CN101596573B - Method for manufacturing transition section of conical head of coke tower - Google Patents
Method for manufacturing transition section of conical head of coke tower Download PDFInfo
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- CN101596573B CN101596573B CN200910059464A CN200910059464A CN101596573B CN 101596573 B CN101596573 B CN 101596573B CN 200910059464 A CN200910059464 A CN 200910059464A CN 200910059464 A CN200910059464 A CN 200910059464A CN 101596573 B CN101596573 B CN 101596573B
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000000571 coke Substances 0.000 title claims abstract description 25
- 230000007704 transition Effects 0.000 title claims abstract description 17
- 238000005242 forging Methods 0.000 claims abstract description 63
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 42
- 239000010959 steel Substances 0.000 claims abstract description 42
- 238000007670 refining Methods 0.000 claims abstract description 23
- 238000010438 heat treatment Methods 0.000 claims abstract description 17
- 230000008569 process Effects 0.000 claims abstract description 13
- 238000000465 moulding Methods 0.000 claims abstract description 9
- 238000005266 casting Methods 0.000 claims abstract description 6
- 238000009847 ladle furnace Methods 0.000 claims abstract description 6
- 238000005457 optimization Methods 0.000 claims abstract description 5
- 238000003466 welding Methods 0.000 claims description 26
- 238000001514 detection method Methods 0.000 claims description 16
- 238000005516 engineering process Methods 0.000 claims description 15
- 229910052739 hydrogen Inorganic materials 0.000 claims description 9
- 239000012535 impurity Substances 0.000 claims description 8
- 238000013003 hot bending Methods 0.000 claims description 6
- 229910052748 manganese Inorganic materials 0.000 claims description 6
- 229910052710 silicon Inorganic materials 0.000 claims description 6
- 241001062472 Stokellia anisodon Species 0.000 claims description 5
- 239000001257 hydrogen Substances 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 4
- 238000007493 shaping process Methods 0.000 claims description 4
- 230000008602 contraction Effects 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 238000006356 dehydrogenation reaction Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 238000005496 tempering Methods 0.000 claims description 3
- 241000887125 Chaptalia nutans Species 0.000 claims description 2
- 238000004140 cleaning Methods 0.000 claims description 2
- 238000005520 cutting process Methods 0.000 claims description 2
- 238000003754 machining Methods 0.000 claims description 2
- 238000005498 polishing Methods 0.000 claims description 2
- 230000003746 surface roughness Effects 0.000 claims description 2
- 238000003723 Smelting Methods 0.000 abstract description 5
- 230000010354 integration Effects 0.000 abstract 1
- 238000009849 vacuum degassing Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 9
- 239000007769 metal material Substances 0.000 description 6
- 239000003921 oil Substances 0.000 description 6
- 208000037656 Respiratory Sounds Diseases 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000012797 qualification Methods 0.000 description 3
- 241000196324 Embryophyta Species 0.000 description 2
- 229910052785 arsenic Inorganic materials 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000004939 coking Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 238000011946 reduction process Methods 0.000 description 2
- 229910052718 tin Inorganic materials 0.000 description 2
- 206010011376 Crepitations Diseases 0.000 description 1
- 208000034189 Sclerosis Diseases 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005235 decoking Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000003502 gasoline Substances 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000002006 petroleum coke Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention relates to a method for manufacturing the transition section of a conical seal head of a coke tower, including steel ingot optimization, forging process and cold and hot molding process. The method is characterized in that the steel ingot optimization and the forging process include the following steps: 1) steel ingot refining: selecting and smelting low S-P steel in an electric furnace, refining the steel in a ladle furnace, and carrying out vacuum degassing and vacuum ingot casting; 2) forging and molding; and 3) heat treatment after forging. The method has the advantages of shortened manufacturing cycle, reduced manufacturing cost, high product quality, effective integration of resource and shortened manufacturing cycle.
Description
Technical field:
The present invention relates to large-scale petrochemical refining equipment manufacturing approach, particularly relate to method for manufacturing transition section of conical head of coke tower.
Background technology:
Coke drum is the key equipment of oil refinery device, and its effect is to make heavy oil product heating pyrolyze polymerization becoming light oil, intermediate oil and coke, and major product is: gas, gasoline, diesel oil, wax oil, petroleum coke.During this equipment operation is work under the effect of alternate load, and operating temperature reaches 500 ℃, and working environment is comparatively abominable.Its bottom conical head and cylindrical shell, skirt junction are the maximum positions of STRESS VARIATION, and the easiest defective that influences the device security performance such as crack has directly determined the life cycle of whole coking tower its service life.Traditional manufacturing process is that whole coke drum integral body all adopts the plate welding structure, and this structure has just produced crackle at the several all after date bottom conical heads of device operation and cylindrical shell, skirt junction, has become the maximum hidden danger of safety in production.
The traditional handicraft of domestic present employing: steel-making-hydraulic press is swaged into arc-assembly welding-disappear and answers heat treatment-vertical lathe processing.The problem of its existence is that the made cost is high; Each is about 100 tons product blank weight, forging blank utilization rate low (being merely 1/10th), and the mechanical performance to forging exerts an influence during hot bending; Its high-temperature mechanical property and low-temperature impact toughness are difficult for reaching requirement, and the manufacturing cycle is long
(about 8～10 months).
The prior art particular problem is following:
1. transition section of conical head is by 4 groups welding to be formed, and its diameter all between φ 8400～φ 9500mm, belongs to the Large-scale Forging welding structure, and manufacturing process is many, and quality requirement is high, and technical difficulty is big;
2. the strict control of forging material impurity element total amount, requiring impact flexibility is 2 times of general material, steel are smelted and to forge difficulty big;
3. because forging thickness and diameter are bigger, and groove is dual U-shaped, organizes big to difficulty;
Be prone to produce cold crack or delayed crack when 4. 14Cr1Mo, 15CrMo, 1.25Cr-0.5Mo-Si equal pressure container weld with steel; Problems such as district's sclerosis of nearly seam and heat affected area are softening; Weld preheating during welding, interlayer temperature are controlled, postwelding disappears, and the hydrogen difficulty is big, so must possess rational welding;
5. the whole delivery of product requirement organize greatly to the parts welding capacity, is prone to cause commissure intensity and hardness higher and impact flexibility descends, need selection proper heat treatment technology.
Summary of the invention:
The present invention has improved the service life of key equipment coke drum in the petrochemical plant, reduces cost of goods manufactured, shortens the manufacturing cycle; Reduce of the dependence of domestic petroleum petrochemical industry, satisfy the demand of petrochemical industry for the large pressurized vessel equipment for this product import.
Technical scheme of the present invention is following:
Method for manufacturing transition section of conical head of coke tower comprises and optimizes steel ingot, forging technology and hot and cold processing and forming technology, and it is characterized in that: said optimization steel ingot, forging technology may further comprise the steps:
1) refining steel ingot: select the high-quality steel scrap of low S, the low impurity of P for use, in electric furnace, smelt, again through ladle furnace refining, vacuum outgas, vacuum-casting;
2) forging moulding: with the refining steel ingot of substance about 15T, on the forging make-up machine more than the 4000T, dial longly through twice jumping-up, be forged into bar shaped again, forging ratio is more than or equal to 6.
3) forge after-baking: comprise positive tempering, even tissueization, dehydrogenation process; Temperature is controlled at 900-1000 ℃, and the samming time guarantees more than 3 hours, then cooling fast.
After the said refining steel ingot operation, the quality proportion of S is smaller or equal to 0.01% in the steel ingot, and the quality proportion of P is smaller or equal to 0.01%; The quality proportion of C is smaller or equal to 0.17%; The mass ratio of Si is great in 0.44% and less than 0.86%, and the mass ratio of Mn is great in 0.27% and less than 0.83%, and the mass ratio of Mo is great in 0.4% and less than 0.7%; The mass ratio of Cr is great in 0.94% and less than 1.56%, and H is smaller or equal to 2PPm.
Carry out service check after the above-mentioned heat treatment: sampling detects to forge after-baking and strengthen heat treatment each item index whether meet standard at the forging stock two ends respectively.
The quality proportion sum of Mn and Si is smaller or equal to 1.2% in the said refining steel ingot.
Said forging make-up machine is an oil pressure cold forming forging machine.
Said forging make-up machine is a hydraulic pressure hot bending forging machine.
The invention has the advantages that:
Coking tower bottom conical head and cylindrical shell, skirt linkage section are adopted forging form (being transition section of conical head), just can solve the problem of coke drum bottom crackle preferably, make extend to 30 years the service life of coke drum from 10 years.It is embodied in:
(1) shortens the manufacturing cycle, reduces manufacturing cost
Changed the technology that in the past adopts super-huge hydraulic press (more than 10000 tons) to forge through the equitable subsection forging; Greatly reduce cost of goods manufactured (only forging blank weight is reduced to about 50 tons for 100 tons from each changeover portion that traditional handicraft requires), shortened the manufacturing cycle, improved the blank utilization rate significantly.
(2) product quality is excellent
, select steel the high-quality steel scrap of low S, the low impurity of P when smelting for use; Elements such as control Sn, Sb, As; Choose reasonable Si, C, Mn content, ladle vacuum refining furnace primary smelting 88～100T molten steel (steel ingot that forging-ring is required) base has so not only reduced the content of S, P; Prevent that effectively hot-short and temper brittleness and crystal boundary from gathering partially, also avoided the unfavorable factors such as composition fluctuation of different batches steel ingot;
Modify-water press hot bending is hydraulic press cold moudling during forging, has avoided the influence of heating to forging blank each item technical performance and index, because its formed precision is higher, improves the blank utilization rate of material equally greatly.
Qualification of welding procedure in strict accordance with qualified is welded, and adopts location-plate to fix, and four weld seam symmetries are welded simultaneously, have effectively controlled the welding deformation amount of product;
Product is POST WELD HEAT TREATMENT OF ENTIRE (carrying out in the heat-treatment furnace of φ 14m), and weld seam and heat affected area hardness are less than HB225.The distortion that local heat treatmet causes and the inhomogeneities of material mechanical performance have been avoided;
(3) effectively integrate resource, shortening manufacturing cycle
Through to domestic reasonable resources utilization, optimize the manufacturing process of various device, manufacturing cycle of this product is shortened to 6 months, for the all-round popularization of this product provides advantageous conditions.
Description of drawings:
Accompanying drawing 1 is the coke drum sketch map;
Accompanying drawing 2 is the transition section of conical head of coke tower structural representation;
The specific embodiment:
Method for manufacturing transition section of conical head of coke tower comprises and optimizes steel ingot, forging technology and hot and cold processing and forming technology, and it is characterized in that: said optimization steel ingot, forging technology may further comprise the steps:
1) refining steel ingot: select the high-quality steel scrap of low S, the low impurity of P for use, in electric furnace, smelt, again through ladle furnace refining, vacuum outgas, vacuum-casting;
2) forging moulding: with the refining steel ingot of substance about 15T, on the forging make-up machine more than the 4000T, dial longly through twice jumping-up, be forged into bar shaped again, forging ratio is more than or equal to 6.
3) forge after-baking: comprise positive tempering, even tissueization, dehydrogenation process; Temperature is controlled at 900-1000 ℃, and the samming time guarantees more than 3 hours, then cooling fast.
After the said refining steel ingot operation, the quality proportion of S is smaller or equal to 0.01% in the steel ingot, and the quality proportion of P is smaller or equal to 0.01%; The quality proportion of C is smaller or equal to 0.17%; The mass ratio of Si is great in 0.44% and less than 0.86%, and the mass ratio of Mn is great in 0.27% and less than 0.83%, and the mass ratio of Mo is great in 0.4% and less than 0.7%; The mass ratio of Cr is great in 0.94% and less than 1.56%, and H is smaller or equal to 2PPm.
Carry out service check after the above-mentioned heat treatment: sampling detects to forge after-baking and strengthen heat treatment each item index whether meet standard at the forging stock two ends respectively.
The quality proportion sum of Mn and Si is smaller or equal to 1.2% in the refining steel ingot, and the forging make-up machine is an oil pressure cold forming forging machine, and the forging make-up machine is a hydraulic pressure hot bending forging machine.
The present invention has improved the service life of key equipment coke drum in the petrochemical plant, reduces cost of goods manufactured, shortens the manufacturing cycle; Reduce of the dependence of domestic petroleum petrochemical industry for this product import,
Satisfy the demand of petrochemical industry for the large pressurized vessel equipment.
Technical scheme of the present invention is following:
A. optimize steel ingot, forging technology.
Concrete steps are following:
1, refining steel ingot: select the steel of low S, P for use, in electric furnace, smelt, again through ladle furnace refining; Vacuum outgas, vacuum-casting, wherein the quality proportion of S is smaller or equal to 0.01%; The quality proportion of P is smaller or equal to 0.01%, and the quality proportion of C is smaller or equal to 0.17%, and the mass ratio of Si is great in 0.44% and less than 0.86%; The mass ratio of Mn is great in 0.27% and less than 0.83%; The mass ratio of Mo is great in 0.4% and less than 0.7%, and the mass ratio of Cr is great in 0.94% and less than 1.56%, and H is smaller or equal to 2PPm.
When smelting, steel guarantee the impurity content of material, the uniformity of composition through advanced smelting process and equipment;
Select the high-quality steel scrap of low S, the low impurity of P for use, in electric furnace, smelt earlier, again through ladle furnace refining, vacuum outgas, vacuum-casting, element such as C, Si, Mn, Mo and harmful element are controlled in the following table scope.
H≤2PPm
And needing to satisfy 1 simultaneously) the quality proportion sum of Mn and Si is smaller or equal to 1.2%
2) the quality proportion sum of Cu, Sn and As is smaller or equal to 15%
The chemical composition measured value is:
2, forging moulding: with the refining steel ingot of substance about 15T, on the forging make-up machine more than the 4000T, dial longly through twice jumping-up, be forged into bar shaped again, forging ratio is more than or equal to 6.When forging ratio is 6, can the forging moulding; When forging ratio is 10, can be forged into type.
The hydraulic press hot bending is shaped and need be heated between 900 ℃-1050 ℃, and the process allowance of shaping blank is very big.Diametric(al) is monolateral to be reached more than the 120mm, and short transverse is monolateral to be reached more than the 100mm; And the hydraulic press cold forming can improve forming accuracy greatly, and the reduction process surplus is in the monolateral 20mm of diametric(al), in the monolateral 15mm of short transverse.
3, forge after-baking:
In the forging of blank, heat treatment, adopt advanced manufacturing process to guarantee each item mechanical performance requirement of material; The heat treatment heating-up temperature should be controlled at 900 ℃-1000 ℃, and the samming time guarantees more than 3 hours.
The mechanical performance requirement
4, service check:
The mechanical performance measured value of 14Cr1Mo, 1.25Cr-0.5Mo-Si forging
B. hot and cold processing and forming technology
5, roughing, flaw detection:
Mill forging stock by the product and the required allowance that is shaped at gantry; Be processed into the strip slab, surface roughness reaches
carry out the UT flaw detection of two vertical direction then.
Flaw detection requires: JB4730-2005, JB4726-2000
6, moulding:
Traditional handicraft is a hot forging forming in the operation forging process, and the process allowance of shaping blank is very big.Diametric(al) is monolateral to be reached more than the 120mm, and short transverse is monolateral to be reached more than the 100mm; Can improve forming accuracy greatly and use the hydraulic press cold forming instead, the reduction process surplus is in the monolateral 20mm of diametric(al), in the monolateral 15mm of short transverse.
7, groove processing:
The thickness direction that on platform, draws, outer processing line and bevel for welding line, the per pass weld bond leaves amount of contraction, and processing bevel for welding, groove carry out MT and detect
8, the group to, the welding:
It is right to organize: with the fixing assembling of location-plate, making the joint fit-up gap is zero;
Welding: carry out qualification of welding procedure at first as requested, remove during production and weld, the disappear technical indicator of hydrogen etc. of selection, weld preheating, interlayer temperature control, postwelding that also should strict control wlding in strict accordance with qualified qualification of welding procedure; Weldering front connector place is heated to more than 150 ℃, and the weld layer temperature is controlled at 150-250 ℃ during welding, and face bonding to groove depth three/two o'clock carry out the UT flaw detection, and the back root cleaning polishing is intact with the reverse side groove welding, has welded the front groove again; The hydrogen that disappears was handled 250 ℃ * 1 hour, and weld seam UT and RT detect;
9, heat treatment:
Adopt integral body to disappear and to handle, avoided the distortion that local heat treatmet causes and the inhomogeneities of material property; The heat treatment of welding longitudinal joint;
10, machining: once machine-shaping on 10 meters or above numerical control vertical lathe; Inside and outside circle goes out white back butt welded seam and carries out ultrasonic examination; Confirm the fine finishining direction by result of detection, carry out magnetic after the crotch fine finishining earlier and detect, for preventing distortion; Stand up less in the processing, cutting output is unsuitable excessive as far as possible.Finished size detects by figure, and emphasis detects circularity.
11, flaw detection, size detection etc.
Flaw detection requires: JB4730-2005, JB4726-2000
As shown in Figure 1, transition section of conical head of coke tower is the coupling part of coke drum bottom end socket and cylindrical shell, skirt, is the maximum position of STRESS VARIATION.Coke drum operation under 500 ℃ of left and right sides high temperature for a long time; Owing to fill the alternating action of burnt and decoking, make tower body constantly stand cold and hot fatigue, axial temperature difference causes local plastic deformation; Long-term use often causes the tower body bulging, and especially the lap-joint of skirt and conical head is prone to produce a large amount of crackles.So it is very high to the material requirements of bottom transition section of conical head product; Except that the IV level forging requirement of strictness by JB4726; Forging is done the hydrogen that disappears and is handled, and the normal temperature of forging requires to be more than 2 times of standard with low-temperature impact toughness, and the impurity content of forging, X coefficient etc. are all had the requirement of strictness.Maximum finished product external diameter is 9500mm, and about wall thickness 42mm, height is about 620mm (like Fig. 2).In order to improve the high and low temperature performance of coke drum between the operating period, avoid the lap joint of skirt and housing to crack, so adopt the unitary tapered end socket changeover portion of smithwelding.
Transition section of conical head of coke tower is formed by 3～5 sections forging weldings.Whole group is modified to the condition of heat treatment of blank before, the welding.
Institute's its meaning of the symbol of carrying is following in the above table:
| σ s: the yield strength of metal material (corresponding power when under the constant situation of active force, a large amount of plastic deformation taking place. |
| σ b: the tensile strength of metal material (disrumpent feelings pairing power takes place under tension sample) |
| δ 5: the percentage elongation of metal material |
| ψ: the contraction percentage of area of metal material |
| A KV: the impact flexibility of metal material (v-notch) |
| σ 0.2: (elongation of sample generation disproportional reaches 0.2% o'clock corresponding intensity of sample marking distance regulation to the yield strength of metal material, and this is for introducing the foreign standard of digestion.Generally than σ sLower,, adopt material this index to replace σ when having relatively high expectations to plastic deformation s) |
Claims (5)
1. method for manufacturing transition section of conical head of coke tower comprises and optimizes steel ingot, forging technology and hot and cold processing and forming technology, and it is characterized in that: said optimization steel ingot, forging technology may further comprise the steps:
1) refining steel ingot: select the high-quality steel scrap of low S, the low impurity of P for use, in electric furnace, smelt, again through ladle furnace refining, vacuum outgas, vacuum-casting;
2) forging moulding: with the refining steel ingot of substance about 15T, on the forging make-up machine more than the 4000T, dial longly through twice jumping-up, be forged into bar shaped again, forging ratio is more than or equal to 6;
3) forge after-baking: comprise positive tempering, even tissueization, dehydrogenation process; Temperature is controlled at 900-1000 ℃, and the samming time guarantees more than 3 hours, then cooling fast;
4) service check: whether sampling detection forging after-baking each item index meets standard at the forging stock two ends respectively;
Said hot and cold processing and forming technology comprises:
5) roughing, flaw detection: mill forging stock by the product and the required allowance that is shaped at gantry; Be processed into the strip slab; Surface roughness reaches
, carries out the UT flaw detection of two vertical direction then;
6) moulding: adopt the hydraulic press cold forming process, the monolateral process allowance of diametric(al) is in 20mm, and the monolateral process allowance of short transverse is in 15mm;
7) groove processing:
The thickness direction that on platform, draws, outer processing line and bevel for welding line, the per pass weld bond leaves amount of contraction, and processing bevel for welding, groove carry out MT and detect;
8) group to, the welding:
It is right to organize: with the fixing assembling of location-plate, making the joint fit-up gap is zero;
Welding: weldering front connector place is heated to more than 150 ℃, and the weld layer temperature is controlled at 150-250 ℃ during welding, and face bonding to groove depth three/two o'clock carry out the UT flaw detection, and the back root cleaning polishing is intact with the reverse side groove welding, has welded the front groove again; The hydrogen that disappears was handled 250 ℃ * 1 hour, and weld seam UT and RT detect;
9) heat treatment:
Adopt integral body to disappear and to handle, the heat treatment of welding longitudinal joint;
10) machining: once machine-shaping on 10 meters or above numerical control vertical lathe; Inside and outside circle goes out white back butt welded seam and carries out ultrasonic examination; Confirm the fine finishining direction by result of detection, carry out magnetic after the crotch fine finishining earlier and detect, for preventing distortion; Stand up less in the processing, cutting output is unsuitable excessive as far as possible;
11) flaw detection, size detection;
Flaw detection requires: JB4730-2005, JB4726-2000.
2. according to the method for manufacturing transition section of conical head of coke tower described in the claim 1; It is characterized in that: after the said refining steel ingot operation, the quality proportion of S is smaller or equal to 0.01% in the steel ingot, and the quality proportion of P is smaller or equal to 0.01%; The quality proportion of C is smaller or equal to 0.17%; The mass ratio of Si is great in 0.44% and less than 0.86%, and the mass ratio of Mn is great in 0.27% and less than 0.83%, and the mass ratio of Mo is great in 0.4% and less than 0.7%; The mass ratio of Cr is great in 0.94% and less than 1.56%, and H is smaller or equal to 2PPm.
3. according to the method for manufacturing transition section of conical head of coke tower described in the claim 2, it is characterized in that: the quality proportion sum of Mn and Si is smaller or equal to 1.2% in the said refining steel ingot.
4. according to the method for manufacturing transition section of conical head of coke tower described in the claim 3, it is characterized in that: said forging make-up machine is an oil pressure cold forming forging machine.
5. according to the method for manufacturing transition section of conical head of coke tower described in the claim 3, it is characterized in that: said forging make-up machine is a hydraulic pressure hot bending forging machine.
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102295949A (en) * | 2010-06-25 | 2011-12-28 | 中国石油化工集团公司 | Coking tower transition portion and processing and welding method |
| CN104648852A (en) * | 2015-02-09 | 2015-05-27 | 中国恩菲工程技术有限公司 | High-temperature material conveying tank |
| CN107127433B (en) * | 2017-05-26 | 2019-03-26 | 南京工业大学 | A kind of coke drum butt welding process |
| CN107584231A (en) * | 2017-10-23 | 2018-01-16 | 张化机（苏州）重装有限公司 | A kind of tower welding structure |
| CN108220543A (en) * | 2017-12-11 | 2018-06-29 | 无锡宏达重工股份有限公司 | A kind of manufacturing process of 14Cr1Mo steel flanges forging |
| CN112122521A (en) * | 2020-07-29 | 2020-12-25 | 伊莱特能源装备股份有限公司 | Method and system for manufacturing conical head transition section of coke tower |
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| CN1686666A (en) * | 2005-04-18 | 2005-10-26 | 宝钢集团上海五钢有限公司 | Production method of large high chromium steel cold roll blank |
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| CN1686666A (en) * | 2005-04-18 | 2005-10-26 | 宝钢集团上海五钢有限公司 | Production method of large high chromium steel cold roll blank |
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| 刘锡光.炼油厂延迟焦化装置焦炭塔制造技术改进.《压力容器》.2004,第21卷(第4期),29-32. * |
| 朱海兴.复合板锻焊过渡段焦炭塔制造.《压力容器》.2006,第23卷(第1期),23-28. * |
| 邬佳浩.焦炭塔下封头过渡段的组装与焊接.《石油工程建设》.2003,第29卷(第4期),19-22. * |
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