CN103286156A - Oblique rolling molding process of double-layered steel pipe - Google Patents
Oblique rolling molding process of double-layered steel pipe Download PDFInfo
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- CN103286156A CN103286156A CN2013102278924A CN201310227892A CN103286156A CN 103286156 A CN103286156 A CN 103286156A CN 2013102278924 A CN2013102278924 A CN 2013102278924A CN 201310227892 A CN201310227892 A CN 201310227892A CN 103286156 A CN103286156 A CN 103286156A
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- 238000000034 method Methods 0.000 title claims description 25
- 238000000465 moulding Methods 0.000 title claims description 11
- 229910000831 Steel Inorganic materials 0.000 title claims description 7
- 239000010959 steel Substances 0.000 title claims description 7
- 238000005096 rolling process Methods 0.000 title description 2
- 238000005242 forging Methods 0.000 claims description 33
- 238000003801 milling Methods 0.000 claims description 12
- 238000004513 sizing Methods 0.000 claims description 12
- 229910045601 alloy Inorganic materials 0.000 claims description 9
- 239000000956 alloy Substances 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 claims description 5
- 238000003754 machining Methods 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 5
- 238000009750 centrifugal casting Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 description 8
- 238000011084 recovery Methods 0.000 description 6
- 230000002950 deficient Effects 0.000 description 5
- 229910000677 High-carbon steel Inorganic materials 0.000 description 4
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 239000013078 crystal Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 238000009785 tube rolling Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
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Abstract
The invention discloses an oblique rolling molding process of a double-layered steel pipe and belongs to the field of a pipe rolling pipe. The oblique rolling molding process disclosed by the invention comprises the following steps of: firstly, pretreating a metallurgical bonded centrifugal blank; carrying out rolling twice on the centrifugal blank; and finally carrying out straightening and the like to obtain a target double-layered steel pipe, wherein the first rolling adopts a small elongation coefficient, and the second rolling adopts a large elongation coefficient. According to the oblique rolling molding process, twice rolling deformation procedures are used; the first rolling deformation procedure improves a casting-state structure of the centrifugal blank, thins crystal particles and improves the strength and the plasticity of the centrifugal blank; and the second rolling deformation procedure is used for producing a finished-product steel pipe with the required specification. According to the oblique rolling molding process, defects of rolling and folding, internally peeling off and the like in a production process of the double-layered steel pipe are effectively avoided; the yield and the economic benefits of the double-layered steel pipe are greatly improved; the yield reaches 90%.
Description
Technical field
The present invention relates to tube rolling method field.
Background technology
Outer is that the advantage of double-layer pipe of the metallurgical binding of high-carbon steel is for mild steel, internal layer: inner layer wall has higher hardness, wearability, and outer wall has certain toughness, intensity, and outer wall has good parcel, protective effect to inner layer wall.This kind structure has reduced the fragility of pipe, has improved pipe service life and security.
The manufacture process of double-layer pipe is: (1) adopts centrifugal casting technique, at first pours into a mould outer layer alloys, treats that outer layer alloys solidifies back and temperature when being lower than 70 ℃-100 ℃ of its fusing points, then inner alloy is poured in the pipe die, prepares the centrifugal blank of metallurgical binding; (2) pore, pitted skin, the slag blanket of inwall, outer wall removed in machined; (3) heating of pipe blank that will have the metallurgical binding layer is to uniform temperature, and oblique milling becomes the pipe of certain specification in oblique milling equipment.
The employed oblique roll process of existing production double-layer pipe is: the monolateral 3mm that machines away of (1) centrifugal blank outer wall, the monolateral 3mm that machines away of inwall; (2) blank is heated to 1170 ℃-1220 ℃ in annular furnace; (3) produce through normal once perforated, tube rolling, sizing operation.
Double-layer pipe inwall by existing oblique roll process production has occurred rolling folding in a large number, has stuck up defectives such as skin, qualification rate only 30%.
Summary of the invention
The invagination that produces when overcoming existing explained hereafter double-layer pipe, stick up the skin defective, the invention provides a kind of oblique milling moulding process of double-layer pipe, this technology can effectively avoid on the double-layer pipe inwall roll folding, in stick up defective such as skin, the lumber recovery of raising steel pipe.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of oblique milling moulding process of double-layer pipe, and processing step is as follows:
The first step adopts centrifugal casting technique, at first pours into a mould outer layer alloys, pours into a mould inner alloy again, is prepared into the centrifugal blank of metallurgical binding;
In second step, more than the monolateral 5mm of machining away of outer wall of the centrifugal blank that the first step is obtained, inwall is monolateral to be machined away more than the 5mm;
In the 3rd step, the centrifugal blank that second step was handled well evenly is heated to 1170 ℃-1220 ℃;
In the 4th step, carry out the pierced billet first time and decide deformation operation and obtain light pipe;
In the 5th step, the light pipe that the 4th step was obtained evenly is heated to 1170 ℃-1220 ℃;
In the 6th step, carry out the pierced billet second time and decide deformation operation and obtain fished pipe;
The 7th step, fished pipe is aligned, cut head, tail then, obtain the target double-layer pipe.
The concrete steps that the described first time, pierced billet was operated surely are: at first centrifugal blank is obtained first hollow billet through punch, in this stage, the enlarging rate of centrifugal blank is controlled at 3%-10%, lengthening coefficient is controlled at 1.4-1.6; Then described first hollow billet is obtained first hollow forging through pipe mill, in this stage, the lengthening coefficient of described first hollow billet is controlled at 1.1-1.4, the external diameter of first hollow forging that obtains is than the little 2mm-8mm of external diameter of first hollow billet; Then described first hollow forging is obtained first light pipe through sizing mill, in this stage, the lengthening coefficient of described first hollow forging is controlled at 1.1-1.35; The light pipe that obtains is decided the blank of deformation operation as the pierced billet second time.
The concrete steps that the described second time, pierced billet was operated surely are: at first light pipe is obtained second hollow billet through punch, in this stage, the enlarging rate of described light pipe is controlled at 3%-5%, lengthening coefficient is controlled at 2-2.6; Then described second hollow billet is obtained second hollow forging through pipe mill, in this stage, the lengthening coefficient of described first hollow billet is controlled at 1.2-1.5, the external diameter of second hollow forging that obtains is than the little 2mm-7mm of external diameter of second hollow billet; Then described second hollow forging is passed through sizing mill, in this stage, the lengthening coefficient of second hollow forging is set in 1.1-1.3, produce the fished pipe that requires specification.
When the centrifugal blank that heats metallurgical binding and light pipe, heat time heating time, the heating standard was 1.4min-1.6min/mm according to the THICKNESS CALCULATION of centrifugal blank or light pipe.
The outer material of described double-layer pipe is selected a kind of in the following steel: 10#, 15#, 20#, 25#, 16Mn, 20Mn2,25Mn, 12MnV, 15MnV, 20MnV.
The internal layer material of described double-layer pipe is selected a kind of in the following steel: GCr15, GCr15SiMn, GCr15SiMo, GCr18Mo, 60Mn, 65Mn, 70Mn.
The technological progress of adopting technique scheme to obtain is: the present invention is conducive to slag blanket, open texture, pore are removed fully by strengthening the monolateral processing capacity of the inside and outside wall of centrifugal blank; Adopted the fixed distortion operation of twice pierced billet, the as-cast structure that has improved centrifugal blank is out of shape in pierced billet for the first time surely, refinement crystal grain, intensity and the plasticity of centrifugal blank have been improved, pierced billet for the second time is out of shape surely for the production of the fished pipe that goes out the requirement specification, the present invention has occurred when effectively having avoided double-layer pipe to produce roll folding, in stick up defective such as skin, improve lumber recovery and the economic benefit of double-layer pipe greatly, lumber recovery reaches 90%.
Description of drawings
Figure 1 shows that method flow diagram of the present invention;
Figure 2 shows that the inwall situation of the double-layer pipe that conventional method is made;
Figure 3 shows that the inwall situation of the double-layer pipe that embodiment 1 makes.
The specific embodiment
The present invention is further detailed explanation below in conjunction with Fig. 1 and instantiation.
Embodiment 1:
The double-layer pipe material is: outer is 10# mild steel, and internal layer is GCr15 high-carbon steel, and the target product specification is the outer 3mm+ internal layer of φ 89mm*8.5mm(5.5mm).
It is as follows to utilize the oblique milling moulding process of double-layer pipe to produce the concrete steps of this product:
The first step adopts centrifugal casting technique, at first pours into a mould outer layer alloys, pours into a mould inner alloy again, is prepared into the centrifugal blank of metallurgical binding.
Second step, the monolateral 5mm of machining away of outer wall of the centrifugal blank that the first step is obtained, the monolateral 5mm that machines away of inwall, the purpose of monolateral processing is in order to remove tissue part bad on outer wall and the inwall.
In the 3rd step, the centrifugal blank that second step was handled well evenly is heated to 1170; Be approximately 1.4 min-1.6 min/mms according to the THICKNESS CALCULATION of centrifugal blank heat time heating time.
In the 4th step, deformation operation is decided in pierced billet for the first time: the centrifugal blank that is obtained by the 3rd step at first passes through punch, in this stage, the enlarging rate of centrifugal blank is controlled 3%, and lengthening coefficient is controlled 1.4, obtains first hollow billet thus; Described first hollow billet through pipe mill, in this stage, is controlled the lengthening coefficient of first hollow billet 1.1, obtained first hollow forging thus, the external diameter of described first hollow forging is than the little 2mm of external diameter of first hollow billet; Described first hollow forging through sizing mill, in the sizing mill stage, 1.1, is produced the lengthening coefficient control of first hollow forging to obtain requiring the light pipe of specification, and this light pipe is divided equally is two sections, as the blank that the second time, pierced billet was out of shape surely.
In the 5th step, the light pipe that the 4th step was obtained evenly is heated to 1200 ℃, and secondary heating-up temperature is a little more than the heating-up temperature first time.
In the 6th step, deformation operation is decided in pierced billet for the second time: the light pipe that is obtained by the 5th step at first passes through punch, and the enlarging rate of light pipe is controlled 3%, and lengthening coefficient is controlled 2, obtains second hollow billet; With second hollow billet process pipe mill, in the pipe mill stage, the external diameter of second hollow forging is than the little 2mm of external diameter of second hollow billet then, and lengthening coefficient is controlled 1.2; In the sizing mill stage, lengthening coefficient is 1.1.
The 7th step, fished pipe is aligned, cut head, tail then, obtain the target double-layer pipe.
The inwall situation of the double-layer pipe that present embodiment obtains is compared with Fig. 2 as shown in Figure 3, and the inwall state of the double-layer pipe that the present invention obtains has obtained improving greatly, and the lumber recovery of double-layer pipe has reached 90%.
Embodiment 2:
The double-layer pipe material is: skin is the mild steel of 16Mn, and internal layer is the high-carbon steel of GCr15SiMn, and the target product specification is the outer 3mm+ internal layer of φ 140mm*9mm(6mm).
Concrete production craft step is:
The first step, the centrifugal blank of preparation metallurgical binding.
Second step, the monolateral 6mm of machining away of outer wall of the centrifugal blank that the first step is obtained, the monolateral 7mm that machines away of inwall.
In the 3rd step, the centrifugal blank that second step was handled well evenly heats 1180 ℃; Be approximately 1.4 min-1.6 min/mms according to the THICKNESS CALCULATION of centrifugal blank heat time heating time.
In the 4th step, pierced billet for the first time is out of shape surely: the centrifugal blank that is obtained by the 3rd step at first passes through punch, and the enlarging rate of centrifugal blank is controlled to be 5%, and lengthening coefficient is controlled to be 1.5, obtains first hollow billet; Described first hollow billet through pipe mill, is controlled the lengthening coefficient of first hollow billet 1.25, obtained first hollow forging, the external diameter of described first hollow forging is than the little 7mm of external diameter of first hollow billet; Through sizing mill, its lengthening coefficient control is produced the light pipe that obtains requiring specification 1.2 with described first hollow forging, and with this light pipe as blank that the second time, pierced billet was out of shape surely.
In the 5th step, the light pipe that the 4th step was obtained evenly is heated to 1200 ℃.
In the 6th step, pierced billet for the second time is out of shape surely: the light pipe that is obtained by the 5th step at first passes through punch, and the enlarging rate of light pipe is controlled 4%, and lengthening coefficient is controlled 2.3, obtains second hollow billet; With second hollow billet process pipe mill, lengthening coefficient control 1.3, is obtained second hollow forging then, the external diameter of described second hollow forging is than the little 5mm of external diameter of second hollow billet; Through sizing mill, its lengthening coefficient is set in 1.2, produces the fished pipe that requires specification with second hollow forging.
The 7th step, fished pipe is aligned, cut head, tail then, obtain the target double-layer pipe.
Embodiment 3
:
Double wall steel pipe material: skin is 15MnV mild steel, and internal layer is GCr18Mo high-carbon steel, and product specification is the outer 15mm+ internal layer of φ 219mm*40mm(25mm).
Concrete production craft step is:
The first step, the centrifugal blank of preparation metallurgical binding.
Second step, the monolateral 6mm of machining away of outer wall of the centrifugal blank that the first step is obtained, the monolateral 7mm that machines away of inwall.
In the 3rd step, the centrifugal blank that second step was handled well evenly is heated to 1170 ℃; Be approximately 1.4 min-1.6 min/mms according to the THICKNESS CALCULATION of centrifugal blank heat time heating time.
In the 4th step, pierced billet for the first time is out of shape surely: the centrifugal blank that is obtained by the 3rd step at first passes through punch, and the enlarging rate of centrifugal blank is controlled to be 10%, and lengthening coefficient is controlled to be 1.6, obtains first hollow billet; Described first hollow billet through pipe mill, is controlled the lengthening coefficient of first hollow billet 1.4, obtained first hollow forging, the external diameter of described first hollow forging is than the little 8mm of external diameter of first hollow billet; Through sizing mill, its lengthening coefficient control is produced the light pipe that obtains requiring specification 1.35 with described first hollow forging, and with this light pipe as blank that the second time, pierced billet was out of shape surely.
In the 5th step, the light pipe that the 4th step was obtained evenly is heated to 1170 ℃.
In the 6th step, pierced billet for the second time is out of shape surely: the light pipe that is obtained by the 5th step at first passes through punch, and the enlarging rate of light pipe is controlled 5%, and lengthening coefficient is controlled 2.6, obtains second hollow billet; With second hollow billet process pipe mill, lengthening coefficient control 1.5, is obtained second hollow forging then, the external diameter of described second hollow forging is than the little 5mm of external diameter of second hollow billet; Through sizing mill, its lengthening coefficient is set in 1.3, produces the fished pipe that requires specification with second hollow forging.
The 7th step, fished pipe is aligned, cut head, tail then, obtain the target double-layer pipe.
The present invention is conducive to slag blanket, open texture, pore are removed fully by strengthening the monolateral processing capacity of the inside and outside wall of centrifugal blank; Importantly, the present invention has adopted the fixed distortion operation of twice pierced billet, and the bigger enlarging rate of employing and less lengthening coefficient are out of shape in pierced billet for the first time surely, and main purpose is to improve the as-cast structure of centrifugal blank, and crystal grain thinning improves intensity and the plasticity of centrifugal blank; The less enlarging rate of employing and bigger lengthening coefficient are out of shape in pierced billet for the second time surely, mainly for the production of the fished pipe that goes out the requirement specification.Decide deformation operation though adopted twice pierced billet in the method for operating of the present invention, increased production cost to a certain extent, but occurred when but effectively having avoided double-layer pipe to produce roll folding, in stick up defective such as skin, improve the lumber recovery of double-layer pipe greatly, its lumber recovery has brought up to 90% by former 30%, so just can bring huge economic benefit.
Only being preferred embodiment of the present invention below, is not that the present invention is done any pro forma restriction, and any simple modification, equivalent variations and modification that every foundation technical spirit of the present invention is done above example all belong in the patented technology scheme scope of the present invention.
Claims (6)
1. the oblique milling moulding process of a double-layer pipe is characterized in that processing step is as follows:
The first step adopts centrifugal casting technique, at first pours into a mould outer layer alloys, pours into a mould inner alloy again, is prepared into the centrifugal blank of metallurgical binding;
In second step, more than the monolateral 5mm of machining away of outer wall of the centrifugal blank that the first step is obtained, inwall is monolateral to be machined away more than the 5mm;
In the 3rd step, the centrifugal blank that second step was handled well evenly is heated to 1170 ℃-1220 ℃;
In the 4th step, carry out the pierced billet first time and decide deformation operation and obtain light pipe;
In the 5th step, the light pipe that the 4th step was obtained evenly is heated to 1170 ℃-1220 ℃;
In the 6th step, carry out the pierced billet second time and decide deformation operation and obtain fished pipe;
The 7th step, fished pipe is aligned, cut head, tail then, obtain the target double-layer pipe.
2. the oblique milling moulding process of double-layer pipe according to claim 1, it is characterized in that the concrete steps that the described first time, pierced billet was operated surely are: at first centrifugal blank is obtained first hollow billet through punch, in this stage, the enlarging rate of centrifugal blank is controlled at 3%-10%, and lengthening coefficient is controlled at 1.4-1.6; Then described first hollow billet is obtained first hollow forging through pipe mill, in this stage, the lengthening coefficient of described first hollow billet is controlled at 1.1-1.4, the external diameter of first hollow forging that obtains is than the little 2mm-8mm of external diameter of first hollow billet; Then described first hollow forging is obtained first light pipe through sizing mill, in this stage, the lengthening coefficient of described first hollow forging is controlled at 1.1-1.35; The light pipe that obtains is decided the blank of deformation operation as the pierced billet second time.
3. the oblique milling moulding process of double-layer pipe according to claim 1 and 2, it is characterized in that the concrete steps that the described second time, pierced billet was operated surely are: at first light pipe is obtained second hollow billet through punch, in this stage, the enlarging rate of described light pipe is controlled at 3%-5%, and lengthening coefficient is controlled at 2-2.6; Then described second hollow billet is obtained second hollow forging through pipe mill, in this stage, the lengthening coefficient of described first hollow billet is controlled at 1.2-1.5, the external diameter of second hollow forging that obtains is than the little 2mm-7mm of external diameter of second hollow billet; Then described second hollow forging is passed through sizing mill, in this stage, the lengthening coefficient of second hollow forging is set in 1.1-1.3, produce the fished pipe that requires specification.
4. the oblique milling moulding process of double-layer pipe according to claim 1 is characterized in that heat time heating time, the heating standard was 1.4min-1.6min/mm according to the THICKNESS CALCULATION of centrifugal blank or light pipe when the centrifugal blank that heats metallurgical binding and light pipe.
5. the oblique milling moulding process of double-layer pipe according to claim 1, the outer material that it is characterized in that described double-layer pipe are selected a kind of in the following steel: 10#, 15#, 20#, 25#, 16Mn, 20Mn2,25Mn, 12MnV, 15MnV, 20MnV.
6. according to the oblique milling moulding process of claim 1 or 5 described double-layer pipes, the internal layer material that it is characterized in that described double-layer pipe is selected a kind of in the following steel: GCr15, GCr15SiMn, GCr15SiMo, GCr18Mo, 60Mn, 65Mn, 70Mn.
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| CN201310227892.4A CN103286156B (en) | 2013-06-08 | 2013-06-08 | Oblique rolling molding process of double-layered steel pipe |
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| CN201310227892.4A CN103286156B (en) | 2013-06-08 | 2013-06-08 | Oblique rolling molding process of double-layered steel pipe |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998024942A1 (en) * | 1996-12-06 | 1998-06-11 | Kawasaki Steel Corporation | Steel sheet for double wound pipe and method of producing the pipe |
| CN102274941A (en) * | 2011-08-15 | 2011-12-14 | 新兴铸管股份有限公司 | Method for making bimetal composite seamless tube with metallurgical bonding layer |
| CN102294456A (en) * | 2011-08-16 | 2011-12-28 | 新兴铸管股份有限公司 | Manufacturing method for oblique rolling of bimetallic compound seamless steel pipe by centrifugal blank |
| CN102728652A (en) * | 2012-07-17 | 2012-10-17 | 新兴铸管股份有限公司 | Manufacturing method of dual-metal seamless steel pipe with outer-layer low-carbon steel and inner-layer bearing steel |
| CN202705415U (en) * | 2012-08-08 | 2013-01-30 | 新兴铸管股份有限公司 | End cap for preventing decarburization of inner wall of double metal wear resistant pipe |
-
2013
- 2013-06-08 CN CN201310227892.4A patent/CN103286156B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998024942A1 (en) * | 1996-12-06 | 1998-06-11 | Kawasaki Steel Corporation | Steel sheet for double wound pipe and method of producing the pipe |
| CN102274941A (en) * | 2011-08-15 | 2011-12-14 | 新兴铸管股份有限公司 | Method for making bimetal composite seamless tube with metallurgical bonding layer |
| CN102294456A (en) * | 2011-08-16 | 2011-12-28 | 新兴铸管股份有限公司 | Manufacturing method for oblique rolling of bimetallic compound seamless steel pipe by centrifugal blank |
| CN102728652A (en) * | 2012-07-17 | 2012-10-17 | 新兴铸管股份有限公司 | Manufacturing method of dual-metal seamless steel pipe with outer-layer low-carbon steel and inner-layer bearing steel |
| CN202705415U (en) * | 2012-08-08 | 2013-01-30 | 新兴铸管股份有限公司 | End cap for preventing decarburization of inner wall of double metal wear resistant pipe |
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