CN112475787B - Preparation method of large-wall-thickness stainless steel/carbon steel laminated structure composite pipe - Google Patents
Preparation method of large-wall-thickness stainless steel/carbon steel laminated structure composite pipe Download PDFInfo
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- CN112475787B CN112475787B CN202011139486.9A CN202011139486A CN112475787B CN 112475787 B CN112475787 B CN 112475787B CN 202011139486 A CN202011139486 A CN 202011139486A CN 112475787 B CN112475787 B CN 112475787B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/21—Bonding by welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/346—Working by laser beam, e.g. welding, cutting or boring in combination with welding or cutting covered by groups B23K5/00 - B23K25/00, e.g. in combination with resistance welding
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/152—Water filtration
Abstract
The invention discloses a preparation method of a large-wall-thickness stainless steel/carbon steel laminated structure composite pipe, which is implemented according to the following steps: 1. preparing a layered structure metallurgy composite board by a stainless steel layer and a carbon steel layer in a vacuum seal welding, hot rolling and continuous controlled rolling and controlled cooling mode; 2. carrying out crevasse processing on the metallurgical composite board obtained in the step 1; 3. manufacturing the metallurgical composite board subjected to the crevasse processing in the step 2 into a tubular shape; 4. welding at the corresponding broken opening by adopting a laser and cold metal transition composite welding and submerged arc automatic welding process method to manufacture the stainless steel/carbon steel laminated structure composite pipe with large wall thickness, wherein inert gas protection is carried out on a stainless steel layer welding seam molten pool within the range of 250mm in length and 20mm in width in the welding process, the width of the stainless steel layer welding seam cladding metal is 5-10 mm, the width of the carbon steel layer welding seam cladding metal is 10-30 mm, and the rest height is 1-3 mm. The efficiency of preparing the composite pipe by the method is higher, and the obtained composite pipe has better weld performance.
Description
Technical Field
The invention belongs to the technical field of composite pipe preparation, and relates to a preparation method of a large-wall-thickness stainless steel/carbon steel laminated structure composite pipe.
Background
The metallurgical composite pipe with the stainless steel/carbon steel laminated structure has excellent interface bonding strength and comprehensive mechanical property, and can avoid quality problems of layering, collapse and the like; most importantly, the inner layer stainless steel has excellent corrosion resistance, can be safely used in general acidic environment, can meet the storage and transportation requirements of corrosive media, realizes the advantage complementation of materials to the maximum extent, obviously reduces the pipeline construction cost, improves the corrosion resistance and the safety and the reliability of the pipeline, and has great market value and economic benefit in various fields.
For example, in urban drinking water, due to the corrosive problem of the conveying pipe, secondary pollution to the quality of drinking water is easily caused, yellow water, black water and other phenomena appear, and the health of citizens is seriously affected, so that the latest sanitary standard of drinking water and the urban water supply engineering planning standard which are comprehensively implemented in China put forward new requirements on the quality of drinking water in cities and the construction planning of pipe network engineering, and the municipal pipe network construction and the reconstruction and updating work are promoted to be developed quickly. The development and application of the stainless steel/carbon steel layered structure metallurgical composite pipe can powerfully guarantee the high quality of the drinking water, and can effectively solve the problem of supplying the high quality drinking water for the development of super big cities in China. For the construction of urban water supply and drainage pipe network engineering, the stainless steel/carbon steel layered structure metallurgical composite pipe is a novel life-saving water supply pipe and has the advantages of internal corrosion resistance, long service life, safe and reliable operation and the like. In addition, in the field of energy and chemical engineering, the development and application of the stainless steel/carbon steel laminated structure metallurgical composite pipe can well solve the problems of corrosion failure of storage and transportation equipment and the like in the exploitation, gathering and refining of acid oil and gas field energy in China, and provide support for national oil and gas exploitation and pipe network construction.
At present, for the production and preparation of large-wall-thickness stainless steel/carbon steel laminated structure composite pipes in the pipe making industry, TIG (tungsten inert gas) and SAW (surface acoustic wave) methods are mostly adopted, namely SAW welding of a carbon steel layer and TIG welding of a stainless steel layer, the welding method is single, the welding process adaptability is poor, the welding quality is unstable, the performance of a welding seam is mostly deteriorated due to heat accumulation, and the toughness performance and the intergranular corrosion resistance of the welding seam are particularly reflected on. For example, for the welding production and preparation of a large-wall-thickness N08825/X65 phi 610mm multiplied by (3+17.5) mm multiplied by 8000mm austenitic stainless steel/carbon steel laminated structure composite pipe, the steel layer of the pipeline adopts SAW welding, the composite layer stainless steel adopts TIG welding, the lower TIG welding efficiency (the average welding speed is 80-120 mm/min) seriously restricts the production and preparation of the composite pipe, and the 8500mm pipe only needs about 1.5 days for welding.
Disclosure of Invention
The invention aims to provide a preparation method of a large-wall-thickness stainless steel/carbon steel laminated structure composite pipe, which solves the problems of low welding efficiency and poor welding seam quality and performance in the prior art.
The technical scheme adopted by the invention is that the preparation method of the stainless steel/carbon steel laminated structure composite pipe with large wall thickness is characterized by comprising the following steps:
step 3, manufacturing the metallurgical composite board subjected to the crevasse processing in the step 2 into a tubular shape;
and 4, welding at the corresponding broken opening by adopting laser cooling metal transition composite welding and automatic submerged arc welding (SAW welding) to prepare the stainless steel/carbon steel laminated structure composite pipe with large wall thickness, wherein inert gas protection is carried out on a stainless steel layer welding seam molten pool within the range of 250mm long and 20mm wide in the welding process, the width of the stainless steel layer welding seam cladding metal is 5-10 mm, the width of the carbon steel layer welding seam cladding metal is 10-30 mm, and the rest height is 1-3 mm.
The invention is also characterized in that:
the stainless steel layer in the step 1 is 304, 304L, 316L, N08825, N06625 austenitic stainless steel or 3RE60, SAF2304, SAF2205 ferrite-austenite duplex stainless steel or AISI442, 443, 446 ferritic stainless steel.
The thickness of the stainless steel layer in the step 1 is 1-4 mm.
The carbon steel layer in the step 1 is Q235, Q345, X52, X60, X65, X70, X80, X90 or X100 carbon structural steel, pressure vessel steel or high-strength high-toughness pipeline steel.
The step 2 of groove processing of the large-wall-thickness metallurgical composite plate specifically comprises the following steps: and (3) performing I + V groove machining on two longitudinal edges of the composite board.
The processing parameters of the I + V-shaped groove are as follows: the V-shaped groove is located on one side of the carbon steel layer, the depth of the V-shaped groove is 0-24 mm, the included angle of the V-shaped groove is 60-80 degrees, the width of the outer edge of the V-shaped groove is 10-28 mm, and the I-shaped groove is located on one side of the stainless steel layer and the depth of the I-shaped groove is 10-26 mm.
The step 3 specifically comprises the following steps: and forming the tube by adopting a multi-pass progressive pressing method, wherein the stainless steel layer is arranged on the inner side of the tube, and the carbon steel layer is arranged on the outer side of the tube.
The step 4 specifically comprises the following steps: welding is carried out from one side of the stainless steel layer by adopting a laser cooling metal transition composite welding technology, and after the inner welding is finished and the stainless steel layer weld cladding metal is formed, welding is carried out from one side of the carbon steel layer by adopting automatic submerged arc welding, so as to form the carbon steel layer weld cladding metal.
Selection of cold metal transition welding material
The welding wire of ER309L, the submerged arc automatic welding material is H08E, and the welding flux is SJ 101G.
The invention has the beneficial effects that: according to the invention, a laser and cold metal transition composite welding method is adopted, and for welding of one side of a stainless steel layer, one-time penetration welding forming can be realized, multiple filling of the traditional welding method (TIG welding) is avoided, the welding efficiency is greatly improved, heat accumulation can be obviously reduced, the production preparation efficiency of the composite pipe is multiplied, and the quality and performance of a welding seam are also obviously improved;
the invention provides the optimal welding preparation method aiming at the welding production of the large-wall-thickness stainless steel/carbon steel laminated structure composite pipe, and the method has stronger practicability and wider application range.
Drawings
FIG. 1 is a schematic structural view of a composite pipe made by the present invention;
FIG. 2 is a graph comparing impact toughness performance at 10 ℃ of a composite pipe weld joint prepared by the method of the invention and a weld joint of a composite pipe obtained by a traditional method of argon tungsten-arc welding and submerged arc automatic welding;
FIG. 3 is a comparison graph of welding production efficiency of the method of the present invention and the conventional method of argon tungsten-arc welding and automatic submerged arc welding for producing stainless steel/carbon steel composite pipes of the same specification and material and with large wall thickness.
Wherein 1 is a carbon steel layer; 2 is a stainless steel layer; 3, cladding metal on the stainless steel layer by welding seams; 4, cladding metal of the weld joint of the carbon steel layer.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The preparation method of the large-wall-thickness stainless steel/carbon steel laminated structure composite pipe is implemented according to the following steps:
step 1: preparing a layered structure metallurgical composite plate by a stainless steel layer 1 and a carbon steel layer 2 through vacuum seal welding, hot rolling and continuous controlled rolling and controlled cooling, wherein the stainless steel layer 2 is 304, 304L, 316L, N08825, N06625 austenitic stainless steel or 3RE60, SAF2304, SAF2205 ferrite-austenite duplex stainless steel or AISI442, 443 and 446 ferrite stainless steel, the thickness of the stainless steel layer 2 is 1-4 mm, and the carbon steel layer 1 is Q235, Q345, X52, X60, X65, X70, X80, X90 or X100 structural steel, pressure vessel steel or high strength and toughness pipeline steel;
step 2: performing crevasse processing on the large-wall-thickness metallurgical composite plate obtained in the step 1, and specifically: carrying out I + V type groove processing on two longitudinal edges of the composite board, wherein the groove processing parameters are as follows: the V-shaped groove is located on one side of the carbon steel layer, the depth of the V-shaped groove is 0-24 mm, the included angle of the V-shaped groove is 60-80 degrees, the width of the outer edge of the V-shaped groove is 10-28 mm, and the I-shaped groove is located on one side of the stainless steel layer and the depth of the I-shaped groove is 10-26 mm.
And step 3: pressing the metallurgical composite plate subjected to groove processing in the step 2 into a tubular shape by adopting a multi-pass progressive pressing method, wherein the stainless steel layer is arranged on the inner side of the tube, and the carbon steel layer is arranged on the outer side of the tube;
and 4, step 4: welding at the corresponding broken opening by adopting a laser and cold metal transition composite welding and submerged arc automatic welding method to manufacture a stainless steel/carbon steel laminated structure composite pipe with large wall thickness, wherein inert gas protection is carried out on a stainless steel layer welding seam molten pool within the ranges of 250mm long and 20mm wide in the welding process, the width of the stainless steel layer welding seam cladding metal is 5-10 mm, the width of the carbon steel layer welding seam cladding metal is 10-30 mm, the rest height is 1-3 mm, and the welding process specifically comprises the following steps: welding from one side of the stainless steel layer by adopting a laser and cold metal transition composite welding technology, and after the formation of the stainless steel layer weld cladding metal 3 is finished by the inner welding, welding from one side of the carbon steel layer by adopting automatic submerged arc welding to form the carbon steel layer weld cladding metal 4; wherein, the cold metal transition welding material is selected
The welding wire of ER309L, the submerged arc automatic welding material is H08E, and the welding flux is SJ 101G.
Specific examples
Referring to fig. 1, a 2205/X65 large-wall-thickness stainless steel/pipeline steel layered structure composite plate with a wall thickness of 28mm, which is prepared by a vacuum seal welding, hot rolling and continuous controlled rolling and controlled cooling technology, is taken as an experimental raw material plate, the thickness of the 2205 stainless steel layer is 3mm, the thickness of the X65 pipeline steel layer is 25mm, after impurities, rust and hard blocks on the two sides of the plate are cleaned, the phi 610 × 28mm 2205/X65 stainless steel/pipeline steel layered structure composite pipe is manufactured, and the specific steps are as follows in sequence:
step 1: carrying out milling processing on an I + V-shaped groove on two longitudinal sides of a 2205/X65 large-wall-thickness stainless steel/pipeline steel laminated structure composite plate, and carrying out surface cleaning again within a range of 10-20 mm on two sides of the groove, wherein the specific parameters of the groove processing are as follows: the V-shaped groove is positioned on one side of the carbon steel layer, the depth is 12mm, the included angle of the groove is 60 degrees, the width of the outer edge of the groove is 16mm, and the I-shaped groove is positioned on one side of the stainless steel layer and the depth is 16 mm;
step 2: pressing into a tubular shape by adopting a progressive pressing method, wherein the gap of a groove is 0, welding from one side of a stainless steel layer, namely the inside of the tubular product, by adopting a laser and cold metal transition composite welding technology, and welding from an external carbon steel layer by adopting a submerged arc automatic welding method after finishing the formation of the stainless steel layer weld cladding metal to form the carbon steel layer weld cladding metal. In the welding process, inert gas protection is carried out on the stainless steel layer welding seam in the range of 250mm long and 20mm wide;
selection of cold metal transition welding material
ER309L welding wire; H08E is selected as the welding material of the submerged-arc automatic welding, and SJ101G is selected as the welding flux.
The welding process parameters are shown in tables 1 and 2 below, and the weld properties are shown in table 3 below:
TABLE 1 laser + Cold Metal transition hybrid welding parameters
TABLE 2 welding parameters for submerged automatic arc welding
TABLE 32205/X65 test results of weld performance of stainless steel/pipeline steel laminated structure composite pipe
For the welding production and preparation of the N08825/X65 phi 610X (3+17.5) mm austenitic stainless steel/pipeline steel laminated structure composite pipe, different welding process schemes and methods have serious influence on the quality of the welding seam of the composite pipe and the welding production efficiency. FIG. 2 shows the comparative conditions of impact toughness performance of a weld joint at 10 ℃ when a N08825/X65 phi 610mm multiplied by (3+17.5) mm multiplied by 8000mm laminated structure composite pipe is produced by welding by adopting the method of the invention and the traditional argon tungsten-arc welding and submerged arc automatic welding process schemes respectively; fig. 3 shows a comparison of the welding productivity of the method of the present invention and the conventional method. It is apparent from fig. 2 and fig. 3 that the N08825/X65 Φ 610 × (3+17.5) mm austenitic stainless steel/pipeline steel laminated structure composite pipe weld joint produced by welding according to the method of the present invention has significantly better impact toughness performance and higher welding production efficiency.
Claims (5)
1. The preparation method of the large-wall-thickness stainless steel/carbon steel laminated structure composite pipe is characterized by comprising the following steps of:
step 1, preparing a layered structure metallurgical composite plate from a stainless steel layer and a carbon steel layer in a vacuum seal welding, hot rolling and continuous rolling and cooling control mode;
step 2, performing groove machining on the metallurgical composite plate obtained in the step 1; the step 2 of groove processing of the large-wall-thickness metallurgical composite plate specifically comprises the following steps: processing an I + V-shaped groove on two longitudinal edges of the composite plate, wherein the processing parameters of the I + V-shaped groove are as follows: the V-shaped groove is located on one side of the carbon steel layer, the depth of the V-shaped groove is 0-24 mm, the included angle of the groove is 60-80 degrees, the width of the outer edge of the groove is 10-28 mm, and the I-shaped groove is located on one side of the stainless steel layer and the depth of the I-shaped groove is 10-26 mm;
step 3, manufacturing the metallurgical composite plate subjected to groove processing in the step 2 into a tubular shape, and manufacturing the metallurgical composite plate into the tubular shape by adopting a multi-pass progressive pressing method, wherein the stainless steel layer is arranged on the inner side of the tube, and the carbon steel layer is arranged on the outer side of the tube;
and 4, welding from one side of the stainless steel layer by adopting a laser cooling metal transition composite welding technology, welding from one side of the carbon steel layer by adopting automatic submerged arc welding after the inner welding is finished and the weld cladding metal of the stainless steel layer is formed, forming the carbon steel weld cladding metal, and preparing the stainless steel/carbon steel laminated structure composite pipe with the large wall thickness, wherein inert gas protection is carried out on the stainless steel layer weld pool within the ranges of 250mm long and 20mm wide in the welding process, the width of the stainless steel layer weld cladding metal is 5-10 mm, the width of the carbon steel layer weld cladding metal is 10-30 mm, and the rest height is 1-3 mm.
2. The method for preparing the large-wall-thickness stainless steel/carbon steel laminated structure composite pipe material according to claim 1, wherein the stainless steel layer in the step 1 is 304, 304L, 316L, N08825, N06625 austenitic stainless steel or 3RE60, SAF2304, SAF2205 ferrite-austenite duplex stainless steel or AISI442, 443, 446 ferritic stainless steel.
3. The method for preparing the large-wall-thickness stainless steel/carbon steel laminated structure composite pipe according to claim 1, wherein the thickness of the stainless steel layer in the step 1 is 1-4 mm.
4. The method for preparing the large-wall-thickness stainless steel/carbon steel laminated structure composite pipe material according to claim 1, wherein the carbon steel layer in the step 1 is Q235, Q345, X52, X60, X65, X70, X80, X90 or X100 carbon structural steel, pressure vessel steel or high-strength high-toughness pipeline steel.
5. The method for preparing the composite pipe with the large wall thickness and the stainless steel/carbon steel laminated structure according to claim 1, wherein the cold metal transition welding material is selected from
The welding wire of ER309L, the submerged-arc automatic welding material adopts H08E welding wire and SJ101G welding flux.
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| CN113458549B (en) * | 2021-07-01 | 2023-01-24 | 陕西铁路工程职业技术学院 | Preparation method of composite pipe based on spraying technology |
| CN115958387B (en) * | 2022-11-28 | 2023-11-07 | 南京首勤特种材料有限公司 | Preparation method of stainless steel composite board, product and application thereof |
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