CN113333499A - Steel pipe forming method and steel pipe - Google Patents
Steel pipe forming method and steel pipe Download PDFInfo
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- CN113333499A CN113333499A CN202110639710.9A CN202110639710A CN113333499A CN 113333499 A CN113333499 A CN 113333499A CN 202110639710 A CN202110639710 A CN 202110639710A CN 113333499 A CN113333499 A CN 113333499A
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- pipe
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 285
- 239000010959 steel Substances 0.000 title claims abstract description 285
- 238000000034 method Methods 0.000 title claims abstract description 98
- 238000005096 rolling process Methods 0.000 claims abstract description 93
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 56
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 50
- 239000011651 chromium Substances 0.000 claims abstract description 50
- 230000008569 process Effects 0.000 claims abstract description 47
- 238000003466 welding Methods 0.000 claims abstract description 38
- 238000010438 heat treatment Methods 0.000 claims abstract description 32
- 238000001816 cooling Methods 0.000 claims description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 238000005336 cracking Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 7
- 238000000137 annealing Methods 0.000 description 6
- 239000013078 crystal Substances 0.000 description 4
- 238000007790 scraping Methods 0.000 description 4
- 241000519995 Stachys sylvatica Species 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 230000008646 thermal stress Effects 0.000 description 3
- 238000005261 decarburization Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/08—Making tubes with welded or soldered seams
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B23/00—Tube-rolling not restricted to methods provided for in only one of groups B21B17/00, B21B19/00, B21B21/00, e.g. combined processes planetary tube rolling, auxiliary arrangements, e.g. lubricating, special tube blanks, continuous casting combined with tube rolling
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/17—Rigid pipes obtained by bending a sheet longitudinally and connecting the edges
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat Treatment Of Articles (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The application provides a steel pipe forming method and a steel pipe, and relates to the technical field of pipeline forming, wherein the steel pipe forming method can reduce cracks generated in the steel belt rolling process of high-carbon chromium bearing steel by heating a steel belt and rolling for multiple times to prepare a pipe blank; finally, the manufactured tube blank is welded to manufacture the steel tube, so that a large number of cracks easily generated in the steel tube forming process are reduced; the steel pipe is prepared by adopting a comprehensive mode of continuous rolling and welding for multiple times, and a large number of cracks generated in the steel pipe forming process of the thin-wall high-carbon chromium bearing steel can be reduced and the cracking generated in the use process of the steel pipe of the high-carbon chromium bearing steel can be reduced.
Description
Technical Field
The application relates to the technical field of pipeline forming, in particular to a forming method of a steel pipe and the steel pipe.
Background
The high-carbon chromium bearing steel has higher hardness, uniform structure, good wear resistance and high contact fatigue performance, and is very suitable for being used as a concrete conveying pipe.
In the prior art, high-carbon chromium bearing steel has high carbon content and large brittleness, and has high sensitivity to white spots and is easy to generate white spots; therefore, in the process of manufacturing and forming the thin-wall high-carbon chromium bearing steel pipe, a large number of cracks are easily generated in the high-carbon chromium bearing steel pipe, so that the high-carbon chromium bearing steel pipe is likely to crack in the using process.
Disclosure of Invention
In view of the above, the application provides a forming method of a steel pipe and a steel pipe, which solve or improve the technical problem that in the prior art, in the process of manufacturing and forming a thin-wall high-carbon chromium bearing steel pipe, a large number of cracks are easily generated in the high-carbon chromium bearing steel pipe, so that the high-carbon chromium bearing steel pipe is likely to crack in the using process.
According to an aspect of the present application, there is provided a method of forming a steel pipe, comprising: heating a steel strip, wherein the steel strip is high-carbon chromium bearing steel; continuously rolling the heated steel strip for multiple times to obtain a tube blank; wherein the tube blank comprises: the tube blank comprises a tubular tube blank body and a connecting part, wherein the connecting part is arranged on the tube blank body and extends along the length direction of the tube blank body; and welding the connecting part to obtain the steel pipe.
In one possible implementation, heating the steel strip includes: and heating the steel strip to 600-950 ℃.
In one possible implementation manner, the rolling the heated steel strip for multiple times in succession to produce the tube blank includes: vertically rolling the heated steel strip to obtain a steel strip with a U-shaped section; carrying out multiple transverse rolling and multiple vertical rolling and rolling on the steel belt with the U-shaped section until the pipe blank with the O-shaped section is manufactured; wherein the last rolling roll is the transverse rolling roll.
In a possible implementation manner, in the process of welding the connecting part to manufacture the steel pipe, the welding temperature is 1300-1500 ℃.
In one possible implementation mode, the steel strip is high-carbon chromium bearing steel subjected to spheroidizing annealing treatment, and the carbon content of the high-carbon chromium bearing steel is not less than 0.6% by mass.
In a possible implementation manner, after the welding is performed on the connection part to obtain the steel pipe, the forming method further includes: and carrying out heat treatment on the steel pipe.
In one possible implementation, the heat treating the steel pipe includes: heating the connecting part of the steel pipe to 750-1050 ℃; and cooling the heated steel pipe to 300-500 ℃ in air, and then cooling the steel pipe to the normal temperature by water.
In one possible implementation manner, the cooling the heated steel pipe to 300-500 ℃ in air includes: and cooling the heated steel pipe to 300-500 ℃ in air, and straightening the steel pipe by adopting a straightening roller in the cooling process.
In one possible implementation, welding the connection portion to obtain the steel pipe includes: clamping the tube blank by adopting a clamp, and welding the connecting part to obtain the steel tube; the clamping force of the clamp is 5-30 Mpa, and the direction of the clamping force is perpendicular to the extending direction of the connecting portion.
According to another aspect of the present application, there is provided a steel pipe prepared by the above-described method of forming a steel pipe.
According to the forming method of the steel pipe, the steel belt is heated and rolled for multiple times, so that cracks generated in the steel belt rolling process of the high-carbon chromium bearing steel can be reduced, and a pipe blank is manufactured; finally, the manufactured tube blank is welded to manufacture the steel tube, so that a large number of cracks easily generated in the steel tube forming process are reduced; the steel pipe is prepared by adopting a comprehensive mode of continuous rolling and welding for multiple times, and a large number of cracks generated in the steel pipe forming process of the thin-wall high-carbon chromium bearing steel can be reduced and the cracking generated in the use process of the steel pipe of the high-carbon chromium bearing steel can be reduced.
Drawings
FIG. 1 is a process flow diagram of a method for forming a steel pipe according to the present invention;
FIG. 2 is a schematic view showing the structure of a tube blank of a steel tube according to the present invention;
fig. 3 is a second schematic structural view of a tube blank of the steel tube provided by the present application;
FIG. 4 is a process flow diagram of another method of forming a steel pipe according to the present application;
FIG. 5 is a process flow diagram of another method of forming a steel pipe according to the present application;
FIG. 6 is a schematic view of a rolling structure in a process flow chart of another method for forming a steel pipe according to the present application;
FIG. 7 is a schematic view of a rolling structure in a process flow chart of another method for forming a steel pipe according to the present application;
FIG. 8 is a schematic view of a rolling structure in a process flow chart of another method for forming a steel pipe according to the present application;
FIG. 9 is a process flow diagram of another method of forming a steel pipe according to the present application;
FIG. 10 is a process flow diagram of another method of forming a steel pipe according to the present application;
FIG. 11 is a process flow diagram of another method of forming a steel pipe according to the present application;
FIG. 12 is a process flow diagram of another method of forming a steel pipe according to the present application;
fig. 13 is a process flow chart of another method for forming a steel pipe according to the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 application.
Fig. 1 is a process flow chart of a forming method of a steel pipe provided by the present application, and as shown in fig. 1, the forming method includes the following steps:
step S100, heating a steel strip, wherein the steel strip is high-carbon chromium bearing steel;
optionally, the steel strip is a high-carbon chromium bearing steel strip subjected to spheroidizing annealing treatment; the spheroidizing annealing can reduce the brittleness of the high-carbon chromium bearing steel of the steel strip, improve the flexibility of the high-carbon chromium bearing steel, and reduce the possibility that a large number of cracks are generated in the process of manufacturing the steel pipe of the high-carbon chromium bearing steel, so that the yield of the steel pipe of the high-carbon chromium bearing steel is improved.
In addition, the high-carbon chromium bearing steel of the steel strip is high-carbon chromium bearing steel with the carbon content of not less than 0.6% by mass fraction. Specifically, the high-carbon chromium bearing steel includes: high-carbon chromium bearing steel of any one model of GCr4, GCr15, GCr15SiMn, GCr15SiMo, GCr18Mo and G8Cr 15.
Step S200, continuously rolling the heated steel belt for multiple times to obtain a pipe blank;
wherein fig. 2 is a front view of the tube blank obtained in step S200, and fig. 3 is a left side view of the tube blank obtained in step S200, and as shown in fig. 2 and 3, the tube blank includes: a tubular blank body 11, and a connecting portion 12 provided on the blank body 11 and extending in a longitudinal direction of the blank body 11;
and step S200, the heated steel strip is continuously rolled and rolled for multiple times, and the steel strip of the high-carbon chromium bearing steel is heated in the rolling and rolling process, so that the flexibility of the high-carbon chromium bearing steel can be increased, the brittleness of the high-carbon bearing steel is reduced, and cracks generated in the continuous rolling and rolling process of the steel strip of the high-carbon chromium bearing steel for multiple times are reduced.
Step S300, welding the connecting part 12 to obtain a steel pipe;
in step S300, the joint 12 of the raw pipe is welded, and the opposite end (i.e., the joint 12) of the tubular raw pipe body 11 prepared in step S200 is further welded to produce a steel pipe.
According to the forming method of the steel pipe, the steel belt is heated and rolled for multiple times, so that cracks generated in the steel belt rolling process of the high-carbon chromium bearing steel can be reduced, and a pipe blank is manufactured; finally, the manufactured tube blank is welded to manufacture the steel tube, so that a large number of cracks easily generated in the steel tube forming process are reduced; the steel pipe is prepared by adopting a comprehensive mode of continuous rolling and welding for multiple times, and a large number of cracks generated in the steel pipe forming process of the thin-wall high-carbon chromium bearing steel can be reduced and the cracking generated in the use process of the steel pipe of the high-carbon chromium bearing steel can be reduced.
In a possible implementation manner, fig. 4 is a process flow chart of another steel pipe forming method provided in the present application, and as shown in fig. 4, step S200 (rolling and rolling a heated steel strip for multiple times in succession to obtain a tube blank) specifically includes the following steps:
step S201, heating the steel strip to 600-950 ℃, and continuously rolling and rolling the heated steel strip for multiple times to obtain a tube blank; wherein, the pipe blank includes: a tubular blank body 11, and a connecting portion 12 provided on the blank body 11 and extending in a longitudinal direction of the blank body 11.
Heating the steel strip to 600-950 ℃ in the step S201, wherein the steel strip is heated mainly for fully decomposing carbide of high-carbon chromium bearing steel of the steel strip in a high-temperature region and greatly improving the transformation rate of austenite; but at the same time the temperature must not be too high, otherwise the risk of overheating and decarburization may occur; therefore, the steel strip of the high-carbon chromium bearing steel is heated to 600-950 ℃, the high-carbon chromium bearing steel of the steel strip is free of decarburization, the brittleness of the high-carbon chromium bearing steel is reduced, the flexibility reaches the optimal state, a large number of cracks are not easy to generate in the rolling and rolling process of the steel strip of the high-carbon chromium bearing steel, and the prepared tube blank is not easy to generate white spots and cracks.
The steel strip is heated to 600-950 ℃, so that the brittleness of the high-carbon chromium bearing steel of the steel strip is reduced and the flexibility of the high-carbon chromium bearing steel of the steel strip is improved due to the fact that the steel strip of the high-carbon chromium bearing steel is uniformly heated, the probability that a large number of cracks are generated in the steel strip of the high-carbon chromium bearing steel in the process of rolling and rolling for many times can be reduced, and the rate of finished products of the steel tubes of the high-carbon chromium bearing steel is improved.
More specifically, the temperature at which the steel strip is heated in step S201 may be 600 ℃, 650 ℃, 700 ℃, 750 ℃, 800 ℃, 850 ℃, 900 ℃, 950 ℃ or any value therebetween.
In a possible implementation manner, fig. 5 is a process flow chart of another steel pipe forming method provided by the present application, fig. 6 is a schematic view of a rolling structure in the process flow chart of the another steel pipe forming method provided by the present application, and fig. 7 is a schematic view of a rolling structure in the process flow chart of the another steel pipe forming method provided by the present application; FIG. 8 is a schematic view of a rolling structure in a process flow chart of another method for forming a steel pipe according to the present application; as shown in fig. 5, step S200 (rolling the heated steel strip continuously for a plurality of times to obtain a tube blank) specifically includes the following steps:
step S201, heating the steel belt 23 to 600-950 ℃;
step S202, performing vertical rolling and rolling on the heated steel strip 23 to obtain a steel strip with a U-shaped cross section, as shown in fig. 6, in step S202, performing vertical rolling and rolling on the heated steel strip 23 by using a vertical roller 21, and forming a U-shaped rolling cross section of the steel strip 23;
step S203, carrying out multiple times of transverse rolling and multiple times of vertical rolling and rolling on the steel belt 23 with the U-shaped section; until the tube blank with the O-shaped section is manufactured;
as shown in fig. 7, step S203 is to perform a transverse rolling and rolling process on the steel strip 23 having the U-shaped cross section by using the transverse rolling roller 22, wherein the transverse rolling and rolling process 22 includes: 9 groups of transverse rollers or 5 groups of transverse rollers, and the number of the transverse rollers is selected according to the required transverse rolling pressure in the rolling process;
repeating vertical rolling and horizontal rolling and rolling on the steel belt 23 with the U-shaped section; or simultaneously carrying out vertical rolling and transverse rolling and rolling until a pipe blank with an O-shaped section is manufactured; wherein the last rolling roll is a transverse rolling roll as shown in fig. 8.
After step S201, and repeating step S202 and step S203, a tube blank is produced, which includes, as shown in fig. 2 and 3: a tubular blank body 11, and a connecting portion 12 provided on the blank body 11 and extending in a longitudinal direction of the blank body 11.
Heating a steel strip, and repeatedly rolling the steel strip by adopting vertical rolling and transverse rolling to obtain a tube blank; the last rolling is transverse rolling, and the rolling mode is simple and easy to operate.
In a possible implementation manner, fig. 9 is a process flow chart of another method for forming a steel pipe provided in the present application, and as shown in fig. 9, step S300 (welding the connection portion 12 to obtain the steel pipe) specifically includes the following steps:
step S301, welding the connecting part 12 at 1300-1500 ℃ to obtain a steel pipe; when the welding temperature is lower than 1300 ℃, the crystal grain size of the connecting part 12 is small, the brittleness is large, and the high-carbon chromium bearing steel of the welded connecting part 12 is easy to crack; when the welding temperature is more than 1500 ℃, the crystal grain size becomes large and the low-temperature toughness is lowered. Therefore, the welding temperature is 1300-1500 ℃, and the connecting part is not easy to crack after the thermal stress is released.
More specifically, the welding temperature of the connection part 12 in step S301 may be 1300 ℃, 1350 ℃, 1400 ℃, 1450 ℃, 1500 ℃, and any value therebetween.
In a possible implementation manner, fig. 10 is a process flow chart of another method for forming a steel pipe provided in the present application, and as shown in fig. 10, after step S301 (welding the connection portion 12 at a welding temperature of 1300-1500 ℃ to obtain the steel pipe), the method further includes the following steps:
step S400, heat treatment is performed on the steel pipe.
Through carrying out heat treatment on the prepared steel pipe, the strength of the steel pipe can be improved, the wear resistance of the steel pipe is enhanced, and the service life of the steel pipe is prolonged.
In a possible implementation manner, fig. 11 is a process flow chart of another method for forming a steel pipe provided in the present application, and as shown in fig. 11, step S400 (performing heat treatment on the steel pipe) specifically includes the following steps:
step S401, heating the connecting part 12 of the steel pipe to 750-1050 ℃;
step S401, heating the connecting part 12 of the steel pipe to 750-1050 ℃, wherein the grain size of the high-carbon chromium bearing steel crystal of the connecting part 12 is small, the flexibility and the cohesiveness of the high-carbon bearing steel of the connecting part 12 reach the optimal state, and the probability of cracking of the connecting part 12 after welding is reduced;
step S402, cooling the heated steel pipe to 300-500 ℃ in air;
in step S402, the heated steel pipe is cooled in the air to a temperature lower than 300 ℃ so that the crystal grain size cannot be better refined, the deformation force of the steel pipe higher than 300 ℃ is not eliminated, and the steel pipe is cracked due to direct water cooling, so that the heated steel pipe is cooled in the air to a temperature of 300-500 ℃, the obtained steel pipe is thinner in structure and is not easy to crack;
step S403, cooling the water to normal temperature;
step S403 is to cool the steel pipe to room temperature quickly by water cooling.
The steel pipe is heated, cooled in air and cooled to normal temperature through the heat treatment steps, so that the strength of the steel pipe is improved, the wear resistance of the steel pipe is enhanced, and the service life of the steel pipe is prolonged.
More specifically, in step S401, the temperature at which the connection portion 12 of the steel pipe is heated may be 750 ℃, 800 ℃, 850 ℃, 900 ℃, 950 ℃, 1000 ℃, 1050 ℃, or any value therebetween.
More specifically, the temperature at which the heated steel pipe is cooled in the air in step S402 may be 300 ℃, 350 ℃, 400 ℃, 450 ℃, 500 ℃ or any value therebetween.
In a possible implementation manner, fig. 12 is a process flow chart of another method for forming a steel pipe provided in the present application, and as shown in fig. 12, step S402 (cooling the heated steel pipe to 300-500 ℃ in air) specifically includes the following steps:
step S4021, cooling the heated steel pipe to 300-500 ℃ in air, and straightening the steel pipe by using a straightening roller in the cooling process;
step S4021 is to straighten the steel pipe by using straightening rolls while cooling the heated steel pipe in air, thereby improving the quality of the steel pipe.
In a possible implementation manner, fig. 13 is a process flow chart of another method for forming a steel pipe provided in the present application, and as shown in fig. 13, step S301 (welding the connection portion 12 at a welding temperature of 1300-1500 ℃ to obtain the steel pipe) specifically includes the following steps:
step S3011, clamping the pipe blank by using a clamp, wherein the clamping force of the clamp in the clamping process is 5-30 Mpa; the direction of the clamping force is vertical to the extending direction of the connecting part 12; meanwhile, welding the connecting part 12 at 1300-1500 ℃ to obtain a steel pipe;
in the welding process, the pipe blank is clamped by a clamp, so that the connection part 12 is connected more tightly, and the probability of cracking of the connection part 12 is reduced;
step S3112, scraping off burrs after welding of the welded connecting part 12 by using a scraper; cooling to 200-500 ℃ in air, and removing the clamp;
the burrs after the welding of the connecting part 12 are scraped off, so that the connecting part of the steel pipe is smooth, the temperature of the steel pipe is gradually reduced in the air, and the connecting part 12 of the steel pipe is not easy to crack under the action of the loss of thermal stress of the steel pipe; at this time, the jig is removed, and the steel pipe is heated, that is, step S401 and the subsequent steps are performed.
When the connecting part 12 is welded, the pipe blank is clamped by using a clamp, so that the welding performance of the pipe blank is improved; cooling in the air, and removing the clamp, so that the connecting part 12 is not easy to crack after the welded steel pipe loses the thermal stress; and the steel pipe is subjected to heat treatment, so that the strength of the steel pipe can be improved, the wear resistance of the steel pipe is enhanced, and the service life of the steel pipe is prolonged.
More specifically, in step S3011, the clamping force of the clamp may be 5Mpa, 10Mpa, 15Mpa, 20Mpa, 25Mpa, 30Mpa, or any value therebetween.
The method for forming a steel pipe provided by the present application will be further described below with reference to specific examples, which are only examples of conditions used to confirm the applicability and effects of the present application, but the present application is not limited to these examples.
(example 1)
The forming method of the steel pipe provided by the embodiment comprises the following steps:
step S10: heating the steel strip of the high-carbon chromium bearing steel after spheroidizing annealing;
step S11: heating the steel strip to 600 ℃;
step S12: vertically rolling the heated steel strip by using a vertical roller to obtain a steel strip with a U-shaped section;
step S13: selecting 9 groups of transverse rollers to perform multiple transverse rolling and multiple vertical rolling and rolling on the steel belt with the U-shaped section until a pipe blank with an O-shaped section is manufactured; in this case, as shown in fig. 2 and 3, the tube blank includes: a tubular blank body 11, and a connecting portion 12 provided on the blank body 11 and extending in a longitudinal direction of the blank body 11; wherein the last rolling is transverse rolling;
step S14: clamping the tube blank by adopting a clamp, wherein the clamping force in the clamping process is 30 Mpa; the direction of the clamping force is vertical to the extending direction of the connecting part, and the tube blank is clamped; meanwhile, welding the connecting part 12 at 1500 ℃ to obtain a steel pipe;
step S15: cooling the steel pipe to 500 ℃ in air; scraping off burrs after welding of the connecting part 12 by using a scraper, and removing the clamp;
step S16: heating the connecting part 12 of the steel pipe to 1050 ℃; cooling to 300 ℃ in air, and straightening the steel pipe by adopting a straightening roller;
step S17: and (5) cooling the water to the normal temperature.
(example 2)
The forming method of the steel pipe provided by the embodiment comprises the following steps:
step S20: heating the steel strip of the high-carbon chromium bearing steel after spheroidizing annealing;
step S21: heating the steel strip to 950 ℃;
step S22: vertically rolling the heated steel strip by using a vertical roller to obtain a steel strip with a U-shaped section;
step S23: selecting 9 groups of transverse rollers to perform multiple transverse rolling and multiple vertical rolling and rolling on the steel belt with the U-shaped section until a pipe blank with an O-shaped section is manufactured; in this case, as shown in fig. 2 and 3, the tube blank includes: a tubular blank body 11, and a connecting portion 12 provided on the blank body 11 and extending in a longitudinal direction of the blank body 11; wherein the last rolling is transverse rolling;
step S24: clamping the tube blank by adopting a clamp, wherein the clamping force in the clamping process is 5 Mpa; the direction of the clamping force is vertical to the extending direction of the connecting part, and the tube blank is clamped; meanwhile, welding the connecting part 12 at 1300 ℃ to obtain a steel pipe;
step S25: cooling the steel pipe to 200 ℃ in air; scraping off burrs after welding of the connecting part 12 by using a scraper; removing the clamp;
step S26: heating the connecting part 12 of the steel pipe to 750 ℃; cooling to 500 ℃ in rolling air, and straightening the steel pipe by adopting a straightening roller;
step S27: and (5) cooling the water to the normal temperature.
(example 3)
The forming method of the steel pipe provided by the embodiment comprises the following steps:
step S30: heating the steel strip of the high-carbon chromium bearing steel after spheroidizing annealing;
step S31: heating the steel strip to 750 ℃;
step S32: vertically rolling the heated steel strip by using a vertical roller to obtain a steel strip with a U-shaped section;
step S33: selecting 5 groups of transverse rollers to perform multiple transverse rolling and multiple vertical rolling and rolling on the steel belt with the U-shaped section until a pipe blank with an O-shaped section is manufactured; in this case, as shown in fig. 2 and 3, the tube blank includes: a tubular blank body 11, and a connecting portion 12 provided on the blank body 11 and extending in a longitudinal direction of the blank body 11; wherein the last rolling is transverse rolling;
step S34: clamping the tube blank by adopting a clamp, wherein the clamping force in the clamping process is 15 Mpa; the direction of the clamping force is vertical to the extending direction of the connecting part, and the tube blank is clamped; meanwhile, welding the connecting part 12 at 1400 ℃ to obtain a steel pipe;
step S35: cooling the steel pipe to 400 ℃ in air; scraping off burrs after welding of the connecting part 12 by using a scraper, and removing the clamp;
step S36: heating the connecting part 12 of the steel pipe to 900 ℃; cooling to 400 ℃ in rolling air, and straightening the steel pipe by adopting a straightening roller;
step S37: and (5) cooling the water to the normal temperature.
As a second aspect of the present application, a steel pipe is prepared by a steel pipe forming method, wherein the prepared steel pipe is suitable for use as a concrete conveying pipe, has a uniform pipe wall, is not easy to block, and has high hardness, good wear resistance, and good high contact performance.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method of forming a steel pipe, comprising:
heating a steel strip, wherein the steel strip is high-carbon chromium bearing steel;
continuously rolling and rolling the heated steel strip for multiple times to obtain a tube blank, wherein the tube blank comprises: the tube blank comprises a tubular tube blank body and a connecting part, wherein the connecting part is arranged on the tube blank body and extends along the length direction of the tube blank body;
and welding the connecting part to obtain the steel pipe.
2. The method of forming a steel pipe as claimed in claim 1 wherein heating the steel strip comprises:
and heating the steel strip to 600-950 ℃.
3. The method for forming a steel pipe as claimed in claim 1, wherein said rolling the heated steel strip for a plurality of times to produce a pipe blank comprises:
vertically rolling the heated steel strip to obtain a steel strip with a U-shaped section;
carrying out multiple transverse rolling and multiple vertical rolling and rolling on the steel belt with the U-shaped section until the pipe blank with the O-shaped section is manufactured;
wherein the last rolling roll is the transverse rolling roll.
4. The method of claim 1, wherein the welding temperature is 1300 to 1500 ℃ in the process of welding the connection portion to obtain the steel pipe.
5. The steel pipe forming method according to claim 1, wherein the steel strip is a spheroidizing annealed high-carbon chromium bearing steel having a carbon content of not less than 0.6% by mass.
6. The method of forming a steel pipe according to claim 1, wherein after the steel pipe is produced by welding the connection portion, the method further comprises:
and carrying out heat treatment on the steel pipe.
7. The method of forming a steel pipe as claimed in claim 6, wherein said heat treating said steel pipe comprises:
heating the connecting part of the steel pipe to 750-1050 ℃;
and cooling the heated steel pipe to 300-500 ℃ in air, and then cooling the steel pipe to the normal temperature by water.
8. The method for forming a steel pipe according to claim 7, wherein the step of cooling the heated steel pipe to 300 to 500 ℃ in air comprises:
and cooling the heated steel pipe to 300-500 ℃ in air, and straightening the steel pipe by adopting a straightening roller in the cooling process.
9. The method of forming a steel pipe as set forth in claim 1, wherein welding the connection portion to produce a steel pipe comprises:
clamping the tube blank by adopting a clamp, and welding the connecting part to obtain the steel tube;
the clamping force of the clamp is 5-30 Mpa, and the direction of the clamping force is perpendicular to the extending direction of the connecting portion.
10. A steel pipe produced by the method for forming a steel pipe according to any one of claims 1 to 9.
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| CN202110639710.9A CN113333499A (en) | 2021-06-08 | 2021-06-08 | Steel pipe forming method and steel pipe |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5743929A (en) * | 1980-08-29 | 1982-03-12 | Sanyo Tokushu Seikou Kk | Production of pipe of bearing steel |
| CN101020951A (en) * | 2007-02-07 | 2007-08-22 | 钢铁研究总院 | Controlled cooling process and water cooler for high carbon and chromium bearing steel pipe blank after hot rolling |
| KR100832960B1 (en) * | 2006-12-29 | 2008-05-27 | 주식회사 포스코 | The method for manufacturing the high carbon chromium bearing steel |
| CN105478525A (en) * | 2016-01-06 | 2016-04-13 | 河北华通线缆集团股份有限公司 | Production method for coiled tubing internally provided with logging cable |
| CN111876563A (en) * | 2020-08-07 | 2020-11-03 | 江苏联峰实业有限公司 | Rolling process of carbon-chromium bearing steel |
-
2021
- 2021-06-08 CN CN202110639710.9A patent/CN113333499A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5743929A (en) * | 1980-08-29 | 1982-03-12 | Sanyo Tokushu Seikou Kk | Production of pipe of bearing steel |
| KR100832960B1 (en) * | 2006-12-29 | 2008-05-27 | 주식회사 포스코 | The method for manufacturing the high carbon chromium bearing steel |
| CN101020951A (en) * | 2007-02-07 | 2007-08-22 | 钢铁研究总院 | Controlled cooling process and water cooler for high carbon and chromium bearing steel pipe blank after hot rolling |
| CN105478525A (en) * | 2016-01-06 | 2016-04-13 | 河北华通线缆集团股份有限公司 | Production method for coiled tubing internally provided with logging cable |
| CN111876563A (en) * | 2020-08-07 | 2020-11-03 | 江苏联峰实业有限公司 | Rolling process of carbon-chromium bearing steel |
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