CN101774010B - Bimetallic metallurgical composite wear-resisting tube blank and manufacturing method thereof - Google Patents
Bimetallic metallurgical composite wear-resisting tube blank and manufacturing method thereof Download PDFInfo
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- CN101774010B CN101774010B CN2010101027836A CN201010102783A CN101774010B CN 101774010 B CN101774010 B CN 101774010B CN 2010101027836 A CN2010101027836 A CN 2010101027836A CN 201010102783 A CN201010102783 A CN 201010102783A CN 101774010 B CN101774010 B CN 101774010B
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Abstract
The invention discloses a method for manufacturing a bimetallic metallurgical composite wear-resisting tube blank, which comprises the following steps: firstly, spraying a water-based zircon powder coating onto a metal tube die after being baked to between 200 and 300 DEG C, wherein the spraying thickness is 1.0 to 3.0mm; secondly, centrifugally casting external liquid metal on the metal tube die after being baked to between 200 and 350 DEG C, cooling the metal tube die after casting, beginning to cast internal liquid metal into the metal tube die when an internal surface temperature of the outer layer is cooled to a temperature lower than a solidus temperature of the external metal; and finally, pouring the internal liquid metal into the metal tube die for centrifugal casting, cooling the metal tube die after casting, and stopping cooling when the outer layer and the inner layer are completely solidified, then the outer layer and the inner layer are metallurgically fused completely, wherein the outer layer is made of a plain carbon steel material or a low-alloy high-strength steel material and the inner layer is made of a high-chromium white cast iron material. The invention also discloses the bimetallic metallurgical composite wear-resisting tube blank manufactured by the method. The outer-layer metal and the inner-layer metal of the tube blank manufactured by the method can be metallurgically fused completely; the qualification rate is improved; and the use safety is high.
Description
Technical field
The present invention relates to the metal casting forming field, especially a kind of bimetallic metallurgical composite wear-resisting tube blank and production method thereof.
Background technology
X/ high-chromium white cast iron composite bimetal pipe is mainly used in the middle of the mining industries such as colliery, gold mine, copper mine, iron ore, phosphate ore, potassium sulfate ore deposit, and the tubing that is used for some conveying solid substance materials.Wherein X refers to straight carbon steel or Hi-Stren steel material, as 14MnV, 16MnV; High-chromium white cast iron is anti abrasive white cast-iron alloy material (as a grade of steel such as KmTBCr20Mo2Cu1, KmTBCr26 among the GB8263-87), difference according to instructions for use can be done suitable adjustment to its composition, and this material generally is used for the vulnerable part of industries such as mine, metallurgy, electric power, building materials and machinery.The wear-resisting pipe of extensive use at present generally has two kinds: 1) the wear-resisting pipe of liner rich chromium cast iron: the wear-resisting outer tube layer of this kind adopts common finished product carbon steel pipes, pour into a mould the internal layer rich chromium cast iron with carbon steel pipes as pipe die at low temperatures, form the wear-resisting pipe of liner rich chromium cast iron, because casting process ectomesoderm temperature is lower, metallurgical binding can not take place in ectonexine, therefore adopt the wear-resisting pipe of this moulding process moulding to exist inside and outside lamination, internal layer fragility rich chromium cast iron can not get the supporting role of outer carbon steel, break easily, bulk strength is lower.2) the biliquid cast forms bimetal composite wear resistant tube: this moulding process is the patent of CN 1759956A " method of manufacturing bimetal composite wear resistant tube through centrifugal molding double fluids " referring to publication number, this technology is same to adopt centrifugal biliquid cast, its roughly step be: 1. the volume ratio by water and graphite powder is 1: 0.3-1.0 prepares water-based graphite coating and is sprayed at the pipe die inner surface; 2. with the outer molten steel of cast behind the flame oven dry mould pipe internal surface coating; 3. after to be cooled the solidifying, centrifugal casting internal layer molten steel, cooling forming is promptly made bimetal composite wear resistant tube.The wear-resisting pipe that utilizes this method to produce because coating adopts the spray of water-based graphite coating, causes the carburetting of outer molten steel easily, and the increase of outer phosphorus content can reduce the toughness of product, influences product quality; Simultaneously, owing to do not adopt covering slag protection cast in the casting process, the high-melting-point slag that produces in the steelmaking process is difficult to come-up, easily produces to be mingled with and slag inclusion, can not reach complete metallurgical binding, and shear strength is lower.
Summary of the invention
The technical problem to be solved in the present invention provides a kind ofly can improve product percent of pass, can effectively prevent outer carburetting, the production method of bimetallic metallurgical composite wear-resisting tube blank safe to use.
The present invention also provides a kind of bimetal metallurgy wear-resistant composite tubes base of producing according to said method.
For solving the problems of the technologies described above, the technical scheme that the inventive method is taked is: a kind of production method of bimetallic metallurgical composite wear-resisting tube blank, its key are that this production method may further comprise the steps:
(1) the metal pipe die is baked to 200-300 ℃ after the spraying water base zirconium English powder class coating, coating thickness is 1.0-3.0mm;
(2) centrifugal casting outer sphere molten metal after after spraying is finished the metal pipe die being baked to 200-350 ℃, the cooling of cast back is treated that outer internal surface temperature is cooled to and is begun to pour into a mould inner layer metal liquid when being lower than the outer layer metal solidus temperature;
(3) inner layer metal liquid is fed centrifugal casting in the metal pipe die, pour the back cooling, treat to stop cooling after skin and internal layer all solidify, this moment, internal layer and skin reached complete metallurgical melting;
Wherein, described skin is straight carbon steel or Hi-Stren steel material, and internal layer is the high-chromium white cast iron material.
Preferably, the Hi-Stren steel material is 14MnV, 16MnV, and straight carbon steel is 20#, Q235,25#, and the high-chromium white cast iron material is Cr26, Cr15.
As the further preferred version of the present invention; add the low melting point covering slag to outer sphere molten metal before in above-mentioned steps (2); add the low melting point covering slag to the internal layer molten metal before in step (3); the fusing point of low melting point covering slag is lower than 150-300 ℃ of institute's pour steel fusing point, and addition is the 0.5%-1.5% of molten metal weight.
Further the present invention also provides the bimetallic metallurgical composite wear-resisting tube blank that is made by aforementioned production method.
Adopt the beneficial effect that technique scheme produced to be: when outer internal surface temperature is lower than outer layer metal solidus temperature certain limit, to pour into a mould inner layer metal liquid in this production method, can make internal layer and outer metallurgical melting fully like this, the thickness of the metallurgical melting layer that ectonexine forms is greatly about 0.5-2mm, the water base zirconium English powder class coating of spraying is compared the carbon content that can effectively control outer molten steel than water-based graphite coating on the pipe die wall, improves the quality of products; Further improve and add the low melting point covering slag can effectively reduce and be mingled with and slag inclusion in outer and inner layer metal liquid, make ectonexine better finish metallurgical melting, the strand qualification rate improves; The pipe of producing by this production method uses in as cast condition or after conventional heat treatment, the internal layer of its high-wearing feature, fragility links together by metallurgical melting and outer high strength, high-ductility steel, ectonexine is difficult for layering, outer layer metal provides supporting role to inner layer metal, improve the security of using than the wear-resisting pipe of monometallic rich chromium cast iron, prolonged its service life.
Description of drawings
Fig. 1 is a schematic diagram of the present invention;
Wherein, 1, metal pipe die; 2, coating; 3, skin; 4, internal layer;
The specific embodiment
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
The internal layer of bimetal clad pipe blank adopts the trade mark of stipulating among the GB8263-87 among the present invention, such as KmTBCr20Mo2Cu1, KmTBCr26 etc., difference according to instructions for use can be done suitable adjustment to its composition, skin is straight carbon steel or Hi-Stren steel material, common carbon steel material such as 20#, Q235,25#, Hi-Stren steel material such as 14MnV, 16MnV.
In the casting process, need to metal pipe die real-time cooling but, cooling device can adopt the cool water shower device that is positioned at metal pipe die top or the device of other cooling pipe dies.What adopt because of this production method is the thermodyn process centrifugal casting, needs the control centrifugal speed in the casting process, and it determines that according to the pipe die internal diameter common metal pipe die rotating speed is 60-120G.When pouring into a mould skin, inner layer metal liquid in the present invention, control metal pipe die rotating speed is about 80G.The molten metal weight that is added during cast adopts electronic scale to come weighing or adopts quantitatively tapping.
The fusing point of following embodiment 1,2,3 ectomesoderm molten metals is about 1510-1520 ℃; the fusing point of internal layer high-chromium white cast iron material metal liquid is about 1250-1290 ℃; the fusing point of the composition of low melting point covering slag and institute's casting metal is complementary; it should satisfy relation: Tm-300 ℃≤Ts≤Tm-150 ℃; Tm, Ts be respectively institute's casting metal and add the slag fusing point, unit is ℃.The composition of outer sphere molten metal and inner layer metal liquid composition are referring to table 1, and obtained pipe ectonexine composition is referring to table 2, and the relevant performance of gained pipe is referring to table 3.
Embodiment 1 (pipe specification Φ 617[external diameter] * Φ 589[in the footpath] * Φ 563[internal diameter] * 3100mm)
(1) metal pipe die 1 is baked to 270 ℃ after the spraying water base zirconium English powder class coating, coating thickness is 2.4mm; The composition of water base zirconium English powder coating should satisfy (for ratio of weight and number): (zirconium English powder: aluminium polychloride: bentonite: water: activating agent [washing powder or sodium sulfonate]=100: 5-8: 12-15: 50: 0.5-0.8)
(2) after spraying is finished the metal pipe die is baked to 280 ℃ of centrifugal casting outer sphere molten metals, poured weights is 710kg, pouring temperature is 1610 ℃, pour the back cooling, in outer sphere molten metal, add 4.5kg low melting point covering slag before the cast, the low melting point covering slag consist of (for weight percentage): CaO:34.1%; SiO
2: 29.8%; Al
2O
3: 2.51%; CaF
2: 7.94%; Na2O:14.57%; MgO:2.51%; BaO:8.57%;
(3) when being cooled to, outer internal surface temperature begins to pour into a mould inner layer metal liquid when being lower than 50-60 ℃ of outer sphere molten metal fusing point, poured weights is 530kg, pour the back cooling, treat to stop cooling after skin and internal layer all solidify, this moment, internal layer and skin reached complete metallurgical melting, cast forward direction inner layer metal liquid adds 3kg low melting point covering slag, and the low melting point covering slag consists of (for weight percentage): CaO:21%; SiO
2: 33%; Al
2O
3: 5%; CaF
2: 20%; Na
2O:12%; BaO:8%.
Embodiment 2 (pipe specification Φ 617[external diameter] * Φ 571[in the footpath] * Φ 537[internal diameter] * 3100mm)
(1) the metal pipe die is baked to 285 ℃ after the spraying water base zirconium English powder class coating, coating thickness is 2.1mm; The composition of water base zirconium English powder class coating should satisfy (for ratio of weight and number): (zirconium English powder: aluminium polychloride: bentonite: water: activating agent [washing powder or sodium sulfonate]=100: 5-8: 12-15: 50: 0.5-0.8).
(2) after spraying is finished the metal pipe die is baked to 295 ℃ of centrifugal casting outer sphere molten metals, poured weights is 1036kg, pouring temperature is 1587 ℃, pour the back cooling, add 6.5kg low melting point covering slag before the cast in outer sphere molten metal, the low melting point covering slag consists of (for weight percentage): CaO:34.1%; SiO
2: 29.8%; Al
2O3:2.51%; CaF
2: 7.94%; Na
2O:14.57%; MgO:2.51%; BaO:8.57%.
(3) when being cooled to, outer internal surface temperature begins to pour into a mould inner layer metal liquid when being lower than 110-120 ℃ of outer sphere molten metal fusing point, poured weights is 722kg, pour the back cooling, treat to stop cooling after skin and internal layer all solidify, this moment, internal layer and skin reached complete metallurgical melting, cast forward direction inner layer metal liquid adds 4kg low melting point covering slag, and the low melting point covering slag consists of (for weight percentage): CaO:21%; SiO
2: 33%; Al
2O3:5%; CaF
2: 20%; Na
2O:12%; BaO:8%.
Embodiment 3 (pipe specification Φ 222[external diameter] * Φ 193[in the footpath] * Φ 184[internal diameter] * 2100mm)
(1) the metal pipe die is baked to 280 ℃ after the spraying water base zirconium English powder class coating, coating thickness is 1.3mm; The composition of water base zirconium English powder class coating should satisfy (for ratio of weight and number): (zirconium English powder: aluminium polychloride: bentonite: water: activating agent [washing powder or sodium sulfonate]=100: 5-8: 12-15: 50: 0.5-0.8).
(2) after spraying is finished the metal pipe die is baked to 310 ℃ of centrifugal casting outer sphere molten metals, poured weights is 230kg, pouring temperature is 1644 ℃, pour the back cooling, add 1.5kg low melting point covering slag before the cast in outer sphere molten metal, the low melting point covering slag consists of (for weight percentage): CaO:34.1%; SiO
2: 29.8%; Al
2O
3: 2.51%; CaF2:7.94%; Na
2O:14.57%; MgO:2.51%; BaO:8.57%.
(3) when being cooled to, outer internal surface temperature begins to pour into a mould inner layer metal liquid when being lower than 50-60 ℃ of outer sphere molten metal fusing point, poured weights is 80kg, pour the back cooling, treat to stop cooling after skin and internal layer all solidify, this moment, internal layer and skin reached complete metallurgical melting, cast forward direction inner layer metal liquid adds 0.5kg low melting point covering slag, and the low melting point covering slag consists of (for weight percentage): CaO:31%; SiO
2: 42%; Al
2O
3: 3.4%; CaF
2: 6.5%; Na
2O:9%; MgO:4%; MnO:4.1%
Table 1 molten metal composition (percentage by weight %)
Table 2 pipe composition (percentage by weight %)
Table 3 pipe performance
Pipe its outer performance after the conventional heat treatment of normalizing+tempering that adopts the foregoing description to make can be satisfied the requirement of X52 grade of steel, and the internal layer performance satisfies high-chromium white cast iron GB GB/T8263-1999 requirement.
Protection cast by the low melting point covering slag among the present invention, T[O in the strand] content is controlled at 11 * 10
-4% (embodiment 1), 18 * 10
-4% (embodiment 2) and 33 * 10
-4The reduced levels of % (embodiment 3), the production by in batches experimental results show that by adding this low melting point covering slag, T[O] content generally can be controlled at 40 * 10
-4Below the %; And the production practices analysis by in batches draw strand qualification rate (binder course is slag inclusion not, does not superfuse) when not using this low melting point covering slag protection cast about 70%, on average risen about 25%.
By the contrast of carbon content in table 1 and the table 2 as can be seen, by spraying water base zirconium English powder class coating, can effectively prevent outer carburetting, and by burning reason, carbon content has small size decline, by 0.168% to 0.145% (embodiment 1), 0.142% to 0.135% (embodiment 2), 0.157% to 0.155% (embodiment 3), this can improve the quality of products, thereby the raising product percent of pass facts have proved by spraying this water base zirconium English powder class coating to improving product percent of pass effect is preferably arranged by batch process.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be conspicuous concerning those skilled in the art, and defined herein General Principle can realize under the situation that does not break away from the spirit or scope of the present invention in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet and principle disclosed herein and features of novelty the wideest corresponding to scope.
Claims (3)
1. the production method of a bimetallic metallurgical composite wear-resisting tube blank, it is characterized in that: this production method may further comprise the steps:
(1) the metal pipe die is baked to 200-300 ℃ after the spraying water base zirconium English powder class coating, the ratio of weight and number of described water base zirconium English powder class coating each component is: zirconium English powder: aluminium polychloride: bentonite: water: activating agent=100: 5-8: 12-15: 50: 0.5-0.8, coating thickness are 1.0-3.0mm;
(2) centrifugal casting outer sphere molten metal after after spraying is finished the metal pipe die being baked to 200-350 ℃, the cooling of cast back is treated that outer internal surface temperature is cooled to and is begun to pour into a mould inner layer metal liquid when being lower than 50～60 ℃ of outer layer metal solidus temperatures;
(3) inner layer metal liquid is fed centrifugal casting in the metal pipe die, pour the back cooling, treat to stop cooling after skin and internal layer all solidify, this moment, internal layer and skin reached complete metallurgical melting;
Add the low melting point covering slag to outer sphere molten metal before in step (2), the weight percentage of the low melting point covering slag each component of Jia Ruing is herein: CaO:34.1%; SiO
2: 29.8%; Al
2O
3: 2.51%; CaF
2: 7.94%; Na
2O:14.57%; MgO:2.51%; BaO:8.57%;
Add the low melting point covering slag to the internal layer molten metal before in step (3), the fusing point of described low melting point covering slag is lower than 150-300 ℃ of institute's pour steel fusing point, and addition is the 0.5%-1.5% of molten metal weight;
Wherein, described skin is straight carbon steel or Hi-Stren steel material, and internal layer is the high-chromium white cast iron material.
2. the production method of bimetallic metallurgical composite wear-resisting tube blank according to claim 1, it is characterized in that: described Hi-Stren steel material is 14MnV, 16MnV, and straight carbon steel is 20#, Q235,25#, and the high-chromium white cast iron material is Cr26, Cr15.
3. a bimetallic metallurgical composite wear-resisting tube blank is characterized in that: adopt claim 1 or 2 described production method processing and manufacturings.
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| CN101774010A CN101774010A (en) | 2010-07-14 |
| CN101774010B true CN101774010B (en) | 2011-08-31 |
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| CN108927502A (en) * | 2018-06-28 | 2018-12-04 | 卓然(靖江)设备制造有限公司 | A kind of centrifugal casting low melting point covering slag |
| CN108580829B (en) * | 2018-06-28 | 2019-09-17 | 江苏卓然智能重工有限公司 | A kind of bimetallic pipe billet centrifugation production method |
| CN108889918B (en) * | 2018-06-28 | 2020-09-04 | 卓然(靖江)设备制造有限公司 | Centrifugal production method of thin-wall bimetallic tube |
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