CN104561797A - Pearlitic soft-sealing brake valve body easy to weld and preparation method thereof - Google Patents
Pearlitic soft-sealing brake valve body easy to weld and preparation method thereof Download PDFInfo
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- CN104561797A CN104561797A CN201410848562.1A CN201410848562A CN104561797A CN 104561797 A CN104561797 A CN 104561797A CN 201410848562 A CN201410848562 A CN 201410848562A CN 104561797 A CN104561797 A CN 104561797A
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Abstract
The invention relates to a pearlitic soft-sealing brake valve body easy to weld. The valve body comprises the following chemical element ingredients by mass percent: 3.2-3.6% of Cr, 3.6-3.8% of C, 2.7-2.9% of Si, less than 0.6% of Mn, less than 0.08% of P, less than 0.01% of S, 0.003-0.05% of Se, 0.01-0.08% of Nb, 0.003-0.01% of Al and the balance of Fe. By adding Se, Nb and Cr, the strength and corrosion resistance of the valve body are improved, and the cutting performance is good; by using specific ingredients, and metallographical waste nodular cast iron and waste steel, the strength, toughness and quality stability of the valve body are improved; the balling process enables the absorption rate of Mg, RE and Si to be increased, the balling reaction is stable, and balling decaying is prevented 15 min after the balling reaction; the pearlitic structure on the surface of the valve body greatly improves the strength, plasticity and toughness.
Description
Technical field
The present invention relates to casting technology field, particularly relate to a kind of easily weld spatter body of light soft sealing gate valve valve body and preparation method thereof.
Background technology
Soft sealing gate valve is water medium fluid line important control part, and soft sealing gate valve product mainly comprises: the large parts of valve body, valve plate, trapezoidal nut, trapezoidal thread valve rod, gasket, valve gap, rotation hand wheel 7.Soft sealing gate valve principle of work: valve plate is arranged in valve body guide path, 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 water medium fluid on-off.
That in 7 large parts, one of key core is valve part at soft sealing gate valve.Valve plate directly moves up and down in valve member, its dimensional precision, 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 expansivity is high, and use 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 easily weld spatter body of light soft sealing gate valve valve body and preparation method thereof, this body strength is high, good corrosion resistance, simultaneously excellent cutting performance.
Technical scheme of the present invention is as follows:
A kind of easily weld spatter 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: Cr 3.2-3.6, C2.6-2.9, Si2.7-2.9, Mn1.3-1.6, P < 0.08, S < 0.01, Se0.003-0.05, Nb0.01-0.08, Al0.003-0.01, surplus are Fe.
Described easy weld spatter body of light soft sealing gate valve valve body, it is characterized in that this valve body metallographic structure is 58% perlite+42% ferrite, and be the degree of depth of starting point from surface be 17-20mm scope inner tissue be perlite, pearlitic interlamellar spacing is between 70-170nm, and in perlite, the ratio of cementite thickness to ferrite thickness is 0.10-0.16.
The production method of described easy weld spatter 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 percent and the steel scrap of 15% weight percent in raw material; The chemical element composition that wherein said waste and old spheroidal graphite cast iron contains and mass percent are: C0.8-1.2, Si1.5-1.8, Mn2.3-2.6, S < 0.01, P < 0.02, surplus are Fe, its metallographic structure is 50% perlite, 50% ferrite; The chemical element composition that described steel scrap contains and mass percent are: C1.1-1.5, Si0.8-1.2, Mn1.3-1.7, S < 0.01, P < 0.02, Cr2.3-2.6, 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 nucleating agent, uniform spreading covers perlite again, pours iron liquid.
Beneficial effect of the present invention
Valve body of the present invention, by adding Se, Nb, Cr, adds intensity and the erosion resistance of valve body, simultaneously excellent cutting performance, 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; Spheriodizing technique of the present invention makes the specific absorption 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 structure of this valve body considerably increases intensity, plasticity and toughness.
Embodiment
A kind of easily weld spatter body of light soft sealing gate valve valve body, the chemical element composition that it contains and mass percent thereof are: Cr 3.2-3.6, C2.6-2.9, Si2.7-2.9, Mn1.3-1.6, P < 0.08, S < 0.01, Se0.003-0.05, Nb0.01-0.08, Al0.003-0.01, surplus are Fe.
Described easy weld spatter body of light soft sealing gate valve valve body, it is characterized in that this valve body metallographic structure is 58% perlite+42% ferrite, and be the degree of depth of starting point from surface be 19mm scope inner tissue be perlite, pearlitic interlamellar spacing is 70-170nm, and in perlite, the ratio of cementite thickness to ferrite thickness is 0.10-0.16.
The production method of described easy weld spatter 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 percent and the steel scrap of 15% weight percent in raw material; The chemical element composition that wherein said waste and old spheroidal graphite cast iron contains and mass percent are: C0.8-1.2, Si1.5-1.8, Mn2.3-2.6, S < 0.01, P < 0.02, surplus are Fe, its metallographic structure is 50% perlite, 50% ferrite; The chemical element composition that described steel scrap contains and mass percent are: C1.1-1.5, Si0.8-1.2, Mn1.3-1.7, S < 0.01, P < 0.02, Cr2.3-2.6, 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 nucleating agent, uniform spreading covers perlite again, pours iron liquid.
Experimental data:
After tested, tensile strength ó b is 565Mpa to this embodiment valve body material, elongation ∮ is 11.39%, hardness HBS is 246.
Casing rigidity: nominal pressure reaches 1.5 times of 3.45Mpa(operating pressure PN10,60 seconds), sealing property: nominal pressure reaches 2.39Mpa (operating pressure 1.1 times, 30 seconds).
Claims (4)
1. an easy weld spatter 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: Cr 3.2-3.6, C2.6-2.9, Si2.7-2.9, Mn1.3-1.6, P < 0.08, S < 0.01, Se0.003-0.05, Nb0.01-0.08, Al0.003-0.01, surplus are Fe.
2. easy weld spatter body of light soft sealing gate valve valve body according to claim 1, it is characterized in that this valve body metallographic structure is 58% perlite+42% ferrite, and be the degree of depth of starting point from surface be 17-20mm scope inner tissue be perlite, pearlitic interlamellar spacing is between 70-170nm, and in perlite, the ratio of cementite thickness to ferrite thickness is 0.10-0.16.
3. the production method of the easy weld spatter 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 percent and the steel scrap of 15% weight percent in raw material; The chemical element composition that wherein said waste and old spheroidal graphite cast iron contains and mass percent are: C0.8-1.2, Si1.5-1.8, Mn2.3-2.6, S < 0.01, P < 0.02, surplus are Fe, its metallographic structure is 50% perlite, 50% ferrite; The chemical element composition that described steel scrap contains and mass percent are: C1.1-1.5, Si0.8-1.2, Mn1.3-1.7, S < 0.01, P < 0.02, Cr2.3-2.6, surplus are Fe, and its metallographic structure is bainite.
4. the production method of easy weld spatter 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 nucleating agent, uniform spreading covers perlite again, pours iron liquid.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410848562.1A CN104561797A (en) | 2014-12-31 | 2014-12-31 | Pearlitic soft-sealing brake valve body easy to weld and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410848562.1A CN104561797A (en) | 2014-12-31 | 2014-12-31 | Pearlitic soft-sealing brake valve body easy to weld and preparation method thereof |
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| CN104561797A true CN104561797A (en) | 2015-04-29 |
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| CN201410848562.1A Pending CN104561797A (en) | 2014-12-31 | 2014-12-31 | Pearlitic soft-sealing brake valve body easy to weld and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109487173A (en) * | 2018-11-21 | 2019-03-19 | 天津市华油钢管有限公司 | A kind of corrosion resistant oil transportation spiral submerged welded pipe and preparation method thereof |
| CN111663074A (en) * | 2020-06-18 | 2020-09-15 | 淮南沃力特流体设备有限公司 | Corrosion-resistant gate valve and machining process thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2005514519A (en) * | 2002-01-14 | 2005-05-19 | ゲオルク フィッシャー ファールツォイクテヒニーク アクチェンゲゼルシャフト | Nodular cast iron alloy |
| CN101177766A (en) * | 2007-12-04 | 2008-05-14 | 刘少杰 | High-chromium alloy cast-iron concrete mixer lining board and method for manufacturing the same |
| CN102049485A (en) * | 2009-10-27 | 2011-05-11 | 鞍钢重型机械有限责任公司 | Method for composite centrifugal casting high-chromium steel roller |
| CN102994907A (en) * | 2012-09-29 | 2013-03-27 | 铜陵国方水暖科技有限责任公司 | Casting method of check valve body |
-
2014
- 2014-12-31 CN CN201410848562.1A patent/CN104561797A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005514519A (en) * | 2002-01-14 | 2005-05-19 | ゲオルク フィッシャー ファールツォイクテヒニーク アクチェンゲゼルシャフト | Nodular cast iron alloy |
| CN101177766A (en) * | 2007-12-04 | 2008-05-14 | 刘少杰 | High-chromium alloy cast-iron concrete mixer lining board and method for manufacturing the same |
| CN102049485A (en) * | 2009-10-27 | 2011-05-11 | 鞍钢重型机械有限责任公司 | Method for composite centrifugal casting high-chromium steel roller |
| CN102994907A (en) * | 2012-09-29 | 2013-03-27 | 铜陵国方水暖科技有限责任公司 | Casting method of check valve body |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109487173A (en) * | 2018-11-21 | 2019-03-19 | 天津市华油钢管有限公司 | A kind of corrosion resistant oil transportation spiral submerged welded pipe and preparation method thereof |
| CN111663074A (en) * | 2020-06-18 | 2020-09-15 | 淮南沃力特流体设备有限公司 | Corrosion-resistant gate valve and machining process thereof |
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Application publication date: 20150429 |