CN111112337A - Method for manufacturing seamless steel pipe with large-diameter wall ratio - Google Patents
Method for manufacturing seamless steel pipe with large-diameter wall ratio Download PDFInfo
- Publication number
- CN111112337A CN111112337A CN201911291279.2A CN201911291279A CN111112337A CN 111112337 A CN111112337 A CN 111112337A CN 201911291279 A CN201911291279 A CN 201911291279A CN 111112337 A CN111112337 A CN 111112337A
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- steel pipe
- seamless steel
- manufacturing
- diameter
- billet
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 71
- 239000010959 steel Substances 0.000 title claims abstract description 71
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000010438 heat treatment Methods 0.000 claims abstract description 25
- 238000005096 rolling process Methods 0.000 claims abstract description 15
- 238000001816 cooling Methods 0.000 claims abstract description 12
- 238000005520 cutting process Methods 0.000 claims abstract description 6
- 230000009467 reduction Effects 0.000 claims abstract description 6
- 238000004513 sizing Methods 0.000 claims description 9
- 239000012267 brine Substances 0.000 claims description 4
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 4
- 239000000047 product Substances 0.000 abstract description 7
- 238000005265 energy consumption Methods 0.000 abstract description 6
- 239000003595 mist Substances 0.000 abstract description 5
- 150000003839 salts Chemical class 0.000 abstract description 5
- 239000007795 chemical reaction product Substances 0.000 abstract description 4
- 230000008569 process Effects 0.000 description 18
- 238000001514 detection method Methods 0.000 description 7
- 239000000243 solution Substances 0.000 description 5
- 238000005259 measurement Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000007921 spray Substances 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
- 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
- B21B19/06—Rolling hollow basic material, e.g. Assel mills
- B21B19/08—Enlarging tube diameter
-
- 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
- B21B19/06—Rolling hollow basic material, e.g. Assel mills
- B21B19/10—Finishing, e.g. smoothing, sizing, reeling
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a method for manufacturing a seamless steel pipe with a large radial wall ratio, which comprises the following steps: heating the steel billet in a heating furnace; using a puncher to punch the billet into a capillary; performing wall reduction and diameter expansion rolling on the hollow billet by using a rotary pipe expander; carrying out leveling rolling; determining (reducing) the diameter; cooling by using a cooling bed, and straightening by using a straightening machine; cutting off the head and the tail of the steel pipe to be sawn into required lengths; and (5) checking and accepting to finish the manufacture of the seamless steel pipe finished product. The method for manufacturing the seamless steel tube with the large radial wall ratio solves the technical problems that the method for manufacturing the seamless steel tube with the large radial wall ratio in the prior art needs heating and deformation for multiple times, so that the energy consumption is high, the yield is low, the manufacturing period is long, the manufacturing cost is high, salt mist pollution is caused, the wall thickness precision of drawing and expanding is low, the surface quality is poor, pushing and expanding are only suitable for small-batch low-end products, and the like.
Description
Technical Field
The invention belongs to the technical field of metal hot working processes, and particularly relates to a method for manufacturing a seamless steel pipe with a large radial wall ratio.
Background
The present manufacturing method is a long-flow process mode of two-step heating deformation forming, namely, a first step of preparing a raw material steel pipe and a second step of manufacturing a finished seamless steel pipe. Fig. 1 shows a first step in a manufacturing process of a large-diameter wall ratio seamless steel pipe in the prior art, and the specific process flow comprises the following steps: heating a billet in a heating furnace → piercing the billet into a hollow billet by using a piercer → extending a rolled pipe → sizing (reducing) the diameter → cooling, straightening → sawing the head and the tail of the steel pipe (sawing to a required length) → flaw detection, detection → measurement, marking → production of a raw steel pipe. The second step in the prior art process for manufacturing the large-diameter wall ratio seamless steel pipe has three different process flows as shown in fig. 2a, 2b and 2c respectively. As shown in fig. 2a, the first process flow of the second step specifically includes: heating a raw material steel pipe → performing wall reduction and diameter expansion rolling by using a rotary pipe expander → leveling rolling → heating (temperature compensation and temperature equalization) → diameter fixing (reducing) → cooling, straightening → sawing the head and the tail of the steel pipe (sawing to a required length) → flaw detection, detection → measurement, marking → a finished seamless steel pipe; as shown in fig. 2b, the second process flow of the second step specifically includes: heating the end of a raw steel pipe, expanding the bell mouth at the end of the raw steel pipe, heating the whole raw steel pipe, drawing in multiple passes, reducing the wall and expanding the diameter (needing to be heated again and deformed for expanding the diameter), cutting off the bell mouth at the end of the pipe, cooling, straightening, sawing the head and the tail of the steel pipe (sawing the steel pipe to the needed length), detecting, measuring, marking → finishing the seamless steel pipe; as shown in fig. 2c, the third process flow of the second step specifically includes: induction heating of a raw material steel pipe → pushing equal wall lengthening and diameter expanding deformation → cooling, straightening → sawing the head and the tail of the steel pipe (sawing to the required length) → flaw detection, detection → measurement, marking → a finished seamless steel pipe.
The method for manufacturing the large-diameter wall seamless steel tube in the prior art has the following defects that ① needs to be heated and deformed for two or more times in the whole manufacturing process from a steel billet to a finished product, so that the heating energy consumption is high, ② needs to saw a tube head and a tube tail for many times, so that the metal consumption is high, the yield is low, usually about 80% or lower, ③ has multiple working procedures, so that the manufacturing period is long, the manufacturing cost is high, ④ needs to spray concentrated brine into a deformation region tube to remove furnace-generated oxidized iron sheets during rotary wall-reducing and diameter-expanding rolling, so that larger salt mist pollution is generated, a finished product manufactured by ⑤ multi-pass wall-drawing wall-reducing and diameter-expanding process is low in wall thickness precision and poor in surface quality, and ⑥ pushing wall-reducing, diameter-expanding and deforming process is only suitable for manufacturing low-end products and.
Disclosure of Invention
Therefore, it is an urgent technical problem to be solved by those skilled in the art to overcome the drawbacks of the conventional method for manufacturing a seamless steel pipe with a large wall ratio, and to provide a method for manufacturing a seamless steel pipe with a large wall ratio with high efficiency and low consumption.
Therefore, the invention provides a method for manufacturing a seamless steel pipe with a large radial wall ratio, which comprises the following steps: heating the steel billet in a heating furnace; using a puncher to punch the billet into a capillary; performing wall reduction and diameter expansion rolling on the hollow billet by using a rotary pipe expander; carrying out leveling rolling; determining (reducing) the diameter; cooling by using a cooling bed, and straightening by using a straightening machine; cutting off the head and the tail of the steel pipe to be sawn into required lengths; and (5) checking and accepting to finish the manufacture of the seamless steel pipe finished product.
Preferably, in the method for producing a large-diameter wall-ratio seamless steel pipe, the billet is pierced into a hollow billet by using a piercing mill, the hollow billet is subjected to wall-reducing and diameter-expanding rolling by a rotary pipe expander directly after the hollow billet is pierced into the hollow billet, and the inside of the deformation zone is not sprayed with brine.
Preferably, in the method for producing a large-diameter wall ratio seamless steel pipe, after the reduction and expansion rolling of the hollow billet, the pipe is heated to compensate for temperature and equalize temperature.
Preferably, in the above method for manufacturing a seamless steel pipe with a large diameter wall ratio, the step of sizing (reducing) the diameter includes: based on the specification requirements of the finished seamless steel tube product, sizing is carried out on the pipe fittings after the pipe fittings are rolled evenly by using a sizing mill or reducing is carried out on the pipe fittings after the pipe fittings are rolled evenly by using a reducing mill.
Preferably, in the above method for manufacturing a large-diameter wall ratio seamless steel pipe, the acceptance step includes flaw detection, inspection, measurement and marking of the steel pipe sawn into a desired length.
The manufacturing method of the seamless steel pipe with the large radial wall ratio solves the defects and shortcomings that the manufacturing method of the seamless steel pipe with the large radial wall ratio in the prior art needs heating and deformation for multiple times, so that the energy consumption is high, the yield is low, the manufacturing period is long, the manufacturing cost is high, salt mist pollution is caused, the wall thickness precision of drawing and expanding is low, the surface quality is poor, and pushing and expanding are only suitable for small-batch low-end products.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
FIG. 1 is a schematic process flow diagram of the first step in the prior art process for manufacturing a large-diameter wall ratio seamless steel tube;
FIGS. 2a, 2b and 2c are schematic diagrams showing three process flows of a second step in the prior art process for manufacturing a large-diameter-wall-ratio seamless steel pipe;
FIG. 3 is a schematic flow chart of the method for manufacturing a seamless steel pipe with a large wall ratio according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 3, the method for manufacturing a seamless steel pipe with a large wall ratio of the present invention comprises the steps of: (1) heating a billet in a heating furnace, (2) piercing the billet into a hollow billet by using a piercer, (3) performing wall-reducing and diameter-expanding rolling on the hollow billet by using a rotary pipe expander, (4) heating to perform necessary temperature compensation and temperature equalization, (5) performing temper rolling, (6) determining (reducing) the diameter, (7) cooling by using a cooling bed, straightening by using a straightener, (8) cutting the head and the tail of the steel pipe to cut the steel pipe into a required length, (9) detecting and detecting, and (10) measuring and marking, thereby completing the manufacture of a finished seamless steel pipe.
In the above method for manufacturing a seamless steel pipe with a large wall ratio, the step (6) of determining (reducing) the diameter may include: based on the specification requirements of the finished seamless steel tube product, sizing the uniformly rolled tube by using a sizing mill or reducing the uniformly rolled tube by using a reducing mill; steps (9) and (10) may be integrated into an acceptance step.
In the method for manufacturing the large-diameter wall ratio seamless steel tube, the billet is punched to form the capillary tube, and then the rotary pipe expander is directly used for reducing the wall and expanding the diameter of the capillary tube, namely the method for manufacturing the large-diameter wall ratio seamless steel tube adopts a short-flow process of one-step heating deformation forming of 'punching and rotary expanding', the production and manufacturing period of the seamless steel tube is greatly shortened, meanwhile, the deformed metal is prevented from being heated for many times, the energy is saved, and the heating energy consumption of unit products can be reduced by about 50%.
In the method for manufacturing the seamless steel pipe with the large-diameter wall ratio, wall reduction and diameter expansion are carried out after perforation, and a secondary heating process is not needed, so that strong brine does not need to be sprayed in the pipe in a deformation area, the salt mist pollution is thoroughly avoided, and the production environment is good.
In the method for manufacturing the large-diameter wall seamless steel tube, the tube head and the tube tail are not required to be heated and sawed repeatedly, so that the burning loss is less, the tube end head and the tube tail are less in cutting loss, the yield is high, and the yield can be improved by about 10%.
In the method for manufacturing a large-diameter wall ratio seamless steel pipe according to the present invention, the total manufacturing cost of the seamless steel pipe is significantly reduced because of low heating energy consumption, high yield, and few deformation processes.
In conclusion, the method for manufacturing the seamless steel pipe with the large-caliber-wall ratio solves the defects and shortcomings that the method for manufacturing the seamless steel pipe with the large-caliber-wall ratio in the prior art needs heating and deformation for multiple times, so that the method is high in energy consumption, low in yield, long in manufacturing period, high in manufacturing cost, low in wall thickness precision of drawing and expanding, poor in surface quality, only suitable for small-batch low-end products and the like, and salt mist pollution is caused.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be further noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and are not limited thereto; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or alterations do not depart from the spirit of the invention.
Claims (5)
1. A method of manufacturing a large bore wall ratio seamless steel pipe, the method comprising the steps of:
heating the steel billet in a heating furnace;
using a puncher to punch the billet into a capillary;
performing wall reduction and diameter expansion rolling on the hollow billet by using a rotary pipe expander;
carrying out leveling rolling;
determining (reducing) the diameter;
cooling by using a cooling bed, and straightening by using a straightening machine;
cutting off the head and the tail of the steel pipe to be sawn into required lengths;
and (5) checking and accepting to finish the manufacture of the seamless steel pipe finished product.
2. The method of manufacturing a large-bore wall ratio seamless steel pipe according to claim 1, wherein the billet is directly subjected to wall-reducing and diameter-expanding rolling by a rotary expander after being pierced into a hollow billet by the piercer, and no concentrated brine is sprayed into the pipe in the deformation zone.
3. The method of manufacturing a large-diameter wall ratio seamless steel pipe according to claim 1, wherein after the wall-reducing and diameter-expanding rolling of the hollow billet, the pipe is heated to compensate and equalize the temperature.
4. The method of manufacturing a large diameter wall ratio seamless steel pipe according to claim 1, wherein the step of sizing (reducing) the diameter comprises: based on the specification requirements of the finished seamless steel tube product, sizing is carried out on the pipe fittings after the pipe fittings are rolled evenly by using a sizing mill or reducing is carried out on the pipe fittings after the pipe fittings are rolled evenly by using a reducing mill.
5. A method of manufacturing a large diameter wall ratio seamless steel pipe according to claim 1 wherein said step of accepting comprises inspecting, measuring and marking the steel pipe sawn to a desired length.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911291279.2A CN111112337A (en) | 2019-12-16 | 2019-12-16 | Method for manufacturing seamless steel pipe with large-diameter wall ratio |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911291279.2A CN111112337A (en) | 2019-12-16 | 2019-12-16 | Method for manufacturing seamless steel pipe with large-diameter wall ratio |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111112337A true CN111112337A (en) | 2020-05-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911291279.2A Pending CN111112337A (en) | 2019-12-16 | 2019-12-16 | Method for manufacturing seamless steel pipe with large-diameter wall ratio |
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| Country | Link |
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| CN (1) | CN111112337A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112775186A (en) * | 2020-12-17 | 2021-05-11 | 太原重工工程技术有限公司 | Production method of hot-rolled seamless steel tube |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6156746A (en) * | 1984-08-25 | 1986-03-22 | Sumitomo Metal Ind Ltd | Expanding method of seamless steel tube |
| CN104148489A (en) * | 2014-08-07 | 2014-11-19 | 北京京诚之星科技开发有限公司 | Method and system for producing large-caliber medium-thin wall seamless steel pipe |
| CN105234200A (en) * | 2015-11-19 | 2016-01-13 | 扬州诚德钢管有限公司 | On-line tube-expanding production process of large-diameter seamless steel tubes |
| CN109457178A (en) * | 2018-11-05 | 2019-03-12 | 衡阳华菱钢管有限公司 | Steel alloy, seamless steel pipe and preparation method thereof, drilling water-separation pipe |
-
2019
- 2019-12-16 CN CN201911291279.2A patent/CN111112337A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6156746A (en) * | 1984-08-25 | 1986-03-22 | Sumitomo Metal Ind Ltd | Expanding method of seamless steel tube |
| CN104148489A (en) * | 2014-08-07 | 2014-11-19 | 北京京诚之星科技开发有限公司 | Method and system for producing large-caliber medium-thin wall seamless steel pipe |
| CN105234200A (en) * | 2015-11-19 | 2016-01-13 | 扬州诚德钢管有限公司 | On-line tube-expanding production process of large-diameter seamless steel tubes |
| CN109457178A (en) * | 2018-11-05 | 2019-03-12 | 衡阳华菱钢管有限公司 | Steel alloy, seamless steel pipe and preparation method thereof, drilling water-separation pipe |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112775186A (en) * | 2020-12-17 | 2021-05-11 | 太原重工工程技术有限公司 | Production method of hot-rolled seamless steel tube |
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Application publication date: 20200508 |