CN102729009A - Process for manufacturing metallurgical composite pipe elbow - Google Patents
Process for manufacturing metallurgical composite pipe elbow Download PDFInfo
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- CN102729009A CN102729009A CN2012102184265A CN201210218426A CN102729009A CN 102729009 A CN102729009 A CN 102729009A CN 2012102184265 A CN2012102184265 A CN 2012102184265A CN 201210218426 A CN201210218426 A CN 201210218426A CN 102729009 A CN102729009 A CN 102729009A
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Abstract
The invention discloses a process for manufacturing a metallurgical composite pipe elbow. The process for manufacturing the metallurgical composite pipe elbow comprises the following steps of: overlaying a layer of austenitic stainless steel on the inner wall of a carbon steel/low alloy hardened and tempered steel pipe; performing hot melting on the overlaid surface; performing stress-relieving tempering; bending the carbon steel/low alloy hardened and tempered steel pipe; and finally performing heat treatment, groove preparation and surface treatment. The intensity and corrosion resistance of the metallurgical composite pipe elbow manufactured by the process are completely matched with those of a pipe; and the process has the advantages that materials are saved, production cost is reduced, production equipment is not required, and the like.
Description
Technical field
The present invention relates to a kind of metallurgical multiple tube bend pipe manufacturing process, belong to metallurgical multiple tube pipe bending technique field.
Background technology
Pipeline is widely used in industries such as machinery, oil, chemical industry, metallurgy as a kind of special equipment of mass transport, plays a part very important to modernization industry production and people's lives.Yet; Continuous development along with modern industry; It is unusual complicated and harsh that the condition of work of pipe-line system often becomes; Pipeline usually is in HTHP, bear big load and oxidation, the operating mode of corrosion, and this just requires pipeline to have good performance such as corrosion-resistant, high temperature resistant and anti-oxidant.Otherwise in the middle of the transmission course of medium, particularly oil, natural gas etc. contain H
2S, CO
2And the medium of other corrosive gas, very easily cause Corrosion of Pipeline and leakage, serious harm environment and the people's lives and property safety of medium take place.Common way of past is to adopt the austenitic stainless steel of whole corrosion resistants to make, though played certain antisepsis like this, austenitic stainless steel costs an arm and a leg, and load-carrying properties are low.So just improved production cost greatly, caused a large amount of wastes of material, and load-carrying properties also can not get ensureing.Original manufacturing process is that first carbon steel, low-alloy steel steel tube bending with single material becomes bend pipe, and at the manual austenitic stainless steel of burn-oning that covers of elbow internal wall, owing to being manual build up welding, the inner surface quality of surfacing quality and bend pipe can not get guaranteeing again.The bend pipe base material is because the heat affecting during built-up welding, and performance also can not get guaranteeing.
Summary of the invention
The purpose of this invention is to provide a kind of carrying that can guarantee material, heat resistance can guarantee the manufacturing process of metallurgical multiple tube bend pipe of the decay resistance of material again.
In order to achieve the above object, of the present inventionly provide a kind of metallurgical multiple tube to bend the manufacturing process of bend pipe, it is characterized in that concrete steps are following:
The first step: the thick austenitic stainless steel of built-up welding one deck 3mm-3.5mm on carbon steel/low-alloy quenched and tempered steel pipeline inwall;
Second step: the inwall of carbon steel/low-alloy quenched and tempered steel pipeline that the first step is obtained carries out the overlaying surface hot melt, and the background current of welding gun is 170-190A, and peak point current is 200-230A, and voltage is 10-12.5V, and speed of welding is 280-360mm/min;
The 3rd step: carbon steel/low-alloy quenched and tempered steel pipeline that second step was obtained carries out the destressing temper, and temperature is 500-600 ℃, is incubated 3-4 hour;
The 4th step: carbon steel/low-alloy quenched and tempered steel pipeline that the 3rd step was obtained bends, and bending radius is 3-10 a times of pipe diameter, and bending temperature is 900-1000 ℃, and fltting speed is 40-60mm/min;
The 5th step: carbon steel/low-alloy quenched and tempered steel pipeline bend pipe that the 4th step obtained is heat-treated under 550-670 ℃, be incubated 3-4 hour;
The 6th step: carbon steel/low-alloy quenched and tempered steel pipeline bend pipe that the 5th step was obtained carries out groove processing and surface treatment.
Preferably, the external diameter of the carbon steel in the described first step/low-alloy quenched and tempered steel pipeline is less than 450mm, and wall thickness is less than 30mm.
Preferably; Overlaying method in the described first step carries out the inner wall anti-corrosive built-up welding for adopting tungsten electrode gas shield pulse heated filament arc welding (GTAW-P-Hot wire); Current characteristics is a dc reverse connection, and the protective gas of use is 98%Ar and 2%H in percent by volume
2Mixture.
Preferably, before carrying out described the 4th step, the carbon steel/low-alloy quenched and tempered steel pipeline that earlier the 3rd step was obtained carries out nondestructive inspection, and method of detection is ultrasonic examination and penetrant inspection.
Adopt the metallurgical multiple tube bend pipe of manufacturing process manufacturing provided by the invention to have the following advantages:
1, the complete and pipeline coupling of metallurgical multiple tube bend pipe intensity and corrosive nature;
2, economical with materials reduces production costs;
3, do not need extra increasing manufacturing facilities.
The specific embodiment
Below in conjunction with embodiment the present invention is further specified.
Embodiment
The first step: the realization of metallurgical multiple tube
At external diameter 219mm, wall thickness is the thick austenitic stainless steel of built-up welding one deck 3.5mm on carbon steel/low-alloy quenched and tempered steel pipeline inwall of 12.7mm with special-purpose inner-walls of duct surfacing equipment (Fu Nisi, model C MEF);
The method of built-up welding adopts GTAW-P-Hot wire to carry out the inner wall anti-corrosive built-up welding, and current characteristics is DCEN, and protective gas adopts 98%Ar and the 2%H in percent by volume
2Mixture, adopt ER309LMo and the ER316L welding wire of Φ 1.2mm simultaneously, the technological parameter of employing is: peak point current 200-230A; Background current 170-190A, pulse voltage 10-13V, frequency 10-13V; Peak pulse duration 1: 1, gas flow 15L/min, heater current 30-70A; Heater voltage 2V-6V, wire feed rate 1000-1800mm/min, speed of welding 170-300mm/min.Postwelding is done heat treatment under 550 ℃-670 ℃, the processing time is 120min.
Second step: overlaying surface hot melt
Built-up welding well the back with welding gun wire feed hot melt overlaying surface not, voltage 10-13V; Technological parameter is: straight polarity direct current, protective gas adopts 98%Ar and the 2%H in percent by volume
2Mixture, gas flow is 15L/min, background current: 170-190A, peak point current: 200-230A, arc voltage 10-13V, frequency 10-13V, peak pulse duration 1: 1, speed of welding 250mm/min.
The 3rd step: the carbon steel behind the hot melt/low-alloy quenched and tempered steel pipeline is bent preceding destressing temper, 580 ℃ of temperatures, the processing time is 120min.
The 4th step: nondestructive inspection
After the heat treatment carbon steel/low-alloy steel pipeline is carried out nondestructive inspection, method of detection is ultrasonic examination (UT) and penetrant inspection (PT), guarantees built-up welding surface zero defect, does not have excessive defect between overlay cladding.Evaluation criteria is ASTM VIII.
The 5th step: the preparation before bending
1. existing driving is carried out in place to carbon steel, the low-alloy steel pipeline of detecting a flaw in the factory building
2. device therefor is checked and dry run
The 6th step: bend
With the curved bending machine of fire bending carbon steel, the low-alloy steel pipeline of detecting a flaw bent, bending radius is 5 times of diameters.It is 950 ℃ that control bends temperature, and fltting speed is 50mm/ minute.
The 7th step: unload pipe from the curved bending machine of fire bending.
The 8th step: curved after-baking temperature is between 570 ℃, insulation 120min.
The 9th step: detect
Require to carry out the nondestructive inspection of carbon steel, low-alloy elbow internal wall according to API 5L; The detection of female pipe hardness; Mechanical property detects; Covering the layer corrosion resistance test detects; Female pipe grain size detects; Technological property tests such as bending.
The tenth step: the groove processing and the surface treatment of bend pipe
According to order and ASME B16.49 standard-required bend pipe is carried out groove processing and surface treatment.
The bend pipe that embodiment makes is tested its performance by the corresponding standard in following each table, and the result is following:
From above each item data acknowledgement, the bend pipe according to metallurgical multiple tube bend pipe production technology of the present invention is produced satisfies each item requirement of technical specification fully.The bend pipe inner surface of gained of the present invention is more level and smooth, and is basic consistent with metallurgical multiple tube inwall.The present invention substitutes whole stainless steel elbow with carbon steel/low-alloy steel pipeline bend pipe, not only reduces cost of investment greatly, and Cr, Ni, Mo metallic element resource that can conserve expensive.The bend pipe that with the bending radius is 1500mm is an example.If all adopt the 316L stainless steel tube of φ 219X12.7, cost is more than 20000 yuan.If adopt the X6510mm+316L3mm with bore to cover the welded tube bend pipe, cost is 13000 yuan.7000 yuan have so just been saved.In addition, the antiseptic property that covers the welded tube bend pipe is the same with full 316L pipe, but intensity, heat-resisting, bearing capacity is higher.
Claims (4)
1. the manufacturing process of a metallurgical multiple tube bend pipe is characterized in that, concrete steps are following:
The first step: the thick austenitic stainless steel of built-up welding one deck 3mm-3.5mm on carbon steel/low-alloy quenched and tempered steel pipeline inwall;
Second step: the inwall of carbon steel/low-alloy quenched and tempered steel pipeline that the first step is obtained carries out the overlaying surface hot melt, and the background current of welding gun is 170-190A, and peak point current is 200-230A, and voltage is 10-12.5V, and speed of welding is 280-360mm/min;
The 3rd step: carbon steel/low-alloy quenched and tempered steel pipeline that second step was obtained carries out the destressing temper, and temperature is 500-600 ℃, is incubated 3-4 hour;
The 4th step: carbon steel/low-alloy quenched and tempered steel pipeline that the 3rd step was obtained bends, and bending radius is 3-10 a times of pipe diameter, and bending temperature is 900-1000 ℃, and fltting speed is 40-60mm/min;
The 5th step: carbon steel/low-alloy quenched and tempered steel pipeline bend pipe that the 4th step obtained is heat-treated under 550-670 ℃, be incubated 3-4 hour;
The 6th step: carbon steel/low-alloy quenched and tempered steel pipeline bend pipe that the 5th step was obtained carries out groove processing and surface treatment.
2. the manufacturing process of a kind of metallurgical multiple tube bend pipe as claimed in claim 1 is characterized in that, the external diameter of the carbon steel in the described first step/low-alloy steel pipeline is less than 325mm, and wall thickness is less than 30mm.
3. the manufacturing process of a kind of metallurgical multiple tube bend pipe as claimed in claim 1; It is characterized in that; Overlaying method in the described first step carries out the inner wall anti-corrosive built-up welding for adopting tungsten electrode gas shield pulse heated filament arc welding; Current characteristics is a dc reverse connection, and the protective gas of use is 98%Ar and 2%H in percent by volume
2Mixture.
4. the manufacturing process of a kind of metallurgical multiple tube bend pipe as claimed in claim 1 is characterized in that, before described the 4th step, carbon steel/low-alloy steel pipeline that the 3rd step was obtained carries out nondestructive inspection, and method of detection is ultrasonic examination and penetrant inspection.
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|---|---|---|---|
| CN2012102184265A CN102729009A (en) | 2012-06-27 | 2012-06-27 | Process for manufacturing metallurgical composite pipe elbow |
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| CN2012102184265A CN102729009A (en) | 2012-06-27 | 2012-06-27 | Process for manufacturing metallurgical composite pipe elbow |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102950427A (en) * | 2012-10-19 | 2013-03-06 | 中国石油天然气第七建设公司 | Method for processing bent pipe with inner wall subjected to surfacing welding |
| CN103231224A (en) * | 2013-04-17 | 2013-08-07 | 二重集团（德阳）重型装备股份有限公司 | Method for molding 90-degree elbow pipe after surface welding of inner wall of pipe billet of straight pipe |
| CN107052519A (en) * | 2017-04-10 | 2017-08-18 | 中国石油集团工程技术研究院 | A kind of nearly current potential stainless steel overlaying method of pre- repaired mouth solid solution transition of steel pipe weld bond |
| CN107775280A (en) * | 2016-08-29 | 2018-03-09 | 中国石油天然气集团公司 | A kind of manufacture method of N08825 nickel-base alloys composite-curve |
| CN112207516A (en) * | 2020-09-29 | 2021-01-12 | 苏州罗克莱堆焊科技有限公司 | Manufacturing process of surfacing composite elbow |
| CN112453652A (en) * | 2020-11-16 | 2021-03-09 | 四川石油天然气建设工程有限责任公司 | Hydrogen-containing mixed protective gas for welding corrosion-resistant alloy composite pipe and welding process thereof |
| CN112453641A (en) * | 2020-11-16 | 2021-03-09 | 四川石油天然气建设工程有限责任公司 | Saddle type branch pipe welding process of corrosion-resistant alloy composite pipe |
| CN114309127A (en) * | 2020-09-29 | 2022-04-12 | 郑州万达重工股份有限公司 | Inner wall surfacing small-bending-radius bent pipe and forming method thereof |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102950427A (en) * | 2012-10-19 | 2013-03-06 | 中国石油天然气第七建设公司 | Method for processing bent pipe with inner wall subjected to surfacing welding |
| CN103231224A (en) * | 2013-04-17 | 2013-08-07 | 二重集团（德阳）重型装备股份有限公司 | Method for molding 90-degree elbow pipe after surface welding of inner wall of pipe billet of straight pipe |
| CN103231224B (en) * | 2013-04-17 | 2015-09-23 | 二重集团（德阳）重型装备股份有限公司 | The method of straight tube tube blank inner wall built-up welding aftershaping 90 ° of bend pipes |
| CN107775280A (en) * | 2016-08-29 | 2018-03-09 | 中国石油天然气集团公司 | A kind of manufacture method of N08825 nickel-base alloys composite-curve |
| CN107775280B (en) * | 2016-08-29 | 2019-06-11 | 中国石油天然气集团公司 | A kind of manufacturing method of N08825 nickel-base alloy composite-curve |
| CN107052519A (en) * | 2017-04-10 | 2017-08-18 | 中国石油集团工程技术研究院 | A kind of nearly current potential stainless steel overlaying method of pre- repaired mouth solid solution transition of steel pipe weld bond |
| CN112207516A (en) * | 2020-09-29 | 2021-01-12 | 苏州罗克莱堆焊科技有限公司 | Manufacturing process of surfacing composite elbow |
| CN114309127A (en) * | 2020-09-29 | 2022-04-12 | 郑州万达重工股份有限公司 | Inner wall surfacing small-bending-radius bent pipe and forming method thereof |
| CN114309127B (en) * | 2020-09-29 | 2023-09-26 | 郑州万达重工股份有限公司 | Inner wall surfacing small bending radius bent pipe and forming method thereof |
| CN112453652A (en) * | 2020-11-16 | 2021-03-09 | 四川石油天然气建设工程有限责任公司 | Hydrogen-containing mixed protective gas for welding corrosion-resistant alloy composite pipe and welding process thereof |
| CN112453641A (en) * | 2020-11-16 | 2021-03-09 | 四川石油天然气建设工程有限责任公司 | Saddle type branch pipe welding process of corrosion-resistant alloy composite pipe |
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Application publication date: 20121017 |