CN114029439A - Method for processing ultra-long and ultra-high pressure steel pipe - Google Patents
Method for processing ultra-long and ultra-high pressure steel pipe Download PDFInfo
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- CN114029439A CN114029439A CN202111283305.4A CN202111283305A CN114029439A CN 114029439 A CN114029439 A CN 114029439A CN 202111283305 A CN202111283305 A CN 202111283305A CN 114029439 A CN114029439 A CN 114029439A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 81
- 239000010959 steel Substances 0.000 title claims abstract description 81
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000005242 forging Methods 0.000 claims abstract description 70
- 238000004519 manufacturing process Methods 0.000 claims abstract description 20
- 238000005520 cutting process Methods 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims description 18
- 238000003672 processing method Methods 0.000 claims description 3
- 239000004698 Polyethylene Substances 0.000 abstract description 6
- -1 polyethylene Polymers 0.000 abstract description 6
- 229920000573 polyethylene Polymers 0.000 abstract description 6
- 238000003754 machining Methods 0.000 abstract description 4
- 239000003245 coal Substances 0.000 abstract description 3
- 239000003208 petroleum Substances 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 3
- 230000008676 import Effects 0.000 abstract description 2
- 239000002184 metal Substances 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 230000035515 penetration Effects 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J7/00—Hammers; Forging machines with hammers or die jaws acting by impact
- B21J7/02—Special design or construction
- B21J7/14—Forging machines working with several hammers
- B21J7/16—Forging machines working with several hammers in rotary arrangements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/14—Making machine elements fittings
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- Engineering & Computer Science (AREA)
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Abstract
The invention discloses a method for processing an ultra-long and ultra-high pressure steel pipe, belonging to the field of manufacturing of high pressure polyethylene tubular reactors. In the method, an RF-70 precision forging machine is adopted to rotate in a radial direction to forge steel ingots to open blanks, the precision forging machine is provided with four hammers which are provided with R-shaped anvils to be pulled out for length, the heated steel ingots are forged into round blanks with multiple sizes, and then hot cutting is carried out by a hot cutting machine to prepare single-size round blanks; after the round billet is heated and insulated, an RF-70 precision forging machine is adopted to carry out radial rotation precision forging, the precision forging machine is provided with special four hammers, the special R-shaped anvils are arranged on the four hammers simultaneously to carry out drawing length, small-pass large deformation is adopted during initial forging, small-pass small deformation is adopted during final forging, and the ultrahigh-pressure steel pipe billet is forged by one fire. The method can reduce the machining allowance, improve the material utilization rate and the production efficiency, and meet the requirement of the grain size of the ultrahigh-pressure steel pipe. The invention can effectively ensure the product quality, can replace import, simultaneously reduce the price of the steel pipe, shorten the supply period and meet the requirement of the domestic petroleum and coal chemical industry on the ultra-long and ultra-high pressure steel pipe.
Description
Technical Field
The invention relates to a processing method of an ultra-long and ultra-high pressure steel pipe, belonging to the field of manufacturing of high pressure polyethylene tubular reactors.
Background
The ultrahigh pressure steel pipe is a core component of a tubular reactor in a petrochemical high pressure polyethylene production device, and at present, the working pressure of the ultrahigh pressure steel pipe is 100 MPa-350 MPa, the working temperature is 200-350 ℃, the inner diameter specification phi is 30 mm-80 mm, the outer diameter phi is 76 mm-203 mm, and the length is 8000 mm-15000 mm.
With the development of petroleum and coal chemical industry technology, domestic high-pressure polyethylene devices are rapidly developed, and at present, the lengths of ultra-high-pressure steel pipes of the high-pressure polyethylene devices under construction or built are 15 meters or more. The increase of the length of the steel pipe and the improvement of the quality requirement can improve the operation reliability of the device, but the production difficulty of the ultra-high pressure steel pipe with the length of 15 meters or more is larger, the steel pipe with the specification only has the production capacity at home at present, but the ultra-high pressure steel pipe produced at home is high in price, particularly, the supply period is long, the construction period of a high pressure polyethylene project is seriously influenced, and a plurality of projects built at home face the difficulty.
The traditional free forging method is adopted to produce the ultrahigh pressure steel pipe in China, but the free forging process technology has the defects of difficult forming by one-time forging, low forging speed, low production efficiency and large machining allowance, and the free forging can hardly realize blank forging along with the increase of the length of the steel pipe, and the grain size of the ultrahigh pressure steel pipe produced by free forging can hardly meet the requirement, so the development and application of the ultra-long ultrahigh pressure steel pipe are seriously influenced.
Disclosure of Invention
The invention aims to provide a method for processing ultra-long and ultra-high pressure steel pipes, which comprises a method for processing ultra-high pressure steel pipes with the length of 15 meters or more, solves the problem that the grain size of the ultra-high pressure steel pipes is difficult to meet the requirement, can reduce the processing allowance, improve the material utilization rate, improve the production efficiency, reduce the product cost, and fills the domestic blank of processing ultra-long and ultra-high pressure steel pipes. The invention can effectively ensure the product quality, can replace import, simultaneously reduce the price of the steel pipe, shorten the supply period and meet the requirement of the domestic petroleum and coal chemical industry on the ultra-long and ultra-high pressure steel pipe.
The technical scheme is as follows:
the processing method of the ultra-long and ultra-high pressure steel pipe comprises the following steps: 1) heating a steel ingot for manufacturing an ultrahigh-pressure steel pipe; 2) adopting an RF-70 precision forging machine to rotate in the radial direction to forge steel ingots to open blanks, installing special four hammers on the precision forging machine, installing R-shaped anvils on the four hammers to draw out lengths, forging the heated steel ingots into round blanks with multiple sizes, and then adopting a hot cutting machine to perform hot cutting to obtain single-size round blanks 3) heating the hot round blanks; 4) and (3) adopting an RF-70 precision forging machine, installing special four hammers, simultaneously installing R-shaped anvil for drawing, adopting small-pass large deformation during initial forging, adopting multi-pass small deformation during final forging, and forging the steel pipe into the ultrahigh-pressure steel pipe by one fire.
Further, heating the steel ingot for manufacturing the ultrahigh pressure steel pipe at 1090-1130 ℃ and keeping the temperature for 2-6 h.
Furthermore, the four hammers are provided with R-shaped anvils for drawing, the ratio of the relative feeding amount to the diameter of the R-shaped anvils after drawing is more than or equal to 0.5-0.7, and the final forging temperature is controlled to be more than or equal to 850 ℃;
further, heating the single multiple length round blank at 1090-1130 ℃ and keeping the temperature for 2-4 h;
furthermore, the four hammers are simultaneously installed with an R-shaped anvil for drawing, and the ratio of the relative feeding amount to the diameter of the drawn hammer is more than or equal to 0.5-0.7; the final forging temperature is controlled at 750-900 ℃.
Further, the method comprises the following steps:
1) heating a steel ingot: heating the steel ingot for manufacturing the ultrahigh pressure steel pipe at 1090-1130 ℃ and preserving the heat for 2-6 h.
2) Cogging by a precision forging machine: an RF-70 precision forging machine is adopted, a special four-hammer head is installed, the four-hammer head is simultaneously installed with an R-shaped anvil for drawing, the ratio of the relative feeding amount to the diameter of the drawn part is more than or equal to 0.5-0.7, the four-direction R-shaped anvil is combined with a flat anvil and a V-shaped anvil, the core metal is more favorably in a three-dimensional compressive stress state, the forging permeability is improved, the finish forging temperature is controlled to be more than or equal to 850 ℃, the heated electroslag ingot is subjected to radial rotary precision forging cogging, forged into a round billet with double-ruler diameter, and a hot cutting machine is adopted to perform hot cutting into a single-double-ruler blank;
3) heating the blank: heating the hot round blank at 1090-1130 ℃ for 2-4 h;
4) and (3) precision forging: adopting an RF-70 precision forging machine, installing special four hammers, simultaneously installing R-shaped anvil for drawing, wherein the ratio of the relative feeding amount to the drawn diameter is more than or equal to 0.5-0.7; the initial forging temperature is controlled to be 1090-1130 ℃, so that welding of internal defects is facilitated, cracks on the surface of a forged piece are reduced, small-pass large deformation is adopted, the forging permeability is improved, the final forging temperature is controlled to be 750-900 ℃, the original grain size is small, the forging production efficiency is guaranteed, and the ultrahigh-pressure steel pipe is forged by multiple-pass small deformation and one-time fire forging; the obtained steel pipe has the advantages of no more than 5mm of full-length straightness, good surface quality and high dimensional precision (+/-2 mm).
The diameter phi of the obtained tube blank is 76 mm-203 mm, the length is more than 15000mm, the surface quality of the steel tube is good, the dimensional precision is high (+/-2 mm), and the whole length of the straightness of the axis of the steel tube is not more than 5 mm.
The invention adopts the four-way R-shaped anvil, which is more beneficial to the central metal in a three-way compressive stress state, improves the forging penetration, has uniform deformation and more compact structure, meets the requirement of the grain size of the ultrahigh pressure steel pipe, simultaneously reduces the blank machining allowance, improves the material utilization rate, improves the production efficiency and reduces the product cost, and compared with the traditional free forging, the radial rotary precision forging improves the material utilization rate by about 10 percent by taking the CGYG-60 JCH-60X 105X 16000 ultrahigh pressure steel pipe as an example.
Drawings
FIG. 1 is a radial rotary precision forging blank drawing of a 60JCH ultrahigh pressure steel pipe;
FIG. 2 is a drawing of a 60JCH ultrahigh pressure steel pipe free forging blank;
FIG. 3 is a radial rotary precision forging grain size diagram of a 60JCH ultrahigh pressure steel pipe.
Detailed Description
One of the embodiments
Selecting the specification of the finished product of the ultrahigh-pressure steel pipe: the internal diameter is 60mm, the external diameter is 105.2mm, the length is 16000mm, and the ultrahigh pressure steel pipe material is 35CrNi3 MoV. When the radial forging is carried out by adopting an RF-70 precision forging machine according to the attached figure 1, the ultrahigh pressure steel pipe blank is radially and rotationally forged in the size specification: the method for manufacturing the ultra-thin and ultra-long high-pressure steel pipe with the diameter phi of 160mm and the length of 16600mm comprises the following steps:
1) and (4) heating the steel ingot. Heating the steel ingot for manufacturing the ultrahigh pressure steel pipe at 1100 +/-10 ℃, and keeping the temperature for 4.5 hours;
2) cogging by a precision forging machine: an RF-70 precision forging machine is adopted, a special four-hammer head is installed, the four-hammer head is simultaneously provided with an R280 type anvil for drawing, the ratio of the relative feeding amount to the diameter after drawing is selected to be 0.7, a four-way R type anvil is combined with a flat anvil and a V type anvil, the core metal is more favorably in a three-way compressive stress state, the forging permeability is improved, the finish forging temperature is controlled to be more than or equal to 850 ℃, the heated electroslag ingot is subjected to radial rotary precision forging cogging, the electroslag ingot is forged into a round billet with the diameter phi of 400 times, and a hot cutting machine is adopted for hot cutting into a single-time blank;
3) heating the blank: heating the hot round blank at 1090-1110 ℃ for 2.5 h;
4) and (3) precision forging: adopting an RF-70 precision forging machine, installing special four hammers which are simultaneously provided with R100 or R140 type anvil for drawing, wherein the ratio of the relative feeding amount to the diameter of the drawn part is 0.6; the initial forging temperature is controlled to be 1090-1100 ℃, so that welding of internal defects is facilitated, cracks on the surface of a forged piece are reduced, few-pass large deformation is adopted, the forging penetration is improved, the final forging temperature is controlled to be 780-900 ℃, the original grain size is small, the forging production efficiency is guaranteed, multiple-pass small deformation is adopted, an ultrahigh-pressure steel pipe with the diameter phi of 160mm and the length of more than or equal to 16600mm is forged by one fire, the full-length straightness of the steel pipe is not more than 5mm, the surface quality is good, and the size precision is high (+/-2 mm).
The invention adopts the four-way R-shaped anvil, so that the center metal is more favorable to be in a three-way compressive stress state, the forging penetration is improved, the deformation is uniform, the structure is more compact, the requirement of the grain size of the ultrahigh pressure steel pipe is met, and meanwhile, the blank machining allowance is smaller, the material utilization rate is improved, the production efficiency is improved, and the product cost is reduced. Taking CGYG-60JCH-60 × 105 × 16000 ultra-high pressure steel tube as an example, the radial rotary finish forging improves the material utilization rate by about 10% compared with the conventional free forging, and the conventional free forging specification and size are shown in fig. 2.
Claims (10)
1. The processing method of the ultra-long and ultra-high pressure steel pipe is characterized in that,
the method comprises the following steps: 1) heating a steel ingot for manufacturing an ultrahigh-pressure steel pipe; 2) adopting an RF70 precision forging machine to radially and rotatably forge steel ingots to perform cogging, installing four hammers on the precision forging machine, installing R-shaped anvils on the four hammers to perform drawing, forging the heated steel ingots into round billets with multiple sizes, and then adopting a hot cutting machine to perform hot cutting to prepare single-size round billets 3) and heating the hot round billets; 4) and (3) adopting an RF70 precision forging machine, installing four hammers, simultaneously installing R-shaped anvil for drawing, adopting small-pass large deformation during initial forging, adopting multi-pass small deformation during final forging, and forging the steel pipe into the ultrahigh-pressure steel pipe by one fire.
2. The method for processing the ultra-long and ultra-high pressure steel pipe according to claim 1, wherein the step 4): simultaneously arranging R100 or R140 type anvils for drawing four hammers, wherein the ratio of the relative feeding amount to the drawn diameter is 0.6; the initial forging temperature is controlled to be 1090-1100 ℃, and less passes and large deformation are adopted; the final forging temperature is controlled to be 780-900 ℃, and multi-pass small deformation is adopted.
3. The method for processing the ultra-long and ultra-high pressure steel pipe according to claim 1, wherein the step 1): heating the steel ingot for manufacturing the ultrahigh pressure steel pipe at 1090-1130 ℃ and preserving the heat for 2-6 h.
4. The method for processing the ultra-long and ultra-high pressure steel pipe according to claim 1, wherein the step 2): the four hammers are provided with R-shaped anvils for drawing and long, the ratio of the relative feeding amount to the diameter of the drawn anvils is more than or equal to 0.5-0.7, and the final forging temperature is controlled to be more than or equal to 850 ℃.
5. The method for processing the ultra-long and ultra-high pressure steel pipe according to claim 1, wherein the step 3): heating the single multiple length round blank at 1090-1130 deg.c for 2-4 hr.
6. The method for processing the ultra-long and ultra-high pressure steel pipe according to claim 1, wherein the step 4): simultaneously arranging four hammers with R-shaped anvils for drawing, wherein the ratio of relative feeding amount to the diameter of the drawn anvils is more than or equal to 0.5-0.7, and controlling the initial forging temperature to be 1090-1130 ℃; the final forging temperature is controlled at 750-900 ℃.
7. The method of processing an ultra-long and ultra-high pressure steel pipe according to claim 1, wherein the steel ingot for manufacturing the ultra-high pressure steel pipe is heated at 1100 ℃ ± 10 ℃ and is kept warm for 4.5 hours.
8. The method for processing the ultra-long and ultra-high pressure steel pipe according to claim 1, wherein the step 2): the four hammers are simultaneously installed with an R280 type anvil for drawing, and the ratio of the relative feeding amount to the ratio of the drawn length is selected to be 0.7.
9. The method for processing the ultra-long and ultra-high pressure steel pipe according to claim 1, wherein the step 3): heating the blank: the heating temperature is 1090-1110 ℃, and the temperature is kept for 2.5 h.
10. The method for processing the ultra-long and ultra-high pressure steel pipe according to claim 1, wherein the specifications of the finished ultra-high pressure steel pipe are selected as follows: the internal diameter is 60mm, the external diameter is 105.2mm, the length is 16000mm, and the ultrahigh pressure steel pipe material is 35CrNi3 MoV.
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| CN202111283305.4A CN114029439A (en) | 2021-11-01 | 2021-11-01 | Method for processing ultra-long and ultra-high pressure steel pipe |
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| CN202111283305.4A CN114029439A (en) | 2021-11-01 | 2021-11-01 | Method for processing ultra-long and ultra-high pressure steel pipe |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114178450A (en) * | 2021-11-23 | 2022-03-15 | 内蒙古北方重工业集团有限公司 | Method for processing ultra-thin and ultra-high pressure steel pipe blank |
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| CN113172189A (en) * | 2021-04-09 | 2021-07-27 | 河南中原特钢装备制造有限公司 | Forging method for refining grain size of long-rod steel forging |
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2021
- 2021-11-01 CN CN202111283305.4A patent/CN114029439A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| SU1620195A1 (en) * | 1988-05-31 | 1991-01-15 | Московский институт стали и сплавов | Method of forging and broaching |
| US20020017123A1 (en) * | 2000-06-23 | 2002-02-14 | Rupert Wieser | Method for forging a metallic workpiece |
| RU2004133439A (en) * | 2004-11-16 | 2006-05-10 | Открытое акционерное общество "Т жпрессмаш" (RU) | METHOD FOR FORGING BILLETS IN FOUR-BASKET FORGING DEVICE |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114178450A (en) * | 2021-11-23 | 2022-03-15 | 内蒙古北方重工业集团有限公司 | Method for processing ultra-thin and ultra-high pressure steel pipe blank |
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