CN108857137B - Gas shield welding wire for high-strength continuous pipe - Google Patents
Gas shield welding wire for high-strength continuous pipe Download PDFInfo
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- CN108857137B CN108857137B CN201810696604.2A CN201810696604A CN108857137B CN 108857137 B CN108857137 B CN 108857137B CN 201810696604 A CN201810696604 A CN 201810696604A CN 108857137 B CN108857137 B CN 108857137B
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Classifications
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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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
- B23K35/3066—Fe as the principal constituent with Ni as next major constituent
-
- 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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0222—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in soldering, brazing
- B23K35/0227—Rods, wires
-
- 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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/40—Making wire or rods for soldering or welding
-
- 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
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
Abstract
The invention discloses a gas-shielded welding wire for a high-strength continuous pipe, which comprises the following chemical components in percentage by mass: c: 0.04-0.08%; si: 0.25 to 0.45 percent; mn: 0.8 to 1.6 percent; p: less than or equal to 0.008 percent; s: less than or equal to 0.005 percent; cu: 0.1 to 0.3 percent; cr: 0.6-1.2%; ni: 1 to 3 percent; ti: 0.05-0.15%, and the balance of Fe and inevitable impurities. Pure argon or mixed gas is used as protective gas, and the tensile strength R of the welding wire deposited metalmThe steel strip is more than or equal to 880Mpa, the yield strength is more than or equal to 810Mpa, the elongation is more than or equal to 14 percent, the hardness is less than or equal to 333HV, the Charpy toughness impact value at minus 30 ℃ is more than or equal to 85J, and the steel strip butt joint and the pipe butt joint on the operation site are suitable for the high-strength continuous pipe with the yield strength of 110-plus-130 ksi in the production process.
Description
The technical field is as follows:
the invention relates to the technical field of welding, in particular to a gas shielded welding wire for a high-strength continuous pipe with yield strength of 110-.
Background art:
a Coiled Tubing (CT) is an oil-gas Tubing which is wound on a reel and can be continuously put in or taken out from an oil well, has the length of thousands of meters, and can replace a conventional threaded connection oil pipe to carry out a plurality of operations. The coiled tubing plays an increasingly important role in the exploration and development of oil and gas fields, and is widely applied to the fields of oil field well repair, well drilling, well completion, well logging, oil extraction, gas production and the like.
Along with the continuous deep development of the petroleum and natural gas industry in China, the proportion of unconventional oil and gas resources such as deep oil and gas resources and shale gas is increased day by day, and a plurality of oil and gas well engineering problems are shown. The method mainly comprises the following steps: 1) some regional oil and gas wells integrate deep wells, high pressure and high temperature; 2) in order to improve the oil and gas exploitation efficiency, a large number of horizontal wells are adopted at home and abroad, and the length of a horizontal section is increased; 3) the use of the coiled tubing with large pipe diameter, high steel grade and large length is increased, the transportation limitation is caused, the length of the single-disk coiled tubing with large pipe diameter cannot meet the requirement of field operation, and the 2 disks of coiled tubing need to be subjected to pipe-pipe girth welding and butt joint in the operation field. Therefore, higher requirements are provided for the strength, the internal and external pressure bearing capacity and the fatigue performance of the continuous pipe, and the high-strength continuous pipe with the yield strength of 110ksi and above 110ksi is required to meet the operation requirement.
The length of a single continuous tube product is thousands of meters, strip steel butt joint must be firstly carried out in the production process, so that the strip steel has enough length, and the plate butt joint method generally needs a gas shielded welding wire. Similarly, the gas shielded welding wire is also needed when the continuous pipe is subjected to pipe-to-pipe butt welding. Due to the particularity of the operation mode and the working environment of the continuous pipe, the quality of a welding joint has an important influence on the service safety of the continuous pipe, and the special welding wire for the continuous pipe is of great importance for ensuring the quality of the welding joint. The high-strength gas shielded welding wire for the continuous pipe disclosed in the Chinese patent CN101134274A is suitable for the butt joint of a plate and a pipe in the production and operation field of the continuous pipe with the yield strength of 500-560MPa and the tensile strength of 550-630MPa, but the strength of the welding wire in the patent is low, and the butt joint of a steel strip in the production process of the high-strength continuous pipe with the yield strength of more than 110ksi and the pipe-pipe girth welding in the operation field cannot be met. A solid wire for gas shielded arc welding named high-strength steel with application number 201310248542.6, which is suitable for 780MPa grade high-strength steel and has good low-temperature toughness. The special welding wire for the high-strength continuous pipe is different from the welding wire and is designed aiming at the production of the continuous pipe and the butt joint application of the on-site pipe.
The invention content is as follows:
the invention aims to provide a gas-shielded welding wire for a high-strength continuous pipe, which is suitable for butt joint of steel belts and pipe pipes on an operation site in the production process of the high-strength continuous pipe with the yield strength of 110-.
In order to achieve the purpose, the invention adopts the technical scheme that: a gas shield welding wire for a high-strength continuous pipe comprises the following chemical components in percentage by mass: c: 0.04-0.08%; si: 0.25 to 0.45 percent; mn: 0.8 to 1.6 percent; p: less than or equal to 0.008 percent; s: less than or equal to 0.005 percent; cu: 0.1 to 0.3 percent; cr: 0.6-1.2%; ni: 1 to 3 percent; ti: 0.05-0.15%, and the balance of Fe and inevitable impurities.
The reasons for the addition of elements in the wire and weld metal are detailed below:
c: more than 0.04% and less than 0.08%
Carbon (C) has a large influence on the strength and toughness of the weld as a main strengthening element in the weld structure. When the C content is low, the weld strength is low, so the C content is not suitable to be too low, but when the C content is too high, the plasticity and the toughness of the steel are reduced, the weldability is deteriorated, the cold cracking tendency is increased, and therefore the C content is not suitable to be too high. In order to ensure good welding performance and achieve better strong plasticity matching, the design range of C is 0.04-0.08%.
Si: more than 0.25 percent and less than 0.45 percent
Silicon (Si) is an indispensable element in gas shielded welding wires and weld metals. One is deoxidation elements in the weld metal, the other is to improve the strength of the weld metal through solid solution strengthening, and the other is to improve the fluidity of the weld metal. However, Si content exceeding 0.6% affects the toughness of the welded joint, and is limited to 0.25 to 0.45%.
Mn: more than 0.8 percent and less than 1.6 percent
Manganese (Mn) has good deoxidation and desulfurization effects, is a good solid-solution strengthening element, can make up for the insufficient strength caused by the reduction of carbon content, and improves the strength and hardenability of a welding seam. However, when Mn is more than 2.0%, a hardened structure is easily formed in the weld, resulting in a decrease in weld toughness and an increase in crack sensitivity of the weld, so that the Mn content is preferably 0.8 to 1.6%.
P: less than 0.008%
Phosphorus (P) is an impurity element that reduces the plasticity and toughness of the weld metal while increasing the susceptibility of weld hot cracks. In the invention, the content of P is controlled to be below 0.008 percent by optimizing the metallurgical process.
S: less than 0.005%
Sulfur (S) is an extremely harmful element, and a low-melting-point compound is easily generated during welding, and is a main cause of the heat of the weld, and is also extremely unfavorable for the toughness of the weld metal, so that the content of S is preferably as small as possible, and the content of S in the present invention is controlled to 0.005% or less.
Cu: more than 0.1 percent and less than 0.3 percent
Copper (Cu) can improve the strength and toughness of welding seams and improve the corrosion resistance, especially the atmospheric corrosion resistance. However, when the Cu content exceeds 0.5%, the plasticity is obviously reduced, the hot brittleness of the welding seam is increased when the Cu content is too high, and the design range of the Cu is 0.1-0.3%.
Cr: more than 0.6 percent and less than 1.2 percent
Chromium (Cr) has a remarkable solid solution strengthening effect, can make up for strength reduction caused by C, Mn reduction, and improves the tensile strength of weld metal; meanwhile, Cr can improve the corrosion resistance of a welded joint after welding, but when the content is high, a hardening structure is easy to generate, the chemical composition of the base metal of the high-strength continuous tube is comprehensively considered, and the design range of Cr is 0.6-1.2%.
Ni: more than 1 percent and less than 3 percent
Nickel (Ni) can improve the strength of a welding seam through grain refinement and solid solution strengthening, can keep good plasticity and toughness, improves the resistance to fatigue and reduces the sensitivity to a notch. However, too high Ni content may reduce the fluidity of the welding seam technique, which is not favorable for welding formation and may cause defects such as welding seam slag inclusion and porosity. The design range of Ni in the invention is 1-3%.
Ti: more than 0.05 percent and less than 0.15 percent
Titanium (Ti) is a strong deoxidizer and a denitrifier, and a proper amount of Ti can form fine, insoluble and dispersed compound (TiO, TiN) particles in a welding line, promote acicular ferrite nucleation, refine welding line tissues and effectively increase the strength and toughness of the welding line. However, too high Ti content may reduce the toughness of the weld, and may make the molten steel viscous, which is not conducive to the continuous casting process of steel making. The design range of Ti of the present invention is 0.05-0.15% considering the burning loss during welding.
The invention has the beneficial effects that:
1. the welding wire is matched with a high-strength coiled pipe plate to carry out steel belt butt welding or pipe-pipe butt welding, and the obtained welding seam performance is as follows: tensile strength R of the weldmNot less than 950 MPa; the structure of the welding seam area is a multiphase structure of acicular ferrite, acicular bainite, martensite and residual austenite, and the hardness of the welding seam is less than or equal to 345 HV.
2. Mechanical properties of deposited metal test: pure argon or mixed gas is used as protective gas, and the tensile strength R of the welding wire deposited metalmNot less than 880Mpa, yield strength not less than 810Mpa, elongation not less than 14%, hardness not more than 333HV, Charpy toughness impact value not less than 85J at-30 ℃.
3. The welding wire is suitable for high-strength continuous pipes with yield strength of 110-130ksi, steel belt butt joint in the manufacturing process and pipe-pipe girth welding butt joint in an operation field, and has certain toughness and technological properties while ensuring the metal strength of a welding seam, so that the integral pressure-bearing and fatigue-resisting performance of the pipe is met.
The specific implementation mode is as follows:
the present invention will be described in further detail with reference to specific examples.
According to the chemical components of the designed welding wire, molten steel with the components meeting the requirements is smelted, the molten steel is cast into a continuous casting billet through protection, then the continuous casting billet is placed into a heating furnace for heating, and is rolled into a wire rod with the diameter of 3-6mm through a high-speed non-torsion rolling mill, and the wire rod is peeled, pickled, drawn and plated with copper to prepare a finished welding wire with the diameter of 0.8-1.6 mm.
Example 1:
the gas shielded welding wire with the diameter of 1.2mm is prepared by the method, the components of the welding wire are shown in table 1 through analysis, and the mechanical properties of the welding wire deposited metal test are shown in table 2.
TABLE 1 chemical composition of gas shielded welding wire with diameter of 1.2mm
TABLE 2 deposited metal test mechanical properties of gas shielded welding wire with diameter of 1.2mm
The welding wire is used for butt welding of steel-grade continuous pipes with yield strength of 110ksi and has good technological properties. The welding process is protected by pure argon or mixed gas, the welding quality is stable, and welding defects such as undercut, air holes and the like are not easy to occur due to regular welding beads. The tensile property, the bending property and the hardness of the butt-welding seam of the steel strip all meet the production requirements.
Example 2:
the gas shielded welding wire with the diameter of 1.0mm is prepared by the method, the components of the welding wire are shown in table 3 through analysis, and the mechanical properties of the welding wire deposited metal test are shown in table 4.
TABLE 3 chemical composition of 1.0mm diameter gas shielded welding wire
TABLE 4 deposited metal test mechanical properties of 1.2mm diameter gas shield welding wire
The welding wire is used for full-position automatic welding pipe-pipe butt joint of a steel-grade continuous pipe with yield strength of 130ksi, and has good technological performance. Pure argon is used for welding protection in the welding process, multi-layer and multi-path wire filling welding is carried out, the number of welding layers is adjusted according to the wall thickness and the specification of the continuous tube, and after special process treatment after welding, the welding seam performance meets the requirement of field operation, and the welding seam has stable quality and good repeatability.
Claims (3)
1. The utility model provides a high strength is gas shield welding wire for continuous pipe which characterized in that: the gas shield welding wire comprises the following chemical components in percentage by mass: c: 0.04-0.08%; si: 0.25 to 0.45 percent; mn: 0.8 to 1.6 percent; p: less than or equal to 0.008 percent; s: less than or equal to 0.005 percent; cu: 0.1 to 0.3 percent; cr: 0.6-1.2%; ni: 1 to 3 percent; ti: 0.05-0.15%, and the balance of Fe and inevitable impurities; pure argon or mixed gas is used as protective gas, and the tensile strength R of the welding wire deposited metalmNot less than 880Mpa, yield strength not less than 810Mpa, elongation not less than 14%, hardness not more than 333HV, Charpy toughness impact value not less than 85J at-30 ℃.
2. The gas-shielded welding wire for a high-strength continuous pipe according to claim 1, wherein: the welding wire is matched with a high-strength coiled pipe plate to carry out steel strip butt welding or pipe-pipe butt welding, and the tensile strength R of a welding linemNot less than 950MPa, the structure of the welding seam area is a multiphase structure of acicular ferrite, acicular bainite, martensite and residual austenite, and the welding seam hardness is not more than 345 HV.
3. The gas-shielded welding wire for a high-strength continuous pipe according to claim 1, wherein: the chemical components are smelted into molten steel, the molten steel is cast into a continuous casting billet in a protective mode, then the continuous casting billet is placed into a heating furnace for heating, and is rolled into a wire rod with the diameter of 3-6mm through a high-speed non-torsion rolling mill, and the wire rod is peeled, pickled, drawn and plated with copper to be made into a welding wire with the diameter of 0.8-1.6 mm.
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CN112756844A (en) * | 2019-10-21 | 2021-05-07 | 宝山钢铁股份有限公司 | Wire rod for high-weather-resistance low-strength gas shielded welding wire and welding wire |
CN113681198A (en) * | 2020-05-18 | 2021-11-23 | 宝山钢铁股份有限公司 | High resistant wire rod and welding wire for gas shielded welding wire that wait for height and splash |
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