CN115740079A - Preparation method of seamless alloy pipe of petroleum refining cracking furnace - Google Patents
Preparation method of seamless alloy pipe of petroleum refining cracking furnace Download PDFInfo
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- CN115740079A CN115740079A CN202211181413.5A CN202211181413A CN115740079A CN 115740079 A CN115740079 A CN 115740079A CN 202211181413 A CN202211181413 A CN 202211181413A CN 115740079 A CN115740079 A CN 115740079A
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- 239000000956 alloy Substances 0.000 title claims abstract description 32
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 32
- 238000005336 cracking Methods 0.000 title claims abstract description 18
- 238000005504 petroleum refining Methods 0.000 title claims abstract description 17
- 238000002360 preparation method Methods 0.000 title claims abstract description 7
- 238000000034 method Methods 0.000 claims abstract description 31
- 238000005097 cold rolling Methods 0.000 claims abstract description 29
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 26
- 239000010959 steel Substances 0.000 claims abstract description 26
- 238000010438 heat treatment Methods 0.000 claims abstract description 18
- 238000003723 Smelting Methods 0.000 claims abstract description 14
- 239000002253 acid Substances 0.000 claims abstract description 12
- 230000008569 process Effects 0.000 claims abstract description 10
- 238000005406 washing Methods 0.000 claims abstract description 10
- 238000005520 cutting process Methods 0.000 claims abstract description 9
- 238000005242 forging Methods 0.000 claims abstract description 8
- 238000005498 polishing Methods 0.000 claims abstract description 8
- 238000005554 pickling Methods 0.000 claims abstract description 5
- 238000002791 soaking Methods 0.000 claims abstract description 4
- 238000004381 surface treatment Methods 0.000 claims abstract description 4
- 238000005482 strain hardening Methods 0.000 claims abstract description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 238000005238 degreasing Methods 0.000 claims description 9
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 5
- 229910017604 nitric acid Inorganic materials 0.000 claims description 5
- 239000006104 solid solution Substances 0.000 claims description 5
- 239000000243 solution Substances 0.000 claims description 5
- 230000007547 defect Effects 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 4
- 229910052717 sulfur Inorganic materials 0.000 claims description 4
- 238000005452 bending Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 238000012979 petrochemical cracking Methods 0.000 claims 1
- 238000007670 refining Methods 0.000 abstract description 5
- 239000000463 material Substances 0.000 description 6
- 239000000306 component Substances 0.000 description 4
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 3
- 239000005977 Ethylene Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000004321 preservation Methods 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 238000005120 petroleum cracking Methods 0.000 description 2
- 208000032544 Cicatrix Diseases 0.000 description 1
- VVTSZOCINPYFDP-UHFFFAOYSA-N [O].[Ar] Chemical compound [O].[Ar] VVTSZOCINPYFDP-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 231100000241 scar Toxicity 0.000 description 1
- 230000037387 scars Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Classifications
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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
Abstract
The invention provides a preparation method of a seamless alloy pipe of a petroleum refining cracking furnace, which comprises the following steps: s1, smelting: obtaining an alloy electroslag ingot by adopting an electric furnace, AOD and electroslag remelting smelting process; s2, forging the pipe blank: turning and polishing the alloy electroslag ingot after hot forging to obtain a tube blank; s3, hot perforation: sawing the tube blank, and performing hot piercing on the single round steel to obtain a pierced billet; s4, surface treatment: cutting two ends of a pierced billet into right angles, removing burrs, and removing oxide skins by acid washing; s5, cold rolling: cold working is carried out by adopting two times of cold rolling; s6, heat treatment: carrying out heating solution treatment after each cold rolling; s7, straightening and cutting: pre-straightening the steel pipe subjected to the two times of cold rolling and solution treatment, then integrally straightening by using a straightening machine, and sawing a pipe section to form a right angle; s8, acid washing: and (4) pickling, namely soaking and washing to enable the inner surface and the outer surface of the steel pipe to be silvery white or silvery gray. The method can prepare the seamless alloy pipe with the characteristics of coarse grain size of the structure, high-temperature endurance strength and the like, and can meet the reliability of the seamless alloy pipe used in a heating furnace of a refining device.
Description
[ technical field ] A
The invention relates to the technical field of metallurgy, in particular to a preparation method of a seamless alloy pipe of a petroleum refining cracking furnace.
[ background ] A method for producing a semiconductor device
In recent years, with the rapid development of petrochemical industry in China and the demand of national economic development, the capacity of refinery units in the petroleum industry is continuously increased, and the demand of ethylene cracking furnace tubes for refinery units in the petroleum industry is further increased. The ethylene cracking furnace tube is used as a core component, and the reliability of long-term operation in a refining device needs to be met.
Because of the special working condition requirements of the cracking furnace tube in the refining device, the device provides product technical indexes such as grain size, high-temperature endurance strength and the like for the furnace tube in the design. At present, the alloy seamless pipe has no reliable product technical parameters under the mature process guarantee in China, so that key parts of the device can only passively depend on import, and the development of the ethylene refining industry is restrained.
[ summary of the invention ]
The invention aims to solve the problems in the prior art and provides a method for preparing a seamless alloy tube of a petroleum refining cracking furnace, which can prepare the seamless alloy tube with the characteristics of coarse grain size of the structure, high-temperature endurance strength and the like and can meet the reliability of the seamless alloy tube used in a heating furnace of a refining device.
In order to realize the aim, the invention provides a preparation method of a seamless alloy pipe of a petroleum refining cracking furnace, which comprises the following steps:
s1, smelting: obtaining an alloy electroslag ingot by adopting an electric furnace, AOD and electroslag remelting smelting process;
s2, forging the pipe blank: turning and polishing the alloy electroslag ingot after hot forging to obtain a tube blank;
s3, hot perforation: sawing the tube blank, and performing hot piercing on the single round steel to obtain a pierced billet;
s4, surface treatment: cutting two ends of a pierced billet into right angles, removing burrs, and then carrying out acid pickling to remove oxide skins;
s5, cold rolling: cold working is carried out by adopting two times of cold rolling;
s6, heat treatment: carrying out heating and solid solution treatment after each cold rolling, wherein the solid solution heating temperature is 1150-1180 ℃, and the time period is 30-55min;
s7, straightening and cutting: pre-straightening the steel pipe subjected to the two times of cold rolling and solution treatment, then placing the steel pipe into a straightening machine, adjusting the stroke and the angle, straightening the whole steel pipe, and sawing the pipe section to form a right angle;
s8, acid washing: and (3) carrying out acid pickling treatment on the product by adopting hydrofluoric acid, nitric acid and water, and enabling the inner and outer surfaces of the steel pipe to be silvery white or silvery gray through soaking and washing.
Preferably, the smelting raw material consists of the following components: ni:30.5 to 32.5%, cr:20.5 to 22.5%, mn:0 to 1.5%, C:0.06 to 0.1%, cu:0 to 0.75%, si:0 to 1.0%, S:0 to 0.015%, al + Ti:0.9 to 1.1%, N: 80-115ppm, O: 5-10 ppm, and the balance of Fe and inevitable impurity elements.
Preferably, in the step S3, the hot perforation temperature is 1130-1150 ℃, the heat preservation time is 1.5-2h, and the hot perforation speed is 15-25r/min.
Preferably, in step S4, after the scale is removed, the inner and outer surfaces of the pierced billet are inspected, and the inner and outer surfaces are ground or polished to make the pierced billet surface free of defects.
Preferably, in step S5, the cold rolling speed is 30-40 times/min, the feeding amount is 8-10 mm/time, 194 x 14mm rolled pipes are obtained after the first cold rolling, the tolerance D +/-1mm and S +/-0.5mm are controlled, 168.3 x 7.111mm rolled pipes are obtained after the second cold rolling, the tolerance D +/-0.8mm, S < +is 1.2-0 mm.
Preferably, in step S5, the cold deformation elongation is controlled to 1.8.
Preferably, in step S6, before the heating solution treatment, the rolled pipe is immersed in a degreasing cylinder to degrease and then the inner and outer surfaces of the steel pipe are washed with pressurized water so that the surface of the steel pipe is free from oil stains and residual acid.
Preferably, in the step S6, the rolled tube is soaked in a degreasing cylinder for 40-50min for degreasing, and the liquid temperature is kept at 50-60 ℃.
Preferably, in step S7, the straightening of the whole is controlled within a straightness index of 1mm/m and a total length bending of 6 mm.
Preferably, in step S8, the product is acid-washed with 5% hydrofluoric acid +15% nitric acid + balance water.
The invention has the beneficial effects that:
1. the smelting adopts an electric furnace, AOD and electroslag remelting smelting process. The control indexes of all components of the material are designed, and the main component indexes of the physical product are as follows: ni:30.5 to 32.5%, cr:20.5 to 22.5%, mn:0 to 1.5%, C:0.06 to 0.1%, cu:0 to 0.75%, si:0 to 1.0%, S:0 to 0.015%, al + Ti:0.9 to 1.1%, N: 80-115ppm, O: 5-10ppm, fe: the balance; non-metallic inclusions: A. b, C, D and Ds are respectively less than or equal to 1.0. Through the control of the index content and the process technology, a foundation is laid for satisfying the comprehensive performance of the furnace tube product in the raw material organization.
2. Obtaining a pierced billet through a hot piercing process, and controlling the heating temperature of 1130-1150 ℃, the heat preservation time of 1.5-2h and the hot piercing speed of 15-25r/min to ensure that the pierced billet has quality effects on the size, the inner surface and the outer surface and the separation layer.
3. Through the design of cold deformation size, the cold deformation elongation rate is determined to reach 1.8, the structure crystal grains are fully deformed again, the matched cold rolling equipment model is determined, and the specification of the target product is guaranteed.
4. The heat treatment temperature is regulated to 1150-1180 ℃, the heat preservation period is 30-55min, and water is sprayed and cooled. The mechanical property index of the product at the room temperature state meets Rm more than or equal to 450MPa, rp0.2 more than or equal to 170MPa, A more than or equal to 30 percent; the mechanical property Rm is more than or equal to 432MPa at the temperature of 525 ℃, and Rp0.2 is more than or equal to 108MPa. The texture grain size is G2-5 grade.
The features and advantages of the present invention will be described in detail by way of examples.
[ detailed description ] embodiments
A preparation method of a seamless alloy pipe of a petroleum refining and cracking furnace discloses a process for manufacturing the seamless alloy pipe of the petroleum refining and cracking furnace by a smelting-hot perforation-cold processing-heat treatment process route, which comprises the following steps:
s1, smelting: an alloy electroslag ingot is obtained by adopting an electric furnace, AOD (argon oxygen decarburization) and electroslag remelting smelting process, and smelting raw materials comprise the following components: ni:30.5 to 32.5%, cr:20.5 to 22.5%, mn:0 to 1.5%, C:0.06 to 0.1%, cu:0 to 0.75%, si:0 to 1.0%, S:0 to 0.015%, al + Ti:0.9 to 1.1%, N: 80-115ppm, O: 5-10 ppm, and the balance of Fe and inevitable impurity elements. The material structure inclusion is controlled by electroslag smelting and gas element control, the high-temperature strength of the material is improved by C element control, the high-temperature oxidation resistance of the material is improved by alloy element Cr, ni and the like control, and the heat strength performance of the material is improved by Al and Ti control.
S2, forging the pipe blank: and (3) polishing the alloy electroslag ingot after hot forging to a diameter of 235mm to obtain a tube blank, wherein the surface of the material in the polishing state has no defects of cracks, folding, scars, impurities and the like.
S3, hot perforation: sawing the tube blank, cutting off the round steel according to the weight of a single round steel of 360-365Kg, and performing hot piercing on the single round steel to obtain a pierced billet; the hot perforating temperature is 1130-1150 ℃, the temperature is kept for 1.5-2h, the hot perforating speed is 15-25r/min, the pierced billet is cooled in a water immersion tank after perforation, the size of the pierced billet is controlled to be 235 x 21mm, and then the size and the inner and outer surfaces can be inspected (can be polished properly).
S4, surface treatment: cutting two ends of the pierced billet into right angles, removing burrs, then removing oxide skin by acid washing, inspecting the inner and outer surfaces of the pierced billet, and grinding or polishing the inner and outer surfaces to ensure that the surface of the pierced billet is free of defects (if the wall thickness deviation is uneven, targeted grinding and deviation correction should be performed).
S5, cold rolling: in the embodiment, cold rolling is finished in G280-G350 and G180 devices, cold rolling is carried out by adopting two-pass cold rolling, the cold rolling speed is 30-40 times/min (preferably 35 times/min), and the feeding amount is 8-10 mm/time; in this example, the first cold rolling pass rolled the tube blank of phi 235 x 21mm gauge to 194 x 14mm rolled tube and controlled tolerance D +/-1mm, S +/-0.5mm, the second cold rolling pass rolled the tube blank of 194 x 14mm to 168.3 x 7.111mm rolled tube and controlled tolerance D +/-0.8mm, S +1.2, -0mm. And (4) detecting a first workpiece in the rolling process, and checking the dimensional tolerance and the quality of the inner surface and the outer surface in the middle.
S6, heat treatment: after each cold rolling, the rolled pipe is immersed into a degreasing cylinder for degreasing, the liquid temperature is kept at 50-60 ℃, the rolled pipe is immersed for 45min, the inner surface and the outer surface of the steel pipe are washed by pressure water, so that the surface of the steel pipe has no oil stain and residual acid, then the rolled pipe after each cold rolling is heated and subjected to solid solution treatment respectively, the temperature is 1150-1180 ℃, and the time period is 30-55min; in this example, a natural gas continuous heat treatment furnace was used. And samples were taken after the heat treatment, and room temperature mechanical properties, hardness, and grain size were measured.
S7, straightening and cutting: pre-straightening the steel pipe subjected to the two times of cold rolling and solution treatment to ensure that the whole steel pipe is not bent greatly, then, putting the steel pipe into a straightening machine, adjusting the stroke and the angle, then, integrally straightening, controlling the straightness index to be 1mm/m and the bending degree to be within 6mm on the total length, and then, sawing a pipe section to form a right angle;
s8, acid washing: the product is acid-washed by adopting the mixture ratio of 5 percent hydrofluoric acid, 15 percent nitric acid and the balance water, and the inner and outer surfaces of the steel pipe are silvery white or silvery gray through soaking and washing.
The above embodiments are illustrative of the present invention, and are not intended to limit the present invention, and any simple modifications of the present invention are within the scope of the present invention.
Claims (10)
1. A preparation method of a seamless alloy pipe of a petroleum refining cracking furnace is characterized by comprising the following steps: the method comprises the following steps:
s1, smelting: obtaining an alloy electroslag ingot by adopting an electric furnace, AOD and electroslag remelting smelting process;
s2, forging the pipe blank: turning and polishing the alloy electroslag ingot after hot forging to obtain a tube blank;
s3, hot perforation: sawing the tube blank, and performing hot piercing on the single round steel to obtain a pierced billet;
s4, surface treatment: cutting two ends of a pierced billet into right angles, removing burrs, and then carrying out acid pickling to remove oxide skins;
s5, cold rolling: cold working is carried out by adopting two times of cold rolling;
s6, heat treatment: carrying out heating and solid solution treatment after each cold rolling, wherein the solid solution heating temperature is 1150-1180 ℃, and the time period is 30-55min;
s7, straightening and cutting: pre-straightening the steel pipe subjected to the two times of cold rolling and solution treatment, then placing the steel pipe into a straightening machine, adjusting the stroke and the angle, straightening the whole steel pipe, and sawing the pipe section to form a right angle;
s8, acid washing: and (3) pickling the product by adopting hydrofluoric acid, nitric acid and water, and soaking and washing to enable the inner and outer surfaces of the steel pipe to be silvery white or silvery gray.
2. The method for preparing the seamless alloy tube for the petroleum refining cracking furnace as claimed in claim 1, wherein the method comprises the following steps: the smelting raw materials consist of the following components: ni:30.5 to 32.5%, cr:20.5 to 22.5%, mn:0 to 1.5%, C:0.06 to 0.1%, cu:0 to 0.75%, si:0 to 1.0%, S:0 to 0.015%, al + Ti:0.9 to 1.1%, N: 80-115ppm, O: 5-10 ppm, and the balance of Fe and inevitable impurity elements.
3. The method for preparing the seamless alloy tube for the petroleum refining cracking furnace as claimed in claim 1, wherein the method comprises the following steps: in the step S3, the temperature of hot perforation is 1130-1150 ℃, the temperature is kept for 1.5-2h, and the hot perforation speed is 15-25r/min.
4. The method for preparing the seamless alloy tube for the petroleum refining cracking furnace as claimed in claim 1, wherein the method comprises the following steps: and S4, after removing the oxide skin, checking the inner surface and the outer surface of the pierced billet, and polishing or polishing the inner surface and the outer surface to ensure that the surface of the pierced billet is free of defects.
5. The method for preparing the seamless alloy tube for the petroleum refining cracking furnace as claimed in claim 1, wherein the method comprises the following steps: in step S5, the cold rolling speed is 30-40 times/min, the feeding amount is 8-10 mm/time, 194 x 14mm rolled tubes are obtained after the first cold rolling, the tolerance D +/-1mm and S +/-0.5mm are controlled, 168.3 x 7.11mm rolled tubes are obtained after the second cold rolling, the tolerance D +/-0.8mm and S +/-1.2-0 mm are controlled.
6. The method for preparing the seamless alloy tube of the petroleum refining cracking furnace according to claim 1, wherein the method comprises the following steps: in step S5, the cold deformation elongation is controlled to 1.8.
7. The method for preparing the seamless alloy tube of the petroleum refining cracking furnace according to claim 1, wherein the method comprises the following steps: in step S6, before heating and solution treatment, the rolled pipe is immersed into a degreasing cylinder for degreasing, and then the inner surface and the outer surface of the steel pipe are washed by pressure water, so that the surface of the steel pipe has no oil stain and residual acid.
8. The method for preparing the seamless alloy tube for the petrochemical cracking furnace according to claim 7, wherein the method comprises the following steps: in step S6, the rolled tube is soaked in a degreasing cylinder for 40-50min for degreasing, and the liquid temperature is kept at 50-60 ℃.
9. The method for preparing the seamless alloy tube of the petroleum refining cracking furnace according to claim 1, wherein the method comprises the following steps: in the step S7, the straightness index is controlled to be 1mm/m through integral straightening, and the bending degree on the total length is within 6 mm.
10. The method for preparing the seamless alloy tube for the petroleum refining cracking furnace as claimed in claim 1, wherein the method comprises the following steps: in step S8, the product is acid-washed by 5% hydrofluoric acid, 15% nitric acid and the balance water.
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| CN202211181413.5A CN115740079A (en) | 2022-09-27 | 2022-09-27 | Preparation method of seamless alloy pipe of petroleum refining cracking furnace |
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| CN202211181413.5A CN115740079A (en) | 2022-09-27 | 2022-09-27 | Preparation method of seamless alloy pipe of petroleum refining cracking furnace |
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2022
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