CN102218648B - Machining method for large caliber stainless steel pipe - Google Patents
Machining method for large caliber stainless steel pipe Download PDFInfo
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Abstract
The invention discloses a machining method for a large caliber stainless steel pipe, belonging to the field of machining technology of large caliber steel pipe. The technical key point of technique is as follows: the machining method comprises a forming procedure, a welding procedure and a shaping procedure, wherein in the welding procedure, the argon arc welding, plasma arc welding and argon arc welding are sequentially adopted to the welding seam from inside to outside, wherein the welding procedure also comprises the submerged arc welding that is used after the second argon arc welding. The invention aims at providing the machining method for the large caliber stainless steel pipe with good welding seam effect and high intensity, and is used for machining the large caliber stainless steel pipe.
Description
Technical field
The present invention relates to a kind of processing method of steel pipe, more particularly, relate in particular to a kind of processing method of large-caliber stainless steel pipe.
Background technology
The seamed industrial pipe of large-caliber stainless steel is the good corrosion resistant plate of utility or stainless steel band through cutting, making after the technique such as moulding, welding, inside and outside welding bead processing, solution heat treatment, shaping.Through the seamed industry pipe of the stainless steel of novel process welding product good combination property, can be widely used in the industries such as oil, chemical industry, papermaking, sugaring, wine brewing, combustion gas, papermaking, the energy, drainage project, food and drink, have the very large market demand.
2009-2011, according to " equipment manufacture adjustment and development planning ", China carries with natural gas line and liquefaction accumulating field key project, take natural gas line conveying engineerings such as the second west to east gas pipeline project, capital, Shan three lines as support, and the equipments such as development long-distance transmission pipeline Compressor Set; Take Zhejiang, the liquefied natural gas receiving station engineering such as Jiangsu, Zhuhai, Qingdao is as support, develops the equipment such as large-scale liquified natural gas carrier (LNGC) and receiving station.2010, all kinds of line pipe annual requirements of China were about 4,000,000 tons.Wherein: the stainless steel tube consumption accounts for full pipeline ratio about 5% (estimating 17～200,000 tons).The oil gas conveying is about 5.7% with the share that the Large diameter stainless steel welding tube accounts for the domestic market.Aspect, international market, the particularly country such as American-European, stainless use is more ripe, and wherein annual requirement is 4000～5,000 ten thousand tons, and the heavy caliber welded tube then accounts for 15%-30%, and increases progressively by 8% speed year by year.
The production of present domestic stainless steel industry pipe arrangement mainly rests on the aspect of small size caliber; Be subjected to the restriction of the factors such as equipment and welding procedure, the stainless steel industry pipe arrangement production equipment of the above size of φ 219mm need to rely on import to satisfy the demands.Because import equipment purchase cost and maintenance cost are too expensive, at present domestic only have several families to have the ability to purchase.At present, when domestic straight seam pipemill is produced the above size steel pipe of φ 219mm, also there is following technical barrier:
1) transmission system is not good because transmission speed cooperates with speed of production and welding, affects production efficiency and yields;
2) profiled section control is bad, causes the out-of-roundness of ERW to be difficult to guarantee;
3) welding method, parameter is unreasonable and select power-supply system not to the time, be prone to during heavy caliber pipe more than throat thickness reaches 5.0mm that penetration is inhomogeneous, face of weld is uneven or the indent phenomenon.
To the weld seam of thick pipe, generally be to adopt TPT (argon arc welding+plasma weldering+argon arc welding) solder technology, this welding manner now, exist the commissure thin than body, the shortcoming that tensile strength is inadequate is if there is breakage, generally all be in the commissure, cause the undesirable of tube quality.
Summary of the invention
The object of the present invention is to provide the processing method of the large-caliber stainless steel pipe that a kind of weld seam is effective, intensity is high.
Technical scheme of the present invention is achieved in that a kind of processing method of large-caliber stainless steel pipe, the method mainly comprises molding procedure, welding sequence, trimming, described welding sequence is that butt welded seam sequentially adopts for the first time argon arc welding, plasma arc welding (PAW) and for the second time argon arc welding from the inside to the outside, wherein said welding sequence also comprises submerged-arc welding, and submerged-arc welding is used after the argon arc welding second time.
In the processing method of above-mentioned large-caliber stainless steel pipe, behind the described submerged-arc welding seam, the commissure wall thickness is not less than the thickness of material main body.
In the processing method of above-mentioned large-caliber stainless steel pipe, in the described argon arc welding first time, argon flow amount is 7～10L/min, and welding current is 90～110A, and arc voltage is 11.5～15.5U, and speed of welding is 30～60mm/min.
In the processing method of above-mentioned large-caliber stainless steel pipe, it is characterized in that, in the described argon arc welding second time, argon flow amount is 7～10L/min, and welding current is 180～200A, and arc voltage is 16～20U, and speed of welding is 30～60mm/min.
In the processing method of above-mentioned large-caliber stainless steel pipe, in the described plasma arc welding (PAW), argon, hydrogen gaseous mixture 4.5～5.5L/min, welding current is 275～305A, and arc voltage is 26～30U, and speed of welding is 30～60mm/min.
In the processing method of above-mentioned large-caliber stainless steel pipe, in the described submerged-arc welding, welding current is 190～200A, and arc voltage is 28～32U, and speed of welding is 30～60mm/min.
In the processing method of above-mentioned large-caliber stainless steel pipe, the described diameter of steel tube that processes is 426～630mm, and steel pipe thickness is 6～12mm.
After the present invention adopts said method, by solder technology basically at original TPT (argon arc welding+plasma weldering+argon arc welding), increase submerged-arc welding, so that the thickness of commissure is not less than the thickness of steel pipe body, can reach the performance of seamless pipe aspect the performance parameters such as welding bead tensile strength and yield strength, and can accomplish that weld seam reaches with the equal tensile strength of mother metal even surpasses.
The specific embodiment
The present invention is described in further detail below in conjunction with embodiment, but do not consist of any limitation of the invention.
The processing method of a kind of large-caliber stainless steel pipe of the present invention, the method mainly comprises molding procedure, welding sequence, trimming, described welding sequence is that butt welded seam sequentially adopts for the first time argon arc welding, plasma arc welding (PAW), for the second time argon arc welding and submerged-arc welding from the inside to the outside, behind the submerged-arc welding seam, the thickness that the commissure wall thickness is not less than material main body is wherein: in for the first time argon arc welding, argon flow amount is 7～10L/min, welding current is 90～110A, arc voltage is 11.5～15.5U, and speed of welding is 30～60mm/min; In for the second time argon arc welding, argon flow amount is 7～10L/min, and welding current is 180～200A, and arc voltage is 16～20U, and speed of welding is 30～60mm/min; In the plasma arc welding (PAW), argon, hydrogen gaseous mixture 4.5～5.5L/min, welding current is 275～305A, and arc voltage is 26～30U, and speed of welding is 30～60mm/min.; In the submerged-arc welding, welding current is 190～200A, and arc voltage is 28～32U, and speed of welding is 30～60mm/min; The diameter of steel tube that processes by said method is 426～630mm, and steel pipe thickness is 6～12mm.
Embodiment 1
The stainless steel tube of processing 426mm caliber
In for the first time argon arc welding, argon flow amount is 7～10L/min, and welding current is 90～110A, and arc voltage is 11.5～15.5U, and speed of welding is 30～60mm/min; In for the second time argon arc welding, argon flow amount is 7～10L/min, and welding current is 180～200A, and arc voltage is 16～20U, and speed of welding is 30～60mm/min; In the plasma arc welding (PAW), argon, hydrogen gaseous mixture 4.5～5.5L/min, welding current is 275～305A, and arc voltage is 26～30U, and speed of welding is 30～60mm/min; In the submerged-arc welding, welding current is 190～200A, and arc voltage is 28～32U, and speed of welding is 30～60mm/min.
Embodiment 2
The stainless steel tube of processing 457mm caliber
In for the first time argon arc welding, argon flow amount is 7～10L/min, and welding current is 100～120A, and arc voltage is 11.5～15.5U, and speed of welding is 30～50mm/min; In for the second time argon arc welding, argon flow amount is 7～10L/min, and welding current is 190～210A, and arc voltage is 16～20U, and speed of welding is 30～50mm/min; In the plasma arc welding (PAW), argon, hydrogen gaseous mixture 4.0～5.0L/min, welding current is 280～310A, and arc voltage is 26～30U, and speed of welding is 30～50mm/min; In the submerged-arc welding, welding current is 195～205A, and arc voltage is 28～32U, and speed of welding is 30～50mm/min.
Embodiment 3
The stainless steel tube of processing 508mm caliber
In for the first time argon arc welding, argon flow amount is 7～10L/min, and welding current is 90～110A, and arc voltage is 11.5～15.5U, and speed of welding is 30～50mm/min; In for the second time argon arc welding, argon flow amount is 7～10L/min, and welding current is 180～200A, and arc voltage is 17～21U, and speed of welding is 30～50mm/min; In the plasma arc welding (PAW), argon, hydrogen gaseous mixture 4.5～5.5L/min, welding current is 275～305A, and arc voltage is 26～30U, and speed of welding is 30～50mm/min; In the submerged-arc welding, welding current is 200～220A, and arc voltage is 30～34U, and speed of welding is 30～50mm/min.
Embodiment 4
The stainless steel tube of processing 558mm caliber
In for the first time argon arc welding, argon flow amount is 7～10L/min, and welding current is 90～110A, and arc voltage is 12～16U, and speed of welding is 30～50mm/min; In for the second time argon arc welding, argon flow amount is 7～10L/min, and welding current is 170～190A, and arc voltage is 16～20U, and speed of welding is 30～50mm/min; In the plasma arc welding (PAW), argon, hydrogen gaseous mixture 4.5～5.5L/min, welding current is 245～375A, and arc voltage is 26～30U, and speed of welding is 30～50mm/min; In the submerged-arc welding, welding current is 185～200A, and arc voltage is 26～30U, and speed of welding is 30～50mm/min.
Embodiment 5
The stainless steel tube of processing 630mm caliber
In for the first time argon arc welding, argon flow amount is 7～10L/min, and welding current is 90～110A, and arc voltage is 11.5～15.5U, and speed of welding is 30～50mm/min; In for the second time argon arc welding, argon flow amount is 7～10L/min, and welding current is 180～200A, and arc voltage is 17～21U, and speed of welding is 30～60mm/min; In the plasma arc welding (PAW), argon, hydrogen gaseous mixture 4.5～5.5L/min, welding current is 260～295A, and arc voltage is 25～29U, and speed of welding is 30～50mm/min; In the submerged-arc welding, welding current is 190～200A, and arc voltage is 28～32U, and speed of welding is 30～50mm/min.Numerical value among the embodiment is concrete numerical value, and scope needs in the above-mentioned scope that provides
Experimental example
The below provides the mechanical properties test report at the stainless steel tube place among five embodiment of the invention described above and the mechanical properties test report of the stainless steel seamless pipe randomly drawed, sees following table for details:
Table 1: the stainless steel welded pipe mechanical properties test report of this explained hereafter
| Numbering | Thickness mm | Pipe Trail mm | Tensile strength (welding bead) MPa | Surrender Strong degree MPa |
| Embodiment 1 | 6 | 426 | 670 | 345 |
| Embodiment 2 | 7 | 457 | 650 | 342 |
| Embodiment 3 | 9 | 508 | 667 | 339 |
| Embodiment 4 | 10 | 558 | 658 | 341 |
| Embodiment 5 | 12 | 630 | 686 | 336 |
Table 2: randomly draw the report of stainless steel seamless pipe mechanical properties test
| Numbering | Thickness mm | Pipe Trail mm | Tensile strength MPa | Surrender Strong degree MPa |
| 1 | 6 | 426 | 642 | 321 |
| 2 | 6.5 | 457 | 640 | 325 |
| 3 | 8 | 508 | 642 | 319 |
| 4 | 10 | 558 | 643 | 327 |
| 5 | 12 | 630 | 645 | 323 |
The stainless steel welding industry pipe arrangement wall thickness that the inventive method is produced is even, surface quality good, production cost is low, can reach the performance of seamless pipe aspect the performance parameters such as welding bead tensile strength and yield strength, and can accomplish that weld seam reaches with the equal tensile strength of mother metal even surpasses.
Claims (2)
1. the processing method of a large-caliber stainless steel pipe, the method mainly comprises molding procedure, welding sequence, trimming, described welding sequence is that butt welded seam sequentially adopts for the first time argon arc welding, plasma arc welding (PAW) and for the second time argon arc welding from the inside to the outside, it is characterized in that, described welding sequence also comprises submerged-arc welding, and submerged-arc welding is used after the argon arc welding second time; Behind the described submerged-arc welding seam, the commissure wall thickness is not less than the thickness of material main body; In the described argon arc welding first time, argon flow amount is 7～10L/min, and welding current is 90～110A, and arc voltage is 12～16U, and speed of welding is 30～60mm/min; In the described argon arc welding second time, argon flow amount is 7～10L/min, and welding current is 180～200A, and arc voltage is 16～20U, and speed of welding is 30～60mm/min; In the described plasma arc welding (PAW), argon, hydrogen gaseous mixture 4.5～5.5L/min, welding current is 275～305A, and arc voltage is 26～30U, and speed of welding is 30～60mm/min; In the described submerged-arc welding, welding current is 190～200A, and arc voltage is 28～32U, and speed of welding is 30～60mm/min.
2. the processing method of large-caliber stainless steel pipe according to claim 1 is characterized in that, the described diameter of steel tube that processes is 426～630mm, and steel pipe thickness is 6～12mm.
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| CN 201110168400 CN102218648B (en) | 2011-06-21 | 2011-06-21 | Machining method for large caliber stainless steel pipe |
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| CN102218648B true CN102218648B (en) | 2013-04-10 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102501033A (en) * | 2011-12-15 | 2012-06-20 | 广东金瑞不锈钢有限公司 | Parallel extrusion automatic coiling production process for stainless steel section pipe |
| CN103551750B (en) * | 2013-10-21 | 2015-11-18 | 番禺珠江钢管（珠海）有限公司 | Welded tube and manufacture method thereof |
| CN112077538A (en) * | 2020-09-04 | 2020-12-15 | 江苏武进不锈股份有限公司 | Preparation process of stainless steel welded pipe for marine oil and gas transmission |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101559446A (en) * | 2009-05-25 | 2009-10-21 | 广州永大不锈钢有限公司 | Method for preparing welded stainless steel pipe of boiler |
| CN101700599A (en) * | 2009-11-17 | 2010-05-05 | 郑州华电金源管道有限公司 | Submerged automatic arc welding method of SA335P91 steel |
| CN101985190A (en) * | 2010-12-08 | 2011-03-16 | 西安优耐特容器制造有限公司 | Method for welding steel substrate layers of zirconium steel compound slabs |
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| JPS61142025A (en) * | 1984-12-11 | 1986-06-28 | Kato Hatsujo Kaisha Ltd | Preparation of clamp made of shape memory alloy |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101559446A (en) * | 2009-05-25 | 2009-10-21 | 广州永大不锈钢有限公司 | Method for preparing welded stainless steel pipe of boiler |
| CN101700599A (en) * | 2009-11-17 | 2010-05-05 | 郑州华电金源管道有限公司 | Submerged automatic arc welding method of SA335P91 steel |
| CN101985190A (en) * | 2010-12-08 | 2011-03-16 | 西安优耐特容器制造有限公司 | Method for welding steel substrate layers of zirconium steel compound slabs |
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| JP昭61-142025A 1986.06.28 |
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