CN114043176A - Method for manufacturing large-caliber magnesium and magnesium alloy seamless pipe - Google Patents
Method for manufacturing large-caliber magnesium and magnesium alloy seamless pipe Download PDFInfo
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- CN114043176A CN114043176A CN202111446266.5A CN202111446266A CN114043176A CN 114043176 A CN114043176 A CN 114043176A CN 202111446266 A CN202111446266 A CN 202111446266A CN 114043176 A CN114043176 A CN 114043176A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention relates to a method for manufacturing a large-caliber magnesium and magnesium alloy seamless pipe, which adopts the processes of casting a casting rod, normalizing treatment, primary perforation, secondary perforation, reducing treatment, surface treatment, pipe blank rolling, post-rolling treatment and the like to manufacture the large-caliber magnesium and magnesium alloy seamless pipe, has good tissue uniformity, is favorable for ensuring the comprehensive performance of products, and has the advantages of high product precision, high material utilization rate, flexibility, convenience, stable product quality, lower production cost and high production efficiency.
Description
Technical Field
The invention relates to the technical field of metal products, in particular to a method for manufacturing a large-caliber magnesium and magnesium alloy seamless pipe.
Background
Magnesium and magnesium alloy are used as metal materials with low density and high specific strength, and can be used in industries such as petroleum pipelines, submarine pipelines, petrochemicals, automobile industry, electronic industry and the like. The processing method of the magnesium and magnesium alloy large-caliber thick-wall seamless tube blank comprises three methods: one is to use magnesium and magnesium alloy plate, through the plate bending machine or compression molding of the oil press, then weld into the round tube, through the round correction, straighten, make into the tube blank with seam; the second main method is to adopt magnesium and magnesium alloy to manufacture seamless tube blanks through processes of extrusion and the like; and the third is to manufacture a seamless tube blank by one-time cross piercing and two-time cross piercing. At present, large-caliber magnesium and magnesium alloy pipe blanks manufactured at home and abroad are mainly produced by adopting a first method and a second method, and for a third method, the prior process is still immature, the production cost is high, particularly for the production of large-caliber magnesium and magnesium alloy pipe blanks, the dimensional precision cannot be ensured, the product quality stability is poor, and the production efficiency is low.
Disclosure of Invention
The invention aims to provide a method for manufacturing a large-caliber magnesium and magnesium alloy seamless pipe, which aims to solve the problems in the background technology.
The purpose of the invention can be realized by the following technical scheme:
a method for manufacturing a large-caliber magnesium and magnesium alloy seamless pipe comprises the following steps:
s1, casting a cast rod: under the protection of gas and flux, adding grain refiner to magnesium and magnesium alloy, refining melt, and casting to produce bar blank;
s2, normalizing: normalizing the bar blank prepared in the step S1 in a low-temperature heating furnace at the temperature of 350-400 ℃ for 6-8 hours to prepare a bar;
s3, primary perforation: heating the bar prepared in the step S2 in a low-temperature electric furnace at 490-530 ℃ for 1-3 hours; then a three-roller cross rolling piercing mill is used for manufacturing a magnesium and magnesium alloy primary piercing tube blank; finally, reducing the rotating speed of the three-roller cross rolling piercing mill, wherein the rotating speed is controlled to be 25-35 revolutions per minute;
s4, secondary perforation: the primary punched pipe blank prepared in the step S3 is placed in a low-temperature electric furnace for heating after the inner and outer surfaces are treated, the temperature is 460-510 ℃, the temperature is kept for 30-60 minutes, and a three-roller skew rolling puncher is used for preparing a magnesium and magnesium alloy secondary punched pipe blank;
s5, reducing: conveying the secondary punched pipe blank into a sizing and reducing machine for sizing and reducing by utilizing the residual temperature of the secondary punched pipe blank to obtain a magnesium and magnesium alloy pipe blank with a preset specification;
s6, surface treatment: treating the inner surface and the outer surface of the magnesium and magnesium alloy tube blank prepared in the step S5, wherein the single side is 0.2-0.4mm, so as to remove a surface air suction layer and surface defects;
s7, rolling the tube blank: rolling the pipe blank prepared in the step S6 by using a pipe rolling mill, carrying out induction on-line heating on the pipe blank at a feed inlet of the pipe rolling mill, wherein the heating temperature is 250-350 ℃, the feeding amount during rolling is controlled to be 2-3mm, the number of times of a rack is controlled to be 30-40 times/min, and a pipe with a corresponding specification is obtained after rolling;
s8, rolling post-treatment: performing oil removal treatment and recrystallization annealing treatment on the pipe prepared in the step S7 to obtain a finished pipe; and then the large-caliber magnesium and magnesium alloy seamless pipe is prepared by straightening with temperature, deburring and polishing or machining, head and tail cutting, sizing and water pressure testing.
Preferably, in the step of casting the cast rod by fusion at S1, the grain refiner is an Al — Zr — C grain refiner.
Preferably, in the step of S3 one-time perforation, the low-temperature electric furnace is a low-temperature box-type resistance furnace, the lightweight high-alumina bricks are used as refractory materials, the rock wool board is used for heat preservation, and the resistance wire or the silicon carbide rod is used as a heating element.
Preferably, in the S7 tube blank rolling step, the rolling heating temperature is 280-300 ℃.
The invention has the beneficial effects that:
the invention relates to a method for manufacturing large-caliber magnesium and magnesium alloy seamless pipes, which adopts the processes of casting a casting rod, normalizing treatment, primary perforation, secondary perforation, reducing treatment, surface treatment, pipe blank rolling, post-rolling treatment and the like to manufacture large-caliber magnesium and magnesium alloy seamless pipes.
Detailed Description
To facilitate understanding of those skilled in the art, the present invention will be further described with reference to specific examples.
Example 1:
a method for manufacturing a large-caliber magnesium and magnesium alloy seamless pipe comprises the following steps:
s1, casting a cast rod: under the protection of gas and flux, adding grain refiner to magnesium and magnesium alloy, carrying out melt refining, and casting to produce a bar billet, wherein the grain refiner is Al-Zr-C grain refiner.
S2, normalizing: and (4) normalizing the bar blank prepared in the step S1 in a low-temperature heating furnace at the treatment temperature of 350 ℃ for 8 hours to prepare the bar.
S3, primary perforation: heating the bar prepared in the step S2 in a low-temperature electric furnace at 530 ℃ for 1 hour; then a three-roller cross rolling piercing mill is used for manufacturing a magnesium and magnesium alloy primary piercing tube blank; finally, reducing the rotating speed of the three-roller cross rolling piercing mill, wherein the rotating speed is controlled to be 25-35 revolutions per minute; the low-temperature electric furnace is a low-temperature box type resistance furnace, light high-alumina bricks are used as refractory materials, rock wool boards are used for heat preservation, and resistance wires or silicon carbide rods are used as heating elements.
S4, secondary perforation: and (3) treating the inner surface and the outer surface of the primary punched pipe blank prepared in the step S3, heating the primary punched pipe blank in a low-temperature electric furnace at 480 ℃, preserving the heat for 40 minutes, and manufacturing a secondary punched pipe blank of magnesium and magnesium alloy by using a three-roller cross rolling puncher.
S5, reducing: and (4) conveying the secondary punched pipe blank into a sizing and reducing machine for sizing and reducing by utilizing the residual temperature of the secondary punched pipe blank to obtain the magnesium and magnesium alloy pipe blank with the preset specification.
S6, surface treatment: and (3) treating the inner surface and the outer surface of the magnesium and magnesium alloy pipe blank prepared in the step S5, wherein the single side is 0.2-0.4mm, so as to remove a surface air suction layer and surface defects.
S7, rolling the tube blank: and (3) rolling the pipe blank prepared in the step S6 by using a pipe mill, carrying out induction on-line heating on the pipe blank at a feed inlet of the pipe mill, controlling the feeding amount to be 2-3mm during rolling and controlling the number of times of a rack to be 30-40 times/minute, and obtaining a pipe material with a corresponding specification after rolling.
S8, rolling post-treatment: performing oil removal treatment and recrystallization annealing treatment on the pipe prepared in the step S7 to obtain a finished pipe; and then the large-caliber magnesium and magnesium alloy seamless pipe is prepared by straightening with temperature, deburring and polishing or machining, head and tail cutting, sizing and water pressure testing.
Example 2:
a method for manufacturing a large-caliber magnesium and magnesium alloy seamless pipe comprises the following steps:
s1, casting a cast rod: under the protection of gas and flux, adding grain refiner to magnesium and magnesium alloy, carrying out melt refining, and casting to produce a bar billet, wherein the grain refiner is Al-Zr-C grain refiner.
S2, normalizing: and (4) normalizing the bar blank prepared in the step S1 in a low-temperature heating furnace at the treatment temperature of 400 ℃ for 6 hours to prepare the bar.
S3, primary perforation: heating the bar prepared in the step S2 in a low-temperature electric furnace at 490 ℃ and keeping the temperature for 3 hours; then a three-roller cross rolling piercing mill is used for manufacturing a magnesium and magnesium alloy primary piercing tube blank; finally, reducing the rotating speed of the three-roller cross rolling piercing mill, wherein the rotating speed is controlled to be 25-35 revolutions per minute; the low-temperature electric furnace is a low-temperature box type resistance furnace, light high-alumina bricks are used as refractory materials, rock wool boards are used for heat preservation, and resistance wires or silicon carbide rods are used as heating elements.
S4, secondary perforation: and (3) treating the inner surface and the outer surface of the primary perforated pipe blank prepared in the step S3, heating the pipe blank in a low-temperature electric furnace at 460 ℃, preserving the heat for 60 minutes, and preparing the secondary perforated pipe blank of magnesium and magnesium alloy by using a three-roller cross rolling puncher.
S5, reducing: and (4) conveying the secondary punched pipe blank into a sizing and reducing machine for sizing and reducing by utilizing the residual temperature of the secondary punched pipe blank to obtain the magnesium and magnesium alloy pipe blank with the preset specification.
S6, surface treatment: and (3) treating the inner surface and the outer surface of the magnesium and magnesium alloy pipe blank prepared in the step S5, wherein the single side is 0.2-0.4mm, so as to remove a surface air suction layer and surface defects.
S7, rolling the tube blank: and (3) rolling the pipe blank prepared in the step S6 by using a pipe mill, carrying out induction on-line heating on the pipe blank at a feed inlet of the pipe mill, wherein the heating temperature is 350 ℃, the feeding amount during rolling is controlled to be 2-3mm, the number of times of a rack is controlled to be 30-40 times/min, and obtaining a pipe material with a corresponding specification after rolling.
S8, rolling post-treatment: performing oil removal treatment and recrystallization annealing treatment on the pipe prepared in the step S7 to obtain a finished pipe; and then the large-caliber magnesium and magnesium alloy seamless pipe is prepared by straightening with temperature, deburring and polishing or machining, head and tail cutting, sizing and water pressure testing.
Example 3:
a method for manufacturing a large-caliber magnesium and magnesium alloy seamless pipe comprises the following steps:
s1, casting a cast rod: under the protection of gas and flux, adding grain refiner to magnesium and magnesium alloy, carrying out melt refining, and casting to produce a bar billet, wherein the grain refiner is Al-Zr-C grain refiner.
S2, normalizing: and (4) normalizing the bar blank prepared in the step S1 in a low-temperature heating furnace at 370 ℃, and preserving the heat for 7 hours to prepare the bar.
S3, primary perforation: heating the bar prepared in the step S2 in a low-temperature electric furnace at 510 ℃ for 2 hours; then a three-roller cross rolling piercing mill is used for manufacturing a magnesium and magnesium alloy primary piercing tube blank; finally, reducing the rotating speed of the three-roller cross rolling piercing mill, wherein the rotating speed is controlled to be 25-35 revolutions per minute; the low-temperature electric furnace is a low-temperature box type resistance furnace, light high-alumina bricks are used as refractory materials, rock wool boards are used for heat preservation, and resistance wires or silicon carbide rods are used as heating elements.
S4, secondary perforation: and (3) treating the inner surface and the outer surface of the primary perforated pipe blank prepared in the step S3, heating the pipe blank in a low-temperature electric furnace at 510 ℃, preserving the heat for 30 minutes, and preparing the secondary perforated pipe blank of magnesium and magnesium alloy by using a three-roller cross rolling puncher.
S5, reducing: and (4) conveying the secondary punched pipe blank into a sizing and reducing machine for sizing and reducing by utilizing the residual temperature of the secondary punched pipe blank to obtain the magnesium and magnesium alloy pipe blank with the preset specification.
S6, surface treatment: and (3) treating the inner surface and the outer surface of the magnesium and magnesium alloy pipe blank prepared in the step S5, wherein the single side is 0.2-0.4mm, so as to remove a surface air suction layer and surface defects.
S7, rolling the tube blank: and (3) rolling the pipe blank prepared in the step S6 by using a pipe mill, carrying out induction on-line heating on the pipe blank at a feed inlet of the pipe mill, controlling the feeding amount to be 2-3mm during rolling at the heating temperature of 280 ℃, controlling the number of times of a rack to be 30-40 times/minute, and obtaining a pipe material with a corresponding specification after rolling.
S8, rolling post-treatment: performing oil removal treatment and recrystallization annealing treatment on the pipe prepared in the step S7 to obtain a finished pipe; and then the large-caliber magnesium and magnesium alloy seamless pipe is prepared by straightening with temperature, deburring and polishing or machining, head and tail cutting, sizing and water pressure testing.
Example 4:
a method for manufacturing a large-caliber magnesium and magnesium alloy seamless pipe comprises the following steps:
s1, casting a cast rod: under the protection of gas and flux, adding grain refiner to magnesium and magnesium alloy, carrying out melt refining, and casting to produce a bar billet, wherein the grain refiner is Al-Zr-C grain refiner.
S2, normalizing: and (5) normalizing the bar blank prepared in the step S1 in a low-temperature heating furnace at the treatment temperature of 380 ℃ for 7 hours to prepare the bar.
S3, primary perforation: heating the bar prepared in the step S2 in a low-temperature electric furnace at 500 ℃ for 2.5 hours; then a three-roller cross rolling piercing mill is used for manufacturing a magnesium and magnesium alloy primary piercing tube blank; finally, reducing the rotating speed of the three-roller cross rolling piercing mill, wherein the rotating speed is controlled to be 25-35 revolutions per minute; the low-temperature electric furnace is a low-temperature box type resistance furnace, light high-alumina bricks are used as refractory materials, rock wool boards are used for heat preservation, and resistance wires or silicon carbide rods are used as heating elements.
S4, secondary perforation: and (3) treating the inner surface and the outer surface of the primary punched pipe blank prepared in the step S3, heating the primary punched pipe blank in a low-temperature electric furnace at the temperature of 500 ℃, preserving the heat for 40 minutes, and manufacturing a secondary punched pipe blank of magnesium and magnesium alloy by using a three-roller cross rolling puncher.
S5, reducing: and (4) conveying the secondary punched pipe blank into a sizing and reducing machine for sizing and reducing by utilizing the residual temperature of the secondary punched pipe blank to obtain the magnesium and magnesium alloy pipe blank with the preset specification.
S6, surface treatment: and (3) treating the inner surface and the outer surface of the magnesium and magnesium alloy pipe blank prepared in the step S5, wherein the single side is 0.2-0.4mm, so as to remove a surface air suction layer and surface defects.
S7, rolling the tube blank: and (3) rolling the pipe blank prepared in the step S6 by using a pipe mill, carrying out induction on-line heating on the pipe blank at a feed inlet of the pipe mill, controlling the feeding amount to be 2-3mm during rolling and controlling the number of times of a rack to be 30-40 times/minute, and obtaining a pipe material with a corresponding specification after rolling.
S8, rolling post-treatment: performing oil removal treatment and recrystallization annealing treatment on the pipe prepared in the step S7 to obtain a finished pipe; and then the large-caliber magnesium and magnesium alloy seamless pipe is prepared by straightening with temperature, deburring and polishing or machining, head and tail cutting, sizing and water pressure testing.
The embodiment proves that the large-caliber magnesium and magnesium alloy seamless pipe prepared by the manufacturing method of the large-caliber magnesium and magnesium alloy seamless pipe has excellent comprehensive performance and reliable quality.
The invention relates to a method for manufacturing large-caliber magnesium and magnesium alloy seamless pipes, which adopts the processes of casting a casting rod, normalizing treatment, primary perforation, secondary perforation, reducing treatment, surface treatment, pipe blank rolling, post-rolling treatment and the like to manufacture large-caliber magnesium and magnesium alloy seamless pipes.
The foregoing is merely exemplary and illustrative of the present invention and various modifications, additions and substitutions may be made by those skilled in the art to the specific embodiments described without departing from the scope of the invention as defined in the following claims.
Claims (4)
1. The method for manufacturing the large-caliber magnesium and magnesium alloy seamless pipe is characterized by comprising the following steps of:
s1, casting a cast rod: under the protection of gas and flux, adding grain refiner to magnesium and magnesium alloy, refining melt, and casting to produce bar blank;
s2, normalizing: normalizing the bar blank prepared in the step S1 in a low-temperature heating furnace at the temperature of 350-400 ℃ for 6-8 hours to prepare a bar;
s3, primary perforation: heating the bar prepared in the step S2 in a low-temperature electric furnace at 490-530 ℃ for 1-3 hours; then a three-roller cross rolling piercing mill is used for manufacturing a magnesium and magnesium alloy primary piercing tube blank; finally, reducing the rotating speed of the three-roller cross rolling piercing mill, wherein the rotating speed is controlled to be 25-35 revolutions per minute;
s4, secondary perforation: the primary punched pipe blank prepared in the step S3 is placed in a low-temperature electric furnace for heating after the inner and outer surfaces are treated, the temperature is 460-510 ℃, the temperature is kept for 30-60 minutes, and a three-roller skew rolling puncher is used for preparing a magnesium and magnesium alloy secondary punched pipe blank;
s5, reducing: conveying the secondary punched pipe blank into a sizing and reducing machine for sizing and reducing by utilizing the residual temperature of the secondary punched pipe blank to obtain a magnesium and magnesium alloy pipe blank with a preset specification;
s6, surface treatment: treating the inner surface and the outer surface of the magnesium and magnesium alloy tube blank prepared in the step S5, wherein the single side is 0.2-0.4mm, so as to remove a surface air suction layer and surface defects;
s7, rolling the tube blank: rolling the pipe blank prepared in the step S6 by using a pipe rolling mill, carrying out induction on-line heating on the pipe blank at a feed inlet of the pipe rolling mill, wherein the heating temperature is 250-350 ℃, the feeding amount during rolling is controlled to be 2-3mm, the number of times of a rack is controlled to be 30-40 times/min, and a pipe with a corresponding specification is obtained after rolling;
s8, rolling post-treatment: performing oil removal treatment and recrystallization annealing treatment on the pipe prepared in the step S7 to obtain a finished pipe; and then the large-caliber magnesium and magnesium alloy seamless pipe is prepared by straightening with temperature, deburring and polishing or machining, head and tail cutting, sizing and water pressure testing.
2. The method for manufacturing large-caliber magnesium and magnesium alloy seamless pipes as claimed in claim 1, wherein in the step of casting the cast rod by S1, the grain refiner is Al-Zr-C grain refiner.
3. The method for manufacturing the large-caliber magnesium and magnesium alloy seamless pipe as claimed in claim 1, wherein in the step of S3 one-time perforation, the low-temperature electric furnace is a low-temperature box type resistance furnace, light high-alumina bricks are used as refractory materials, rock wool boards are used for heat preservation, and resistance wires or silicon carbide rods are used as heating elements.
4. The method for manufacturing large-caliber magnesium and magnesium alloy seamless pipes as claimed in claim 1, wherein in the step of S7 rolling the tube blank, the rolling heating temperature is 280-300 ℃.
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| CN202111446266.5A CN114043176A (en) | 2021-11-30 | 2021-11-30 | Method for manufacturing large-caliber magnesium and magnesium alloy seamless pipe |
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| CN202111446266.5A CN114043176A (en) | 2021-11-30 | 2021-11-30 | Method for manufacturing large-caliber magnesium and magnesium alloy seamless pipe |
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| CN112718910A (en) * | 2020-12-08 | 2021-04-30 | 安徽宝泰特种材料有限公司 | Manufacturing method of large-caliber TC4 titanium alloy thick-wall pipe |
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2021
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2817261A1 (en) * | 1977-05-09 | 1978-11-23 | Alusuisse | Aluminium-silicon-magnesium alloy - for prodn. of seamless tubes |
| WO1996036742A1 (en) * | 1995-05-15 | 1996-11-21 | Sumitomo Metal Industries, Ltd. | Process for producing high-strength seamless steel pipe having excellent sulfide stress cracking resistance |
| JP2000140910A (en) * | 1998-11-04 | 2000-05-23 | Nkk Corp | Manufacture of seamless pipe and device therefor |
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