CN115415324A - Manufacturing method of high-carbon high-chromium bearing steel pipe - Google Patents
Manufacturing method of high-carbon high-chromium bearing steel pipe Download PDFInfo
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- CN115415324A CN115415324A CN202211015201.XA CN202211015201A CN115415324A CN 115415324 A CN115415324 A CN 115415324A CN 202211015201 A CN202211015201 A CN 202211015201A CN 115415324 A CN115415324 A CN 115415324A
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- steel pipe
- bearing steel
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- round billet
- chromium bearing
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 64
- 239000010959 steel Substances 0.000 title claims abstract description 64
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 40
- 239000011651 chromium Substances 0.000 title claims abstract description 33
- 229910052804 chromium Inorganic materials 0.000 title claims abstract description 32
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 30
- 238000010438 heat treatment Methods 0.000 claims abstract description 32
- 239000000463 material Substances 0.000 claims abstract description 13
- 238000007689 inspection Methods 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims description 19
- 238000010583 slow cooling Methods 0.000 claims description 15
- 229910052750 molybdenum Inorganic materials 0.000 claims description 8
- 239000000446 fuel Substances 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 229910052748 manganese Inorganic materials 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 229910052717 sulfur Inorganic materials 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 abstract description 4
- 239000002184 metal Substances 0.000 abstract description 4
- 238000005520 cutting process Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 3
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 6
- 239000011733 molybdenum Substances 0.000 description 6
- 238000004080 punching Methods 0.000 description 4
- 238000005096 rolling process Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000010485 coping Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000013072 incoming material Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 229910001105 martensitic stainless steel Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B19/00—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
- B21B19/02—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling ; Diescher mills, Stiefel disc piercers or Stiefel rotary piercers
- B21B19/04—Rolling basic material of solid, i.e. non-hollow, structure; Piercing, e.g. rotary piercing mills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/004—Heating the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Heat Treatment Of Steel (AREA)
- Forging (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a manufacturing method of a high-carbon high-chromium bearing steel pipe, which comprises the steps of carrying out quality inspection on a feeding round billet; forming a centering hole in the center of the end part of the round billet subjected to the material cutting treatment; heating the round billet with the centering hole by a specific heating system; perforating the heated round billet by using the preheated top; the technology realizes the technical breakthrough of producing high-strength and high-hardness bearing steel pipes in batches in a hot perforation mode, improves the yield of metal, improves the yield by 2/3 compared with the original manufacturing process, greatly reduces the manufacturing cost of the bearing steel pipes and has wide application prospect.
Description
Technical Field
The invention relates to the technical field of steel processing, in particular to a manufacturing method of a high-carbon high-chromium bearing steel pipe.
Background
The existing manufacturing process of the high-carbon high-chromium 9Cr18Mo bearing steel pipe mostly adopts a boring mode of directly machining a round billet, but the steel has high strength and hardness, strong wear resistance, difficult deformation, large deformation resistance and large required rolling force, so the metal loss in the production process is large, the yield is low and the cost is high. However, the steel pipe has the characteristics of good corrosion resistance, wear resistance and the like, so that the steel pipe can still be applied for a long time in the marine environment and under certain strong acidic and high-salt use working conditions, and therefore, the application range is wide, and the customer demand is high.
In view of this, it is necessary to provide an improved process for mass production of high-carbon and high-chromium bearing steel pipes.
Disclosure of Invention
The invention aims to provide a manufacturing process for producing high-carbon and high-chromium bearing steel pipes in batch through the flows of round billet size and surface quality inspection grinding (material breaking) → cold centering → heating → perforation → slow cooling → pipe blank size and surface quality inspection → packaging → warehousing, and the technical breakthrough of manufacturing high-strength and high-hardness bearing steel pipes in a hot perforation manner is realized, the yield of the steel pipes manufactured by the method is up to 92 percent, the manufacturing cost of the bearing steel pipes is greatly reduced, the customer satisfaction is high, and the application prospect is wide.
In order to achieve the purpose, the invention provides the following technical scheme:
a method of manufacturing a high-carbon high-chromium bearing steel pipe, the method comprising:
carrying out quality inspection on the feeding round billet;
a centering hole is formed in the center of the end part of the round billet after the material breaking treatment;
heating the round billet with the centering hole by a specific heating system;
perforating the heated round billet by using the preheated top;
and (4) immediately carrying out slow cooling treatment on the perforated steel pipe so as to prepare the high-carbon high-chromium bearing steel pipe.
As a further improvement of the present invention, the specific heating schedule is: the temperature is raised to 700 +/-10 ℃ in stages, the temperature is kept for 60min, and then the temperature is raised to 1160 +/-10 ℃ in stages, and the temperature is kept for 100min.
As a further improvement of the present invention, the specific heating schedule is: heating to 700 + -10 deg.C for 60min at average speed of 7 deg.C/min, heating to 1160 + -10 deg.C for 100min at average speed of 9 deg.C/min for 50 min.
As a further improvement of the present invention, the piercing the heated round billet with the preheated plug comprises:
and controlling the temperature of the round billet before perforation to be 1120-1150 ℃.
As a further improvement of the present invention, the piercing the heated round billet by using the preheated plug comprises:
the preheating temperature of the plug is 850-950 ℃; and the perforation rotating speed is controlled to be 60-70 r/min.
As a further improvement of the invention, the slow cooling time is more than or equal to 8h, and the temperature of the steel pipe is less than or equal to 150 ℃, and the slow cooling is finished.
As a further improvement of the invention, the heating of the round billet with the centering hole by a specific heating schedule comprises the following steps:
and adjusting the air-fuel ratio in the heating furnace to keep the weak reducing atmosphere in the furnace and keep the micro-positive pressure in the furnace.
As a further improvement of the invention, the high-carbon high-chromium bearing steel pipe comprises the following chemical components in percentage by weight:
C：0.95-1.10％,Si≤0.80％,Mn≤0.80％,P≤0.040％,S≤0.030％,Ni≤0.60％,Cr：16.00～18.00％,Mo：0.40-0.70％。
as a further improvement of the invention, the specification of the steel pipe is phi 107mm multiplied by 21mm multiplied by 2.8-2.9 m.
As a further improvement of the invention, the parameters of the steel pipe during the perforation are set as follows: roller spacing: 90 +/-1 mm; guide plate spacing: 97 +/-1 mm; the top extension amount: 92 +/-2 mm; the diameter of the plug: 60mm.
The invention has the technical effects and advantages that:
according to the manufacturing method of the high-carbon high-chromium bearing steel pipe, the quality of the fed round billet is checked; a centering hole is formed in the center of the end part of the round billet after the material breaking treatment; heating the round billet with the centering hole by a specific heating system; perforating the heated round billet by using the preheated top; the technology realizes the technical breakthrough of producing high-strength and high-hardness bearing steel pipes in batches in a hot perforation mode, improves the yield of metal, improves the yield by 2/3 compared with the original manufacturing process, greatly reduces the manufacturing cost of the bearing steel pipes and has wide application prospect.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
FIG. 1 is a flow chart of a method for manufacturing a high-carbon high-chromium bearing steel pipe according to the present invention;
FIG. 2 is a schematic view showing the trend of the round billet heating system of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to solve the defects of the prior art, the invention discloses a method for manufacturing a high-carbon high-chromium bearing steel pipe by adopting martensitic stainless steel 9Cr18Mo (the chemical composition by weight percent is 0.95-1.10% of C, less than or equal to 0.80% of Si, less than or equal to 0.80% of Mn, less than or equal to 0.040% of P, less than or equal to 0.030% of S, less than or equal to 0.60% of Ni, 16.00-18.00% of Cr and 0.40-0.70% of Mo), and as shown in figure 1, the method mainly comprises the following steps: carrying out quality inspection on the feeding round billet; a centering hole is formed in the center of the end part of the round billet after the material breaking treatment; heating the round billet with the centering hole by a specific heating system; perforating the heated round billet by using the preheated top; and (4) immediately carrying out slow cooling treatment on the perforated steel pipe so as to prepare the high-carbon high-chromium bearing steel pipe.
The production process flow of the invention is specifically described as follows by taking a round billet with the specification of phi 105mm multiplied by 1.8-1.9 m to produce a bearing steel pipe with the specification of phi 107mm multiplied by 21mm (thickness) multiplied by 2.8-2.9 m as an example:
the feeding requirement of the round billet is as follows: the quality inspection stage is mainly divided into two parts: the first is to come the surface quality of material circle base and inspect, wherein include the surface to coming the material circle base and carry out the processing of skinning, then carefully inspect circle base surface quality, clear away the defect coping clean to can throw the material behind the rounding off of coping department. And secondly, the quality of the incoming material is checked, wherein the diameter of the round billet needs to be measured before the material is cut off, and the meter weight (weight per meter) is ensured to meet the requirement.
Material breaking and centering requirements: cutting off the incoming round billet according to the length range of 1.8-1.9 m under the condition that the rice weight meets the requirement, wherein the end part bevel is not more than 4mm; and a centering hole is formed at the head end of the round billet, the diameter d =26 +/-2 mm and the depth of the centering hole is 10-15mm, and the centering hole is required to be positioned at the center of the end part.
Heating the round billet: before the round billet enters the furnace, the atmosphere and the temperature field in the furnace are adjusted to ensure that the temperature field in the furnace is relatively uniform, the temperature of the furnace and the temperature of steel are actually measured, the temperature of a heating instrument is set according to the measured temperature difference, in the embodiment, the heating system is set according to the graph shown in FIG. 2, specifically, the temperature is increased to be 100min at the average speed of 7 ℃/min, is increased to be 700 +/-10 ℃ and is kept for 60min, and then is increased to be 50min at the average speed of 9 ℃/min, and is increased to be 1160 +/-10 ℃ and is kept for 100min. Tests show that the round billet is uniformly heated in the heating mode, and the effect of reducing the deformation resistance is most remarkable. Meanwhile, the air-fuel ratio is adjusted to keep the weak reducing atmosphere in the furnace, so that the generation of quality defects such as unnecessary weight loss or pitted surface caused by excessively thick iron scale oxidized on the surface of the steel is avoided. And the micro-positive pressure in the furnace is strictly controlled, so that the influence of the sucked cold air on the residual oxygen in the furnace and the temperature uniformity of the tube blank is avoided. In addition, the temperature field and the temperature difference in the furnace are effectively monitored at any time in the production process.
Furthermore, when arranging the arrangement positions of the round billets in the furnace, attention should be paid to the distance between the two ends of the round billets and the two rows of burners on the top of the furnace, the three sections of the round billets in the head, the middle and the tail of the round billets are uniformly heated, the billets should be turned over frequently, the production of shade and sun surfaces is avoided, the steel is turned over in the whole furnace once every 10-15 minutes, and the steel is turned over by 180 ℃. In addition, a 100mm gap is required between 5 branches before discharging so as to realize soaking.
Further, after the billet is heated, the billet is conveyed to a punching machine for punching immediately after being discharged from the furnace. During this time, care should be taken to keep the fan from blowing in register with the tap door, which must be closed each time the tapping is completed. So as to avoid influencing the subsequent billet temperature control. Thereby ensuring that the temperature of the billet still can reach about 1120-1150 ℃ when the billet is conveyed to the punching area after being discharged from the furnace.
Perforating the round billet: before the formal perforation operation is carried out on the high-carbon and high-chromium round billet, 3 samples of 20 carbon steel sample-adjusting round billets with phi 105 multiplied by 1.8m can be prepared for carrying out the adjustment of the process parameters of the perforating machine, and the outer diameter, the wall thickness and the length of the prepared steel pipe can meet the process requirements. Specifically, 3 push rods with phi 57mm, more than 3 molybdenum-based push heads with phi 60mm and guide plate 2 pairs with phi 110 can be prepared. When the perforating machine is adjusted in a production field, the roller clearance and the ejector rod retreating amount are fully considered, and after the first support material is perforated, the ejecting extension amount and the guide roller distance are finely adjusted according to the wall thickness condition. The bearing steel pipe prepared can well meet the requirements of various quality indexes until the puncher is set according to the parameters in the following table 1.
TABLE 1 Process parameter settings for high-carbon high-chromium bearing steel pipe manufacturing puncher
Specifically, a push rod with a phi 57 specification which is visually straight is selected, the center line and the holding roller gap are adjusted before punching, and a lower rolling line is easy to roll in order to reduce the abrasion of an upper guide plate.
Specifically, the molybdenum-based plug is preheated to 850-950 ℃ before piercing (the surface is dark red), and the molybdenum-based plug is strictly rolled at low temperature so as to avoid the phenomena of steel sticking and the like which influence the drilling quality and efficiency. Meanwhile, the perforation rotating speed should be controlled to be 60-70 r/min. As the 9Cr18Mo steel belongs to high-strength and difficult-deformation steel, and has large deformation resistance and rolling force, a professional electric appliance responsible person is required to monitor the current condition of the main motor on the trial-manufacture perforation site, and the main motor is prevented from being damaged due to overlarge current.
Specifically, each thread needs to be carefully checked whether the molybdenum-based plug is bonded with steel or is intact, and once a problem is found, the molybdenum-based plug needs to be polished completely, and the next thread is threaded after the plug is observed whether the temperature of the plug is proper and glass powder is uniformly coated; if the molybdenum-based plug is observed to have an excessively high temperature, attention should be paid to slow down the rolling rhythm.
Slow cooling of the capillary: it should be noted here that the perforated capillary must be immediately transferred to a slow cooling box for slow cooling, and non-technological residence cannot occur, so as to prevent the propagation of the existing cracks and the generation of new stress cracks caused by too fast temperature drop. Specifically, the inner layer of the slow cooling box and the inner layer of the cover need to be uniformly paved with heat-insulating refractory materials, the cover is covered immediately after the slow cooling box is filled with pipes, and the pipes in the box are slowly cooled (the temperature is calculated to be about 950 ℃ after the holes are punched, and the slow cooling time is not less than 8 hours) to be below 150 ℃ and then can be discharged from the slow cooling box for air cooling.
And then the cooled tube blank can be packaged and put in storage after being checked for size and surface quality.
Finally, 92% of the bearing steel pipes prepared by the production process provided by the invention can meet the quality requirements shown in the following table 2, the yield is improved by 2/3 compared with the original manufacturing process, the manufacturing cost of the bearing steel pipes is greatly reduced, and the customer satisfaction is high:
TABLE 2 quality requirements of high-carbon high-chromium bearing steel pipes
In conclusion, the method for manufacturing the high-carbon high-chromium bearing steel pipe comprises the steps of performing quality inspection on a feeding round billet; forming a centering hole in the center of the end part of the round billet subjected to the material cutting treatment; heating the round billet with the centering hole by a specific heating system; perforating the heated round billet by using the preheated top; the technology realizes the technical breakthrough of producing high-strength and high-hardness bearing steel pipes in batches in a hot perforation mode, improves the yield of metal, improves the yield by 2/3 compared with the original manufacturing process, greatly reduces the manufacturing cost of the bearing steel pipes and has wide application prospect.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (10)
1. A method of manufacturing a high-carbon high-chromium bearing steel pipe, the method comprising:
carrying out quality inspection on the feeding round billet;
a centering hole is formed in the center of the end part of the round billet after the material breaking treatment;
heating the round billet with the centering hole by a specific heating system;
perforating the heated round billet by using the preheated top;
and (4) immediately carrying out slow cooling treatment on the perforated steel pipe so as to prepare the high-carbon high-chromium bearing steel pipe.
2. The method for manufacturing a high-carbon high-chromium bearing steel pipe as claimed in claim 1,
the specific heating system is as follows: the temperature is raised to 700 +/-10 ℃ in stages, the temperature is preserved for 60min, and then the temperature is raised to 1160 +/-10 ℃ in stages, and the temperature is preserved for 100min.
3. The method for manufacturing a high-carbon high-chromium bearing steel pipe as claimed in claim 2,
the specific heating system is as follows: heating to 700 + -10 deg.C for 60min at average speed of 7 deg.C/min, heating to 1160 + -10 deg.C for 100min at average speed of 9 deg.C/min for 50 min.
4. The method for manufacturing a high-carbon high-chromium bearing steel pipe as claimed in any one of claims 1 to 3, wherein said piercing the heated round billet with the preheated plug comprises:
and controlling the temperature of the round billet before perforation to be 1120-1150 ℃.
5. The method of manufacturing a high-carbon high-chromium bearing steel pipe as claimed in claim 4, wherein said piercing the heated round billet with the preheated plug comprises:
the preheating temperature of the plug is 850-950 ℃; and the perforation rotating speed is controlled to be 60-70 r/min.
6. The method for manufacturing a high-carbon high-chromium bearing steel pipe as claimed in claim 1,
the slow cooling time is more than or equal to 8 hours, and the temperature of the steel pipe is less than or equal to 150 ℃, and the slow cooling is finished.
7. The method for manufacturing a high-carbon high-chromium bearing steel pipe as claimed in claim 1, wherein said heating a round billet with a centering hole with a specific heating profile comprises:
the air-fuel ratio in the heating furnace is adjusted to maintain the reducing atmosphere in the furnace and the positive pressure in the furnace.
8. The method for manufacturing a high-carbon high-chromium bearing steel pipe as recited in claim 1, wherein the high-carbon high-chromium bearing steel pipe has a chemical composition in percentage by weight of:
C：0.95-1.10％,Si≤0.80％,Mn≤0.80％,P≤0.040％,S≤0.030％,Ni≤0.60％,Cr：16.00～18.00％,Mo：0.40-0.70％。
9. the method for manufacturing a high-carbon high-chromium bearing steel pipe as claimed in claim 1,
the specification of the steel pipe is phi 107mm multiplied by 21mm multiplied by 2.8-2.9 m.
10. The method for manufacturing a high-carbon high-chromium bearing steel pipe as claimed in claim 9,
the parameters during the perforation of the steel pipe are set as follows: roller spacing: 90 +/-1 mm; guide plate spacing: 97 +/-1 mm; the top extension amount: 92 +/-2 mm; the diameter of the plug: 60mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211015201.XA CN115415324B (en) | 2022-08-23 | Manufacturing method of high-carbon high-chromium bearing steel pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211015201.XA CN115415324B (en) | 2022-08-23 | Manufacturing method of high-carbon high-chromium bearing steel pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115415324A true CN115415324A (en) | 2022-12-02 |
| CN115415324B CN115415324B (en) | 2024-07-16 |
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