CN104633214A - High density soft sealing gate valve body and preparation method thereof - Google Patents
High density soft sealing gate valve body and preparation method thereof Download PDFInfo
- Publication number
- CN104633214A CN104633214A CN201410848588.6A CN201410848588A CN104633214A CN 104633214 A CN104633214 A CN 104633214A CN 201410848588 A CN201410848588 A CN 201410848588A CN 104633214 A CN104633214 A CN 104633214A
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- valve body
- soft sealing
- gate valve
- sealing gate
- high density
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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
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- 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
-
- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention provides a high density soft sealing gate valve body. The chemical elementary components of the high density soft sealing gate valve body comprise, by weight, C3.3-3.5, B0.01-0.02, V0.02-0.04, Co1.2-1.5, Mo2-2.4, Si2.5-2.9, Mn<0.6, P<0.08, S<0.01, Cu0.1-0.3, and the balance Fe. According to the preparation method of the high density soft sealing gate valve body, by using the specific components and metallographic waste nodular cast iron and steel scrap, and the intensity, the toughness and the quality stability of the valve body are improved; the balling technology of the preparation method of the high density soft sealing gate valve body enables the absorbing rates of Mg, RE and Si to be high, the balling action is stable, and balling decline dose not occur 15min later after the balling action; B and V are added to the valve body, the compactness and the intensity are improved, the heat resistance is improved by adding Co and Mo, and the pearlitic structrure on the surface of the valve body greatly improves the intensity, the plasticity and the toughness.
Description
Technical field
The present invention relates to casting technology field, particularly relate to soft sealing gate valve valve body of a kind of high densification 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 soft sealing gate valve valve body of a kind of high densification and preparation method thereof, this valve body compactness and intensity high, heat is strong high.
Technological scheme of the present invention is as follows:
A soft sealing gate valve valve body for high densification, is characterized in that: the chemical element composition that it contains and mass percent thereof are: C3.3-3.5, B0.01-0.02, V0.02-0.04, Co 1.2-1.5, Mo2-2.4, Si2.5-2.9, Mn1.3-1.9, P < 0.08, S < 0.01, Cu0.1-0.3, surplus are Fe.
The soft sealing gate valve valve body of described height densification, it is characterized in that this valve body metallographic structure is 62% pearlite+38% ferrite, and be the degree of depth of starting point from surface be 18-22mm scope inner tissue be pearlite, pearlitic interlamellar spacing is between 70-120nm, and in pearlite, cementite thickness is 0.04-0.16 to ferrite thickness.
The production method of the soft sealing gate valve valve body of described height densification, 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: C1.8-2.1, Si0.9-1.4, Mn0.9-1.2, S < 0.01, P < 0.02, Cu0.2-0.3, surplus are Fe, metallographic structure is 70% pearlite, 30% ferrite; The chemical element composition that described steel scrap contains and mass percent are: C1.1-1.5, Si0.8-1.2, Mn0.3-0.5, S < 0.01, P < 0.02, surplus are Fe, and its metallographic structure is bainite.
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 using waste and old spheroidal graphite cast iron and the steel scrap of special component and metallographic, adds 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; This valve body with the addition of B, V, adds compactness and intensity, and by adding Co, Mo, add heat resistance, this valve body surface pearlitic structrure considerably increases intensity, plasticity and toughness.
Embodiment
A soft sealing gate valve valve body for high densification, the chemical element composition that it contains and mass percent thereof are: C3.3-3.5, B0.01-0.02, V0.02-0.04, Co 1.2-1.5, Mo2-2.4, Si2.5-2.9, Mn1.3-1.9, P < 0.08, S < 0.01, Cu0.1-0.3, surplus are Fe.
The soft sealing gate valve valve body of described height densification, it is characterized in that this valve body metallographic structure is 62% pearlite+38% ferrite, and be the degree of depth of starting point from surface be 20mm scope inner tissue be pearlite, pearlitic interlamellar spacing is between 70-120nm, and in pearlite, cementite thickness is 0.04-0.16 to ferrite thickness.
The production method of the soft sealing gate valve valve body of described height densification, 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: C1.8-2.1, Si0.9-1.4, Mn0.9-1.2, S < 0.01, P < 0.02, Cu0.2-0.3, surplus are Fe, metallographic structure is 70% pearlite, 30% ferrite; The chemical element composition that described steel scrap contains and mass percent are: C1.1-1.5, Si0.8-1.2, Mn0.3-0.5, S < 0.01, P < 0.02, surplus are Fe, and its metallographic structure is bainite.
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 590Mpa to this embodiment's valve body material, elongation percentage ∮ is 11.85%, hardness HBS is 245.
Casing rigidity: nominal pressure reaches 1.5 times of 3.45Mpa(working pressure PN10,60 seconds), sealability: nominal pressure reaches 2.39Mpa (working pressure 1.1 times, 30 seconds).
Claims (4)
1. a soft sealing gate valve valve body for high densification, is characterized in that: the chemical element composition that it contains and mass percent thereof are: C3.3-3.5, B0.01-0.02, V0.02-0.04, Co 1.2-1.5, Mo2-2.4, Si2.5-2.9, Mn1.3-1.9, P < 0.08, S < 0.01, Cu0.1-0.3, surplus are Fe.
2. high fine and close soft sealing gate valve valve body according to claim 1, it is characterized in that this valve body metallographic structure is 62% pearlite+38% ferrite, and be the degree of depth of starting point from surface be 18-22mm scope inner tissue be pearlite, pearlitic interlamellar spacing is between 70-120nm, and in pearlite, cementite thickness is 0.04-0.16 to ferrite thickness.
3. the production method of the soft sealing gate valve valve body of the height densification 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: C1.8-2.1, Si0.9-1.4, Mn0.9-1.2, S < 0.01, P < 0.02, Cu0.2-0.3, surplus are Fe, metallographic structure is 70% pearlite, 30% ferrite; The chemical element composition that described steel scrap contains and mass percent are: C1.1-1.5, Si0.8-1.2, Mn0.3-0.5, S < 0.01, P < 0.02, surplus are Fe, and its metallographic structure is bainite.
4. the production method of high fine and close 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 |
|---|---|---|---|
| CN201410848588.6A CN104633214A (en) | 2014-12-31 | 2014-12-31 | High density soft sealing gate valve body and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410848588.6A CN104633214A (en) | 2014-12-31 | 2014-12-31 | High density soft sealing gate valve body and preparation method thereof |
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| CN104633214A true CN104633214A (en) | 2015-05-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410848588.6A Pending CN104633214A (en) | 2014-12-31 | 2014-12-31 | High density soft sealing gate valve body and preparation method thereof |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102912180A (en) * | 2012-10-25 | 2013-02-06 | 无锡中彩新材料股份有限公司 | Metallurgical proportional valve |
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2014
- 2014-12-31 CN CN201410848588.6A patent/CN104633214A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102912180A (en) * | 2012-10-25 | 2013-02-06 | 无锡中彩新材料股份有限公司 | Metallurgical proportional valve |
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Application publication date: 20150520 |
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