CN104565486A - Sewage pipe soft seal gate valve body and preparation method thereof - Google Patents
Sewage pipe soft seal gate valve body and preparation method thereof Download PDFInfo
- Publication number
- CN104565486A CN104565486A CN201410848730.7A CN201410848730A CN104565486A CN 104565486 A CN104565486 A CN 104565486A CN 201410848730 A CN201410848730 A CN 201410848730A CN 104565486 A CN104565486 A CN 104565486A
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- CN
- China
- Prior art keywords
- valve body
- gate valve
- perlite
- sewage pipe
- soft sealing
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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
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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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
Disclosed is a sewage pipe soft seal gate valve body. The sewage pipe soft seal gate valve body is composed of chemical element components including, by mass percentage, 2.1-2.4 of C, 0.04-0.07 of Si, 2.5-2.9 of Si, 2.0-2.5 of Mn, less than 0.03 of P, less than 0.01 of S, 2-3 of Cr, 0.03-0.05 of La, 3.5-3.9 of Ni and Fe as balance. According to the sewage pipe soft seal gate valve body, by adding Ni and Cr, the corrosion resistance and the thermal resistance of the valve body can be enhanced, and the sewage pipe soft seal gate valve body is applied to a sewage pipe; by means of specific components and metallic phase waste nodular cast iron as well as waste steel, the strength, the tenacity and the quality stability of the valve body can be enhanced; a nodulizing process enhances the absorptivity of Mg, RE and Si, stabilizes nodulizing reaction and avoids nodulizing degradation after 15 minutes of the nodulizing reaction is completed.
Description
Technical field
The present invention relates to casting technology field, particularly relate to a kind of sewer line 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 sewer line soft sealing gate valve valve body and preparation method thereof, this valve body is corrosion-resistant and resistance toheat is good, is applicable to sewer line.
Technical scheme of the present invention is as follows:
A kind of sewer line soft sealing gate valve valve body, is characterized in that: the chemical element composition that it contains and mass percent thereof are: C2.1-2.4, Sc 0.04-0.07, Si2.5-2.9, Mn2.0-2.6, P < 0.03, S < 0.01, Cr2-3, La0.03-0.05, Ni3.5-3.9, surplus are Fe.
Described sewer line soft sealing gate valve valve body, it is characterized in that this valve body metallographic structure is 50% perlite+50% ferrite, and be the degree of depth of starting point from surface be 15-20mm scope inner tissue be perlite, pearlitic interlamellar spacing is between 100-160nm, in perlite, the ratio of cementite thickness to ferrite thickness is 0.11-0.23, and pearlitic median size is 9-15 μm.
The production method of described sewer line 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, Mn2.1-2.4, S < 0.01, P < 0.02, Sc0.05-0.08, surplus are Fe, metallographic structure is 60% perlite, 40% ferrite; The chemical element composition that described steel scrap contains and mass percent are: C0.5-0.8, Si0.8-1.2, Mn0.3-0.5, Ni1-1.2, S < 0.01, P < 0.02, V0.3-0.6, 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 with the addition of nickel and chromium, adds the corrosion-resistant of valve body and resistance toheat, is applicable to sewer line; 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; 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.
Embodiment
A kind of sewer line soft sealing gate valve valve body, the chemical element composition that it contains and mass percent thereof are: C2.1-2.4, Sc 0.04-0.07, Si2.5-2.9, Mn2.0-2.6, P < 0.03, S < 0.01, Cr2-3, La0.03-0.05, Ni3.5-3.9, surplus are Fe.
Described sewer line soft sealing gate valve valve body, this valve body metallographic structure is 50% perlite+50% ferrite, and be the degree of depth of starting point from surface be 18mm scope inner tissue be perlite, pearlitic interlamellar spacing is between 100-160nm, in perlite, the ratio of cementite thickness to ferrite thickness is 0.11-0.23, and pearlitic median size is 12 μm.
The production method of described sewer line 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, Mn2.1-2.4, S < 0.01, P < 0.02, Sc0.05-0.08, surplus are Fe, metallographic structure is 60% perlite, 40% ferrite; The chemical element composition that described steel scrap contains and mass percent are: C0.5-0.8, Si0.8-1.2, Mn0.3-0.5, Ni1-1.2, S < 0.01, P < 0.02, V0.3-0.6, 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 581Mpa to this embodiment valve body material, elongation ∮ is 10.51%, hardness HBS is 230.
Casing rigidity: nominal pressure reaches 1.5 times of 3.35Mpa(operating pressure PN10,60 seconds), sealing property: nominal pressure reaches 2.29Mpa (operating pressure 1.1 times, 30 seconds).
Claims (4)
1. a sewer line soft sealing gate valve valve body, is characterized in that: the chemical element composition that it contains and mass percent thereof are: C2.1-2.4, Sc 0.04-0.07, Si2.5-2.9, Mn2.0-2.6, P < 0.03, S < 0.01, Cr2-3, La0.03-0.05, Ni3.5-3.9, surplus are Fe.
2. sewer line soft sealing gate valve valve body according to claim 1, it is characterized in that this valve body metallographic structure is 50% perlite+50% ferrite, and be the degree of depth of starting point from surface be 15-20mm scope inner tissue be perlite, pearlitic interlamellar spacing is between 100-160nm, in perlite, the ratio of cementite thickness to ferrite thickness is 0.11-0.23, and pearlitic median size is 9-15 μm.
3. the sewer line production method of 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, Mn2.1-2.4, S < 0.01, P < 0.02, Sc0.05-0.08, surplus are Fe, metallographic structure is 60% perlite, 40% ferrite; The chemical element composition that described steel scrap contains and mass percent are: C0.5-0.8, Si0.8-1.2, Mn0.3-0.5, Ni1-1.2, S < 0.01, P < 0.02, V0.3-0.6, surplus are Fe, and its metallographic structure is bainite.
4. the production method of sewer line 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410848730.7A CN104565486A (en) | 2014-12-31 | 2014-12-31 | Sewage pipe soft seal gate valve body and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410848730.7A CN104565486A (en) | 2014-12-31 | 2014-12-31 | Sewage pipe soft seal gate valve body and preparation method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN104565486A true CN104565486A (en) | 2015-04-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410848730.7A Pending CN104565486A (en) | 2014-12-31 | 2014-12-31 | Sewage pipe soft seal gate valve body and preparation method thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103014526A (en) * | 2011-09-27 | 2013-04-03 | 宝山钢铁股份有限公司 | Martensitic stainless steel for valve and manufacturing method thereof |
| CN104195447A (en) * | 2014-08-19 | 2014-12-10 | 张家港市飞浪泵阀有限公司 | Super duplex stainless steel used on pump valve product and preparation method thereof |
| CN104213046A (en) * | 2014-08-05 | 2014-12-17 | 安徽荣达阀门有限公司 | Steel material for hydraulic valve and preparing method of steel material |
-
2014
- 2014-12-31 CN CN201410848730.7A patent/CN104565486A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103014526A (en) * | 2011-09-27 | 2013-04-03 | 宝山钢铁股份有限公司 | Martensitic stainless steel for valve and manufacturing method thereof |
| CN104213046A (en) * | 2014-08-05 | 2014-12-17 | 安徽荣达阀门有限公司 | Steel material for hydraulic valve and preparing method of steel material |
| CN104195447A (en) * | 2014-08-19 | 2014-12-10 | 张家港市飞浪泵阀有限公司 | Super duplex stainless steel used on pump valve product and preparation method thereof |
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Application publication date: 20150429 |