that it contains and mass percent thereof are: C3.6-3.8, Si2.5-2.9, Cr8-8.5, B0.05-0.10, Sb0.015-0.02, Mn < 0.6, P < 0.08, S < 0.01, Mg0.05-0.07, Al0.2-0.3, surplus are Fe.
Described corrosion resistant beads body of light soft sealing gate valve valve body, it is characterized in that this valve body metallographic structure is 42% pearlite+58% ferrite, and be the degree of depth of starting point from surface be 15mm scope inner tissue be pearlite, pearlitic interlamellar spacing is between 50-90nm, and in pearlite, cementite thickness is 0.09-0.14 to ferrite thickness.
The production method of described corrosion resistant beads body of light soft sealing gate valve valve body is:
Production process comprises batching, reinforced, melting, nodularization, casting, finishing process;
In described burden process, containing the waste and old spheroidal graphite cast iron of 15% weight percentage and the steel scrap of 15% weight percentage in raw material; The chemical element composition that wherein said waste and old spheroidal graphite cast iron contains and mass percent are: C1.8-2.2, Si2.5-2.8, Mn2.3-2.6, S < 0.01, P < 0.02, Mg0.1-0.2, surplus are Fe, metallographic structure is 40% pearlite, 60% ferrite; The chemical element composition that described steel scrap contains and mass percent are: C1.1-1.5, Si1.8-2.2, Mn0.3-0.5, S < 0.01, P < 0.02, surplus are Fe, and its metallographic structure is austenite.
Nodularization operation is: be injected in square steel pipe by the rare earth ferrosilicomagnesium inoculant alloy liquid melted and solidify cooling, get the ferrous alloy containing barium and silicon of 2% weight of molten iron, is melted by ferrous alloy containing barium and silicon, and spray is to square steel pipe surface, and cooling, obtains Integral ball agent bag; Be fixed in nodularization bag by Integral ball agent bag, on inovulant, uniform spreading covers perlite again, pours iron liquid.
Laboratory data:
After tested, tensile strength ó b is 589Mpa to this embodiment's valve body material, elongation percentage ∮ is 11.21%, hardness HBS is 236.
Casing rigidity: nominal pressure reaches 1.5 times of 3.39Mpa(working pressure PN10,60 seconds), sealability: nominal pressure reaches 2.35Mpa (working pressure 1.1 times, 30 seconds).
Claims (4)
1. a corrosion resistant beads body of light soft sealing gate valve valve body, is characterized in that: the chemical element composition that it contains and mass percent thereof are: C3.6-3.8, Si2.5-2.9, Cr8-8.5, B0.05-0.10, Sb0.015-0.02, Mn < 0.6, P < 0.08, S < 0.01, Mg0.05-0.07, Al0.2-0.3, surplus are Fe.
2. corrosion resistant beads body of light soft sealing gate valve valve body according to claim 1, it is characterized in that this valve body metallographic structure is 42% pearlite+58% ferrite, and be the degree of depth of starting point from surface be 13-18mm scope inner tissue be pearlite, pearlitic interlamellar spacing is between 50-90nm, and in pearlite, cementite thickness is 0.09-0.14 to ferrite thickness.
3. the production method of the corrosion resistant beads body of light soft sealing gate valve valve body according to claim 1 and 2, is characterized in that:
Production process comprises batching, reinforced, melting, nodularization, casting, finishing process;
In described burden process, containing the waste and old spheroidal graphite cast iron of 15% weight percentage and the steel scrap of 15% weight percentage in raw material; The chemical element composition that wherein said waste and old spheroidal graphite cast iron contains and mass percent are: C1.8-2.2, Si2.5-2.8, Mn2.3-2.6, S < 0.01, P < 0.02, Mg0.1-0.2, surplus are Fe, metallographic structure is 40% pearlite, 60% ferrite; The chemical element composition that described steel scrap contains and mass percent are: C1.1-1.5, Si1.8-2.2, Mn0.3-0.5, S < 0.01, P < 0.02, surplus are Fe, and its metallographic structure is austenite.
4. the production method of corrosion resistant beads body of light soft sealing gate valve valve body according to claim 3, is characterized in that:
Nodularization operation is: be injected in square steel pipe by the rare earth ferrosilicomagnesium inoculant alloy liquid melted and solidify cooling, get the ferrous alloy containing barium and silicon of 2% weight of molten iron, is melted by ferrous alloy containing barium and silicon, and spray is to square steel pipe surface, and cooling, obtains Integral ball agent bag; Be fixed in nodularization bag by Integral ball agent bag, on inovulant, uniform spreading covers perlite again, pours iron liquid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410849660.7A CN104633216A (en) | 2014-12-31 | 2014-12-31 | Corrosion-resisting pearlite soft sealing gate valve body and preparing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410849660.7A CN104633216A (en) | 2014-12-31 | 2014-12-31 | Corrosion-resisting pearlite soft sealing gate valve body and preparing method thereof |
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| CN104633216A true CN104633216A (en) | 2015-05-20 |
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| CN201410849660.7A Pending CN104633216A (en) | 2014-12-31 | 2014-12-31 | Corrosion-resisting pearlite soft sealing gate valve body and preparing method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107739974A (en) * | 2017-10-23 | 2018-02-27 | 宁国市正兴耐磨材料有限公司 | A kind of high-intensity high-tenacity wear-resistant ball and its preparation technology |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102022554A (en) * | 2009-09-23 | 2011-04-20 | 上海自动化仪表股份有限公司 | Elastic valve plug assembly of control valve |
| CN103667937A (en) * | 2013-11-08 | 2014-03-26 | 张超 | Wear-resistant alloy steel material for valve bodies and preparation method thereof |
-
2014
- 2014-12-31 CN CN201410849660.7A patent/CN104633216A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102022554A (en) * | 2009-09-23 | 2011-04-20 | 上海自动化仪表股份有限公司 | Elastic valve plug assembly of control valve |
| CN103667937A (en) * | 2013-11-08 | 2014-03-26 | 张超 | Wear-resistant alloy steel material for valve bodies and preparation method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107739974A (en) * | 2017-10-23 | 2018-02-27 | 宁国市正兴耐磨材料有限公司 | A kind of high-intensity high-tenacity wear-resistant ball and its preparation technology |
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Application publication date: 20150520 |
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