CN110421133A - A kind of preparation method of centrifugal casting Ethylene Cracking Furnace Tubes - Google Patents
A kind of preparation method of centrifugal casting Ethylene Cracking Furnace Tubes Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D13/00—Centrifugal casting; Casting by using centrifugal force
- B22D13/02—Centrifugal casting; Casting by using centrifugal force of elongated solid or hollow bodies, e.g. pipes, in moulds rotating around their longitudinal axis
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D13/00—Centrifugal casting; Casting by using centrifugal force
- B22D13/10—Accessories for centrifugal casting apparatus, e.g. moulds, linings therefor, means for feeding molten metal, cleansing moulds, removing castings
- B22D13/101—Moulds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D13/00—Centrifugal casting; Casting by using centrifugal force
- B22D13/10—Accessories for centrifugal casting apparatus, e.g. moulds, linings therefor, means for feeding molten metal, cleansing moulds, removing castings
- B22D13/101—Moulds
- B22D13/105—Cooling for moulds or cores
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C11/00—Aliphatic unsaturated hydrocarbons
- C07C11/02—Alkenes
- C07C11/04—Ethylene
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C4/00—Preparation of hydrocarbons from hydrocarbons containing a larger number of carbon atoms
- C07C4/02—Preparation of hydrocarbons from hydrocarbons containing a larger number of carbon atoms by cracking a single hydrocarbon or a mixture of individually defined hydrocarbons or a normally gaseous hydrocarbon fraction
- C07C4/04—Thermal processes
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G9/00—Thermal non-catalytic cracking, in the absence of hydrogen, of hydrocarbon oils
- C10G9/14—Thermal non-catalytic cracking, in the absence of hydrogen, of hydrocarbon oils in pipes or coils with or without auxiliary means, e.g. digesters, soaking drums, expansion means
- C10G9/18—Apparatus
- C10G9/20—Tube furnaces
- C10G9/203—Tube furnaces chemical composition of the tubes
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/023—Alloys based on nickel
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
- C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
- C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
- C22C19/055—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being at least 20% but less than 30%
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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Abstract
A kind of preparation method of centrifugal casting Ethylene Cracking Furnace Tubes, belongs to Ethylene Cracking Furnace Tubes technical field.Using the alloy molten solution of electro-smelting casting furnance tube, the chemical composition and its mass fraction of alloy molten solution are 0.38-0.47%C, 28.16-28.39%Cr, 0.42-0.49%Mn, < 0.025%P, < 0.020%S, < 3.3%Fe, 2.44-2.58%Si, 1.83-1.95%W, 9.44-9.70%Mo, 2.84-2.98%Nb, 0.037-0.051%La, 0.040-0.055%Y, 0.032-0.048%Ce, 0.53-0.68%Zr, surplus Ni；Alloy molten solution is warming up to 1723-1738 DEG C, the aluminium of 0.3-0.4% is added, after heat preservation 3-4 minutes, then it comes out of the stove to ladle, using horizontal centrifuge cast form, the boiler tube dense structure of acquisition, uniform wall thickness, long service life, promoting and applying has good economic and social benefit.
Description
Technical field
The invention discloses a kind of preparation method of Ethylene Cracking Furnace Tubes, in particular to a kind of centrifugal casting cracking of ethylene
The preparation method of furnace boiler tube belongs to Ethylene Cracking Furnace Tubes technical field.
Background technique
Boiler tube is the critical component in ethane cracking furnace, is worked under high temperature environment for a long time, and the easy dross of boiler tube, high temperature are compacted
Become, therefore more stringent requirements are proposed to the compactness of the high-temperature behavior of boiler tube, especially boiler tube.The longevity is used in order to improve boiler tube
Life, Chinese invention patent CN106554798 disclose a kind of processing method of pyrolysis furnace nichrome boiler tube, this method packet
It includes: under low oxygen partial pressure gas atmosphere, nichrome boiler tube being warming up to by 550-700 with the first heating speed of 55-150 DEG C/h
DEG C, and 5-50 hours are kept the temperature, then nichrome boiler tube is warming up to by 750-1100 with the second heating rate lower than 150 DEG C/h
DEG C, and 5-100 hours are kept the temperature, nichrome boiler tube is then cooled to 40 DEG C or less with the cooling rate lower than 150 DEG C/h；Its
In, enhanced heat transfer member is provided in the nichrome boiler tube.It is used by using the pyrolysis furnace that the inventive method is handled
Nichrome boiler tube can significantly extend the operation cycle of pyrolysis furnace.Chinese invention patent CN 106554797 also discloses one
The processing method of kind of pyrolysis furnace nichrome boiler tube, this method comprises: under low oxygen partial pressure gas atmosphere, with lower than 150 DEG C/
Nichrome boiler tube is warming up to 600-1100 DEG C by the heating rate of h, and keeps the temperature 5-100 hours；Wherein, the nichrome furnace
Enhanced heat transfer member is provided in pipe.The pyrolysis furnace nichrome boiler tube handled by using the inventive method, can
The significant operation cycle for extending pyrolysis furnace.Chinese invention patent CN106554799 also discloses a kind of pyrolysis furnace nichrome
Boiler tube and preparation method thereof, the nichrome boiler tube of the invention include: boiler tube, the enhanced heat transfer member being set in boiler tube and
It is formed in the oxidation film of boiler tube inner surface, the oxidation film contains one of Cr, Mn, Ni, Fe, Al and Si or multiple element
Oxide.The pyrolysis furnace of the invention is formed with nichrome boiler tube in its inner surface, and there is the inertia of high thermal stability to protect
Film is able to suppress or slows down catalytic coking phenomenon；Meanwhile it being internally provided with enhanced heat transfer member in boiler tube, fluid can be changed
Flow regime improves the coefficient of heat conduction, reduces Free radical coke and polycondensation coking.Chinese invention patent CN106591796 is also public
A kind of new online method for preparing manganese picotite coating in cracking furnace pipe inner surface has been opened, this approach includes the following steps,
1) preprocessing solution containing chromium compound and manganese compound and carrier gas are injected into cracking after coke cleaning operation by cracking furnace tube
In the cracking furnace pipe that heater outlet temperature is 400-1000 DEG C, and vapor deposition 2-24h is carried out in boiler tube inner wall；2) it is being vapor-deposited
Afterwards, at 700-1100 DEG C, under the atmosphere containing inert gas and the mixed gas of oxidizing gas, it is passivated processing 1-
10 hours.
Chinese invention patent CN 107881393 also discloses a kind of method for preparing the anti-coking alloy material and one
Kind anti-coking cracking furnace pipe.The anti-coking alloy material include alloy material matrix and be coated on the alloy material matrix surface
Coat, metal oxide and metal sulfide containing metallic element in the alloy material matrix in the coat,
Relative to the volume of the coat, the content of the metal oxide is 75.1-85 volume %, and the metal sulfide contains
Amount is 15-24.9 volume %.The anti-coking alloy material of the invention can effectively inhibit coking and can protect the long period
Hold anticoking capability.Chinese invention patent CN 107881431 also disclose a kind of method for preparing the anti-coking alloy material with
And a kind of anti-coking cracking furnace pipe.The anti-coking alloy material include alloy material matrix and be coated on the alloy material matrix
The coat on surface, metal oxide and metal sulfide containing metallic element in alloy material matrix in the coat,
Relative to the volume of the coat, the content of the metal oxide is 65-75 volume %, the content of the metal sulfide
For 25-35 volume %.The anti-coking alloy material of the invention can effectively inhibit coking and can keep anti-the long period
Coking behavior.Chinese invention patent CN 107881459 also discloses a kind of method using coating gas coating cracking furnace pipe
And the cracking furnace pipe that this method obtains.The coating gas contains sulfide, vapor and carrier gas, with the coating gas
Total volume meter, the content of the sulfide are 0.01-0.1 volume %, and the content of the vapor is 20.1-69.9 volume %,
The content of the carrier gas is 30-79.89 volume %.The method of the coating cracking furnace pipe of the invention can be in the interior table of cracking furnace pipe
Face coats one layer of not flaky coat, which can substantially completely cover Fe, Ni element of cracking furnace pipe inner surface
The phenomenon that covering, cracking furnace pipe coking can be effectively inhibited.Chinese invention patent CN 106590725 also discloses a kind of processing
The method of cracking furnace pipe inner surface, wherein this method includes using containing sulphur vapor, vapor and low oxygen partial pressure gas
Admixture of gas handles cracking furnace pipe inner surface, to form oxidation film and sulfide film in boiler tube inner surface.The invention mentions
The simple process of the processing cracking furnace pipe inner surface of confession, the oxidation film and sulfide film of formation can effectively cover cracking furnace pipe inner wall
Fe, Ni element, can by the coke deposited in cracking furnace pipe inner wall reduce 80% or more.Chinese invention patent CN
105039827 also disclose a kind of effective microalloying 35Cr45NiNb steel alloy of ethane cracking furnace, are single with mass percent
Position, containing C:0.40~0.50, Si:1.20~1.80, Mn:0.60~1.20, P:0.001~0.020, S:0.001~
0.010, Cr:35~36, Ni:45~46, Nb:0.80~1.50, W:0.005~0.20, Mo:0.005~0.20, Cu:0.005
~0.30, Al:0.005~0.20, Ti:0.05~0.10, Zr:0.05~0.10, B:0.0010~0.0050, As:0~
0.0020, Sn:0~0.0020, Pb:0~0.0020, Bi:0~0.0001, surplus Fe.The steel alloy requires column crystal to account for wall
Thick percentage is greater than 70%, and grain size number is 5~6 grades.The invention can effectively promote the high-temperature and durable of ethylene cracking tube
Can, meet it under the conditions of 1100 DEG C, 17MPa, high-temperature and durable rupture time is greater than requirement in 100 hours, to reach guarantor
Hinder the purpose of cracking of ethylene furnace apparatus long period safe operation.Chinese invention patent CN105039873 has also disclosed a kind of second
Alkene cracking furnace pipe microalloying 25Cr35NiNb welding wire, it is characterised in that: as unit of mass percent, containing C:0.40~
0.45, Si:1.70~1.90, Mn:1.20~1.50, P:0.005~0.010, S:0.002~0.010, Cr:25~26, Ni:
34~36, Nb:1.00~1.20, W:0.50~1.00, Mo:0.10~0.30, Cu:0.025~0.050, Al:0.10~
0.20, Ti:0.05~0.15, Co:0.04~0.06, B:0.0010~0.0050, Pb:0~0.0020, Bi:0~0.0001,
Surplus is Fe.The invention can effectively promote the high temperature endurance performance of ethylene cracking tube welding point, make its meet 1050 DEG C,
High-temperature and durable rupture time is greater than requirement in 100 hours under 25MPa experimental condition, ensures that cracking of ethylene furnace apparatus is long to reach
The purpose of period safe operation.Chinese invention patent CN 105087045 also discloses a kind of anti-coking cracking furnace pipe, comprising: furnace
Pipe matrix, enhanced heat transfer member, boiler tube inner surface oxidation film, the boiler tube matrix element composition include Fe, Cr, Ni, Mn,
Si, C and microelement；Microelement is one of Al, Nb, Ti, W, Mo, La, Ce, Y, Nd, Pr, Gd, Dy, Sm or combination；
The weight percentage of Mn and Si meets following formula: the oxidation film of the boiler tube inner surface be after low oxygen partial pressure is handled,
In the oxidation film for the anti-coking that the boiler tube inner surface is formed；The coverage rate of oxidation film is not less than 80%, the thickness of oxidation film
It is 0.5-5 μm.Using the method for the invention, coke is substantially reduced in the deposition of boiler tube inner surface, and coil runlength obviously prolongs
It is long.
But Ethylene Cracking Furnace Tubes bore is small, wall thickness is thin, and size is long, using ordinary sand casting or lost foam casting
The methods of manufacture Ethylene Cracking Furnace Tubes, hardly result in qualified boiler tube product.Centrifugal casting has casting compactness higher, gas
The defects of hole, slag inclusion, is few, and comprehensive mechanical property is good, also reduces even without running and feeding system, reduces metal consumption, improve
Product yield.But it using common centre spinning method, is poured wall thickness and is less than 15mm, length is greater than 4000mm, and internal diameter is less than
The small-diameter ultra-long thin-walled Ethylene Cracking Furnace Tubes of 80mm, the generally existing wall unevenness of boiler tube is even, organizes not fine and close, boiler tube use
In it is easily-deformable and cracking the deficiencies of.
Summary of the invention
The purpose of the present invention is overcome the deficiencies in the prior art to improve furnace tube high temperature performance by change furnace tube material, and
Change boiler tube centrifugal casting technique, improves boiler tube inherent quality.
A kind of preparation method of centrifugal casting Ethylene Cracking Furnace Tubes, using electro-smelting furnace tube material, using it is horizontal from
Scheming cast form, casting wall thickness are less than 15mm, and length is greater than 4000mm, and internal diameter is less than the small-diameter ultra-long thin-walled ethylene of 80mm
Cracking furnace tube, specific step of preparation process is:
1. the alloy molten solution of the first melting and casting boiler tube in electric furnace, the chemical composition and its mass fraction of alloy molten solution are
0.38-0.47%C, 28.16-28.39%Cr, 0.42-0.49%Mn, < 0.025%P, < 0.020%S, < 3.3%Fe, 2.44-
2.58%Si, 1.83-1.95%W, 9.44-9.70%Mo, 2.84-2.98%Nb, 0.037-0.051%La, 0.040-
0.055%Y, 0.032-0.048%Ce, 0.53-0.68%Zr, surplus Ni；Alloy molten solution is warming up to 1723-1738 DEG C, is added
Enter the aluminium of 0.3-0.4% then to come out of the stove after heat preservation 3-4 minutes to ladle；
2. use chemical composition and its mass fraction for 0.27-0.34%C, 1.63-1.75%Ni, 3.07-3.24%Mo,
1.48-1.59%Nb, 1.07-1.22%Ta, 0.63-0.81%Si, 0.54-0.67%Mn, < 0.020%P, < 0.018%S,
The multicomponent alloy forged steel of surplus Fe manufactures casting mold, and zircon flour coating, paint thickness 1.5-2.0mm are applied in casting mold, and casting mold is placed in
On horizontal centrifuge；1. the alloy molten solution in ladle is after skimming for step, when temperature is 1676-1683 DEG C, pour into it is horizontal from
In the heart in high-speed rotating casting mold, 850-880 DEG C of mold temperature, 1800-1850 revs/min of casting mold revolving speed；Alloy molten solution is whole
Into after casting mold 100-120 seconds, water-spraying control is carried out to casting mold, controls the solidification cooling of alloy molten solution in casting mold
80-100 DEG C/min；Water spray stopped water-spraying control, when casting temperature is down to 1000 DEG C or less, centrifuge stops after 180-210 seconds
Machine, and casting is taken out from casting mold into holding pit slow cooling, after holding pit slow cooling is to 80 DEG C hereinafter, carrying out polishing cleaning, i.e.,
It can get centrifugal casting Ethylene Cracking Furnace Tubes.
A kind of preparation method of centrifugal casting Ethylene Cracking Furnace Tubes of the present invention can be with using electro-smelting furnace tube material
Ensure the quality of molten metal.Using horizontal centrifuge cast form, boiler tube consistency can be improved, casting wall thickness is less than
15mm, length are greater than 4000mm, and internal diameter is less than the small-diameter ultra-long thin-walled Ethylene Cracking Furnace Tubes of 80mm.The first melting in electric furnace
The alloy molten solution of casting furnance tube, the chemical composition and its mass fraction of alloy molten solution are 0.38-0.47%C, 28.16-28.39%
Cr, 0.42-0.49%Mn, < 0.025%P, < 0.020%S, < 3.3%Fe, 2.44-2.58%Si, 1.83-1.95%W,
9.44-9.70%Mo, 2.84-2.98%Nb, 0.037-0.051%La, 0.040-0.055%Y, 0.032-0.048%Ce,
0.53-0.68%Zr, surplus Ni；0.38-0.47%C is added, is to improve alloy molten solution mobility, part carbon and alloy member
Element combines, and the alloy carbide of small and dispersed can be generated, and is conducive to the anti-coking performance for improving boiler tube.28.16- is added
28.39%Cr main function is that the oxidation-resistance property for improving boiler tube, especially carbon and chromaking are closed, in boiler tube cooling procedure
In, the Cr of diffusion-precipitation distribution23C6, be conducive to the anti-coking performance for improving boiler tube.1.83-1.95%W, 9.44- is added
Furnace tube high temperature intensity can be improved in 9.70%Mo, 2.84-2.98%Nb, and especially above-mentioned element is partially solid-solution in Ni substrate
Afterwards, furnace tube high temperature calorific intensity is increased substantially.2.44-2.58%Si is added, boiler tube oxidation resistance can also be improved.It is added
After 0.42-0.49%Mn and 2.44-2.58%Si, good pre-deoxidation can be played to alloy molten solution.0.037-0.051%
The compound addition of La, 0.040-0.055%Y, 0.032-0.048%Ce and 0.53-0.68%Zr, can improve boiler tube anti-coking
Ability, and improve furnace tube high temperature intensity.Alloy molten solution is warming up to 1723-1738 DEG C, the aluminium that 0.3-0.4% is added take off eventually
Then oxygen is come out of the stove after heat preservation 3-4 minutes to ladle.
Alloy molten solution in ladle, when temperature is 1676-1683 DEG C, is poured on horizontal centrifuge and is revolved at a high speed after skimming
In the casting mold turned.Casting mold uses chemical composition and its mass fraction for 0.27-0.34%C, 1.63-1.75%Ni, 3.07-
3.24%Mo, 1.48-1.59%Nb, 1.07-1.22%Ta, 0.63-0.81%Si, 0.54-0.67%Mn, < 0.020%P, <
The multicomponent alloy forged steel of 0.018%S, surplus Fe manufacture, and manufacture casting mold using above-mentioned material, and room temperature and elevated temperature strength are high, plasticity,
Good toughness, especially casting mold resist hot and cold impact capacity with good.Zircon flour coating, paint thickness 1.5- are applied in casting mold
2.0mm plays the role of protecting casting mold and promotes casting demoulding.In order to ensure using centrifuge, it is small to cast out high quality wall thickness
In 15mm, length is greater than 4000mm, and internal diameter is less than the small-diameter ultra-long thin-walled Ethylene Cracking Furnace Tubes of 80mm, first has to improve and close
Golden melt pouring temperature improves the mobility of alloy molten solution to 1676-1683 DEG C, furthermore to ensure that mold temperature when being poured is
850-880 DEG C, it is ensured that can uniformly be covered with alloy molten solution in casting mold.In order to ensure casting is fine and close, casting mold revolving speed 1800-1850 turns/
Minute.After alloy molten solution fully enters casting mold 100-120 seconds, water-spraying control is carried out to casting mold, makes the solidifying of alloy molten solution in casting mold
Gu cooling velocity is controlled at 80-100 DEG C/min, water cooling can accelerate alloy molten solution solidification cooling, it is ensured that micro- group of casting
Knit it is tiny, be evenly distributed and densify.Water spray stops water-spraying control, prevents internal stress excessive, lead to casting after 180-210 seconds
Cracking.When casting temperature is down to 1000 DEG C or less, centrifuge is shut down, and casting is taken out from casting mold into holding pit slow cooling, can
Further to eliminate casting internal stress.After holding pit slow cooling is to 80 DEG C hereinafter, carrying out polishing cleaning, centrifugal casting can be obtained
Ethylene Cracking Furnace Tubes.
Boiler tube of the present invention compared with prior art, has the advantage that
1) boiler tube microscopic structure of the present invention is tiny, fine and close, boiler tube uniform wall thickness, and Wall-Thickness Difference is less than 0.3mm；
2) boiler tube of the present invention is prepared using centre spinning method, and simple process is high-efficient；
3) boiler tube of the present invention has excellent anti-coking performance, extends the furnace tube operation time；
4) boiler tube of the present invention high-temperature and durable rupture time under 1050 DEG C, 25MPa experimental condition is greater than 200 hours, thus
Achieve the purpose that ensure the safe operation of cracking of ethylene furnace apparatus long period.
Specific embodiment
The present invention is further described with reference to embodiments, but the present invention is not limited to following embodiments.
Embodiment 1:
A kind of preparation method of centrifugal casting Ethylene Cracking Furnace Tubes, using 1500 kilograms of medium-frequency induction furnace melting boiler tubes
Material casts wall thickness 12mm, the small-diameter ultra-long thin-walled of length 4500mm, internal diameter 75mm using horizontal centrifuge cast form
Ethylene Cracking Furnace Tubes, specific step of preparation process is:
1. the alloy molten solution of the first melting and casting boiler tube in 1500 kilograms of medium-frequency induction furnaces, the chemical composition of alloy molten solution
And its mass fraction be 0.38%C, 28.39%Cr, 0.42%Mn, 0.023%P, 0.017%S, 2.09%Fe, 2.58%Si,
1.83%W, 9.70%Mo, 2.84%Nb, 0.051%La, 0.040%Y, 0.048%Ce, 0.53%Zr, surplus Ni；By alloy
Melt is warming up to 1738 DEG C, and 0.4% aluminium is added and then comes out of the stove after heat preservation 4 minutes to ladle；
2. using chemical composition and its mass fraction for 0.27%C, 1.75%Ni, 3.07%Mo, 1.59%Nb, 1.07%
Ta, 0.81%Si, 0.54%Mn, 0.015%P, 0.012%S, the multicomponent alloy forged steel of surplus Fe manufacture casting mold, apply in casting mold
Zircon flour coating, paint thickness 1.5-1.7mm are applied, casting mold is placed on horizontal centrifuge；The step 1. alloy molten solution warp in ladle
After skimming, when temperature is 1683 DEG C, pour on horizontal centrifugal in high-speed rotating casting mold, 850-860 DEG C of mold temperature, casting mold
1800 revs/min of revolving speed；After alloy molten solution fully enters casting mold 100 seconds, water-spraying control is carried out to casting mold, keeps alloy in casting mold molten
The solidification cooling of liquid is controlled at 80-100 DEG C/min；Water spray stopped water-spraying control after 180 seconds, and casting temperature is down to 1000
DEG C or less when, centrifuge is shut down, and casting is taken out from casting mold into holding pit slow cooling, in holding pit slow cooling to 80 DEG C hereinafter,
After carrying out polishing cleaning, it can be obtained centrifugal casting Ethylene Cracking Furnace Tubes.
Embodiment 2:
A kind of preparation method of centrifugal casting Ethylene Cracking Furnace Tubes, using 3000 kilograms of medium-frequency induction furnace melting boiler tubes
Material casts wall thickness 14mm, the small-diameter ultra-long thin-walled of length 5000mm, internal diameter 60mm using horizontal centrifuge cast form
Ethylene Cracking Furnace Tubes, specific step of preparation process is:
1. the alloy molten solution of the first melting and casting boiler tube in 3000 kilograms of medium-frequency induction furnaces, the chemical composition of alloy molten solution
And its mass fraction be 0.47%C, 28.16%Cr, 0.49%Mn, 0.021%P, 0.010%S, 2.39%Fe, 2.44%Si,
1.95%W, 9.44%Mo, 2.98%Nb, 0.037%La, 0.055%Y, 0.032%Ce, 0.68%Zr, surplus Ni；By alloy
Melt is warming up to 1723 DEG C, and 0.3% aluminium is added and then comes out of the stove after heat preservation 3 minutes to ladle；
2. using chemical composition and its mass fraction for 0.34%C, 1.63%Ni, 3.24%Mo, 1.48%Nb, 1.22%
Ta, 0.63%Si, 0.67%Mn, 0.015%P, 0.011%S, the multicomponent alloy forged steel of surplus Fe manufacture casting mold, apply in casting mold
Zircon flour coating, paint thickness 1.9-2.0mm are applied, casting mold is placed on horizontal centrifuge；The step 1. alloy molten solution warp in ladle
After skimming, when temperature is 1676 DEG C, pour on horizontal centrifugal in high-speed rotating casting mold, 870-880 DEG C of mold temperature, casting mold
1850 revs/min of revolving speed；After alloy molten solution fully enters casting mold 120 seconds, water-spraying control is carried out to casting mold, keeps alloy in casting mold molten
The solidification cooling of liquid is controlled at 80-100 DEG C/min；Water spray stopped water-spraying control after 210 seconds, and casting temperature is down to 1000
DEG C or less when, centrifuge is shut down, and casting is taken out from casting mold into holding pit slow cooling, in holding pit slow cooling to 80 DEG C hereinafter,
After carrying out polishing cleaning, it can be obtained centrifugal casting Ethylene Cracking Furnace Tubes.
Embodiment 3:
A kind of preparation method of centrifugal casting Ethylene Cracking Furnace Tubes, using 3 tons of arc melting furnace tube materials, using sleeping
Formula centrifuge cast form, casts wall thickness 10mm, and length is greater than 4800mm, the small-diameter ultra-long thin-walled cracking of ethylene of internal diameter 70mm
Furnace boiler tube, specific step of preparation process is:
1. the alloy molten solution of the first melting and casting boiler tube in 3 tons of electric arc furnaces, the chemical composition and its quality point of alloy molten solution
Number be 0.41%C, 28.29%Cr, 0.47%Mn, 0.020%P, 0.013%S, 1.77%Fe, 2.51%Si, 1.88%W,
9.56%Mo, 2.89%Nb, 0.042%La, 0.049%Y, 0.035%Ce, 0.57%Zr, surplus Ni；Alloy molten solution is heated up
To 1734 DEG C, 0.35% aluminium is added and then comes out of the stove after heat preservation 3.5 minutes to ladle；
2. using chemical composition and its mass fraction for 0.29%C, 1.68%Ni, 3.17%Mo, 1.53%Nb, 1.12%
Ta, 0.75%Si, 0.59%Mn, 0.012%P, 0.008%S, the multicomponent alloy forged steel of surplus Fe manufacture casting mold, apply in casting mold
Zircon flour coating, paint thickness 1.7-1.8mm are applied, casting mold is placed on horizontal centrifuge；The step 1. alloy molten solution warp in ladle
After skimming, when temperature is 1679 DEG C, pour on horizontal centrifugal in high-speed rotating casting mold, 860-870 DEG C of mold temperature, casting mold
1840 revs/min of revolving speed；After alloy molten solution fully enters casting mold 110 seconds, water-spraying control is carried out to casting mold, keeps alloy in casting mold molten
The solidification cooling of liquid is controlled at 80-100 DEG C/min；Water spray stopped water-spraying control after 190 seconds, and casting temperature is down to 1000
DEG C or less when, centrifuge is shut down, and casting is taken out from casting mold into holding pit slow cooling, in holding pit slow cooling to 80 DEG C hereinafter,
After carrying out polishing cleaning, it can be obtained centrifugal casting Ethylene Cracking Furnace Tubes.
Boiler tube microscopic structure of the present invention is tiny, fine and close, and the Wall-Thickness Difference of boiler tube uniform wall thickness, above-described embodiment is respectively less than
0.3mm。
Boiler tube of the present invention is prepared using centre spinning method, and simple process is high-efficient；Boiler tube of the present invention has excellent resist
Coking ability, after 2 years, coking thickness is less than 2mm, and (wherein embodiment 1 is 1.87mm, and embodiment 2 is 1.86mm, is implemented
Example 3 is 1.90mm), the furnace tube operation time is extended, labor intensity of workers is alleviated.
The boiler tube of the above embodiment of the present invention high-temperature and durable rupture time under the conditions of 1050 DEG C, 25MPa proof stress is equal
Greater than 200 hours (wherein embodiment 1 is 237 hours, and embodiment 2 is 244 hours, and embodiment 3 is 238 hours), to reach
Ensure the purpose of cracking of ethylene furnace apparatus long period safe operation.Boiler tube of the present invention is promoted, there is good economy and society effect
Benefit.
Claims (2)
1. a kind of preparation method of centrifugal casting Ethylene Cracking Furnace Tubes, using electro-smelting furnace tube material, using horizontal centrifugal
Machine cast form, casting wall thickness are less than 15mm, and length is greater than 4000mm, and small-diameter ultra-long thin-walled ethylene of the internal diameter less than 80mm is split
Furnace boiler tube is solved, specific step of preparation process includes the following:
1. the alloy molten solution of the first melting and casting boiler tube in electric furnace, the chemical composition and its mass fraction of alloy molten solution are 0.38-
0.47%C, 28.16-28.39%Cr, 0.42-0.49%Mn, < 0.025%P, < 0.020%S, < 3.3%Fe, 2.44-
2.58%Si, 1.83-1.95%W, 9.44-9.70%Mo, 2.84-2.98%Nb, 0.037-0.051%La, 0.040-
0.055%Y, 0.032-0.048%Ce, 0.53-0.68%Zr, surplus Ni；Alloy molten solution is warming up to 1723-1738 DEG C, is added
Enter the aluminium of 0.3-0.4% then to come out of the stove after heat preservation 3-4 minutes to ladle；
2. use chemical composition and its mass fraction for 0.27-0.34%C, 1.63-1.75%Ni, 3.07-3.24%Mo,
1.48-1.59%Nb, 1.07-1.22%Ta, 0.63-0.81%Si, 0.54-0.67%Mn, < 0.020%P, < 0.018%S,
The multicomponent alloy forged steel of surplus Fe manufactures casting mold, and zircon flour coating, paint thickness 1.5-2.0mm are applied in casting mold, and casting mold is placed in
On horizontal centrifuge；1. the alloy molten solution in ladle is after skimming for step, when temperature is 1676-1683 DEG C, pour into it is horizontal from
In the heart in high-speed rotating casting mold, 850-880 DEG C of mold temperature, 1800-1850 revs/min of casting mold revolving speed；Alloy molten solution is whole
Into after casting mold 100-120 seconds, water-spraying control is carried out to casting mold, controls the solidification cooling of alloy molten solution in casting mold
80-100 DEG C/min；Water spray stopped water-spraying control, when casting temperature is down to 1000 DEG C or less, centrifuge stops after 180-210 seconds
Machine, and casting is taken out from casting mold into holding pit slow cooling, after holding pit slow cooling is to 80 DEG C hereinafter, carrying out polishing cleaning, i.e.,
It can get centrifugal casting Ethylene Cracking Furnace Tubes.
2. the Ethylene Cracking Furnace Tubes obtained according to the method for claim 1.
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| CN103409665A (en) * | 2013-07-02 | 2013-11-27 | 青岛新力通工业有限责任公司 | Chromium-nickel alloy high-temperature dusting corrosion resistance furnace tube and centrifugal casting production method thereof |
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| CN201596752U (en) * | 2009-10-29 | 2010-10-06 | 上海卓然工程技术有限公司 | Novel centrifugal casting furnace tube model |
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