CN1302706A - Centrifugal casting mehtod with graate speed variation for casting steel pipe - Google Patents

Centrifugal casting mehtod with graate speed variation for casting steel pipe Download PDF

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Publication number
CN1302706A
CN1302706A CN 01107069 CN01107069A CN1302706A CN 1302706 A CN1302706 A CN 1302706A CN 01107069 CN01107069 CN 01107069 CN 01107069 A CN01107069 A CN 01107069A CN 1302706 A CN1302706 A CN 1302706A
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China
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casting
steel
tube
type tube
pipe
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CN 01107069
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Chinese (zh)
Inventor
张永刚
余中友
杨华均
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四川恒宏科技钢管有限公司
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Priority to CN 01107069 priority Critical patent/CN1302706A/en
Publication of CN1302706A publication Critical patent/CN1302706A/en

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Abstract

A centrifugal method for casting steel tube by great speed variation includes such steps as spraying quartz or zircon paint on the inner surface of hot cylindrical mould, and baking the coating layer; pouring molten steel at initial speed of 500-700 rpm of the mould rotation and then accelerating by a rate of 170-350 rpm2 with the pouring rate of 20-150 Kg/s, and after solidifying, decelerating by a rate of 100-200 rpm2 to the low-speed; stopping machine and demoulding when temp. lowers below 920 deg.C. Its advantages is no loose layer, impurities and pinhole on inner surface of cast tube.

Description

The method of powerful speed change centrifugal casting steel tube
The present invention relates to the centrifugal casting of microscler incavation, particularly relate to a kind of method of powerful speed change centrifugal casting steel tube
Centrifugal casting is to produce one of basic skills of cast iron and cast steel pipe fitting, during the centrifugal casting pipe fitting, is the interior casting of type (mould) the tube molten steel toward the certain speed rotation, treats to drop to the uniform temperature demoulding again behind the molten steel solidification.Constant rotational speed is adopted in the centrifugal casting of this routine more, for example Chinese patent ZL92112681 " centre spinning method of a kind of special steel, high-temperature alloy steel seamless pipe " that provide or the like.Because the rotating speed of type tube is constant during centrifugal casting, thereby does not have " brute force " and can say that the cast tube spare interior wall tissue of acquisition often has one deck weaker zone, the performance of product is more undesirable.
The present invention's purpose is intended to overcome deficiency of the prior art, according to the thermodynamics and kinetics principle of molten steel solidification process, provides a kind of cast tube spare inner wall surface not have the method for the powerful speed change centrifugal casting steel tube of loose, no field trash and pore
Content of the present invention is: a kind of method of powerful speed change centrifugal casting steel tube, mainly by smelting, the spun casting and the demoulding, the water pressure test, and metal lographic examination and/or Mechanics Performance Testing step composition, it is characterized in that: the described spun casting and the demoulding comprise the following steps:
A. the pattern of fever tube inner surface is sprayed quartzy coating or zirconium English coating, after the spraying, again coating is carried out flood and bake;
B. casting: during casting, the initial rotating speed of type tube is 500-700r/min, and along with molten steel is cast in the type tube, type tube is with 170-350r/min 2Acceleration promote rotating speed, molten steel casting speed is 20-150kg/s, when molten steel casting finished, rotating speed reached 2000-4000r/min, after solidifying, type tube is with-100-200r/min 2Acceleration reduce rotating speed to 100-200r/min;
Stop when c. the type tube internal surface temperature drops to below 920 ℃, with taking off the pipe machine the foundry goods demoulding.
In the content of the present invention: described baking is carried out for sending in the electric furnace, and baking temperature is that 200 ℃-300 ℃, time are 20-60min.
In the content of the present invention: described baking is also crossed can be for adopting the spray gun baking, and promptly spray gun toasts 4-6 time back and forth, and flame temperature is 1800 ℃-2500 ℃.
In the content of the present invention: described spun casting is applicable to the steel pipe of various wall thickness.
In the described smelting step of content of the present invention: smelting equipment adopts electric arc furnaces, also can adopt intermediate frequency furnace; Raw material according to the purposes of pipe, is equipped with suitable alloying element based on steel scrap; When molten steel is come out of the stove, the molten steel cleaning, temperature (is decided on specific requirement) between 1550~1750 ℃; Before coming out of the stove, the analysis of chemical element can adopt chemical method or direct-reading spectrometer to carry out.
In the content of the present invention: after the described smelting step, before centrifugal casting and the demoulding step, the external refining step can also be arranged, be after molten steel is poured ladle into, in order to improve metallurgical quality, carry out line feeding and handle in ladle, the line feeding classification has: Si-Ca line, Si-Al-Ba line etc., wire-feeding velocity is 0.5~2m/s, and feed quantity is 0.2~0.5%.
In the content of the present invention: after described spun casting and the demoulding step, before the hydrostatic test step, the Shot Blasting step can also be arranged, this operation is decided on the product situation, through Shot Blasting, can change the surfaces externally and internally state of steel pipe, and thoroughly remove the appended coating of outer surface, improve the quality of surfaces externally and internally.
In the content of the present invention, described pressure test procedure is carried out on testing stand, withstands the pipe two ends with end socket, in pipe, inject water by pump, make it reach certain pressure, general 2~35MPa (determining pressure) according to customer requirements, whether pressurize 10~40min is fine and close to determine pipe.
In described metal lographic examination of content of the present invention and/or the Mechanics Performance Testing step: according to different materials and different service conditions, the metallographic structure of pipeline section can be austenite, ferrite+pearlite, austenite+ferrite, martensite, bainite or martensite+bainite etc.; Identify the rank of field trash simultaneously; The detection of mechanical property is decided according to user's requirement.
The present invention has following characteristics
(1) adopt the powerful speed change centrifugal casting of the present invention, can make the spun cast pipe dense structure of production, inwall does not have weaker zone, pore-free, and the field trash in pipe cross section is less than 0.5 grade;
(2) the high temperature alloy cast tubes such as ZGNi35Cr25WNb that adopt the present invention to produce, the enduring quality that its high temperature is 1050 ℃ can improve 10 times;
(3) the wear-resistant pipe that adopts the present invention to produce, its life-span improves more than 3~5 times than 16Mn steel pipe;
(4) adopt the present invention, can produce diameter is that φ 22mm~2000mm, thickness are that 3mm~70mm, length are the various cast tube products of 1000mm~8000mm;
(5) method is simple, and cost is low, and is practical, and properties of product significantly improve.
The invention will be further described below by embodiment.
Embodiment 1:
Chemical composition is: C 0.41%, and Mn 0.35%, and Cr 1.54%, and Mo 0.20%, and Al 0.83%, and surplus is Fe.In the type tube of φ 110 * 5000, spray quartzy coating, toast back and forth 6 times with the internal coating of spray gun then.With the A3 steel is primary raw material, smelt with the 500Kg intermediate frequency furnace, requirement according to material prescription, add alloying element, adopt direct-reading spectrometer to carry out on-the-spot sample analysis, after composition is qualified, 1580 ℃ molten steel is poured in the ladle, the speed with 1m/s in ladle is fed Si-Al-Ba line (addition 0.4%).Teeming speed with 130Kg/s pours in the type tube then, and the initial velocity of type tube is 500r/min, and along with the carrying out of casting, rotating speed promotes rapidly, and acceleration is 270r/min 2, casting reaches 3100r/min when finishing.After solidifying end, with-165r/min 2Acceleration slow down.When treating that the type tube temperature reaches 920 ℃, with taking off the demoulding of pipe machine.When pipe drops to room temperature fully, carry out the sample preparation and the detection of the water pressure test and metallographic and mechanical property.
This pipe has been eliminated the segregation of aluminium fully, makes on the cross section of pipe even tissue.
Embodiment 2:
Chemical composition is: C 0.43%, and Si 1.32%, and Mn 0.53%, and S 0.020%, P0.028% Cr 23.70%, and Ni 36.50%, and Mo 0.32%, and W 1.60%, Nb1.63%, surplus is Fe.In the type tube of φ 130 * 5000, spraying zirconium English coating toasts 50min to type tube then under 300 ℃.With the A3 steel is primary raw material, according to the requirement of material prescription, adds alloying element, smelt with the 500Kg intermediate frequency furnace, adopt chemical method to carry out on-the-spot sample analysis, after composition is qualified, 1680 ℃ molten steel is poured in the ladle, and the speed with 1.8m/s in ladle is fed Si-Ba line (addition 0.2%).Teeming speed with 65Kg/s pours in the type tube then, and the initial velocity of type tube is 500r/min, and along with the carrying out of casting, rotating speed promotes rapidly, and acceleration is 320r/min 2, casting reaches 3950r/min when finishing.After solidifying end, with-185r/min 2Acceleration slow down.When treating that the type tube temperature reaches 725 ℃, with taking off the demoulding of pipe machine.When pipe dropped to room temperature fully, outer surface carried out Shot Blasting, carried out the sample preparation and the detection of the water pressure test and metallographic and mechanical property at last.
This pipe is used for cracking furnace pipe, and in the time of 1050 ℃, percentage elongation improves 78% than mark.
Embodiment 3:
Chemical composition is: C 0.40%, and Si 1.82%, and Mn 1.20%, and S 0.031%, P0.028%, and Cr 24.50%, and Ni 21.30%, and Mo 0.20%, and surplus is Fe.In the type tube of φ 130 * 5000, spraying zirconium English coating toasts 40min to type tube then under 300 ℃.Smelting with the 500Kg intermediate frequency furnace, is primary raw material with the A3 steel, according to the requirement of material prescription, add alloying element, adopt chemical method to carry out on-the-spot sample analysis, after composition is qualified, 1700 ℃ molten steel is poured in the ladle, and the speed with 0.5m/s in ladle is fed Si-Ca line (addition 0.3%).Teeming speed with 30Kg/s pours in the type tube then, and the initial velocity of type tube is 500r/min, and along with the carrying out of casting, rotating speed promotes rapidly, acceleration 230r/min 2, casting reaches 2500r/min when finishing.After solidifying end, with-130r/min 2Acceleration slow down.When treating that the type tube temperature reaches 480 ℃, with taking off the demoulding of pipe machine.When dropping to room temperature fully, outer surface carries out Shot Blasting, carries out the sample preparation and the detection of the water pressure test and metallographic and mechanical property at last.
This pipe is used for conversion of ethylene stove boiler tube, and at 871 ℃, during 69MPa, disrumpent feelings time ratio standard improved 20 hours.
Embodiment 4:
Chemical composition is: C 0.38%, and Mn 0.53%, and Cr 1.35%, and Mo 0.16%, and Al 1.03%, and surplus is Fe.In the type tube of φ 110 * 5000, spray quartzy coating, toast back and forth 6 times with the internal coating of spray gun then.With the A3 steel is primary raw material, smelts with the 500Kg intermediate frequency furnace, according to the requirement of material prescription, add alloying element, adopt chemical method to carry out on-the-spot sample analysis, after composition is qualified, 1610 ℃ molten steel is poured in the ladle, and the speed with 0.7m/s in ladle is fed Si-Ca line (addition 0.2%).Teeming speed with 20Kg/s pours in the type tube then, and the initial velocity of type tube is 500r/min, and along with the carrying out of casting, rotating speed promotes rapidly, acceleration 170r/min 2, casting reaches 2100r/min when finishing.After solidifying end, with-200r/min 2Acceleration slow down.When treating that the type tube temperature reaches 500 ℃, with taking off the demoulding of pipe machine.When dropping to room temperature fully, carry out the sample preparation and the detection of the water pressure test and metallographic and mechanical property.
This pipe has been eliminated the segregation of aluminium fully, makes on the cross section of pipe even tissue.
Embodiment 5:
Chemical composition is: C 0.45%, and Si 1.48%, and Mn 1.48%, and S 0.013%, P0.027% Cr 24.39%, and Ni 34.90%, and Mo 0.33%, and W 1.53%, Nb1.60%, surplus is Fe.In the type tube of φ 130 * 5000, spraying zirconium English coating toasts 35min to type tube then under 300 ℃.With the A3 steel is primary raw material, smelts with the 500Kg intermediate frequency furnace, according to the requirement of material prescription, add alloying element, adopt chemical method to carry out on-the-spot sample analysis, after composition is qualified, 1650 ℃ molten steel is poured in the ladle, and the speed with 0.5m/s in ladle is fed Si-Ba line (addition 0.5%).Teeming speed with 150Kg/s pours in the type tube then, and the initial velocity of type tube is 500r/min, and along with the carrying out of casting, rotating speed promotes rapidly, acceleration 200r/min 2, casting reaches 2900r/min when finishing.After solidifying end, with-180r/min 2Acceleration slow down.When treating that the type tube temperature reaches 380 ℃, with taking off the demoulding of pipe machine.When dropping to room temperature fully, carry out the sample preparation and the detection of the water pressure test and metallographic and mechanical property.
This pipe is used for cracking furnace pipe, and at 1050 ℃, under the 17.02Mpa, the disrumpent feelings time reaches 303 hours, improves 3 times than standard.
Embodiment 6:
Chemical composition is: C 0.36%, and Mn 0.50%, and Cr 1.55%, and Mo 0.23%, and Al 0.95%, and surplus is Fe.In the type tube of φ 110 * 5000, spraying zirconium English coating toasts 60min to type tube then under 300 ℃.With the A3 steel is primary raw material, smelt with the 500Kg intermediate frequency furnace, requirement according to material prescription, add alloying element, adopt chemical method to carry out on-the-spot sample analysis, after composition is qualified, 1550 ℃ molten steel is poured in the ladle, the speed with 0.9m/s in ladle is fed Si-Al-Ba line (addition 0.3%).Teeming speed with 50Kg/s pours in the type tube then, and the initial velocity of type tube is 500r/min, and along with the carrying out of casting, rotating speed promotes rapidly, acceleration 300r/min 2, casting reaches 4000r/min when finishing.After solidifying end, with-105r/min 2Acceleration slow down.When treating that the type tube temperature reaches 800 ℃, with taking off the demoulding of pipe machine.When dropping to room temperature fully, carry out the sample preparation and the detection of the water pressure test and metallographic and mechanical property.
This pipe has been eliminated the segregation of aluminium fully, makes on the cross section of pipe even tissue.
Embodiment 7:
Adopt the 1.5t electric arc furnace smelting, raw material is based on steel scrap, and chemical formulation is: C 0.45.%, and Mn1.0%, Si 0.7%, and S 0.025%, and P 0.030%, and Cr 0.85%, and Mo 0.32%, and surplus is Fe.Inner-wall spraying zirconium English coating at φ 406 * 8000 pattern of fever tubes after toasting 4 times back and forth with spray gun, places on the centrifuge, and the molten steel tapping temperature is 1610 ℃, and centrifugal casting technology is rotating speed 500~2000r/min, acceleration 350r/min 2, teeming speed 46Kg/s solidifies the back with-190r/min 2Acceleration slows down.The demoulding when the type tube internal surface temperature drops to 450 ℃ during the air cooling room temperature, is carried out the water pressure test after the demoulding.Through Metallographic Analysis, the cross section of pipe is martensite+bainite structure, and hardness is HRC35.
This pipe is used to carry the breeze of thermal power plant, and the life-span is improved 4 times than 16Mn steel steel pipe.
Embodiment 8:
Material prescription is: C 0.50.%, and Mn 1.6%, and Si 1.2%, and S 0.030%, and P 0.030%, and Cr 1.62%, and Mo 0.17%, and surplus is Fe.Raw material is based on steel scrap, adopt the 1.5t electric arc furnace smelting, after the inwall of φ 406 * 4000 cold mould tubes toasts 4 times back and forth with spray gun, spray quartzy coating again, toast 4 times back and forth with spray gun again after, place on the centrifuge, the molten steel tapping temperature is 1550 ℃, after molten steel composition is qualified, pours in the ladle, teeming speed with 75Kg/s pours in the type tube that rotating speed is 500r/min acceleration 250r/min again 2, casting reaches 3500r/min when finishing.After solidifying end, with-150r/min 2Acceleration slows down.When the type tube internal surface temperature drops to 430 ℃, use the drawbench demoulding, use the compressed air spraying inwall after the demoulding, up to room temperature.Through Metallographic Analysis, the cross section of pipe is martensite+bainite structure, and hardness is HRC32.
This pipe is used to carry the breeze of thermal power plant, and the life-span is improved 3~4 times than A3 steel steel pipe.
Embodiment 9:
Adopt the 500Kg intermediate frequency furnace to smelt, raw material is based on the A3 steel, and material prescription is: C 0.27.%, and Mn 1.30%, and Si 1.1%, and S 0.031%, and P 0.030%, and Ni 0.40%, and V 0.06%, and surplus is Fe.Inner-wall spraying zirconium English coating at φ 327 * 5000 pattern of fever tubes after toasting 6 times back and forth with spray gun, places on the centrifuge, and the molten steel tapping temperature is 1580 ℃, and centrifugal casting technology is rotating speed 500~2500r/mi, acceleration 310r/min 2(reaching 2500r/min when casting finishes), teeming speed 40Kg/s solidifies and finishes the back with-100r/min 2Acceleration slows down.The demoulding when the type tube internal surface temperature drops to 320 ℃, air cooling is to room temperature then.Through Metallographic Analysis, the cross section of pipe is martensite+bainite structure, and hardness is HRC30.
This pipe is used to carry the cement in cement plant, and the life-span is improved 3 times than 16Mn steel steel pipe.
Embodiment 10:
Material prescription is: C 0.43.%, and Mn 1.26%, and Si 0.87%, and S 0.030%, P0.030%, Cr 2.62%, and Mo 0.37%, and surplus is Fe.Raw material adopts the 1.5t electric arc furnace smelting, after the inwall of φ 406 * 4000 cold mould tubes toasts 5 times back and forth with spray gun based on steel scrap, spray zirconium English coating again, after toasting 5 times back and forth with spray gun again, place on the centrifuge, the molten steel tapping temperature is 1650 ℃, after molten steel composition is qualified, pour in the ladle, the teeming speed with 75Kg/s pours in the type tube that rotating speed is 500r/min, during cast again, improve rotating speed gradually, acceleration 310r/min 2, cast reaches 3800r/min when finishing, solidify end after, again with-150r/min 2Acceleration slows down.When the type tube internal surface temperature drops to 400 ℃, use the drawbench demoulding, air cooling is to room temperature after the demoulding.Through Metallographic Analysis, the cross section of pipe is martensite+bainite structure, and hardness is HRC31.
This pipe is used to carry the breeze of thermal power plant, and the life-span is improved 3 times than A3 steel steel pipe.
The invention is not restricted to the foregoing description, content of the present invention is described all can implement and have good result, slightly.

Claims (4)

1. the method for a powerful speed change centrifugal casting steel tube, mainly by smelting, the spun casting and the demoulding, the water pressure test, and metal lographic examination and/or Mechanics Performance Testing step form, it is characterized in that: the described spun casting and the demoulding comprise the following steps:
A. the pattern of fever tube inner surface is sprayed quartzy coating or zirconium English coating, after the spraying, again coating is toasted;
B. casting: during casting, the initial rotating speed of type tube is 500-700r/min, and along with molten steel is cast in the type tube, type tube is with 170-350r/min 2Acceleration promote rotating speed, molten steel casting speed is 20-150kg/s, when molten steel casting finished, rotating speed reached 2000-4000r/min, after solidifying, type tube is with-100-200r/min 2Acceleration reduce rotating speed to 100-200r/min;
Stop when c. the type tube internal surface temperature drops to below 920 ℃, with taking off the pipe machine the foundry goods demoulding.
2. by the method for the described powerful speed change centrifugal casting steel tube of claim 1, it is characterized in that: described baking is carried out for sending in the electric furnace, and baking temperature is that 200 ℃-300 ℃, time are 20-60min.
3. by the method for the described powerful speed change centrifugal casting steel tube of claim 1, it is characterized in that: described baking is for adopting the spray gun baking, and promptly spray gun toasts 4-6 time back and forth, and flame temperature is 1800 ℃-2500 ℃.
4. by the method for claim 1,2 or 3 described powerful speed change centrifugal casting steel tubes, it is characterized in that: described spun casting is applicable to the steel pipe of various wall thickness.
CN 01107069 2001-01-21 2001-01-21 Centrifugal casting mehtod with graate speed variation for casting steel pipe CN1302706A (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101817067A (en) * 2010-05-06 2010-09-01 四川三洲川化机核能设备制造有限公司 Method for producing seamless stainless steel tube by centrifugally pouring hollow billet
CN102416557A (en) * 2011-10-25 2012-04-18 马鞍山市威龙科工贸有限公司 Integrated production technology for ring cast forging
CN102847906A (en) * 2012-09-29 2013-01-02 芜湖新兴铸管有限责任公司 High-quality centrifugal casting method for steel pipe blank
CN103611910A (en) * 2013-11-26 2014-03-05 武昌船舶重工有限责任公司 Method for preventing crack defects in centrifugal casting of small-caliber duplex stainless steel shaft sleeve
CN107435125A (en) * 2017-07-25 2017-12-05 烟台市中拓合金钢有限责任公司 A kind of powder metallurgy immersion coating stove boiler tube
CN107824757A (en) * 2017-11-28 2018-03-23 宁波江北珂达汽车技术有限公司 Casting device for cylinder sleeve shaping
CN107855485A (en) * 2017-11-28 2018-03-30 宁波江北珂达汽车技术有限公司 The casting method of cylinder sleeve
CN108098265A (en) * 2017-12-13 2018-06-01 太原科技大学 A kind of non-ferrous metal seamless shell production technology
CN109047700A (en) * 2018-07-19 2018-12-21 柳州市创科复合金属陶瓷制品有限公司 A kind of compound body of roll production method of bimetallic

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101817067A (en) * 2010-05-06 2010-09-01 四川三洲川化机核能设备制造有限公司 Method for producing seamless stainless steel tube by centrifugally pouring hollow billet
CN102416557A (en) * 2011-10-25 2012-04-18 马鞍山市威龙科工贸有限公司 Integrated production technology for ring cast forging
CN102847906A (en) * 2012-09-29 2013-01-02 芜湖新兴铸管有限责任公司 High-quality centrifugal casting method for steel pipe blank
CN102847906B (en) * 2012-09-29 2014-06-11 芜湖新兴铸管有限责任公司 High-quality centrifugal casting method for steel pipe blank
CN103611910A (en) * 2013-11-26 2014-03-05 武昌船舶重工有限责任公司 Method for preventing crack defects in centrifugal casting of small-caliber duplex stainless steel shaft sleeve
CN107435125A (en) * 2017-07-25 2017-12-05 烟台市中拓合金钢有限责任公司 A kind of powder metallurgy immersion coating stove boiler tube
CN107824757A (en) * 2017-11-28 2018-03-23 宁波江北珂达汽车技术有限公司 Casting device for cylinder sleeve shaping
CN107855485A (en) * 2017-11-28 2018-03-30 宁波江北珂达汽车技术有限公司 The casting method of cylinder sleeve
CN107855485B (en) * 2017-11-28 2019-04-09 宁波江北珂达汽车技术有限公司 The casting method of cylinder sleeve
CN108098265A (en) * 2017-12-13 2018-06-01 太原科技大学 A kind of non-ferrous metal seamless shell production technology
CN109047700A (en) * 2018-07-19 2018-12-21 柳州市创科复合金属陶瓷制品有限公司 A kind of compound body of roll production method of bimetallic

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