CN112718912A - Preparation method of metallurgical composite steel pipe - Google Patents
Preparation method of metallurgical composite steel pipe Download PDFInfo
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- CN112718912A CN112718912A CN202011627432.7A CN202011627432A CN112718912A CN 112718912 A CN112718912 A CN 112718912A CN 202011627432 A CN202011627432 A CN 202011627432A CN 112718912 A CN112718912 A CN 112718912A
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- pipe blank
- composite pipe
- inner coating
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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
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Abstract
The invention provides a preparation method of a metallurgical composite steel pipe, which solves the problems in the prior composite technology and prepares the metallurgical composite steel pipe with the bonding performance obviously superior to that of the prior product. The preparation method comprises the following steps: s1: the base layer is made of seamless steel pipes, and the inner surface of the base layer is treated; s2: the inner coating layer is made of a bar material, and the outer surface of the inner coating layer is processed; s3: pressing the inner coating bar into the base pipe by a press until the bottom end is flush and the inner coating on the top end is higher than the base layer, so that the inner coating bar and the base layer are in interference fit to obtain a mechanical composite pipe blank; s4: sealing and welding two ends of the mechanical composite pipe blank, reserving a vacuumizing interface at the top end and vacuumizing; s5: heating the mechanical composite pipe blank to the lowest rolling temperature of the inner coating material and preserving heat; s6: carrying out mechanical composite pipe blank to a preset diameter through a quick forging machine to obtain a metallurgical composite pipe blank; s7: and (4) forming and processing the forged composite pipe blank to obtain a finished metallurgical composite steel pipe.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of ferrous metallurgy, in particular to a preparation method of a metallurgical composite steel pipe.
[ background of the invention ]
Compared with common corrosion prevention schemes such as corrosion inhibitors, coatings, material upgrading and the like, the bimetal composite pipe is recognized by the petroleum industry to solve the problem of high H content2S、CO2、Cl-And the like, and a high cost-effective method for conveying corrosive media. The bimetal composite pipe comprises a mechanical composite pipe and a metallurgical composite pipe, and compared with the mechanical composite pipe, the metallurgical composite pipe has higher bonding strength, so that the collapse of an inner liner of the mechanical composite pipe is avoidedSink into, bulge scheduling problem, and the welding degree of difficulty is lower, be more easily processed the pipe fitting. The traditional metallurgical composite pipe is mostly produced by adopting processes such as explosive composite plate welded pipe, inner surfacing, centrifugal casting and the like, and has the defects of straight welding seam, non-uniform inner coating, complex process, high production cost and the like.
With increasingly harsh service conditions of pipelines such as oil and gas fields, boiler heat exchange tube bundles and the like, a preparation method of a metallurgical composite steel pipe is needed to be developed so as to overcome the defects of the prior art and meet the urgent demands of the market on metallurgical composite steel pipe products.
[ summary of the invention ]
The invention provides a preparation method of a metallurgical composite steel pipe, which solves the problems in the prior composite technology and prepares the metallurgical composite steel pipe with the bonding performance obviously superior to that of the prior product.
Further, the preparation method comprises the following steps:
s1: the base layer is made of seamless steel pipes, and the inner surface of the base layer is treated;
s2: the inner coating layer is made of a bar material, and the outer surface of the inner coating layer is processed;
s3: pressing the inner coating bar into the base pipe by a press until the bottom end is flush and the inner coating on the top end is higher than the base layer, so that the inner coating bar and the base layer are in interference fit to obtain a mechanical composite pipe blank;
s4: sealing and welding two ends of the mechanical composite pipe blank, reserving a vacuumizing interface at the top end and vacuumizing;
s5: heating the mechanical composite pipe blank to the lowest rolling temperature of the inner coating material and preserving heat;
s6: carrying out mechanical composite pipe blank to a preset diameter through a quick forging machine to obtain a metallurgical composite pipe blank;
s7: and (3) performing forming processing on the forged composite pipe blank by adopting a perforation-cold rolling-heat treatment process to obtain a finished metallurgical composite steel pipe.
Further, the S1 middle-layer seamless steel pipe comprises low-carbon steel, medium-carbon steel and high-carbon steel, and the inner surface is treated to reach the inner surface roughness below 70 μm.
Further, the inner cladding bar material comprises martensite, austenite, dual-phase steel and nickel-based alloy, and the outer surface is processed to reach the roughness of the outer surface below 70 mu m.
Further, the length of the inner coating bar in the S2 is 5-10 mm greater than that of the base steel pipe.
Furthermore, the interference in the S3 is 50-100 mu m.
Further, the heating temperature range in S5 is as follows: the temperature is 1150-1200 ℃, and the heat preservation time is 6-8 h;
further, the S6 rapid forging process makes the base layer and the inner cladding layer reach atomic bonding, and the S6 specifically includes:
s61: forging the heated composite pipe blank to 20-33% of the original diameter by a quick forging machine;
s62: performing ultrasonic flaw detection on the forged composite pipe blank, and performing head cutting treatment on un-compounded areas possibly existing at two ends;
s63: and polishing and coping the outer surface of the forged composite pipe blank, and removing oxide skin on the outer surface to form the metallurgical composite pipe blank.
Further, the number of sealing welding tracks in the S4 sealing welding process is not less than 2.
Further, the vacuum degree in the S4 ranges from 5Pa to 10 Pa.
Further, the piercing-cold rolling-heat treatment process in S7 includes:
s71: heating the metallurgical composite pipe blank and perforating the metallurgical composite pipe blank through a perforating machine to form a perforated pierced billet;
s72: cold rolling the pierced billet, wherein the cold rolling reduction amount is as follows: 10% -20%, wall reduction: 40% -50%, obtaining a formed metallurgical composite steel pipe;
s73: and (3) according to the base layer and the inner coating material, the formed metallurgical composite steel pipe is treated by adopting an annealing, solid solution and quenching and tempering heat treatment system.
Further, the heating temperature range in S71 is as follows: the temperature is 1150-1200 ℃, the heat preservation time of the high-temperature section is 1-1.5 hours, and the furnace staying time is 4-5 hours.
Compared with the prior art, the invention can obtain the following technical effects:
the invention has the advantages that:
1: the problems of bulging, collapse, poor heat transfer and the like of the inner liner layer caused by low bonding strength of the mechanical composite pipe are solved;
2: the problems of stress concentration, microcrack and the like caused by a saw-toothed bonding interface in the traditional explosion metallurgy composite technology and the problem of uneven inner coating caused by a centrifugal casting process are avoided, and meanwhile, the production efficiency and the cost are higher than those of the inner surfacing type metallurgy composite technology.
Of course, it is not necessary for any one product in which the invention is practiced to achieve all of the above-described technical effects simultaneously.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention.
FIG. 1 is a state diagram of an inner clad rod material before being pressed into a base seamless steel pipe according to a preparation method provided by an embodiment of the invention;
FIG. 2 is a state diagram of the inner clad rod material before being pressed into the base seamless steel pipe according to the preparation method provided by the embodiment of the invention;
FIG. 3 is a top view of an apparatus in a manufacturing process provided by one embodiment of the present invention;
FIG. 4 is a microstructure view of a bond interface of a finished metallurgical composite tube according to one embodiment of the present invention.
Wherein, in the figure:
1-base layer seamless steel pipe; 2-inner coating layer bar stock; and 3, pressing by using a press.
[ detailed description ] embodiments
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some 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 given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The invention provides a preparation method of a metallurgical composite steel pipe, which comprises the following steps:
s1: the base layer is made of seamless steel tube, and the material of the seamless steel tube comprises low carbon steel, medium carbon steel or high carbon steel. Carrying out inner surface treatment on the base layer to enable the roughness of the inner surface to be below 70 mu m;
s2: the inner coating layer is made of a bar material which comprises martensite, austenite, dual-phase steel or nickel-based alloy and other corrosion-resistant alloys. Performing outer surface treatment on the inner coating layer to enable the roughness of the outer surface to be less than 70 mu m, as shown in figure 1;
s3: the inner coating bar is pressed into the base pipe through a press machine until the bottom end is flush, and as shown in figure 2, the inner coating on the top end is slightly higher than the base layer by about 5-10 mm. The two are in interference fit, and the interference magnitude is 50-100 mu m, so that a mechanical composite pipe blank is obtained;
s4: performing sealing welding treatment on two ends of the mechanical composite pipe blank, wherein the number of sealing welding channels is not less than 2, reserving a vacuumizing interface at the top end of the mechanical composite pipe blank, and performing vacuumizing treatment, wherein the vacuum degree reaches 5-10 Pa, as shown in figure 3;
s5: heating the mechanical composite pipe blank to the lowest rolling temperature of the material of the inner coating, wherein the temperature range is as follows: 1150-1200 ℃ and keeping the temperature for 6-8 hours;
s6: forging and pressing the mechanical composite pipe blank to a preset diameter through a quick forging machine to enable the base layer and the inner coating layer to reach an interlayer atomic bonding state, and obtaining a metallurgical composite pipe blank; the quick forging method specifically comprises the following steps:
1) forging the heated composite pipe blank to 20-33% of the original diameter by a quick forging machine;
2) performing ultrasonic flaw detection on the forged composite pipe blank, and performing head cutting treatment on un-compounded areas possibly existing at two ends;
3) polishing and grinding the outer surface of the forged composite pipe blank, and removing oxide skin on the outer surface to form a metallurgical composite pipe blank;
s7: the method comprises the following steps of performing forming processing on the forged composite pipe blank by adopting a perforation-cold rolling-heat treatment process to obtain a finished metallurgical composite steel pipe, and specifically comprises the following steps:
1) heating the metallurgical composite pipe blank, wherein the heating temperature range is as follows: the temperature is kept at 1150-1200 ℃ for 1-1.5 hours in a high-temperature section, the furnace holding time is 4-5 hours, and the piercing is carried out through a piercing machine to form a pierced billet;
2) cold rolling the pierced billet, wherein the cold rolling reduction amount is as follows: 10% -20%, wall reduction: 40% -50%, and obtaining the formed metallurgical composite steel pipe.
3) According to the material of the base layer and the inner coating layer, the formed metallurgical composite steel pipe is treated by adopting different heat treatment systems such as annealing, solid solution, quenching and tempering.
Example 1:
as shown in FIG. 4, the preparation process of the invention comprises the following steps:
1, the base layer is a 30CrMoA seamless steel pipe with the specification of phi 600 x 200 x 1000mm, and the inner surface is turned or ground to the roughness below 70 mu m.
2, selecting an N08825 bar stock as a coating layer, turning the outer surface to phi 200 with specification phi 202 x 1005, and ensuring that the amount of is 50-100 mu m;
3, pressing an N08825 bar into the 30CrMoA seamless steel pipe by adopting a 10000-ton press until the bottom end is flush and the top end is slightly higher than about 5 mm;
4, sealing and welding two ends, reserving a vacuumizing interface at the top end, and keeping the vacuum degree at 5 Pa;
5, heating to 1180 ℃, and keeping the temperature for 6 hours;
6, the operation of the quick forging machine is divided into two times, the first forging is carried out until phi 450 is 1778mm, then the second forging is carried out by heating to 1180 ℃ again, and the second forging is carried out until phi 273 is 4800 mm. Cutting ends of two ends possibly with non-composite areas after ultrasonic flaw detection, polishing and grinding the surfaces to obtain a phi 273 x 4500 metallurgical composite pipe blank, and sawing the metallurgical composite pipe blank into two phi 273 x 2250 metallurgical composite pipe blanks;
7, heating by adopting an inclined bottom furnace, wherein the heating temperature is 1180 ℃, the standing time is 4 hours, and the heat preservation time at a high temperature section is 1 hour; perforating by 720-strain perforating machine to obtain perforated pierced pipes with phi 320 x 18 x 7000.
8, cold rolling by using a cold pilger mill to obtain a phi 273 x 12.7 x 10200 shaped metallurgical composite steel pipe, wherein the cold rolling reduction is 47mm, and the wall reduction is 5.3 mm;
and 9, performing water quenching after heat preservation for 25 minutes at 910 ℃, and then performing air cooling tempering treatment after heat preservation for 45 minutes at 610 ℃.
And 10, straightening the metallurgical composite steel pipe subjected to heat treatment and polishing a 120-mesh thousand-impeller inner wall to obtain a finished metallurgical composite steel pipe.
As shown in fig. 4, in the microstructure diagram of the bonding interface of the finished metallurgical composite pipe of the invention, in the transition process from N08825 to 30CrMoA carbon steel, the contents of elements such as chromium, nickel, molybdenum and the like are reduced, and the content of iron is increased. The diffusion of elements such as chromium, nickel, molybdenum and the like can be obviously seen in the N08825 alloy, and the diffusion distance is about 40 mu m.
The preparation method of the metallurgical composite steel pipe provided by the embodiment of the application is described in detail above. The above description of the embodiments is only for the purpose of helping to understand the method of the present application and its core ideas; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
As used in the specification and claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect. The description which follows is a preferred embodiment of the present application, but is made for the purpose of illustrating the general principles of the application and not for the purpose of limiting the scope of the application. The protection scope of the present application shall be subject to the definitions of the appended claims.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a commodity or system that includes the element.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The foregoing description shows and describes several preferred embodiments of the present application, but as aforementioned, it is to be understood that the application is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the application as described herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the application, which is to be protected by the claims appended hereto.
Claims (10)
1. The preparation method of the metallurgical composite steel pipe is characterized by comprising the following steps:
s1: the base layer is made of seamless steel pipes, and the inner surface of the base layer is treated;
s2: the inner coating layer is made of a bar material, and the outer surface of the inner coating layer is processed;
s3: pressing the inner coating bar into the base pipe by a press until the bottom end is flush and the inner coating on the top end is higher than the base layer, so that the inner coating bar and the base layer are in interference fit to obtain a mechanical composite pipe blank;
s4: sealing and welding two ends of the mechanical composite pipe blank, reserving a vacuumizing interface at the top end and vacuumizing;
s5: heating the mechanical composite pipe blank to the lowest rolling temperature of the inner coating material and preserving heat;
s6: carrying out mechanical composite pipe blank to a preset diameter through a quick forging machine to obtain a metallurgical composite pipe blank;
s7: and (3) performing forming processing on the metallurgical composite pipe blank by adopting a perforation-cold rolling-heat treatment process to obtain a finished product metallurgical composite steel pipe.
2. The method according to claim 1, wherein the seamless steel pipe as the substrate in S1 comprises low carbon steel, medium carbon steel and high carbon steel, and is internally surface-treated to have an internal surface roughness of 70 μm or less.
3. The method of claim 1, wherein the inner clad bar stock comprises martensite, austenite, dual phase steel, and nickel based alloy, and the outer surface is treated to have an outer surface roughness of less than 70 μm.
4. The preparation method of claim 1, wherein the length of the inner coating bar in the S2 is 5-10 mm greater than that of the base steel pipe.
5. The method according to claim 1, wherein the interference in S3 is 50-100 μm.
6. The method according to claim 1, wherein the heating temperature in S5 is in the range of: 1150-1200 ℃ and the heat preservation time is 6-8 h.
7. The method according to claim 1, wherein the S6 rapid forging process atomically bonds the base layer and the inner cladding layer, and the S6 specifically comprises:
s61: forging the heated composite pipe blank to 20-33% of the original diameter by a quick forging machine;
s62: performing ultrasonic flaw detection on the forged composite pipe blank, and performing head cutting treatment on un-compounded areas possibly existing at two ends;
s63: and polishing and coping the outer surface of the forged composite pipe blank, and removing oxide skin on the outer surface to form the metallurgical composite pipe blank.
8. The preparation method according to claim 1, wherein the number of sealing passes in the S4 sealing treatment is not less than 2, and the vacuum degree is 5-10 Pa.
9. The method for preparing the alloy steel sheet according to claim 1, wherein the punching-cold rolling-heat treatment process in the step S7 is specifically as follows:
s71: heating the metallurgical composite pipe blank and perforating the metallurgical composite pipe blank through a perforating machine to form a perforated pierced billet;
s72: cold rolling the pierced billet, wherein the cold rolling reduction amount is as follows: 10% -20%, wall reduction: 40% -50%, obtaining a formed metallurgical composite steel pipe;
s73: and (3) according to the base layer and the inner coating material, the formed metallurgical composite steel pipe is treated by adopting an annealing, solid solution and quenching and tempering heat treatment system.
10. The method according to claim 9, wherein the heating temperature in S71 is in the range of: the temperature is 1150-1200 ℃, the heat preservation time of the high-temperature section is 1-1.5 hours, and the furnace staying time is 4-5 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011627432.7A CN112718912A (en) | 2020-12-30 | 2020-12-30 | Preparation method of metallurgical composite steel pipe |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011627432.7A CN112718912A (en) | 2020-12-30 | 2020-12-30 | Preparation method of metallurgical composite steel pipe |
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| CN112718912A true CN112718912A (en) | 2021-04-30 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113477712A (en) * | 2021-07-30 | 2021-10-08 | 安徽工业大学 | Preparation process of multilayer metal composite belt |
| CN116329317A (en) * | 2023-05-11 | 2023-06-27 | 太原科技大学 | Bimetal composite seamless pipe and rolling process flow |
-
2020
- 2020-12-30 CN CN202011627432.7A patent/CN112718912A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113477712A (en) * | 2021-07-30 | 2021-10-08 | 安徽工业大学 | Preparation process of multilayer metal composite belt |
| CN113477712B (en) * | 2021-07-30 | 2023-12-05 | 安徽工业大学 | Preparation process of multilayer metal composite belt |
| CN116329317A (en) * | 2023-05-11 | 2023-06-27 | 太原科技大学 | Bimetal composite seamless pipe and rolling process flow |
| CN116329317B (en) * | 2023-05-11 | 2023-07-21 | 太原科技大学 | Bimetal composite seamless pipe and rolling process |
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