CN101927326A - Centrifugal casting process for minor-caliber ultra-thin-wall microalloy furnace tube - Google Patents
Centrifugal casting process for minor-caliber ultra-thin-wall microalloy furnace tube Download PDFInfo
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- CN101927326A CN101927326A CN 201010178069 CN201010178069A CN101927326A CN 101927326 A CN101927326 A CN 101927326A CN 201010178069 CN201010178069 CN 201010178069 CN 201010178069 A CN201010178069 A CN 201010178069A CN 101927326 A CN101927326 A CN 101927326A
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Abstract
The invention discloses a centrifugal casting process for a minor-caliber ultra-thin-wall microalloy furnace tube. The tapping temperature and the casting temperature of the casting molten steel, the temperature of a mould cylinder and the like are strictly controlled, so that the cast minor-caliber ultra-thin-wall microalloy furnace tube meets the design requirements and increases the yield thereof greatly. The centrifugal casting process can further reduce the wall thickness and the tube diameter of the furnace tube and reduce the manufacturing cost of the furnace tube, wherein the minimum wall thickness is 5 mm and the minimum tube diameter is 50 mm. The outer surface of the mould cylinder is divided into three segments for carrying out temperature control, so that on one hand, the drying speed of the coating is increased, the exhaust amount of the coating is reduced and the exhaust speed of the coating in the mould cylinder can be increased, and on the other hand, the temperature difference between the cast segment and the tail segment of the mould cylinder is reduced, thus the stress and deformation of the furnace tube during the casting cooling are reduced.
Description
Technical field
The present invention relates to a kind of centrifugal casting technique of alloy furnace tubes by adopting, relate in particular to the centrifugal casting technique of the minor-caliber ultra-thin-wall microalloy furnace tube that uses on a kind of petrochemical industry hydrogen manufacturing conversion furnace and the ethane cracking furnace.
Background technology
Along with the development of World Economics, temperature of the earth warms and is unusual, and countries in the world are attached great importance to environmental protection, and energy-saving and emission-reduction are directions of world's future economy development.China also proposes STRATEGIES OF SUSTAINABLE DEVELOPMENT thought, and protection environment, energy-saving and emission-reduction and development low-carbon economy are the only ways of China's sustainable development economy.
The China's oil chemical industry is for protecting the people's livelihood, be products such as the required synthetic ammonia of developing agricultural, urea, chemical fertilizer, be products such as the required melamine of developing industry, methyl alcohol, acetic acid, be products such as the required hydrogen of quality that improves gasoline equal energy source product, methyl alcohol, be the required ethylene product of development plastics industry, these products all need hydrogen manufacturing conversion furnace and ethane cracking furnace to transform with cracking under up to 800-1200 ℃ to obtain, consume a large amount of oil and natural gas equal energy source products.The caliber size of the thousands of ton high-temperature resisting alloy furnace tubes by adopting that above-mentioned two kinds of stoves use and the thickness of tube wall directly influence the energy use efficiency of stove, and make used precious metal nickel of this high-temperature alloy furnace tube and chromium consumption.How to improve the high-temperature behavior of high-temperature alloy furnace tube, make it the caliber miniaturization and the tube wall slimming is achieved, the scientific worker has carried out unremitting effort for this reason.Minimum 80 millimeter of its caliber before 20 years, minimum 15 millimeter of wall thickness.Minimum 60 millimeter of its caliber before 10 years, minimum 8 millimeter of wall thickness.In order to adapt to the requirement of above-mentioned economic development, nearly 10 years minimum 55 millimeter of its caliber, minimum 5.5 millimeter of wall thickness.From following table as can be seen, over more than 60 year the caliber of the used alloy material of alloy furnace tubes by adopting, alloy furnace tubes by adopting and wall thickness with and the evolution process of high-temperature behavior.
Adopt now the I of minor-caliber ultra-thin-wall microalloy furnace tube caliber of ZG45Ni35Cr25NbTiZr material centrifugal casting to reach 50 millimeters, the I of wall thickness reaches 5 millimeters, has further reduced caliber and wall thickness.But minor-caliber ultra-thin-wall centrifugal casting boiler tube has following difficult point:
1) because the smelting molten steel amount of minor-caliber ultra-thin-wall centrifugal casting boiler tube is few, only about 50kg, its thermal capacity is little, be not easy coating gas drying in the type tube is drained, so its tail end is easy to occur pore.
2) because the smelting molten steel amount of minor-caliber ultra-thin-wall centrifugal casting boiler tube is few, only about 50kg, cooling velocity is too fast after the spun casting, so the stress that its cooling causes is very big, is easy to generate crackle and fracture.
3) because the smelting molten steel amount of minor-caliber ultra-thin-wall centrifugal casting boiler tube is few, only about 50kg, liquid steel temperature height when therefore requiring cast.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of novel centrifugal casting process for minor-caliber ultra-thin-wall microalloy furnace tube is provided, the temperature etc. of tapping temperature, cast temperature and the type tube of casting molten steel is carried out strictness to be controlled, the minor-caliber ultra-thin-wall microalloy furnace tube of casting is not only met design requirement, and increase substantially its yield rate.
At above-mentioned minor-caliber ultra-thin-wall centrifugal casting boiler tube difficult point, the present invention adopts following technological measure:
A. at above-mentioned 1) difficult point, this patent adopts the high zircon flour coating of refractoriness.Because its refractoriness height can suitably reduce paint thickness in the type tube like this on technological measure, to reduce the capacity of coating.Suitable simultaneously integral body improves the temperature of type tube, accelerates the rate of drying of coating, reduces the capacity of coating again.And can improve coating exhaust velocity in the type tube.
B. at above-mentioned 2) difficult point, suitably reduce the granularity of coating, this patent can may improve the fineness of coating in the type tube on technological measure, the frictional force when shrinking to reduce boiler tube spun casting cooling.Improve the temperature of type tube simultaneously and reduce the casting section of type tube and the temperature difference of rear, stress and deformation when cooling off to reduce the boiler tube cast.
C. at above-mentioned 3) difficult point, this patent technological measure improves the molten steel tapping temperature, reduces time and the slag hitting time of molten steel in ladle, to keep the steel tapping temperature as far as possible.The height of design casting ladle is greater than the diameter of casting ladle, to increase the pressure head of pouring molten steel, only makes that the molten steel import of the 50kg left and right sides pours into type tube, to reduce the molten steel thermal loss as far as possible.
Technical scheme of the present invention is achieved in that
A kind of centrifugal casting process for minor-caliber ultra-thin-wall microalloy furnace tube is characterized in that, comprises the steps:
1. the startup casting system is controlled at 2500-3000 rev/min with the type tube rotary speed of casting, and adopts zircon flour coating that described type tube inwall is sprayed, and the outer surface to type tube heats simultaneously, and temperature is controlled at 340-400 ℃;
2. cast then, guarantee tapping temperature 1650-1700 ℃ of molten steel, cast temperature is 1600-1650 ℃, and the casting back slag hitting time is 8-12S.
The granularity of described zircon flour coating is the 300-350 order, and its viscosity is for using No. 3 flow cups, and brimmer 10-13 second flow is intact.
Outer surface to described type tube divides three sections to carry out temperature control, and the casting section is controlled at 340-360 ℃, and the stage casing is controlled at 360-380 ℃, and rear is controlled at 380-400 ℃.
The height of casting ladle is greater than the diameter of casting ladle.
The present invention compared with prior art has following advantage:
1. adopt the high zircon flour coating of refractoriness, reduce paint thickness in the type tube, reduced the capacity of coating simultaneously.
2. the granularity of coating is the 300-500 order, and its viscosity is for using No. 3 flow cups, and brimmer 10-13 second flow is intact, improves the fineness of coating in the type tube, the frictional force when shrinking to reduce boiler tube spun casting cooling.
3. the outer surface of type tube divides three sections to carry out temperature control, accelerates the rate of drying of coating on the one hand, reduces the capacity of coating, also can improve coating exhaust velocity in the type tube; Reduce the casting section of type tube and the temperature difference of rear on the other hand, stress and deformation when cooling off to reduce the boiler tube cast.
4. the height of casting ladle to increase the pressure head of pouring molten steel, reduces the molten steel thermal loss greater than the diameter of casting ladle as far as possible.
The specific embodiment
Following examples are used to illustrate the present invention, but are not used for limiting the scope of the invention, and all technical schemes that are equal to also belong to category of the present invention, and scope of patent protection of the present invention should be limited by every claim.
Example one: boiler tube specification: φ 55 * 5 * 3200mm, material: ZG45Ni35Cr25NbTiZr, quantity: 500.Adopting process such as following table:
Boiler tube outward appearance and dimension control: boiler tube surface pore-free, slag inclusion, crack defect, size is qualified.
Boiler tube normal temperature mechanical performance test:
The check of boiler tube high temperature endurance performance:
Example two: boiler tube specification: φ 50 * 5 * 3100mm, material: ZG45Cr28Ni48W5, quantity: 610.Adopting process such as following table:
Boiler tube outward appearance and dimension control: boiler tube surface pore-free, slag inclusion, crack defect, size is qualified.
Boiler tube normal temperature mechanical performance test:
The check of boiler tube high temperature endurance performance:
Claims (4)
1. a centrifugal casting process for minor-caliber ultra-thin-wall microalloy furnace tube is characterized in that, comprises the steps:
A. start casting system, the type tube rotary speed of casting is controlled at 2500-3000 rev/min, adopt zircon flour coating that described type tube inwall is sprayed, the outer surface to type tube heats simultaneously, and temperature is controlled at 340-400 ℃;
B. cast then, the tapping temperature that guarantees molten steel is at 1650-1700 ℃, and cast temperature is 1600-1650 ℃, and the casting back slag hitting time is 8-12S.
2. a kind of centrifugal casting process for minor-caliber ultra-thin-wall microalloy furnace tube according to claim 1 is characterized in that: the granularity of described zircon flour coating is the 300-350 order, and its viscosity is for using No. 3 flow cups, and brimmer 10-13 second flow is intact.
3. a kind of centrifugal casting process for minor-caliber ultra-thin-wall microalloy furnace tube according to claim 1, it is characterized in that: the outer surface to described type tube divides three sections to carry out temperature control, the casting section is controlled at 340-360 ℃, and the stage casing is controlled at 360-380 ℃, and rear is controlled at 380-400 ℃.
4. a kind of centrifugal casting process for minor-caliber ultra-thin-wall microalloy furnace tube according to claim 1 is characterized in that: the height of casting ladle is greater than the diameter of casting ladle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 201010178069 CN101927326A (en) | 2010-05-20 | 2010-05-20 | Centrifugal casting process for minor-caliber ultra-thin-wall microalloy furnace tube |
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| CN 201010178069 CN101927326A (en) | 2010-05-20 | 2010-05-20 | Centrifugal casting process for minor-caliber ultra-thin-wall microalloy furnace tube |
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| CN 201010178069 Pending CN101927326A (en) | 2010-05-20 | 2010-05-20 | Centrifugal casting process for minor-caliber ultra-thin-wall microalloy furnace tube |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102717229A (en) * | 2011-12-26 | 2012-10-10 | 青岛正大铸造有限公司 | Production process for cylinder and doffer of centrifugal casting cotton combing machine |
| CN103611909A (en) * | 2013-11-26 | 2014-03-05 | 武昌船舶重工有限责任公司 | Method for preventing cold shuts and interlayer defects in small-caliber cast steel suite casting process |
| CN110421133A (en) * | 2019-07-25 | 2019-11-08 | 北京工业大学 | A kind of preparation method of centrifugal casting Ethylene Cracking Furnace Tubes |
Citations (5)
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| CN1069074A (en) * | 1992-07-30 | 1993-02-17 | 冶金工业部钢铁研究总院 | Spheroidizing method for centrifugal casting compounded roller |
| CN1086470A (en) * | 1992-11-03 | 1994-05-11 | 张玉华 | The centre spinning method of a kind of special steel, high-temperature alloy steel seamless pipe |
| CN1320499A (en) * | 2001-02-21 | 2001-11-07 | 四川恒宏科技钢管有限公司 | Dual-coating cylindrical mould |
| CN101530897A (en) * | 2008-07-24 | 2009-09-16 | 新兴铸管股份有限公司 | Bimetal clad pipe blank with transition layer and production method and production device thereof |
| CN101648802A (en) * | 2009-09-14 | 2010-02-17 | 浦杰 | Composite coating for heat-resisting alloy centrifugal casting tube |
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2010
- 2010-05-20 CN CN 201010178069 patent/CN101927326A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1069074A (en) * | 1992-07-30 | 1993-02-17 | 冶金工业部钢铁研究总院 | Spheroidizing method for centrifugal casting compounded roller |
| CN1086470A (en) * | 1992-11-03 | 1994-05-11 | 张玉华 | The centre spinning method of a kind of special steel, high-temperature alloy steel seamless pipe |
| CN1320499A (en) * | 2001-02-21 | 2001-11-07 | 四川恒宏科技钢管有限公司 | Dual-coating cylindrical mould |
| CN101530897A (en) * | 2008-07-24 | 2009-09-16 | 新兴铸管股份有限公司 | Bimetal clad pipe blank with transition layer and production method and production device thereof |
| CN101648802A (en) * | 2009-09-14 | 2010-02-17 | 浦杰 | Composite coating for heat-resisting alloy centrifugal casting tube |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102717229A (en) * | 2011-12-26 | 2012-10-10 | 青岛正大铸造有限公司 | Production process for cylinder and doffer of centrifugal casting cotton combing machine |
| CN103611909A (en) * | 2013-11-26 | 2014-03-05 | 武昌船舶重工有限责任公司 | Method for preventing cold shuts and interlayer defects in small-caliber cast steel suite casting process |
| CN110421133A (en) * | 2019-07-25 | 2019-11-08 | 北京工业大学 | A kind of preparation method of centrifugal casting Ethylene Cracking Furnace Tubes |
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Open date: 20101229 |