CN104668305A - Method for molding dual-layer alloy-steel pipe - Google Patents

Method for molding dual-layer alloy-steel pipe Download PDF

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Publication number
CN104668305A
CN104668305A CN201510060204.9A CN201510060204A CN104668305A CN 104668305 A CN104668305 A CN 104668305A CN 201510060204 A CN201510060204 A CN 201510060204A CN 104668305 A CN104668305 A CN 104668305A
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China
Prior art keywords
steel pipe
double
layer
layer alloy
blank
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CN201510060204.9A
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Chinese (zh)
Inventor
王锦永
叶丙义
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HANDAN XINXING SPECIAL PIPE MATERIAL Co Ltd
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HANDAN XINXING SPECIAL PIPE MATERIAL Co Ltd
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Priority to CN201510060204.9A priority Critical patent/CN104668305A/en
Publication of CN104668305A publication Critical patent/CN104668305A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06Manufacture 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

Abstract

The invention discloses a method for molding a dual-layer alloy-steel pipe. Carbon steel is adopted as an outer layer material of the dual-layer steel pipe; stainless steel is adopted as an inner later material. The method comprises the following molding steps: preparing a blank of the dual-layer steel pipe; boring the blank of the dual-layer steel pipe; uniformly heating the bored blank to 1170-1250 DEG C; carrying out hot piercing on the heated blank by virtue of a perforating machine and producing a hollow billet; carrying out hot rolling on the hollow billet by virtue of a rolling mill, and producing a pierced billet; and carrying out hot sizing on the pierced billet by virtue of a sizing mill and producing the dual-layer alloy-steel pipe. An interference fit composite technology is put into full play; the inner alloy and the outer alloy of the produced dual-layer alloy-steel pipe are firmly combined; the outer alloy is carbon steel and has high strength; the inner alloy is stainless steel and has good corrosion resistance; the precious metal is saved; the material cost is reduced; and meanwhile, a hot piercing procedure and a hot rolling procedure are adopted; the molding cost is reduced; the energy consumption is reduced; and the competitive power of enterprises is improved.

Description

A kind of forming method of double-layer alloy steel pipe
Technical field
The present invention relates to steel pipe forming technical field, specifically a kind of forming method of double-layer alloy steel pipe.
Background technology
The manufacturing process of composite seamless steel pipe has a lot, and as explosive forming compound, the shaping compound of built-up welding etc., application is employing two kinds of finished product seamless steel pipes carry out compound method as raw material more widely.
From the angle analysis of combination process and deformation characteristics, all technique all can produce bimetallic composite seamless steel pipe: the technique that centrifugal casting operation combines with extrusion process, being applicable to very much manufacturing inner layer metal is the high-end multiple tube products such as nickel-base alloy, but this technique can cause the problem that lumber recovery is low, and extrusion process cost is high, therefore the application of this technique is wideless; Adopting extrusion process to manufacture inner alloy is stainless double-layer alloy steel pipe, although effective, extruding cost is high; Other combination process are all because the defects such as bond strength is low are only applied to low side field.
Summary of the invention
The object of the present invention is to provide a kind of forming method of double-layer alloy steel pipe, the inside and outside two-layer alloy of the double-layer alloy steel pipe adopting the present invention to produce combines firmly, has saved precious metal, has reduced material cost, have employed hot rolling technology shaping simultaneously, reduce shaping cost.
For achieving the above object, the invention provides following technical scheme:
A forming method for double-layer alloy steel pipe, the outer material of described double-layer alloy steel pipe is carbon steel, and internal layer material is stainless steel; Concrete forming step is as follows:
(1) blank of double-layer alloy steel pipe is prepared; Respectively the composite contact face of internal layer pipe, outer pipe is carried out to the taper WEDM of 1:200, surface roughness is 3.2 μm; Adopt interference fit between internal layer pipe, outer pipe, the assembling magnitude of interference is not more than 0.15mm; Utilize forcing press that internal layer pipe is pressed into outer pipe, prepare double-layer alloy blank; Double-layer alloy blank is vacuumized, then two ends soldering and sealing;
(2) bore hole is carried out to the blank of double-layer alloy steel pipe;
(3) blank after bore hole is uniformly heated to 1170 DEG C-1250 DEG C;
(4) use punch that the blank after heating is carried out hot piercing, produce hollow billet;
(5) use milling train that hollow billet is carried out hot rolling, produce hollow forging;
(6) adopt sizing mill by hollow forging hot size, produce double-layer alloy steel pipe.
As the further scheme of the present invention: the outer material of described double-layer alloy steel pipe selects the one in following steel: 10#, 15#, 20#, 25#, 16Mn, 20Mn2,25Mn, 12MnV, 15MnV, 20MnV; The internal layer material of described double-layer alloy steel pipe selects the one in following steel: 07Cr19Ni10,07Cr19Ni11Ti, 07Cr18Ni11Nb, 07Cr25Ni21NbN, 10Cr18Ni9NbCu3BN, 08Cr18Ni11NbFG.
As the further scheme of the present invention: in described step (2), carry out bore hole to double-layer alloy blank, bore diameter is 20mm-50mm.
As the further scheme of the present invention: in described step (4), the enlarging rate in hot piercing stage is at 3%-10%, and lengthening coefficient is 1.5-2.0.
As the further scheme of the present invention: in described step (5), in the hot rolling stage, hollow forging external diameter 2mm-8mm less of capillary outer diameter, lengthening coefficient is 1.2-1.8.
As the further scheme of the present invention: in described step (6), the lengthening coefficient in hot size stage is 1.1-1.4.
Compared with prior art, the invention has the beneficial effects as follows:
The present invention has given full play to the feature of interference fit complex technique, and the blank binder course of double-layer alloy steel pipe seamlessly transits, and bond strength is high, ensure that the effective combination between double-layer alloy when adopting hot rolling technology to produce; The feature of the low cost of the technical advantage of interference fit compound and hot rolling technology is combined, more highlights the superiority of its production technology.
The inside and outside two-layer alloy of the double-layer alloy steel pipe adopting the present invention to produce combines firmly, outer layer alloys is carbon steel, have high intensity, inner alloy is stainless steel, has good corrosion resistance, save precious metal, reduce material cost, have employed hot piercing and hot-rolled process simultaneously, not only reduce shaping cost, and reduce energy resource consumption, improve the competitiveness of enterprise.
Detailed description of the invention
Below in conjunction with the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment 1
In the embodiment of the present invention, a kind of forming method of double-layer alloy steel pipe, double-layer alloy steel pipe material: skin is 20#, internal layer is 07Cr19Ni11Ti, and product specification is φ 110mm*5.5mm(outer 2mm+ internal layer 3.5mm).
The moulding process step of described double-layer alloy steel pipe is as follows:
(1) blank of double-layer alloy steel pipe is prepared: the billet size first calculating outer 20# and internal layer 07Cr19Ni11Ti, then carry out 1:200 taper WEDM to the inner circle of outer 20# blank and the cylindrical of internal layer 07Cr19Ni11Ti blank respectively, surface roughness gets 3.2 μm; Ectonexine adopts interference fit, and the assembling magnitude of interference is not more than 0.15mm; Utilize forcing press that internal layer pipe is pressed into outer pipe, prepare double-layer alloy blank; Double-layer alloy blank is vacuumized, then two ends soldering and sealing;
(2) carry out bore hole to the blank of double-layer alloy steel pipe, bore diameter is 30mm;
(3) blank after bore hole is uniformly heated to 1180 DEG C-1220 DEG C;
(4) the hot piercing stage, enlarging rate is 6%, and lengthening coefficient is 1.8;
(5) the hot rolling stage, hollow forging external diameter 4mm less of capillary outer diameter, lengthening coefficient is 1.6;
(6) the hot size stage, lengthening coefficient is 1.25.
Embodiment 2
In the embodiment of the present invention, a kind of forming method of double-layer alloy steel pipe, double-layer alloy steel pipe material: skin is 16Mn, internal layer is 07Cr18Ni11Nb, and product specification is φ 164.5mm*7mm(outer 2.5mm+ internal layer 4.5mm).
The moulding process step of described double-layer alloy steel pipe is as follows:
(1) blank of double-layer alloy steel pipe is prepared: the billet size first calculating outer 16Mn and internal layer 07Cr18Ni11Nb, then carry out 1:200 taper WEDM to the inner circle of outer 16Mn blank and the cylindrical of internal layer 07Cr18Ni11Nb blank respectively, surface roughness gets 3.2 μm; Ectonexine adopts interference fit, and the assembling magnitude of interference is not more than 0.15mm; Utilize forcing press that internal layer pipe is pressed into outer pipe, prepare double-layer alloy blank; Double-layer alloy blank is vacuumized, then two ends soldering and sealing;
(2) carry out bore hole to the blank of double-layer alloy steel pipe, bore diameter is 30mm;
(3) blank after bore hole is uniformly heated to 1180 DEG C-1220 DEG C;
(4) the hot piercing stage, enlarging rate is 6%, and lengthening coefficient is 1.8;
(5) the hot rolling stage, hollow forging external diameter 4mm less of capillary outer diameter, lengthening coefficient is 1.6;
(6) the hot size stage, lengthening coefficient is 1.25.
Embodiment 3
In the embodiment of the present invention, a kind of forming method of double-layer alloy steel pipe, double-layer alloy steel pipe material: skin is 12MnV, internal layer is 07Cr25Ni21NbN, and product specification is φ 89mm*8.5mm(outer 3mm+ internal layer 5.5mm).
The moulding process step of described double-layer alloy steel pipe is as follows:
(1) blank of double-layer alloy steel pipe is prepared; First calculate the billet size of outer 12MnV and internal layer 07Cr25Ni21NbN, then carry out 1:200 taper WEDM to the inner circle of outer 12MnV blank and the cylindrical of internal layer 07Cr25Ni21NbN blank respectively, surface roughness gets 3.2 μm; Ectonexine adopts interference fit, and the assembling magnitude of interference is not more than 0.15mm; Utilize forcing press that internal layer pipe is pressed into outer pipe, prepare double-layer alloy blank; Double-layer alloy blank is vacuumized, then two ends soldering and sealing;
(2) carry out bore hole to the blank of double-layer alloy steel pipe, bore diameter is 20mm;
(3) blank after bore hole is uniformly heated to 1200 DEG C-1230 DEG C;
(4) the hot piercing stage, enlarging rate is 8%, and lengthening coefficient is 2.0;
(5) the hot rolling stage, hollow forging external diameter 5mm less of capillary outer diameter, lengthening coefficient is 1.5;
(6) the hot size stage, lengthening coefficient is 1.15.
The present invention has given full play to the feature of interference fit complex technique, and the blank binder course of double-layer alloy steel pipe seamlessly transits, and bond strength is high, ensure that the effective combination between double-layer alloy when adopting hot rolling technology to produce; The feature of the low cost of the technical advantage of interference fit compound and hot rolling technology is combined, more highlights the superiority of its production technology.
The inside and outside two-layer alloy of the double-layer alloy steel pipe adopting the present invention to produce combines firmly, outer layer alloys is carbon steel, have high intensity, inner alloy is stainless steel, has good corrosion resistance, save precious metal, reduce material cost, have employed hot piercing and hot-rolled process simultaneously, not only reduce shaping cost, and reduce energy resource consumption, improve the competitiveness of enterprise.
To those skilled in the art, obviously the invention is not restricted to the details of above-mentioned one exemplary embodiment, and when not deviating from spirit of the present invention or essential characteristic, the present invention can be realized in other specific forms.Therefore, no matter from which point, all should embodiment be regarded as exemplary, and be nonrestrictive, scope of the present invention is limited by claims instead of above-mentioned explanation, and all changes be therefore intended in the implication of the equivalency by dropping on claim and scope are included in the present invention.
In addition, be to be understood that, although this description is described according to embodiment, but not each embodiment only comprises an independently technical scheme, this narrating mode of description is only for clarity sake, those skilled in the art should by description integrally, and the technical scheme in each embodiment also through appropriately combined, can form other embodiments that it will be appreciated by those skilled in the art that.

Claims (6)

1. a forming method for double-layer alloy steel pipe, is characterized in that, the outer material of described double-layer alloy steel pipe is carbon steel, and internal layer material is stainless steel; Concrete forming step is as follows:
(1) blank of double-layer alloy steel pipe is prepared; Respectively the composite contact face of internal layer pipe, outer pipe is carried out to the taper WEDM of 1:200, surface roughness is 3.2 μm; Adopt interference fit between internal layer pipe, outer pipe, the assembling magnitude of interference is not more than 0.15mm; Utilize forcing press that internal layer pipe is pressed into outer pipe, prepare double-layer alloy blank; Double-layer alloy blank is vacuumized, then two ends soldering and sealing;
(2) bore hole is carried out to the blank of double-layer alloy steel pipe;
(3) blank after bore hole is uniformly heated to 1170 DEG C-1250 DEG C;
(4) use punch that the blank after heating is carried out hot piercing, produce hollow billet;
(5) use milling train that hollow billet is carried out hot rolling, produce hollow forging;
(6) adopt sizing mill by hollow forging hot size, produce double-layer alloy steel pipe.
2. the forming method of double-layer alloy steel pipe according to claim 1, it is characterized in that, the outer material of described double-layer alloy steel pipe selects the one in following steel: 10#, 15#, 20#, 25#, 16Mn, 20Mn2,25Mn, 12MnV, 15MnV, 20MnV; The internal layer material of described double-layer alloy steel pipe selects the one in following steel: 07Cr19Ni10,07Cr19Ni11Ti, 07Cr18Ni11Nb, 07Cr25Ni21NbN, 10Cr18Ni9NbCu3BN, 08Cr18Ni11NbFG.
3. the forming method of double-layer alloy steel pipe according to claim 1, is characterized in that, in described step (2), carries out bore hole to double-layer alloy blank, and bore diameter is 20mm-50mm.
4. the forming method of double-layer alloy steel pipe according to claim 1, is characterized in that, in described step (4), the enlarging rate in hot piercing stage is at 3%-10%, and lengthening coefficient is 1.5-2.0.
5. the forming method of double-layer alloy steel pipe according to claim 1, is characterized in that, in described step (5), in the hot rolling stage, hollow forging external diameter 2mm-8mm less of capillary outer diameter, lengthening coefficient is 1.2-1.8.
6. the forming method of double-layer alloy steel pipe according to claim 1, is characterized in that, in described step (6), the lengthening coefficient in hot size stage is 1.1-1.4.
CN201510060204.9A 2015-02-05 2015-02-05 Method for molding dual-layer alloy-steel pipe Pending CN104668305A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105150608A (en) * 2015-10-23 2015-12-16 湖南三泰新材料股份有限公司 Stainless steel/carbon steel bi-metal thread steel and composite molding technology thereof
CN105252843A (en) * 2015-10-23 2016-01-20 湖南三泰新材料股份有限公司 Stainless steel-carbon steel doublemetal channel steel and composite molding technology thereof
CN106048375A (en) * 2016-08-15 2016-10-26 苏州润利电器有限公司 Double-layer composite high-performance casting alloy for electric fittings
CN108723574A (en) * 2018-06-21 2018-11-02 马晓峰 Seamless composite steel tube and its production technology
CN108856288A (en) * 2018-05-04 2018-11-23 太原科技大学 A kind of corrosion resistant structural steel production method
CN111906147A (en) * 2020-07-02 2020-11-10 山西钢合力新材料科技有限公司 Pretreatment method of stainless steel composite pipe
CN115430995A (en) * 2022-09-05 2022-12-06 攀钢集团成都钢钒有限公司 Manufacturing method of 50Mn18Cr4V nonmagnetic steel pipe

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105150608A (en) * 2015-10-23 2015-12-16 湖南三泰新材料股份有限公司 Stainless steel/carbon steel bi-metal thread steel and composite molding technology thereof
CN105252843A (en) * 2015-10-23 2016-01-20 湖南三泰新材料股份有限公司 Stainless steel-carbon steel doublemetal channel steel and composite molding technology thereof
CN106048375A (en) * 2016-08-15 2016-10-26 苏州润利电器有限公司 Double-layer composite high-performance casting alloy for electric fittings
CN108856288A (en) * 2018-05-04 2018-11-23 太原科技大学 A kind of corrosion resistant structural steel production method
CN108723574A (en) * 2018-06-21 2018-11-02 马晓峰 Seamless composite steel tube and its production technology
CN111906147A (en) * 2020-07-02 2020-11-10 山西钢合力新材料科技有限公司 Pretreatment method of stainless steel composite pipe
CN111906147B (en) * 2020-07-02 2021-12-10 山西钢合力新材料科技有限公司 Pretreatment method of stainless steel composite pipe
CN115430995A (en) * 2022-09-05 2022-12-06 攀钢集团成都钢钒有限公司 Manufacturing method of 50Mn18Cr4V nonmagnetic steel pipe

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Application publication date: 20150603