CN113305166A - Diameter-expanding hot extrusion process for bimetal alloy steel composite pipe - Google Patents

Diameter-expanding hot extrusion process for bimetal alloy steel composite pipe Download PDF

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CN113305166A
CN113305166A CN202110385729.5A CN202110385729A CN113305166A CN 113305166 A CN113305166 A CN 113305166A CN 202110385729 A CN202110385729 A CN 202110385729A CN 113305166 A CN113305166 A CN 113305166A
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extrusion
bimetal
temperature
inner layer
tube blank
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CN113305166B (en
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秦芳诚
李义兵
亓海全
刘崇宇
黄宏锋
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Guilin University of Technology
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Guilin University of Technology
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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
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/22—Making metal-coated products; Making products from two or more metals
    • 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
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/005—Continuous extrusion starting from solid state material
    • 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
    • B21C29/00—Cooling or heating work or parts of the extrusion press; Gas treatment of work
    • B21C29/003—Cooling or heating of work

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Extrusion Of Metal (AREA)

Abstract

A diameter-expanding hot extrusion process for a bimetal alloy steel composite pipe belongs to the technical field of seamless steel pipe forming, and is characterized by comprising the following process steps: 1) normalizing the bimetal as-cast tube blank; 2) expanding and hot extruding the bimetal cast-state tube blank: the extrusion temperature is determined by the inner surface temperature of the inner layer of the tube blank, the extrusion ratio is determined by the wall thickness ratio of the inner layer and the outer layer of the tube blank, and the extrusion speed is determined by the length of the pipe fitting; 3) and (3) quenching and tempering the hot extrusion composite pipe fitting. The invention has the advantages of improving the capability of coordinating plastic deformation of the inner layer and the outer layer, improving the bonding strength of the bonding interface of the inner layer and the outer layer and obtaining the composite pipe fitting with the increased caliber after hot extrusion.

Description

Diameter-expanding hot extrusion process for bimetal alloy steel composite pipe
Technical Field
The invention belongs to the technical field of seamless steel pipe forming, and particularly relates to a diameter-expanding hot extrusion process for a bimetal alloy steel composite pipe.
Background
The bimetal alloy steel seamless pipe is a pipe compounded by two different metals, can exert respective performance characteristics, such as high strength, high toughness, wear resistance, corrosion resistance and the like, is a key component in the field of major equipment such as petrochemical industry, nuclear power and thermal power, transportation and the like, is generally manufactured by adopting a hot extrusion process at present, a pipe blank before hot extrusion can be in two tissue states of a forging state and a casting state, when the two pipe blanks before extrusion are in the forging state, the pipe blank is manufactured through the working procedures of upsetting, punching and the like, the tissue compactness is higher, the two pipe blanks in the forging state are embedded and assembled and then extruded to form a composite pipe fitting, the extrusion process mainly ensures the appearance size of the pipe fitting, the process parameter is relatively easy to control, but the process flow is long, the material and energy waste is serious, and the investment of equipment for the upsetting and punching working procedures is huge; when the two pipe blanks before extrusion are in an as-cast state, the hollow as-cast state pipe blanks are respectively manufactured by a centrifugal casting or sand casting method, the tissue compactness is poor, the two as-cast state pipe blanks are embedded and assembled and then extruded into a composite pipe fitting, the extrusion process not only ensures the overall dimension of the pipe fitting, but also more importantly improves the tissue uniformity and the mechanical property, and the process has the outstanding advantages of short manufacturing flow, material and energy conservation, equipment investment conservation and the like.
The Chinese patent application number '201010141598.8' discloses a 20/321H corrosion-resistant bimetal composite pipe and a manufacturing process thereof, and the manufacturing process comprises the following process steps: 1) centrifugally casting to obtain a bimetal composite pipe blank, starting to cast the metal liquid of the 321H inner stainless steel when the temperature of the inner surface of the outer layer 20 steel is cooled to 50-80 ℃ of the melting point of the metal liquid of the outer layer, 2) carrying out hot extrusion on the bimetal composite pipe blank to obtain a pierced billet, 3) carrying out softening treatment on the pierced billet, carrying out cold machining on the pierced billet, and carrying out heat treatment to obtain a finished pipe; the inner layer and the outer layer of the invention are completely metallurgically fused, and are not easy to delaminate in the using process. The Chinese patent application No. 200910222747.0 discloses a method for preparing a bimetallic seamless steel tube for an alkali recovery boiler, which comprises the following process steps: 1) selecting a metallurgically combined bimetallic centrifugal casting composite pipe blank, carrying out primary annealing treatment at the temperature of 1000-1100 ℃, keeping the temperature for 20-30h, 2) extruding the blank at the temperature of 1180-1220 ℃ before extrusion, under the condition that the extrusion ratio is more than 10, 3) carrying out secondary annealing treatment at the temperature of 780-800 ℃, keeping the temperature for 2-3h, and then carrying out air cooling; the outer layer metal of the composite pipe prepared by the method is resistant to alkali corrosion, the inner layer is resistant to high pressure, and the two layers of metal cannot be layered after being flattened and bent.
When the method is adopted to manufacture the bimetal alloy steel pipe, shear friction exists at the contact part of the extrusion cylinder and the pipe blank in the hot extrusion forming process, the performance of the inner-layer and outer-layer combined interface is weak, metal deformation is severe, and the segregation of coarse oxide particles or alloy elements can cause the damage of tissues, so that the interface bonding strength performance is reduced, the extrusion ratio and the extrusion speed in the hot extrusion process are often determined according to experience, the process parameters have important influences on the coordinated plastic deformation capacity of the inner layer and the outer layer of the pipe blank and the performance quality of the pipe after hot extrusion, and the prior art cannot meet the requirement of high-performance accurate manufacturing of the diameter-expanding hot extrusion of the bimetal composite pipe.
Disclosure of Invention
The invention aims to provide a diameter-expanding hot extrusion process for a bimetal alloy steel composite pipe, which can effectively overcome the defects in the prior art.
The invention is realized in such a way, and is characterized by comprising the following process steps:
(1) normalizing the bimetal as-cast tube blank: the normalizing temperature is 880-900 ℃, and the preset heat preservation time t is reached1Then air-cooled to room temperature by a blower t1From the outer wall thickness b of the tube blank01And inner layer wall thickness b02Determination of t1＝(2.2～2.8)×(b01+b02)，t1Unit is min, b01And b02The unit is mm;
(2) expanding and hot extruding the bimetal cast-state tube blank: as shown in fig. 2, 3 is an outer layer of the bimetal pipe forging, 4 is an inner layer of the bimetal pipe forging, 5 is an extrusion rod, 6 is an extrusion cylinder, 7 is an extrusion convex die, the extrusion temperature T is determined by the inner surface temperature of the inner layer of the pipe blank, the extrusion is started when the temperature T is 1180-1220 ℃, the extrusion ratio lambda is determined by the ratio of the wall thickness of the inner layer and the outer layer of the pipe blank, and lambda is (15-18) x b01/b02(ii) a The extrusion speed v is determined by the length L of the pipe, and v is (1.1-1.8) multiplied by 10-2xL, L is mm; after extrusion, air cooling to room temperature is carried out, and the expanded diameter hot extruded bimetal composite pipe fitting is obtained, as shown in figure 3;
(3) thermal refining treatment of the hot extrusion composite pipe fitting: the quenching temperature is 850-870 ℃, and the quenching heat preservation time t2From the wall thickness b of the outer layer of the pipe1And inner layer wall thickness b2Determination of t2＝(4.2～4.8)×(b1+b2) To reach t2Cooling the mixture to room temperature by water; the tempering temperature is 580-600 ℃, and the tempering heat preservation time t3B is formed by1And b2Determination of t3＝(5.5～7.5)×(b1+b2) To reach t3Post air cooling to room temperature t2And t3Units are min, b1And b2The unit is mm;
the invention has the advantages and beneficial effects that: the extrusion temperature, the extrusion ratio and the extrusion speed in the hot extrusion process are quickly and accurately determined according to the geometric dimension of the tube blank, and meanwhile, the extrusion temperature is determined according to the inner surface temperature of the inner layer of the tube blank and the large extrusion ratio is adopted, so that the coordinated plastic deformation capacity of the inner layer and the outer layer can be improved, and the bonding strength performance of the bonding interface of the inner layer and the outer layer is improved.
Drawings
FIG. 1 is a dimension identification drawing of a bimetallic as-cast tube blank;
FIG. 2 is a schematic view of expanding hot extrusion of a bimetallic as-cast tube blank;
FIG. 3 is a dimension identification diagram of a hot extruded bimetallic composite pipe forging;
in the figure: 1, a bimetallic pipe blank outer layer 2, a bimetallic pipe blank inner layer 3, a bimetallic pipe fitting forging outer layer 4, a bimetallic pipe fitting forging inner layer 5, an extrusion rod 6, an extrusion cylinder 7 and an extrusion convex die;
D0outside diameter of bimetallic tube blank, d0Internal diameter of bimetallic tube0Length of bimetallic tube blank, b01Outer wall thickness of bimetallic tube blank, b02-inner wall thickness of bimetallic tube blank, D-outer diameter of bimetallic tube forging, D-inner diameter of bimetallic tube forging, L-length of bimetallic tube forging, b1Outer wall thickness of bimetallic pipe forgings, b2Inner wall thickness of the bimetallic pipe forging.
Detailed Description
The invention is described in further detail below with reference to the figures and specific embodiments.
Fig. 1 is a dimension identification diagram of a bimetal as-cast tube blank, and fig. 3 is a dimension identification diagram of a bimetal composite pipe forging after expanding hot extrusion, namely the bimetal composite expanding hot extrusion pipe of the invention.
Example 1
The embodiment provides an expanding hot extrusion process of a bimetal alloy steel composite pipe, wherein an outer layer is pipeline steel X65, an inner layer is stainless steel 304L, and the size of a bimetal cast-state pipe blank is as follows: 820mm in outside diameter D, 60mm in inside diameter D, 700mm in length L, and thickness b of outer layer01200mm, inner layer wall thickness b02180 mm; the hot extrusion bimetal composite pipe fitting has the following dimensions: 1200mm outside diameter D, 900mm inside diameter D, 790mm length L, outer layer wall thickness b1Inner layer thickness b of 40%235 mm; the forming process comprises the following steps:
(1) normalizing the bimetal as-cast tube blank: the normalizing temperature is 880 ℃, and the preset heat preservation time t is reached1Cooling to room temperature by a blower after 2.2 (200+180) 836 min;
(2) expanding and hot extruding the bimetal cast-state tube blank: as shown in fig. 2, 3 is an outer layer of the bimetal pipe forging, 4 is an inner layer of the bimetal pipe forging, 5 is an extrusion rod, 6 is an extrusion cylinder, 7 is an extrusion convex die, the extrusion temperature is determined by the inner surface temperature of the inner layer of the pipe blank, T is 1180 ℃, the extrusion ratio λ is 15 × 200/180 is 16.7, and the extrusion speed v is 1.1 × 10-2The x 790 is 8.69mm/s, air cooling is carried out to room temperature after extrusion is finished, and the dimension of the bimetal composite expanding hot extrusion pipe is obtained, wherein the outer diameter D is 1200mm, the inner diameter D is 900mm, the length L is 790mm, and the outer layer wall thickness b1Inner layer thickness b of 40%235mm as shown in figure 3;
(3) thermal refining treatment of the hot extrusion composite pipe fitting: the quenching temperature is 850 ℃, and the quenching heat preservation time t24.2 × (40+35) ═ 315min, until t2Cooling with water to room temperature, tempering at 580 deg.C, and maintaining for t35.5 × (40+35) ═ 412min, t is reached3Then air-cooling to room temperature.
Example 2
The embodiment provides an expanding hot extrusion process of a bimetal alloy steel composite pipe, wherein an outer layer is pipeline steel X65, an inner layer is stainless steel 304L, and the size of a bimetal cast-state pipe blank is as follows: outer diameter D ═ 820mm, inner diameter d 60mm, length L700 mm, outer layer wall thickness b01200mm, inner layer wall thickness b02180 mm; the hot extrusion bimetal composite pipe fitting has the following dimensions: 1200mm outside diameter D, 900mm inside diameter D, 790mm length L, outer layer wall thickness b1Inner layer thickness b of 40%235 mm; the forming process comprises the following steps:
(1) normalizing the bimetal as-cast tube blank: the normalizing temperature is 890 ℃ and the preset heat preservation time t is reached1After 2.5 (200+180) 950min, air-cooling to room temperature by a blower;
(2) expanding and hot extruding the bimetal cast-state tube blank: as shown in fig. 2, 3 is an outer layer of the bimetal pipe forging, 4 is an inner layer of the bimetal pipe forging, 5 is an extrusion rod, 6 is an extrusion cylinder, 7 is an extrusion punch, the extrusion temperature is determined by the inner surface temperature of the inner layer of the pipe blank, T is 1200 ℃, the extrusion ratio lambda is 16 × 200/180 is 17.7, and the extrusion speed v is 1.5 × 10-2X 790 is 11.85mm/s, air cooling is carried out to room temperature after extrusion is finished, and the dimension of the bimetal composite expanding hot extrusion pipe is obtained, wherein the outer diameter D is 1200mm, the inner diameter D is 900mm, the length L is 790mm, and the outer layer wall thickness b is1Inner layer thickness b of 40%235mm as shown in figure 3;
(3) thermal refining treatment of the hot extrusion composite pipe fitting: the quenching temperature is 860 ℃, and the quenching heat preservation time t24.5 × (40+35) ═ 337min, to t2Cooling with water to room temperature at 590 deg.C, and keeping the temperature for t36.5 (40+35) ═ 487min, to reach t3Then air-cooling to room temperature.
Example 3
The embodiment provides an expanding hot extrusion process of a bimetal alloy steel composite pipe, wherein an outer layer is pipeline steel X65, an inner layer is stainless steel 304L, and the size of a bimetal cast-state pipe blank is as follows: 820mm in outside diameter D, 60mm in inside diameter D, 700mm in length L, and thickness b of outer layer01200mm, inner layer wall thickness b02180 mm; the hot extrusion bimetal composite pipe fitting has the following dimensions: 1200mm outside diameter D, 900mm inside diameter D, 790mm length L, outer layer wall thickness b1Inner layer thickness b of 40%235 mm; the forming process comprises the following steps:
(1) as-cast bimetallicNormalizing the tube blank: the normalizing temperature is 900 ℃, and the preset heat preservation time t is reached1After 2.8 (200+180) 1064min, air-cooling to room temperature by using a blower;
(2) expanding and hot extruding the bimetal cast-state tube blank: as shown in fig. 2, 3 is an outer layer of the bimetal pipe forging, 4 is an inner layer of the bimetal pipe forging, 5 is an extrusion rod, 6 is an extrusion cylinder, 7 is an extrusion punch, the extrusion temperature is determined by the inner surface temperature of the inner layer of the pipe blank, T is 1220 ℃, the extrusion ratio λ is 18 × 200/180 is 20, and the extrusion speed v is 1.8 × 10-2The x 790 is 14.22mm/s, air cooling is carried out to room temperature after extrusion is finished, and the dimension of the bimetal composite expanding hot extrusion pipe is obtained, wherein the outer diameter D is 1200mm, the inner diameter D is 900mm, the length L is 790mm, and the outer layer wall thickness b1Inner layer thickness b of 40%235mm as shown in figure 3;
(3) thermal refining treatment of the hot extrusion composite pipe fitting: the quenching temperature is 870 ℃, and the quenching heat preservation time t24.8 (40+35) 360min, t2Cooling with water to room temperature, tempering at 600 deg.C, and holding for t37.5 × (40+35) ═ 562min, until t3Then air-cooling to room temperature.

Claims (1)

1. A diameter-expanding hot extrusion process for a bimetal alloy steel composite pipe is characterized by comprising the following process steps:
(1) normalizing the bimetal as-cast tube blank: the normalizing temperature is 880-900 ℃, and the preset heat preservation time t is reached1Then air-cooled to room temperature by a blower t1From the outer wall thickness b of the tube blank01And inner layer wall thickness b02Determination of t1＝(2.2～2.8)×(b01+b02)，t1Unit is min, b01And b02The unit is mm;
(2) expanding and hot extruding the bimetal cast-state tube blank: the extrusion temperature T is determined by the inner surface temperature of the inner layer of the tube blank, the extrusion is started when the temperature T is 1180-1220 ℃, the extrusion ratio lambda is determined by the ratio of the wall thickness of the inner layer and the wall thickness of the outer layer of the tube blank, and lambda is (15-18) x b01/b02(ii) a The extrusion speed v is determined by the length L of the pipe, and v is (1.1-1.8) multiplied by 10-2L is multiplied by L, the unit of L is mm, and the extruded material is air-cooled to room temperature to obtain the expanded diameterA hot extruded bimetallic composite pipe;
(3) thermal refining treatment of the hot extrusion composite pipe fitting: the quenching temperature is 850-870 ℃, and the quenching heat preservation time t2From the wall thickness b of the outer layer of the pipe1And inner layer wall thickness b2Determination of t2＝(4.2～4.8)×(b1+b2) To reach t2Cooling the mixture to room temperature by water; the tempering temperature is 580-600 ℃, and the tempering heat preservation time t3B is formed by1And b2Determination of t3＝(5.5～7.5)×(b1+b2) To reach t3Post air cooling to room temperature t2And t3Units are min, b1And b2In mm.
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Cited By (2)

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CN117862267A (en) * 2024-01-11 2024-04-12 番禺珠江钢管（连云港）有限公司 Expanding forming equipment for large-caliber bimetal composite pipe
CN117961446A (en) * 2024-03-28 2024-05-03 河北汇中管道装备有限公司 Bimetal composite pipe fitting and preparation method thereof

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117862267A (en) * 2024-01-11 2024-04-12 番禺珠江钢管（连云港）有限公司 Expanding forming equipment for large-caliber bimetal composite pipe
CN117862267B (en) * 2024-01-11 2024-06-25 番禺珠江钢管（连云港）有限公司 Expanding forming equipment for large-caliber bimetal composite pipe
CN117961446A (en) * 2024-03-28 2024-05-03 河北汇中管道装备有限公司 Bimetal composite pipe fitting and preparation method thereof

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