CN101463927A - Production method of stainless steel brazing composite seamless pipe fittings - Google Patents
Production method of stainless steel brazing composite seamless pipe fittings Download PDFInfo
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- CN101463927A CN101463927A CNA2009100286116A CN200910028611A CN101463927A CN 101463927 A CN101463927 A CN 101463927A CN A2009100286116 A CNA2009100286116 A CN A2009100286116A CN 200910028611 A CN200910028611 A CN 200910028611A CN 101463927 A CN101463927 A CN 101463927A
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Abstract
The invention relates to a production method of a stainless steel brazed composite seamless pipe fitting. The production method comprises the following steps: firstly selecting a carbon steel seamless steal pipe and machining the inner surface of the carbon steel seamless steal pipe; then selecting a stainless steel pipe with the same length as the carbon steel seamless steal pipe, and machining the outer surface of the stainless steel pipe; placing the machined stainless steel pipe into the machined carbon steel seamless steal pipe, and filling a brazing material between two layers of the steel pipes, wherein, the brazing material is a Ag-Cu-Ni high-temperature silver-based brazing material with a high silver content; and machining the obtained composite pipe according to the pipe fitting desired to be produced to obtain the finished pipe fitting with the desired size and shape, wherein, the heating temperature is 910-960 DEG C. The production method has the advantages of producing the stainless steel brazed composite seamless pipe fitting with high bonding strength and being applicable to middle-pressure pipe transportation and high-pressure pipe transportation.
Description
One, technical field
The present invention relates to a kind of production method of stainless steel composite seamless pipe, relate in particular to a kind of production method of stainless steel brazing composite seamless pipe fittings.
Two, background technique
In at present modernization industry such as oil, chemical industry, water treatment are produced, at pipe conveying fluid and the occasion of corrosion-resistant requirement is arranged, all adopt stainless steel material.But stainless price is high more a lot of than carbon steel, and stainless yield strength ratio carbon steel is low, so under identical pressure environment condition, stainless consumption is more than carbon steel, so just increase the cost of engineering greatly, do not met the requirement that China builds a conservation-minded society.So press for a kind of corrosion-resistant, high strength, cheap novel pipeline, tube material.And the stainless steel composite seamless pipe of producing at present is because the compound seamless steel pipe of stainless steel that uses is common inner liner stainless steel composite steel tube, this inner liner stainless steel composite steel tube just passes through the oil hydraulic press lining in the carbon steel seamless steel pipe with stainless-steel pipe, the adhesive strength of its stainless steel lining and carbon steel layer only reaches 6～10MPa, the stainless steel composite seamless pipe of making thus can only be applicable to low pressure pipeline conveying occasion.
Three, summary of the invention
At above-mentioned shortcoming, the object of the present invention is to provide a kind of production method that can apply to the stainless steel brazing composite seamless pipe fittings of mesohigh line transportation occasion.
A kind of production method of stainless steel brazing composite seamless pipe fittings, it comprises the steps:
(1), according to the specification of required production pipe fitting, choose one section carbon steel seamless steel pipe, processing carbon steel seamless steel pipe internal surface, make the dimensional accuracy of carbon steel seamless steel pipe internal surface reach IT7 or IT8 level, cylindricity≤the 0.1mm of the figure tolerance of carbon steel seamless steel pipe, roughness Ra are 3.2um, the carbon steel seamless steel pipe outer surface that cleaning processes makes its outer surface not have greasy dirt, dust;
(2), the carbon steel tube of choosing more than the basis, choose one section isometric Stainless Steel Tube, the processing stainless steel tube outer surface, the dimensional accuracy of processing back Stainless Steel Tube outer surface reaches IT7 or IT8 level, and with step (1) in processing the carbon steel seamless steel pipe be the Spielpassung of H8/e7, cylindricity≤the 0.1mm of the figure tolerance of Stainless Steel Tube, roughness Ra are 3.2um, and the stainless-steel pipe internal surface that cleaning processes makes its internal surface not have greasy dirt, dust;
(3), the Stainless Steel Tube that processes in the step (2) is packed in the carbon steel seamless steel pipe that processes in the step (1), and insert braze in the middle of two-layer steel pipe, braze is the Ag-Cu-Ni high temperature silver-base solder of high silver content;
(4), the composite pipe that makes in the heating steps (3), form processing according to required production pipe fitting again, obtain the finished product pipe fitting of required size and shape, heating-up temperature is 910～960 ℃.
In the step (4) of aforementioned production method, the composite pipe after the heating is formed and is processed as conventional pipe fitting processing technology.
In the hot extrusion process of aforementioned production method, carbon steel and stainless steel combine through soldering, and by extruding, the inner layer stainless steel tube dilatancy is pushed outer carbon steel tube simultaneously, make carbon steel layer and stainless steel lining in conjunction with tightr, similar hot rolling technology.Its adhesive strength further improves, and it can reach 340MPa in conjunction with shear strength evidence, meets design requirement fully.
The advantage that the present invention is compared with prior art had is,
(1), compare with the stainless steel jointless pipe fitting: can reduce design wall thickness, it is light more than 20% that weight is wanted, and price will hang down 40～60% especially, has remarkable economy.
(3), compare with the inner liner stainless steel composite pipe fitting: the adhesive strength of inner liner stainless steel composite pipe fitting has only 6～10MPa, can only be applicable to the low pressure pipeline conveying; Stainless steel lining and carbon steel layer are by the soldering extrusion moulding, and its adhesive strength can reach 340MPa, are applicable to the mesohigh line transportation.
Four, embodiment
Present invention will be further described below by embodiment, but be not limited to for embodiment:
The elbow of example 1, production 90 ° of 1.5D φ 168mm* (5+2) mm:
(1), chooses the 20# carbon steel seamless steel pipe of φ 133*8mm, cutting length is 370mm, the car internal diameter is to φ 119mm (H8), cylindricity≤0.1mm, the roughness Ra of the figure tolerance of the carbon steel seamless steel pipe after the processing is 3.2um, the carbon steel seamless steel pipe outer surface that cleaning processes makes its outer surface not have greasy dirt, dust;
(2), choose 304 stainless-steel seamless pipes of one section φ 120*3mm, cutting length is 370mm, the car external diameter is to φ 119mm (e7), cylindricity≤the 0.1mm of the figure tolerance of the stainless-steel seamless pipe after the processing, roughness Ra are 3.2um, the stainless-steel pipe internal surface that cleaning processes makes its internal surface not have greasy dirt, dust;
(3), φ 119mm (e7) Stainless Steel Tube that processes in the step (2) is packed in φ 119mm (H8) the carbon steel seamless steel pipe that processes in the step (1), gap location at two steel pipes is inserted braze, braze is the Ag-Cu-Ni high temperature silver-base solder of high silver content, the gap location of one end is sealed up mouth, prevents the solder leakage;
(4), the composite pipe that installs is put into pushing machine, before the solder sealed end was placed on, by its composite pipe of heating in medium frequency, the pressurization pushing made the distortion of stainless steel internal layer expanded by heating, and extruding carbon steel skin, obtains required corner dimension and shape, and heating-up temperature is 950 ℃.
The equal tee of example 2, production φ 168* (5+2) mm:
(1), chooses the 20# carbon steel seamless steel pipe of φ 219*8mm, cutting length is 370mm, hole enlargement is to φ 232mm again, the car internal diameter is to φ 218mm (H8), cylindricity≤0.1mm, the roughness Ra of the figure tolerance of the carbon steel seamless steel pipe after the processing is 3.2um, the carbon steel seamless steel pipe outer surface that cleaning processes makes its outer surface not have greasy dirt, dust;
(2), choose 316 stainless-steel seamless pipes of one section φ 219*3mm, cutting length is 370mm, the car external diameter is to φ 218mm (e7), cylindricity≤the 0.1mm of the figure tolerance of the stainless-steel seamless pipe after the processing, roughness Ra are 3.2um, the stainless-steel pipe internal surface that cleaning processes makes its internal surface not have greasy dirt, dust;
(3), φ 218mm (e7) Stainless Steel Tube that processes in the step (2) is packed in φ 218mm (H8) the carbon steel seamless steel pipe that processes in the step (1), gap location at two steel pipes is inserted braze, braze is the Ag-Cu-Ni high temperature silver-base solder of high silver content, the gap location at two ends is sealed up mouth, prevents the solder leakage;
(4), the heating composite pipe, again composite pipe is carried out hole enlargement, flattening and pressure wrap molding, obtain required threeway size and dimension, heating-up temperature is 950 ℃.
Claims (1)
1, a kind of production method of stainless steel brazing composite seamless pipe fittings, it comprises the steps:
(1), according to the specification of required production pipe fitting, choose one section carbon steel seamless steel pipe, processing carbon steel seamless steel pipe internal surface, make the dimensional accuracy of carbon steel seamless steel pipe internal surface reach IT7 or IT8 level, cylindricity≤the 0.1mm of the figure tolerance of carbon steel seamless steel pipe, roughness Ra are 3.2um, the carbon steel seamless steel pipe outer surface that cleaning processes makes its outer surface not have greasy dirt, dust;
(2), the carbon steel tube of choosing more than the basis, choose one section isometric Stainless Steel Tube, the processing stainless steel tube outer surface, the dimensional accuracy of processing back Stainless Steel Tube outer surface reaches IT7 or IT8 level, and with step (1) in processing the carbon steel seamless steel pipe be the Spielpassung of H8/e7, cylindricity≤the 0.1mm of the figure tolerance of Stainless Steel Tube, roughness Ra are 3.2um, and the stainless-steel pipe internal surface that cleaning processes makes its internal surface not have greasy dirt, dust;
(3), the Stainless Steel Tube that processes in the step (2) is packed in the carbon steel seamless steel pipe that processes in the step (1), and insert braze in the middle of two-layer steel pipe, braze is the Ag-Cu-Ni high temperature silver-base solder of high silver content;
(4), the composite pipe that makes in the heating steps (3), form processing according to required production pipe fitting again, obtain the finished product pipe fitting of required size and shape, heating-up temperature is 910～960 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009100286116A CN101463927B (en) | 2009-01-05 | 2009-01-05 | Production method of stainless steel brazing composite seamless pipe fittings |
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| CN2009100286116A CN101463927B (en) | 2009-01-05 | 2009-01-05 | Production method of stainless steel brazing composite seamless pipe fittings |
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| CN101463927A true CN101463927A (en) | 2009-06-24 |
| CN101463927B CN101463927B (en) | 2010-04-07 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104801931A (en) * | 2015-04-11 | 2015-07-29 | 西北有色金属研究院 | Preparation method of copper-coated stainless steel metal composite rod with low leakage rate |
| CN105299335A (en) * | 2014-07-31 | 2016-02-03 | 上海天阳钢管有限公司 | Manufacturing method of carbon steel stainless steel double-metal polymerization pipe |
| CN105921957A (en) * | 2016-07-13 | 2016-09-07 | 无锡派乐科技有限公司 | Machining method for lining stainless steel composite seamless pipe fitting |
| CN107191686A (en) * | 2017-06-23 | 2017-09-22 | 志杰科技开发（大连）有限公司 | Can end thread connection high-strength stainless steel composite steel tube and its manufacture method |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH048982A (en) * | 1990-04-25 | 1992-01-13 | Usui Internatl Ind Co Ltd | Compound steel pipe |
| CN2163284Y (en) * | 1993-04-16 | 1994-04-27 | 易思竞 | Compounded metal pipe |
| CN2283170Y (en) * | 1997-04-10 | 1998-06-03 | 西南新日钢制品有限公司 | Internal stainless metal composite pipe |
| CN101234406A (en) * | 2007-02-01 | 2008-08-06 | 偃师市安力电力设备有限公司 | Method for manufacturing multiunit tube |
-
2009
- 2009-01-05 CN CN2009100286116A patent/CN101463927B/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105299335A (en) * | 2014-07-31 | 2016-02-03 | 上海天阳钢管有限公司 | Manufacturing method of carbon steel stainless steel double-metal polymerization pipe |
| CN104801931A (en) * | 2015-04-11 | 2015-07-29 | 西北有色金属研究院 | Preparation method of copper-coated stainless steel metal composite rod with low leakage rate |
| CN104801931B (en) * | 2015-04-11 | 2017-01-11 | 西北有色金属研究院 | Preparation method of copper-coated stainless steel metal composite rod with low leakage rate |
| CN105921957A (en) * | 2016-07-13 | 2016-09-07 | 无锡派乐科技有限公司 | Machining method for lining stainless steel composite seamless pipe fitting |
| CN107191686A (en) * | 2017-06-23 | 2017-09-22 | 志杰科技开发（大连）有限公司 | Can end thread connection high-strength stainless steel composite steel tube and its manufacture method |
| CN107191686B (en) * | 2017-06-23 | 2023-08-08 | 志杰科技开发（大连）有限公司 | High-strength stainless steel composite steel pipe capable of being connected through end threads and manufacturing method thereof |
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| CN101463927B (en) | 2010-04-07 |
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Effective date of registration: 20160906 Address after: Changshan town 214429 high tech Industrial Development Zone, Jiangsu city of Jiangyin Province as Bridge No. 3 in the South South Group Patentee after: The Central-South heavy industry Co., Ltd in Jiangyin Address before: 214437 No. 788 Jin Shan Road, Binjiang Development Zone, Jiangsu, Jiangyin Patentee before: Jiangyin Zhongnan Heavy Industry Furnishment Co., Ltd. |