CN104805372A - Manufacture technology of high-temperature resistant check valve - Google Patents
Manufacture technology of high-temperature resistant check valve Download PDFInfo
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- CN104805372A CN104805372A CN201510192586.0A CN201510192586A CN104805372A CN 104805372 A CN104805372 A CN 104805372A CN 201510192586 A CN201510192586 A CN 201510192586A CN 104805372 A CN104805372 A CN 104805372A
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Abstract
The invention discloses a manufacture technology of a high-temperature resistant check valve. The manufacture technology comprises the following steps: step (1), smelting, wherein the smelting temperature is 1160-1180 DEG C; step (2), refining, raising the temperature to 1410-1430 DEG C, blowing nitrogen, stirring for 20-22 min, decreasing the furnace temperature to 1240-1260 DEG C, and preserving the temperature for 45-75 min; step (3), shifting ladle for inoculation, adding an inoculant into a transferring ladle, pouring molten iron to enable the nucleating agent to uniformly smelt, and adopting a covering agent to cover the molten iron, wherein the nucleating agent accounts for 1.5% of the molten iron in weight, and the covering agent accounts for 1.3% of the molten iron in weight; step (4), moulding by casting. The high-temperature resistant check valve is excellent in strength, high in hardness, strong acid and strong base resistance, corrosion resistance, and long in service life, unlikely to crack under high temperature, and unlikely to age.
Description
Technical field
The invention belongs to technical field of hydraulic equipment, relate to a kind of hydraulic pressure fuel tap, particularly a kind of manufacturing process of high temperature resistant vacuum breaker.
Background technology
Valve is function unit in pipeline fluid delivery system, and it is used to change path section and medium flowing direction, has the functions such as water conservancy diversion, cut-off, throttling, non-return, shunting or overflow release.In the technical support that valve is produced and researched and developed, state's inner valve falls behind unlike external valve, and products a lot of on the contrary can compare favourably with international business in technology and innovation, and the development of domestic valve industry moves ahead toward the direction of high-end modern.
Under industrialization, urbanization, reform and globalization four great promote, China's valve equipment manufacture prospect or broad, following valve industry high-endization, production domesticization, will be that valve industry will develop Main way from now at modernization.Pursue constantly innovation, for valve enterprise creates the market made new advances, enterprise could be allowed to seek survival in increasingly competitive pump valve industry spring tide, try for the development.Along with the development of valve gate technology, constantly widening of valve applications field, valve standard corresponding is with it also more and more indispensable.In the period of valve industry product introduction one innovation, not only product category needs to update, and enterprise internal management also needs to deepen reforms according to the standard of industry.Therefore, need, while fully using existing standard, to look forward to the future, work out and can apply to new standard in the future and new system, thus the development that propulsion valve technology is higher level.
Summary of the invention
Technical problem to be solved by this invention is, overcomes the shortcoming of prior art, and provide a kind of manufacturing process of high temperature resistant vacuum breaker, product strength of the present invention is good, and hardness is large, and strong alkali-acid resistance corrosion, not easily strain cracking under high temperature, not with aging, and long service life.
In order to solve above technical problem, the invention provides a kind of manufacturing process of high temperature resistant vacuum breaker, the weight percent chemical composition of selection foundry goods is: Cr:6.7-6.9%, Ni:1.23-1.25%, N:0.12-0.14%, C:0.11-0.13%, Mo:0.52-0.55%, Cu:0.34-0.36%, Al:0.51-0.53%, V:0.77-0.81%, W:0.65-0.85%, Si:0.59-0.63%, Mn:0.74-0.76%, Nb:0.11-0.12%, Ti:0.23-0.25%, Ca:0.08-0.12%, Sn:0.07-0.09%, S:0.005-0.010%, P:0.005-0.015%, all the other are Fe and inevitable impurity, comprise following concrete steps:
Step (1): melting, by foundry iron and steel scrap foundry goods and flux input process furnace, smelting temperature is 1160-1180 DEG C, when casting feedstock turns to liquid molten iron, adds the insulating covering agent accounting for weight of molten iron per-cent 2.3%;
Step (2): refining, is increased to 1410-1430 DEG C by temperature, nitrogen blowing stirs 20-22min, and then furnace temperature is down to 1240-1260 DEG C, insulation 45-75min;
Step (3): ladle-to-ladlely to breed, by account for weight of molten iron per-cent be 1.5% nucleating agent add in transhipment bag, then pour molten iron, make its uniform melt, then by account for weight of molten iron per-cent be 1.3% insulating covering agent molten iron is covered;
Step (4): casting, add the nucleating agent accounting for weight of molten iron per-cent 1.2%, control temperature is 1280-1300 DEG C, pours into a mould with the speed of 60-62Kg/min.
The technical scheme that the present invention limits further is:
The invention provides a kind of manufacturing process of high temperature resistant vacuum breaker, the weight percent chemical composition of selection foundry goods is: Cr:6.7%, Ni:1.23%, N:0.12%, C:0.11%, Mo:0.52%, Cu:0.34%, Al:0.51%, V:0.77%, W:0.65%, Si:0.59%, Mn:0.74%, Nb:0.11%, Ti:0.23%, Ca:0.08%, Sn:0.07%, S:0.005%, P:0.005%, all the other are Fe and inevitable impurity.
The invention provides a kind of manufacturing process of high temperature resistant vacuum breaker, the weight percent chemical composition of selection foundry goods is: Cr:6.9%, Ni:1.25%, N:0.14%, C:0.13%, Mo:0.55%, Cu:0.36%, Al:0.53%, V:0.81%, W:0.85%, Si:0.63%, Mn:0.76%, Nb:0.12%, Ti:0.25%, Ca:0.12%, Sn:0.09%, S:0.010%, P:0.015%, all the other are Fe and inevitable impurity.
The invention provides a kind of manufacturing process of high temperature resistant vacuum breaker, the weight percent chemical composition of selection foundry goods is: Cr:6.8%, Ni:1.24%, N:0.13%, C:0.12%, Mo:0.54%, Cu:0.35%, Al:0.52%, V:0.79%, W:0.75%, Si:0.61%, Mn:0.75%, Nb:0.11%, Ti:0.24%, Ca:0.10%, Sn:0.08%, S:0.008%, P:0.010%, all the other are Fe and inevitable impurity.
Further,
Aforementioned flux is lime or slaked lime.
Aforementioned insulating covering agent is pearlstone or expanded graphite.
The mass percent composition of aforementioned nucleating agent is: Si:85-88%, AL:0.5-0.7%, and all the other are inevitable impurity.
The invention has the beneficial effects as follows:
The insulating covering agent that the present invention selects is the one in pearlstone or expanded graphite, obviously can extend rising head top investing time, molten iron in rising head is made to be under barometric point effect for a long time, substantially increase the feeding efficiency of rising head, be conducive to the gas in foundry goods and inclusion floating, reach the object of purify hot metal, and obtain sound foundry goods, reduce scrap rate.
Lime or slaked lime, as flux, form fusible slag with the impurity in iron ore or molten iron, are separated by impurity from iron, thus improve the quality of the pig iron; Meanwhile, in steelmaking process flux be desulfurization, dephosphorization, deoxidation and remove various non-metallic inclusion, improve molten steel cleanliness and reduce the indispensable slag making materials of thermosteresis; Generally, the fusing point of slag phase compound or mixture is all low than the fusing point of reactant, therefore becomes meltable after high-melting-point impurity slagging, thus reaches the object that metal is separated with slag.
The use of nucleating agent, not only prevent the Be very effective of spoken parts in traditional operas, the time length is long, and proportion is easy to more greatly dissolve, and its product quantity of slag is few, can extend the life-span of furnace wall; Physical strength is large, and the effect of deoxidation, desulfurization is strong, can improve the mobility of molten iron; Reduce depression to generate simultaneously, improve foundry goods machinability.
Product strength of the present invention is good, and hardness is large, and strong alkali-acid resistance corrosion, not easily strain cracking under high temperature, not with aging, and long service life.
Embodiment
embodiment
1
The present embodiment provides a kind of manufacturing process of high temperature resistant vacuum breaker, and the weight percent chemical composition of selection foundry goods is: Cr:6.7%, Ni:1.23%, N:0.12%, C:0.11%, Mo:0.52%, Cu:0.34%, Al:0.51%, V:0.77%, W:0.65%, Si:0.59%, Mn:0.74%, Nb:0.11%, Ti:0.23%, Ca:0.08%, Sn:0.07%, S:0.005%, P:0.005%, all the other are Fe and inevitable impurity, comprise following concrete steps:
Step (1): melting, by foundry iron and steel scrap foundry goods and flux input process furnace, smelting temperature is 1160 DEG C, when casting feedstock turns to liquid molten iron, adds the insulating covering agent accounting for weight of molten iron per-cent 2.3%;
Step (2): refining, is increased to 1410 DEG C by temperature, nitrogen blowing stirs 22min, and then furnace temperature is down to 1240 DEG C, insulation 75min;
Step (3): ladle-to-ladlely to breed, by account for weight of molten iron per-cent be 1.5% nucleating agent add in transhipment bag, then pour molten iron, make its uniform melt, then by account for weight of molten iron per-cent be 1.3% insulating covering agent molten iron is covered;
Step (4): casting, add the nucleating agent accounting for weight of molten iron per-cent 1.2%, control temperature is 1280 DEG C, pours into a mould with the speed of 60Kg/min.
Aforementioned flux is lime; Aforementioned insulating covering agent is pearlstone; The mass percent composition of aforementioned nucleating agent is: Si:85%, AL:0.5%, and all the other are inevitable impurity.
embodiment
2
The present embodiment provides a kind of manufacturing process of high temperature resistant vacuum breaker, and the weight percent chemical composition of selection foundry goods is: Cr:6.9%, Ni:1.25%, N:0.14%, C:0.13%, Mo:0.55%, Cu:0.36%, Al:0.53%, V:0.81%, W:0.85%, Si:0.63%, Mn:0.76%, Nb:0.12%, Ti:0.25%, Ca:0.12%, Sn:0.09%, S:0.010%, P:0.015%, all the other are Fe and inevitable impurity, comprise following concrete steps:
Step (1): melting, by foundry iron and steel scrap foundry goods and flux input process furnace, smelting temperature is 1180 DEG C, when casting feedstock turns to liquid molten iron, adds the insulating covering agent accounting for weight of molten iron per-cent 2.3%;
Step (2): refining, is increased to 1430 DEG C by temperature, nitrogen blowing stirs 20min, and then furnace temperature is down to 1260 DEG C, insulation 45min;
Step (3): ladle-to-ladlely to breed, by account for weight of molten iron per-cent be 1.5% nucleating agent add in transhipment bag, then pour molten iron, make its uniform melt, then by account for weight of molten iron per-cent be 1.3% insulating covering agent molten iron is covered;
Step (4): casting, add the nucleating agent accounting for weight of molten iron per-cent 1.2%, control temperature is 1300 DEG C, pours into a mould with the speed of 62Kg/min.
Aforementioned flux is slaked lime; Aforementioned insulating covering agent is expanded graphite; The mass percent composition of aforementioned nucleating agent is: Si:88%, AL:0.7%, and all the other are inevitable impurity.
embodiment
3
The present embodiment provides a kind of manufacturing process of high temperature resistant vacuum breaker, and the weight percent chemical composition of selection foundry goods is: Cr:6.8%, Ni:1.24%, N:0.13%, C:0.12%, Mo:0.54%, Cu:0.35%, Al:0.52%, V:0.79%, W:0.75%, Si:0.61%, Mn:0.75%, Nb:0.11%, Ti:0.24%, Ca:0.10%, Sn:0.08%, S:0.008%, P:0.010%, all the other are Fe and inevitable impurity, comprise following concrete steps:
Step (1): melting, by foundry iron and steel scrap foundry goods and flux input process furnace, smelting temperature is 1170 DEG C, when casting feedstock turns to liquid molten iron, adds the insulating covering agent accounting for weight of molten iron per-cent 2.3%;
Step (2): refining, is increased to 1420 DEG C by temperature, nitrogen blowing stirs 21min, and then furnace temperature is down to 1250 DEG C, insulation 55min;
Step (3): ladle-to-ladlely to breed, by account for weight of molten iron per-cent be 1.5% nucleating agent add in transhipment bag, then pour molten iron, make its uniform melt, then by account for weight of molten iron per-cent be 1.3% insulating covering agent molten iron is covered;
Step (4): casting, add the nucleating agent accounting for weight of molten iron per-cent 1.2%, control temperature is 1290 DEG C, pours into a mould with the speed of 61Kg/min.
Aforementioned flux is lime; Aforementioned insulating covering agent is pearlstone; The mass percent composition of aforementioned nucleating agent is: Si:87%, AL:0.6%, and all the other are inevitable impurity.
Above embodiment is only and technological thought of the present invention is described, can not limit protection scope of the present invention with this, and every technological thought proposed according to the present invention, any change that technical scheme basis is done, all falls within scope.
Claims (7)
1. the manufacturing process of a high temperature resistant vacuum breaker, it is characterized in that, the weight percent chemical composition of selection foundry goods is: Cr:6.7-6.9%, Ni:1.23-1.25%, N:0.12-0.14%, C:0.11-0.13%, Mo:0.52-0.55%, Cu:0.34-0.36%, Al:0.51-0.53%, V:0.77-0.81%, W:0.65-0.85%, Si:0.59-0.63%, Mn:0.74-0.76%, Nb:0.11-0.12%, Ti:0.23-0.25%, Ca:0.08-0.12%, Sn:0.07-0.09%, S:0.005-0.010%, P:0.005-0.015%, all the other are Fe and inevitable impurity, comprise following concrete steps:
Step (1): melting, by foundry iron and steel scrap foundry goods and flux input process furnace, smelting temperature is 1160-1180 DEG C, when casting feedstock turns to liquid molten iron, adds the insulating covering agent accounting for weight of molten iron per-cent 2.3%;
Step (2): refining, is increased to 1410-1430 DEG C by temperature, nitrogen blowing stirs 20-22min, and then furnace temperature is down to 1240-1260 DEG C, insulation 45-75min;
Step (3): ladle-to-ladlely to breed, by account for weight of molten iron per-cent be 1.5% nucleating agent add in transhipment bag, then pour molten iron, make its uniform melt, then by account for weight of molten iron per-cent be 1.3% insulating covering agent molten iron is covered;
Step (4): casting, add the nucleating agent accounting for weight of molten iron per-cent 1.2%, control temperature is 1280-1300 DEG C, pours into a mould with the speed of 60-62Kg/min.
2. the manufacturing process of high temperature resistant vacuum breaker according to claim 1, is characterized in that, the weight percent chemical composition of selection foundry goods is: Cr:6.7%, Ni:1.23%, N:0.12%, C:0.11%, Mo:0.52%, Cu:0.34%, Al:0.51%, V:0.77%, W:0.65%, Si:0.59%, Mn:0.74%, Nb:0.11%, Ti:0.23%, Ca:0.08%, Sn:0.07%, S:0.005%, P:0.005%, all the other are Fe and inevitable impurity.
3. the manufacturing process of high temperature resistant vacuum breaker according to claim 1, is characterized in that, the weight percent chemical composition of selection foundry goods is: Cr:6.9%, Ni:1.25%, N:0.14%, C:0.13%, Mo:0.55%, Cu:0.36%, Al:0.53%, V:0.81%, W:0.85%, Si:0.63%, Mn:0.76%, Nb:0.12%, Ti:0.25%, Ca:0.12%, Sn:0.09%, S:0.010%, P:0.015%, all the other are Fe and inevitable impurity.
4. the manufacturing process of high temperature resistant vacuum breaker according to claim 1, is characterized in that, the weight percent chemical composition of selection foundry goods is: Cr:6.8%, Ni:1.24%, N:0.13%, C:0.12%, Mo:0.54%, Cu:0.35%, Al:0.52%, V:0.79%, W:0.75%, Si:0.61%, Mn:0.75%, Nb:0.11%, Ti:0.24%, Ca:0.10%, Sn:0.08%, S:0.008%, P:0.010%, all the other are Fe and inevitable impurity.
5. based on the manufacturing process of the high temperature resistant vacuum breaker described in the arbitrary claim of claim 1-4, it is characterized in that, described flux is lime or slaked lime.
6. based on the manufacturing process of the high temperature resistant vacuum breaker described in the arbitrary claim of claim 1-4, it is characterized in that, described insulating covering agent is pearlstone or expanded graphite.
7. based on the manufacturing process of the high temperature resistant vacuum breaker described in the arbitrary claim of claim 1-4, it is characterized in that, the mass percent composition of described nucleating agent is: Si:85-88%, AL:0.5-0.7%, and all the other are inevitable impurity.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510192586.0A CN104805372A (en) | 2015-04-22 | 2015-04-22 | Manufacture technology of high-temperature resistant check valve |
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| CN201510192586.0A CN104805372A (en) | 2015-04-22 | 2015-04-22 | Manufacture technology of high-temperature resistant check valve |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003073726A (en) * | 2001-08-29 | 2003-03-12 | Daido Steel Co Ltd | METHOD FOR MANUFACTURING LOW Ti STEEL |
| JP2005113184A (en) * | 2003-10-06 | 2005-04-28 | Nippon Steel Corp | High strength silicon steel sheet, and its production method |
| CN102268586A (en) * | 2011-07-31 | 2011-12-07 | 蚌埠市鸿申天然气工程成套设备有限责任公司 | Corrosion-resistant alloy cast iron and preparation method thereof |
| CN103993241A (en) * | 2014-05-30 | 2014-08-20 | 秦皇岛首秦金属材料有限公司 | Hot-rolled flat plate for composite acid-resistant pipeline steel base and production method thereof |
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2015
- 2015-04-22 CN CN201510192586.0A patent/CN104805372A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003073726A (en) * | 2001-08-29 | 2003-03-12 | Daido Steel Co Ltd | METHOD FOR MANUFACTURING LOW Ti STEEL |
| JP2005113184A (en) * | 2003-10-06 | 2005-04-28 | Nippon Steel Corp | High strength silicon steel sheet, and its production method |
| CN102268586A (en) * | 2011-07-31 | 2011-12-07 | 蚌埠市鸿申天然气工程成套设备有限责任公司 | Corrosion-resistant alloy cast iron and preparation method thereof |
| CN103993241A (en) * | 2014-05-30 | 2014-08-20 | 秦皇岛首秦金属材料有限公司 | Hot-rolled flat plate for composite acid-resistant pipeline steel base and production method thereof |
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Application publication date: 20150729 |