CN103255252A - Steel casting big sleeve and preparation method thereof - Google Patents
Steel casting big sleeve and preparation method thereof Download PDFInfo
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- CN103255252A CN103255252A CN2013102069469A CN201310206946A CN103255252A CN 103255252 A CN103255252 A CN 103255252A CN 2013102069469 A CN2013102069469 A CN 2013102069469A CN 201310206946 A CN201310206946 A CN 201310206946A CN 103255252 A CN103255252 A CN 103255252A
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Abstract
The invention belongs to the technical field of iron-smelting blast furnace cooling equipment and discloses a steel casting big sleeve and a preparation method thereof. The steel casting big sleeve is mainly technically characterized by comprising a big sleeve body, wherein the big sleeve body is provided with a cooling water pipe, and the cooling water pipe is connected with a cooling device with a built-in cooling medium through a quick change joint during casting; the cooling water pipe spirally rises in a serpentine manner to form the shape of a truncated cone; and one cooling water pipe is provided. The steel casting big sleeve provided by the invention can take away superheat which is applied by high-temperature molten steel to the cooling water pipe, reduce the superheat temperature of the cooling water pipe during casting and further achieve the state of realizing shallow melting of the outer surface and keeping the internal raw material in a melting but not penetrating situation by utilizing heat convection and heat conduction effects of the flowing liquid cooling medium. The method has the advantages of simplicity in molding, convenience in operation, high finished product rate, low labor intensity of workers, low production cost and long service life of the equipment.
Description
Technical field
The invention belongs to iron-smelting blast furnace cooling apparatus technical field, relate in particular to big cover of a kind of cast steel and preparation method thereof.
Background technology
The cooling apparatus of iron-smelting blast furnace---the traditional processing technology of the big cover of cast steel and analogous products is: adopt complicated conformal internal chill or the method for the compound heat-eliminating medium of solid of packing at outer surface of steel tube in steel pipe, reach the not purpose of burn through and certain fusion rate of steel pipe.Adopt complicated conformal internal chill to have following problem at outer surface of steel tube:
1, internal chill quantity Calculation and actual service requirements gap are bigger, often cause water-cooled tube and body fusion rate instability after the cast; Can there be not molten chill when the chill amount is too much, makes body interior the gap occur, influence the capacity of heat transmission of tuyere big sleeve; Can cause water-cooled tube when the chill amount is very few by burn through and big cover is scrapped;
2, complex process, workload is big, and labor strength is higher;
3, internal chill mostly is fixing in interior cast-steel pipe welding, like this steel pipe is caused severe impairment, causes water pipe to leak in the fusing of weld steel pipe easily during cast.
There is following problem in the compound heat-eliminating medium of solid of packing in steel pipe:
Before cast, pack into the steel pipe of the compound heat-eliminating medium of solid, cast back water pipe internal cleaning difficulty, even cause waste product.Whole technological process is time-consuming, and the compound heat-eliminating medium of solid is the material that heat storage capacity is big, thermal conductivity is good, and cost is higher.
Summary of the invention
First technical problem that the present invention will solve just provides a kind of can the realization and takes away the unlikely burn through of cast-steel pipe in the superheat protection by heat-eliminating medium, and the fusing heat that can satisfy the outer surface of steel tube needs again reaches the big cover of cast steel of certain fusion rate.
For solving above-mentioned first technical problem, the technical solution used in the present invention is: comprise big cover body, overlap greatly and be provided with water-cooled tube in the body that described water-cooled tube is connected with the refrigerating unit of built-in liquid cooling medium by hydraulic quick coupler during casting.
Its additional technical feature is: described water-cooled tube is that snakelike spiraling risen into taper type;
Described water-cooled tube is 1.
Second technical problem that the present invention will solve just provides the preparation method of the big cover of a kind of cast steel.
For solving above-mentioned second technical problem, the technical solution used in the present invention comprises the steps:
The first step is installed water-cooled tube
Bent water-cooled tube by drawing, water-cooled tube has been carried out pressure testing check and rust cleaning, then the water-cooled tube of handling well has been put into casting mold, and carry out secure fixation;
Second step connected water-cooled tube
After the mould assembling, water-cooled tube is connected with the refrigerating unit that has valve and liquid delivery pump with hydraulic quick coupler;
The 3rd step configuration heat-eliminating medium
The metal powders such as aluminium powder of metal oxide powder such as the aluminum oxide powder of the water of 5～9 weight parts, 1～3 weight part, silicon dioxide powder or nonmetal oxide powder, 0.5～1.5 weight part are mixed to charge into refrigerating unit and stir becomes liquid cooling medium;
The 4th step melting, cast
Before the cast, the valve of open cold radiator cooler and liquid delivery pump, liquid cooling medium flow in water-cooled tube with certain speed under certain pressure; Be that 1550 ℃～1600 ℃ high-temperature molten steel injects casting mold by gating system with temperature, the heat of high-temperature molten steel imports liquid cooling medium in the water-cooled tube into by the water-cooled tube tube wall, take away superheat by the flowing fluid heat-eliminating medium, reduce the temperature of water-cooled tube; Constantly the high-temperature molten steel that injects makes the water-cooled tube outside surface reach fusing point and melts, and the water-cooled tube internal surface keeps original performance owing to there being flowing of liquid cooling medium constantly to take away superheat, and the outside surface of water-cooled tube can not continue to inside deeply to melt;
The 5th the step solidify, moulding
Cast finishes, because the cooling effect of liquid cooling medium in the water-cooled tube, the water-cooled tube temperature is very fast by lining and outer reduction, and the water-cooled tube outside surface that is melted is crystallization and freezing again.After treating that cast(ing) surface solidifies crust, close valve and the liquid delivery pump of refrigerating unit, stop the feeding liquid heat-eliminating medium, and as early as possible hydraulic quick coupler and big jacket water pipe are thrown off.Finished the shallow molten and inner technological process that keeps original material and reach certain melting rate of water-cooled tube outside surface, be incubated after 10-15 hour unpacking, the big sleeve forming of cast steel.
The big cover of a kind of cast steel provided by the present invention utilizes thermal convection and the conduction of heat of flowing fluid heat-eliminating medium, and the superheat that high-temperature molten steel is imposed on water-cooled tube is taken out of, thus the temperature of superheat of water-cooled tube when reducing cast.The liquid cooling medium quantity that needs when calculating cast by heat balance theory and the proportioning of liquid cooling medium, determine cooling time, by the combination of Theoretical Calculation and practical proof, finally determine rational liquid cooling medium quantity and proportioning, and determine final cooling time.Teeming temperature can be higher 50～100 ℃ than normal pouring temperature; can realize like this taking away casting cooling water pipe in the superheat protection by heat-eliminating medium, the fusing heat that can satisfy water-cooled tube outside surface needs again reaches molten and does not wear and reach the purpose of certain fusion rate.Its advantage is:
1, need not during moulding to place complicated internal chill, moulding is simple, can guarantee the fusion rate of water-cooled tube and big cover body, thereby has improved the capacity of heat transmission of the big cover of cast steel, has satisfied the service requirements of big cover;
2, equipment is simple, and is easy to operate, and water-cooled tube inside need not cleaning after casting was finished;
3, yield rate height, labor strength reduces;
4, cooling fluid wide material sources, comprehensive production cost is low.
The shallow molten and design requirements of inner maintenance original material in the about 1mm of water-cooled tube outside surface left and right sides when a kind of cast steel provided by the present invention big cover has been realized casting.Heat-eliminating medium be a kind of be the mixture of the additional multiple pressed powder of main raw material with water.After this technical measures were adopted in the production of the big cover of cast steel, water-cooled tube reached design requirements with the fusion rate of big cover body, and the comprehensive capacity of heat transmission of the big cover of cast steel improves greatly, has prolonged the work-ing life of equipment.
Description of drawings
Structural representation when Fig. 1 casts for the big cover of a kind of cast steel of the present invention.
Embodiment
Concrete structure and preparation method to the big cover of a kind of cast steel provided by the present invention is described in further details below in conjunction with accompanying drawing.
As shown in Figure 1, the big cover of a kind of cast steel provided by the present invention comprises big cover body 1, big cover body 1 is provided with water-cooled tube 2, water-cooled tube 2 is connected with refrigerating unit 4 by hydraulic quick coupler 3 during casting, refrigerating unit 4 built-in liquid cooling mediums 5, refrigerating unit 4 has valve 6, liquid delivery pump 7 and stirring pump 8, liquid cooling medium 5 is stirred by stirring pump 8 and is suspension, liquid cooling medium 5 is sent in the water-cooled tube 2 by liquid delivery pump 7, liquid cooling medium 5 is under certain pressure, flow in water-cooled tube 2 with certain speed, water-cooled tube 2 rises into taper type for snakelike spiraling, and water-cooled tube 2 is 1.
The big cover material of cast steel is ZG230-450, the about 850kg of weight, and the main wall thickness 80mm of foundry goods, water-cooled tube are Φ 51 * 8mm weldless steel tube, water pipe material 20 steel;
The big cover of a kind of cast steel provided by the present invention comprises the steps: when preparing
The first step is installed water-cooled tube
Bent water-cooled tube 2 by drawing, water-cooled tube 2 has been carried out pressure testing check and rust cleaning, then the water-cooled tube of handling well 2 has been put into casting mold, and carry out secure fixation;
Second step connected water-cooled tube
After the mould assembling, water-cooled tube 2 usefulness hydraulic quick couplers 3 are connected with the refrigerating unit 4 that has valve 6, liquid delivery pump 7, stirring pump 8;
The 3rd step disposed heat-eliminating medium, determines cooling time
The water of 5 weight parts, the silicon dioxide powder of 1 weight part, the aluminium powder mixing of 0.5 weight part are charged into refrigerating unit 4 and stir the liquid cooling medium 5 of formation suspension by stirring pump 8;
According to wall thickness and the weight of big cover, determine that be 80s cooling time;
The 4th step melting, cast
The molten steel melting is carried out processing such as purification of molten steel, deoxidation to tapping temperature, reach teeming temperature.Before the cast, the valve 6 of open cold radiator cooler 4 and liquid delivery pump 7 make liquid cooling medium 5 enter in the big jacket water pipe 2 with certain pressure and speed; The high-temperature molten steel that with temperature is 1600 ℃ then injects casting mold by gating system, and the heat of high-temperature molten steel imports liquid cooling medium 5 into by water-cooled tube 2, takes away the superheat of water-cooled tube 2 by liquid cooling medium 5, reduces the temperature of water-cooled tube 2; Constantly the high-temperature molten steel that injects makes water-cooled tube 2 outside surfaces reach fusing point and melts, and water-cooled tube 2 internal surfaces keep original performance owing to there being flowing of liquid cooling medium 5 constantly to take away superheat, and the outside surface of water-cooled tube 2 can not continue to inside deeply to melt;
The 5th the step solidify, moulding
Cast finishes, because the cooling effect of liquid cooling medium 5 in the water-cooled tube 2, conduit temperature is by lining and outer the reduction comparatively fast, water-cooled tube 2 outside surfaces that are melted are crystallization and freezing again, time to be cooled is when reaching 80s, close refrigerating unit valve 6 and liquid delivery pump 7, and as early as possible hydraulic quick coupler 3 and big jacket water pipe 2 are thrown off, finished shallow the melting in the about 1mm of the water-cooled tube outside surface left and right sides and the inner technological process that keeps original material and reach certain melting rate, be incubated after 10 hours and unpack the big sleeve forming of cast steel.
The big cover material of cast steel is ZG270-500, the about 1100kg of weight, and the main wall thickness 100mm of foundry goods, water-cooled tube are Φ 60 * 8mm weldless steel tube, water pipe material 20 steel;
The big cover of a kind of cast steel provided by the present invention comprises the steps: when preparing
The first step is installed water-cooled tube
Bent water-cooled tube 2 by drawing, water-cooled tube 2 has been carried out pressure testing check and rust cleaning, then the water-cooled tube of handling well 2 has been put into casting mold, and carry out secure fixation;
Second step connected water-cooled tube
After the mould assembling, water-cooled tube 2 usefulness hydraulic quick couplers 3 are connected with the refrigerating unit 4 that has valve 6, liquid delivery pump 7, stirring pump 8;
The 3rd step disposed heat-eliminating medium, determines cooling time
The water of 7 weight parts, the aluminum oxide powder of 2 weight parts, the aluminium powder mixing of 1 weight part are charged into refrigerating unit 4 and stir the liquid cooling medium 5 of formation suspension by stirring pump 8;
According to wall thickness and the weight of big cover, determine that be 100s cooling time;
The 4th step melting, cast
The molten steel melting is carried out processing such as purification of molten steel, deoxidation to tapping temperature, reach teeming temperature.Before the cast, the valve 6 of open cold radiator cooler 4 and liquid delivery pump 7 make liquid cooling medium 5 enter in the big jacket water pipe 2 with certain pressure and speed; Be that 1575 ℃ high-temperature molten steel injects casting mold by gating system with temperature, the heat of high-temperature molten steel imports liquid cooling medium 5 into by water-cooled tube 2, takes away the superheat of water-cooled tube 2 by liquid cooling medium 5, reduces the temperature of water-cooled tube 2; Constantly the high-temperature molten steel that injects makes water-cooled tube 2 outside surfaces reach fusing point and melts, and water-cooled tube 2 internal surfaces keep original performance owing to there being flowing of liquid cooling medium 5 constantly to take away superheat, and the outside surface of water-cooled tube 2 can not continue to inside deeply to melt;
The 5th the step solidify, moulding
Cast finishes, because the cooling effect of liquid cooling medium 5 in the water-cooled tube 2, conduit temperature is by lining and outer the reduction comparatively fast, water-cooled tube 2 outside surfaces that are melted are crystallization and freezing again, and the time to be cooled is closed refrigerating unit valve 6 and liquid delivery pump 7 when reaching 100s, hydraulic quick coupler 3 and water-cooled tube 2 are thrown off, finished the shallow molten and inner technological process that keeps original material and reach certain melting rate in the about 1mm of the water-cooled tube outside surface left and right sides, be incubated after 12.5 hours unpacking, the big sleeve forming of cast steel.
The big cover material of cast steel is ZG230-450, weight 1200Kg, and the main wall thickness of foundry goods is 90mm, water-cooled tube is Φ 60 * 8mm; The big cover of a kind of cast steel provided by the present invention comprises the steps: when preparing
The first step is installed water-cooled tube
Bent water-cooled tube 2 by drawing, water-cooled tube 2 has been carried out pressure testing check and rust cleaning, then the water-cooled tube of handling well 2 has been put into casting mold, and carry out secure fixation;
Second step connected water-cooled tube
After the mould assembling, water-cooled tube 2 usefulness hydraulic quick couplers 3 are connected with the refrigerating unit 4 that has valve 6, liquid delivery pump 7, stirring pump 8;
The 3rd step disposed heat-eliminating medium, determines cooling time
The water of 9 weight parts, the silicon dioxide powder of 2 weight parts, the aluminum oxide powder of 1 weight part, the aluminium powder mixing of 1.5 weight parts are charged into refrigerating unit 4 and stir the liquid cooling medium 5 of formation suspended state by stirring pump 8;
According to wall thickness and the weight of big cover, determine that be 120s cooling time;
The 4th step melting, cast
The molten steel melting is carried out processing such as purification of molten steel, deoxidation to tapping temperature, reach teeming temperature.Before the cast, the valve 6 of open cold radiator cooler 4 and liquid delivery pump 7 make liquid cooling medium 5 enter in the big jacket water pipe 2 with certain pressure and speed; Be that 1550 ℃ high-temperature molten steel injects casting mold by gating system with temperature, the heat of high-temperature molten steel imports the liquid cooling medium 5 in the water-cooled tube 2 into, takes away the superheat of water-cooled tube 2 by flowing fluid heat-eliminating medium 5, reduces the temperature of water-cooled tube 2; Constantly the high-temperature molten steel that injects makes water-cooled tube 2 outside surfaces reach fusing point and melts, and water-cooled tube 2 internal surfaces keep original performance owing to there being flowing of liquid cooling medium 5 constantly to take away superheat, and the outside surface of water-cooled tube 2 can not continue to inside deeply to melt;
The 5th the step solidify, moulding
Cast finishes, because the cooling effect of liquid cooling medium 5 in the water-cooled tube 2, conduit temperature is by lining and outer the reduction comparatively fast, water-cooled tube 2 outside surfaces that are melted are crystallization and freezing again, and the time to be cooled is closed refrigerating unit valve 6 and liquid delivery pump 7 when reaching 120s, hydraulic quick coupler 3 and water-cooled tube 2 are thrown off, finished the shallow molten and inner technological process that keeps original material and reach certain melting rate in the about 1mm of the water-cooled tube outside surface left and right sides, be incubated after 15 hours unpacking, the big sleeve forming of cast steel.
The big cover of a kind of cast steel provided by the present invention utilizes thermal convection and the conduction of heat of flowing fluid heat-eliminating medium 5, and the superheat that high-temperature molten steel is imposed on water-cooled tube 2 is taken out of, thus the temperature of superheat of water-cooled tube 2 when reducing cast.The quantity of the liquid cooling medium 5 that needs in the time of can calculating cast by heat balance theory and the proportioning of liquid cooling medium 5, determine final cooling time, by the combination of Theoretical Calculation and practical proof, finally determine quantity and the proportioning of rational liquid cooling medium 5, determine cooling time.Teeming temperature can be higher 50～100 ℃ than normal pouring temperature; can realize like this taking away casting cooling water pipe 2 in the superheat protection by liquid cooling medium 5; can satisfy the fusion heat of water-cooled tube outside surface needs again, not wear and reach the design requirements of certain fusion rate thereby the realization water-cooled tube is molten.The present invention is truly feasible through the production practice checking.
The big cover of a kind of cast steel provided by the present invention is not limited only to said structure, but no matter be which kind of form, as long as be cast with the steel casting of the structure formation of imbedding steel pipe in the foundry goods, all falls into the protection domain of patent of the present invention.
Claims (4)
1. the big cover of cast steel comprises big cover body, overlaps body greatly and is provided with water-cooled tube, it is characterized in that: be connected with the refrigerating unit of built-in liquid cooling medium by hydraulic quick coupler when described water-cooled tube is cast.
2. the big cover of a kind of cast steel according to claim 1, it is characterized in that: described water-cooled tube is that snakelike spiraling risen into taper type.
3. the big cover of a kind of cast steel according to claim 1, it is characterized in that: described water-cooled tube is 1.
4. the preparation method of claim 1, the big cover of 2 or 3 described a kind of cast steels is characterized in that comprising the steps:
The first step is installed water-cooled tube
Bent water-cooled tube by drawing, water-cooled tube has been carried out pressure testing check and rust cleaning, then the water-cooled tube of handling well has been put into casting mold, and carry out secure fixation;
Second step connected water-cooled tube
After the mould assembling, water-cooled tube is connected with the refrigerating unit that has valve and liquid delivery pump with hydraulic quick coupler;
The 3rd step configuration heat-eliminating medium
The metal powders such as aluminium powder of metal oxide powder such as the aluminum oxide powder of the water of 5～9 weight parts, 1～3 weight part, silicon dioxide powder or nonmetal oxide powder, 0.5～1.5 weight part are mixed to charge into refrigerating unit and stir becomes liquid cooling medium;
The 4th step melting, cast
Before the cast, the valve of open cold radiator cooler and liquid delivery pump, liquid cooling medium flow in water-cooled tube with certain speed under certain pressure; Be that 1550 ℃～1600 ℃ high-temperature molten steel injects casting mold by gating system with temperature, the heat of high-temperature molten steel imports liquid cooling medium in the water-cooled tube into by the water-cooled tube tube wall, take away superheat by the flowing fluid heat-eliminating medium, reduce the temperature of water-cooled tube; Constantly the high-temperature molten steel that injects makes the water-cooled tube outside surface reach fusing point and melts, and the water-cooled tube internal surface keeps original performance owing to there being flowing of liquid cooling medium constantly to take away superheat, and the outside surface of water-cooled tube can not continue to inside deeply to melt;
The 5th the step solidify, moulding
Cast finishes, because the cooling effect of liquid cooling medium in the water-cooled tube, the water-cooled tube temperature is very fast by lining and outer reduction, and the water-cooled tube outside surface that is melted is crystallization and freezing again; After treating that cast(ing) surface solidifies crust, close valve and the liquid delivery pump of refrigerating unit, stop the feeding liquid heat-eliminating medium, and as early as possible hydraulic quick coupler and big jacket water pipe are thrown off; Finished the shallow molten and inner technological process that keeps original material and reach certain melting rate of water-cooled tube outside surface, be incubated after 10-15 hour unpacking, the big sleeve forming of cast steel.
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| CN201310206946.9A CN103255252B (en) | 2013-05-30 | 2013-05-30 | Steel casting big sleeve and preparation method thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101693931A (en) * | 2009-10-22 | 2010-04-14 | 中冶赛迪工程技术股份有限公司 | Cooling device at tuyere part of blast furnace |
| CN101767243A (en) * | 2008-12-30 | 2010-07-07 | 上海宝冶建设有限公司 | Method for welding tuyere-cooler casing and blast furnace casing |
| CN202532889U (en) * | 2012-04-28 | 2012-11-14 | 河北天宇高科冶金铸造有限公司 | Cast steel cooling wall |
-
2013
- 2013-05-30 CN CN201310206946.9A patent/CN103255252B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101767243A (en) * | 2008-12-30 | 2010-07-07 | 上海宝冶建设有限公司 | Method for welding tuyere-cooler casing and blast furnace casing |
| CN101693931A (en) * | 2009-10-22 | 2010-04-14 | 中冶赛迪工程技术股份有限公司 | Cooling device at tuyere part of blast furnace |
| CN202532889U (en) * | 2012-04-28 | 2012-11-14 | 河北天宇高科冶金铸造有限公司 | Cast steel cooling wall |
Non-Patent Citations (1)
| Title |
|---|
| 沈猛等: "高炉用铸铁（钢）冷却壁制造技术", 《2012中国（唐山）绿色钢铁高峰论坛》 * |
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Effective date of registration: 20211129 Address after: No. 58, Fumin Branch Road, Hengsha Township, Chongming District, Shanghai, 201914 (Shanghai Hengtai Economic Development Zone) Patentee after: Tanyu Metallurgical Technology (Shanghai) Co.,Ltd. Address before: 062350 one kilometer south of Suning County, Cangzhou City, Hebei Province Patentee before: HEBEI TIANYU HIGH-TECH METALLURGICAL CASTING Co.,Ltd. |