CN1213822C - Non-thermal-resistance cast steel cooling wall and casting method - Google Patents
Non-thermal-resistance cast steel cooling wall and casting method Download PDFInfo
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- CN1213822C CN1213822C CN 01144238 CN01144238A CN1213822C CN 1213822 C CN1213822 C CN 1213822C CN 01144238 CN01144238 CN 01144238 CN 01144238 A CN01144238 A CN 01144238A CN 1213822 C CN1213822 C CN 1213822C
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Abstract
The present invention belongs to the technical field of metallurgy casting, the present invention relates to a casting method which is especially suitable for a non-thermal-resistance cast steel cooling wall. The cooling wall has the composition that a cooling water pipe is cast in a low-carbon cast steel cooling body and is characterized in that a cast steel cooling wall melted by metallurgy is arranged between a cooling wall body and the outer wall of the cooling water pipe. The casting method for the cooling wall comprises a one-time casting forming method and a two-time thickening casting forming method for the inner wall of the cooling water pipe. Compared with the prior art, the steel cast cooling wall and the preparing method thereof of the present invention have the advantages of favorable use effect and service life extension; in particular, a carburization-proof coating is not applied between the cooling wall and the cooling water pipe, and the thermal resistance can not be generated. Thus, the integral heat-conducting performance of the cooling wall is improved.
Description
Technical field:
The invention belongs to the metallurgical casting technical field.More be applicable to and adopt cast steel to make the casting method of blast furnace with no heat resistance type cast steel cooling wall.
Background technology:
In using the blast furnace of cooling wall, all adopt ductile iron cooling stave at present as the main cooling device of body of heater.For the seamless steel pipe that phosphorus content is very low is cast in the cast iron matrix as cooling water pipe, to prevent cast iron carburizing in steel pipe simultaneously, so in the casting technique of cast-iron cooling wall, must scribble anti-carburization coating at the outer surface of seamless steel pipe, cast then, can be coated with in formation between cooling water pipe and the cast iron like this and produce the air gap (air cleft) between lamellar spacing and coating and the cast iron, the existence in these gaps has increased the thermal resistance between cooling water pipe and the cooling wall greatly, has seriously reduced the heat transfer and the cooling effect of cooling wall.Simultaneously because the mechanical property of spheroidal graphite cast-iron, as percentage elongation: differ greatly inside and outside the cooling wall, only be equivalent to half of surperficial percentage elongation, thereby reduced the ability that cast-iron cooling wall bears internal stress at the percentage elongation in cooling wall centre.Have again,, particularly after graphite is oxidized, more aggravated the formation and the expansion of crackle because the globular graphite that distributing in the matrix of cast-iron cooling wall just is equivalent to be covered with crackle spot and crackle extended source in cast iron matrix.
Summary of the invention:
The objective of the invention is to propose a kind of reasonable in design, manufacture method is reliable, and the product result of use is good, can improve the blast furnace cooling device life-span and non-thermal-resistance cast steel cooling wall and the casting method thereof of the life of the blast furnace of prolongation.
According to purpose of the present invention, the solution that we adopted is to replace spheroidal graphite cast-iron by cast steel, its reason is that the present invention selects the material of cast steel cooling wall close with the cooling water pipe material that will be cast in the cooling wall, as mild steel or low-carbon low-alloy steel, because their carbon content is low, therefore being cast into cooling water pipe surface in cast steel cooling wall must not be coated with and wrap up in any anti-carburization coating, so just can effectively eliminate the lamellar spacing that is coated with between cooling water pipe and the cast steel cooling wall, and the air gap between coating and the foundry goods.Owing to eliminated this two-layer thermal resistance, increased substantially the heat-exchange capacity between cooling water and the cooling wall, prolong the service life of cast steel cooling wall.But because the weight of cast steel cooling wall body is far longer than the cooling water pipe weight that is cast in cooling wall, when casting-cooling wall, the molten steel temperature is higher about 100 ℃ than cooling water pipe material fusing point approximately, so probably with the cooling water pipe burn through.The manufacturing technology difficult point of cast steel cooling wall of the present invention is the molten steel fusion that will make cooling water pipe outer surface and cast when casting-cooling wall, again not by burn through, but also will keep the original geometry of cooling water pipe.The no heat resistance type cast steel cooling wall of high temperature furnace body of heater cooling device therefore of the present invention, the composition of this cooling wall is to be cast with cooling water pipe in the low-carbon cast steel cooling body, it is characterized in that the cast steel cooling wall planted agent is cast with the low-carbon steel material seamless pipe of percentage elongation δ 〉=25% and C≤0.23%, and the casting method of this non-thermal-resistance cast steel cooling wall be cast in the body with this cooling wall with the cooling water pipe outer wall be the casting method of metallurgical melting between the two.This high temperature furnace body of heater cooling device casting method of no heat resistance type cast steel cooling wall; be characterised in that it is to adopt cooling wall body and cooling water pipe outer wall to realize the casting and molding method of metallurgical melting that the cast steel cooling wall planted agent is cast with cooling water pipe; its casting method is to adopt the casting method of the cooling water pipe inwall being controlled the cooling forming cooling wall; employing is to the casting cooling wall casting technique of cooling water pipe inwall control cooling; be to be fixed in the mold after the cooling water pipe moulding of hollow sand cores will be housed; be provided with main casting gate in the upper end of mold; casting is to adopt bottom filling; when the casting molten steel; the gas that the hollow feeding flow of core is 3-12m/s in the reply cooling water pipe is controlled cooling protection.In the cast steel cooling wall casting technique, the cooling water pipe wall thickness that is adopted is 6-12mm, and the thickness of cast steel cooling wall body should be 1.8-3.0 times of cooling water pipe external diameter, and the hollow diameter of the core of inserting is the 20-50% of cooling water pipe internal diameter in cooling water pipe.The further feature of casting this cooling wall also has on the cooling water pipe in the cast steel cooling wall casting technique, should have the above tube wall periphery in two places or two places that chill is set.The bottom filling that should evenly be distributed with 2-5 below the main sprue gate on the mold divides cast gate.When casting the bottom filling of taking divide cast gate to be the layout that is uniformly dispersed, except will considering the feeding effect, be also noted that problems such as molten steel heat when casting is evenly distributed for rising head simultaneously.In the cooling water pipe in the cast steel cooling wall casting technique, the hollow sand cores that is equipped with is the ZGS96-42Q-30 casting silica sand and has in the fire-resistant core of collapsibility that high refractoriness becomes reconciled any one.According to the temperature of when casting molten steel, be that nitrogen and airborne any one gas are controlled intensity of cooling to the gas of the hollow feeding of core in the cooling tube, the conduction by hollow sand cores makes the cooling tube inwall reach the purpose of cooling.Insert hollow sand cores and can also prevent the distortion of cooling water pipe at high temperature.Employing increases the casting of its thickness to the cooling water pipe that is cast into cooling wall, the purpose of this operation is when cooling water pipe outer wall and molten steel fusion are thickened, and cooling water pipe should be by burn through and distortion, when its final increase thickness should satisfy this cast steel cooling wall shape casting, molten steel should not make cooling water pipe be as the criterion by burn through and distortion.The no heat resistance type cast steel cooling wall of high temperature furnace body wall that we propose according to foregoing, the composition of this cooling wall is to be cast with cooling water pipe in the low-carbon cast steel cooling wall, it is characterized in that the foundry technology process that thickens the shape casting cooling wall is, cooling water pipe is carried out the non-homogeneous casting that thickens, its technology is to put into mold after cooling water pipe is shaped, adopt bottom pouring type pouring, cooling water pipe casting amount of swelling be should be 0.8-1.8 times of cooling water pipe wall thickness; Be be carried out to mold casting with putting into the moulding mold again, and the molten steel and the cooling water pipe outer surface of casting to be fused in the casting technique that thickens the shape casting cooling wall through the cooling water pipe that thickens.
Further feature in the methods of the invention also has, and in the casting method of this cast steel cooling wall, the temperature of casting is in 1480 ℃ of-1640 ℃ of scopes.The cast steel that this cast steel cooling wall is adopted in casting process is low-carbon cast steel, and its carbon content answers≤0.23%.The cooling water pipe that is cast in addition in the cast steel cooling wall is to adopt the mild steel of C≤0.23% and the seamless steel pipe manufacturing of percentage elongation δ≤25% material.
Though be cast into cooling water pipe in the cast steel cooling wall of the present invention, but the characteristics of this cooling wall are the outer surface of tube wall of cooling water pipe and do not add any coating material, therefore can not produce the heat insulation thermal resistance of coating yet, after adopting casting method of the present invention, can eliminate the air gap between cooling wall body and the cooling water pipe.Used cooling water pipe should be the mild steel of C≤0.23% and the seamless steel pipe of δ 〉=25% material in cast steel cooling wall of the present invention in addition, and the used material of cast steel cooling wall is a low-carbon cast steel, and its carbon content should≤0.23% scope.Because cast steel cooling wall is close with the chemical analysis, mechanics, the physical property that are cast into cooling water pipe, so in casting cycle, the syncretizing effect of cast steel cooling wall and cooling water pipe is fine.There is in the material of cast steel cooling wall of the present invention and cooling water pipe an amount of micro alloying element that adds that the serviceability of cooling wall is increased again, can improves the service life of blast furnace like this.
The preparation method of employing non-thermal-resistance cast steel cooling wall of the present invention compared with prior art, because cooling wall body of the present invention is a mild steel of selecting C≤0.23% for use, and the seamless steel pipe of the mild steel δ of C≤0.23% 〉=25% material, with casting and molding method with to thicken the no heat resistance type cast steel cooling wall result of use of casting method manufacturing good and increase the service life, especially be not coated with between cooling wall and the cooling water pipe and wrap up in any anti-carburization coating, and this physical efficiency of cooling wall realizes that with the cooling water pipe outer surface metallurgical melting becomes as a whole, the thermal resistance that does not exist coating and the air gap to bring has improved the heat conductivility of cooling wall integral body.
Description of drawings:
In the specification of non-thermal-resistance cast steel cooling wall of the present invention, Fig. 1 is the non-thermal-resistance cast steel cooling wall that adopts casting method of the present invention (embodiment 1) preparation.Can find out that from accompanying drawing 1 cast steel cooling wall and cooling water pipe realize that all metallurgical melting becomes whole.Fig. 2 is the cast steel cooling wall of prior art casting method (embodiment 6) preparation.By can seeing obviously in the accompanying drawing 2 that tangible gap is arranged between cooling wall and the cooling water pipe, so the thermal resistance of this cooling wall is inevitable bigger.Different measuring face mean temperature (there is the 65mm bricking on the surface) curve map when Fig. 3 is 1150 ℃ of furnace temperature.In Fig. 1,2: A is the cast steel cooling wall body; B is a cooling water pipe; C is layering between A and the B.Ordinate in Fig. 3 is a temperature, and abscissa is the warm amount face that is equipped with on the a-f cooling wall thickness, and heavy line is (example 5), and the cooling water flow velocity is 1.62mm/s; Fine line is (example 3 examples), and the cooling water flow velocity is 1.06mm/s.
The specific embodiment:
The embodiment of the invention is that the material and the casting method of the cast steel cooling wall according to the present invention formulated; when the material that we select cast steel cooling wall in an embodiment is a carbon content≤0.23% steel grade; also having selected cooling water pipe is the mild steel of C≤0.23% and the seamless cooling water pipe of δ 〉=25% material; manufacture the setting shape according to design by the cooling wall requirement, carry out mold or other preparation section then.In adopting casting method of the present invention, we have formulated the production technology that adapts according to the cooling water pipe pipe thickness.In order to be compared with the prior art conveniently, we have also enumerated the cast iron or the cast steel cooling wall of several contrasts simultaneously.The moulding material of cast steel cooling wall of the present invention and the manufacture of casting technique and prior art compare and see the following form.In contrast table, table 1, be the process of embodiment of the invention shape casting; Table 2, be the process of embodiment of the invention casting; Table 3 is the embodiment of prior art casting method; Table 4 is the product heat transfer contrast table of the embodiment of the invention and prior art embodiment; Table 5 is the cooling wall result of use contrast of the embodiment of the invention and prior art embodiment casting.In each table, sequence number 1,2,3,4 is the embodiment of cast steel cooling wall of the present invention, and sequence number 5,6 is the embodiment of prior art cast steel cooling wall.(embodiment 1) can find out that cast steel cooling wall becomes whole with cooling water pipe metallurgical melting in accompanying drawing 1.Accompanying drawing 2 is (embodiment 6), by seeing among the figure tangible gap is arranged between cooling wall and the cooling water pipe.Different measuring face mean temperature (there is the 65mm bricking on the surface) curve table diagrammatic sketch (embodiment 5) (embodiment 3) when accompanying drawing 3 is 1150 ℃ of furnace temperature.By in above-mentioned comparison and the accompanying drawing 3, each section temperature contrast of embodiment 3 and embodiment 5 thermal modeling tests as can be seen, adopt the prepared cast steel cooling wall of the inventive method, good and the long service life of result of use not only, and reasonable in design, especially need not be coated with between cooling wall and the cooling water pipe and wrap up in any anti-carburization coating, and cooling wall cast steel can well be fused into integral body with cooling water pipe, do not produce the slit thermal resistance, improve the heat-exchange capacity of cooling wall and eliminated the hidden danger that may produce inherent crackle in the cooling wall.
Table 1, be the process of embodiment of the invention shape casting
| Instance number | Cooling wall size length * wide * thick (mm) | Cooling water pipe external diameter * wall thickness quantity | The hollow diameter of core material and core | Ventilation kind and flow velocity | Pouring temperature | Pouring type and cast gate quantity | Cooling wall body and cooling water pipe outer wall fusion situation |
| Example 1 | The dark 451mm material of 1560 * 180 * 120 brick-inlaid grooves is a mild steel | 1 water pipe of φ 52 * 6mm, the outer surface derusting by sandblasting | Core is the hollow diameter phi 15mm of common silica sand (ZGS96-42Q-30) | Feeding nitrogen cooling flow velocity is 4.5m/s | 1612℃ | 4 in 1 branch cast gate of bottom pouring type pouring master cast gate | 70% part realizes metallurgical melting |
| Example 2 | The dark 45mm material of 1560 * 760 * 150 brick-inlaid grooves is a mild steel | 4 water pipes of φ 56 * 8mm, the outer surface derusting by sandblasting | Core is the hollow diameter phi 18mm of common silica sand (ZGS96-42Q-30) | 4 water pipe ventilations of bubbling air cooling flow velocity is 8m/s | 1563℃ | 8 in 2 branch cast gates of bottom pouring type pouring master cast gate | Outer wall of steel pipe and body are realized metallurgical melting |
Table 2, be the process of embodiment of the invention casting
| Instance number | Cooling water pipe external diameter * wall thickness quantity | Cast for the first time the cooling water pipe amount of swelling | Pouring type and cast gate quantity | Pouring temperature | Cast molten steel and cooling water pipe outer wall fusion situation | The appearance and size of shape casting for the second time | The technology of shape casting for the second time | The cooling water pipe outer wall fusion situation of cooling wall body and thickening |
| Example 3 | φ 52 * 6mm length 1360mm material is the derusting by sandblasting of mild steel outer surface | The common silica sand of filling in steel pipe, cooling water pipe circumference uniformly thicken reaches 15mm | 4 at 3 rising heads of 1 branch cast gate of bottom pouring type pouring master cast gate | 1639℃ | 80% part realizes metallurgical melting | Identical with table 1 example 1 finished size | The condition of other process conditions and table 1 is identical except not adding hollow sand cores and ventilation is cooled off in cooling water pipe | The cooling wall body has 70% with top realization metallurgical melting with the cooling water pipe outer wall of process thickening |
| Example 4 | φ 52 * 6mm length 1360mm material is the derusting by sandblasting of mild steel outer surface | The common silica sand of filling in steel pipe, thicken 30mm on the cooling water pipe circumferential width, thicken 20mm on the height | 3 at 4 rising heads of 1 branch cast gate of bottom pouring type pouring master cast gate | 1601℃ | 65% part realizes metallurgical melting | Identical with table 1 example 2 finished sizes |
Table 3 is the embodiment of prior art casting method
| Instance number | Cooling wall size length * wide * thick (mm) | Cooling water pipe external diameter * wall thickness quantity | The cooling water pipe outer surface | Ventilation kind and flow velocity | Pouring temperature | Pouring type and cast gate quantity | Cooling wall body and cooling water pipe outer wall fusion situation |
| Example 5 | Cooling wall body material is the dark 75mm of spheroidal graphite cast-iron 1560 * 760 * 150 brick-inlaid grooves | 4 cooling water pipes of φ 52 * 6mm | The thick Al of outer surface coating 0.25～0.35mm of cooling water pipe 2O 3The material anti-carburization coating | Not to the logical any gas cooled of cooling water pipe | 1420℃ | Side notes formula is poured into a mould 4 in 1 branch cast gate of main cast gate | Cooling water pipe can slide in the cooling wall body, has the 0.3mm gap each other |
| Example 6 | Cooling wall body material is the dark 75mm of mild steel 1560 * 760 * 150 brick-inlaid grooves | 4 cooling water pipes of φ 56 * 8mm | The outer surface of cooling water pipe carries out derusting by sandblasting to be handled | 4 water pipes all feed nitrogen cooling ventilation flow velocity and are 5m/s | 1563℃ | 8 in 2 branch cast gates of bottom pouring type pouring master cast gate | Cooling water pipe and cooling wall body do not fuse part, and its gap is about 0.1mm |
Table 4 is the product heat transfer contrast table of the embodiment of the invention and prior art embodiment
| The test sequence number | Sample | Trial furnace furnace temperature ℃ | The point for measuring temperature temperature (℃) | The cooling water state | Remarks | |||||
| 1 | 2 points | 3 points | 4 points | Flow velocity m/s | Inflow temperature ℃ | The Inlet and outlet water temperature difference ℃ | ||||
| 1-1 | The cast steel cooling wall sample of the technology of the present invention (example 1) | 500.7 | 122.0 | 58.8 | 52.2 | 46.5 | 2.0 | 18.96 | 0.33 | Sample is that cooling water pipe outer wall and cooling wall body are realized metallurgical melting substantially |
| 1-2 | 501.3 | 109.0 | 56.7 | 50.5 | 45.2 | 3.0 | 19.99 | 0.21 | ||
| 1-3 | 501.7 | 101.0 | 56.0 | 50.0 | 45.0 | 4.0 | 20.88 | 0.16 | ||
| 1-4 | 500.2 | 92.7 | 55.5 | 50.0 | 44.7 | 5.0 | 21.90 | 0.12 | ||
| 6-1 | The cast steel cooling wall sample of prior art (example 6) | 500.0 | 145.8 | 63.7 | 57.7 | 48.8 | 2.0 | 29.96 | 0.32 | Sample is the gap that has about 0.1mm between cooling water pipe and the cooling wall body |
| 6-2 | 500.3 | 144.0 | 62.0 | 56.0 | 47.5 | 3.0 | 30.32 | 0.22 | ||
| 6-3 | 500.3 | 143.0 | 61.0 | 55.0 | 46.7 | 4.0 | 30.48 | 0.16 | ||
| 6-4 | 500.7 | 147.8 | 65.8 | 59.8 | 49.3 | 1.5 | 30.80 | 0.45 |
Annotate: the distance of point for measuring temperature and cooling water pipe inner surface is respectively in the table, and point for measuring temperature 1 is 30mm, and point for measuring temperature 2 is that 24mm point for measuring temperature 3 is 16mm, and point for measuring temperature 4 is 8mm
The cooling wall result of use contrast of table 5 the present invention and prior art casting
| Use the kind of cooling wall | Furnace volume and service time | The effect contrast |
| Use the cooling wall that example 2 of the present invention is made | 2580m 3Blast furnace used 3 years 07 months | Example 5 ductile iron cooling staves of installing simultaneously with example 2 cast steel cooling walls have damaged 69, Breakage Reasons is cooling wall matrix serious cracking basically, peels off, cause cooling water pipe exposed and cooling water pipe is damaged, still the brick-inlaid groove of unspoiled ductile iron cooling stave is also ground off a lot. And the profile of example 2 cast steel cooling walls is still intact. Through practical measuring examples 2 years wastes less than 2.7mm, and ductile iron cooling stave year the waste minimum also greater than 18mm. |
| Use the cooling wall that example 6 of the present invention is made | 350m 3Blast furnace is in the time of half a year | When example 6 cast steel cooling walls use four months, because conditions of blast furnace is not normal, ductile iron cooling stave well damage, blast furnace are forced to overhaul discovery: example 5 ductile iron cooling staves adjacent with example 6 cast steel cooling walls, its cooling water pipe have exposed even have broken and leaked. And example 6 cast steel cooling walls except edge by scaling loss, the cooling wall body part does not damage, and has the durable slag crust of one deck at the hot surface of cooling wall, all is not easy to destroy with drill rod. |
Claims (4)
1; a kind of high temperature furnace body of heater cooling device casting method of non-thermal-resistance cast steel cooling wall; the casting method of this cooling wall is to be cast with percentage elongation δ 〉=25% in cast steel cooling wall; the seamless pipe of the low-carbon steel material of C≤0.23%; it is characterized in that this non-thermal-resistance cast steel cooling wall be adopt in cooling wall, be cast into and the cooling water pipe outer wall between the wall casting method that thickens for metallurgical melting; the casting method of this cooling wall is to be fixed in the mold after the cooling water pipe moulding of hollow sand cores is housed; casting is to adopt the cooling water pipe inwall is controlled the casting temperature of cooling in 1480 ℃ of-1640 ℃ of scopes; be provided with main casting gate in the upper end of mold; bottom filling is adopted in casting; the gas that the hollow feeding flow of core is 3-12m/s in adopting cooling water pipe when the casting molten steel is controlled cooling protection; the cooling water pipe wall thickness that this cooling wall adopted is 6-12mm; the body thickness of cooling wall casting should be 1.8-3.0 a times of cooling water pipe external diameter, and the hollow diameter of the hollow sand cores of being inserted in cooling water pipe is the 20-50% of cooling water pipe diameter.
2, according to the casting method of the described no heat resistance type cast steel cooling wall of claim 1, the cooling water pipe tube wall outer periphery that it is characterized in that casting in this cooling wall is equipped with the above chill in two places or two places.
3,, it is characterized in that in the method for this cooling wall of casting cast gate is divided for evenly being distributed with 2-5 bottom filling in the main casting gate below of mold upper end according to the casting method of the described no heat resistance type cast steel cooling wall of claim 1.
4, according to the casting method of the described no heat resistance type cast steel cooling wall of claim 1, it is characterized in that in the method for this cooling wall of casting, be to adopt feeding cooling water pipe to be controlled cooling for nitrogen or airborne any one gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01144238 CN1213822C (en) | 2001-12-14 | 2001-12-14 | Non-thermal-resistance cast steel cooling wall and casting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01144238 CN1213822C (en) | 2001-12-14 | 2001-12-14 | Non-thermal-resistance cast steel cooling wall and casting method |
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| CN1422712A CN1422712A (en) | 2003-06-11 |
| CN1213822C true CN1213822C (en) | 2005-08-10 |
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| CN 01144238 Expired - Fee Related CN1213822C (en) | 2001-12-14 | 2001-12-14 | Non-thermal-resistance cast steel cooling wall and casting method |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104293994B (en) * | 2014-10-29 | 2016-08-24 | 马鞍山市润通冶金材料有限公司 | A kind of casting steel cooling wall in blast furnace and manufacture method thereof |
| CN106925759A (en) * | 2015-12-30 | 2017-07-07 | 中核北方核燃料元件有限公司 | Channel S depleted uranium shielding body casting method |
| CN106735097A (en) * | 2016-11-30 | 2017-05-31 | 邢振国 | A kind of adjustable biliquid casting bimetal composite process of cooling rate |
| CN107254559B (en) * | 2017-06-30 | 2018-12-04 | 马鞍山市润通冶金材料有限公司 | A kind of cooling wall and its processing method |
| CN107083462B (en) * | 2017-06-30 | 2019-03-22 | 马鞍山市润通冶金材料有限公司 | A kind of blast furnace cooling stave and its processing technology that multilayer is cooling |
| CN110814282B (en) * | 2019-10-30 | 2021-09-21 | 本溪钢铁（集团）机械制造有限责任公司 | Method for preparing iron casting with cast-in steel pipe |
| CN113210586B (en) * | 2021-04-29 | 2022-12-06 | 共享装备股份有限公司 | Casting method of low-pressure inner cylinder of steam turbine |
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