CN117620514A - High corrosion resistant gas shielded welding wire capable of bearing 10-30kJ/cm heat input - Google Patents
High corrosion resistant gas shielded welding wire capable of bearing 10-30kJ/cm heat input Download PDFInfo
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Abstract
A high corrosion resistant gas shielded welding wire capable of bearing 10-30kJ/cm heat input belongs to the field of special welding materials, and comprises the following chemical components in percentage by mass: 0.04-0.10% of C, 0.20-0.60% of Si, 1.20-1.80% of Mn, less than or equal to 0.012% of P, less than or equal to 0.005% of S, 0.1-0.6% of Ni, 0.10-0.30% of Mo, 0.10-0.40% of Cu, less than or equal to 0.06% of Ti, 0.01-0.05% of Ce, 0.01-0.05% of La, less than or equal to 0.03% of Zr, 0.01-0.03% of Sn, and the balance of Fe and unavoidable impurities; the content of C, si, mn, cu, ni, mo, sn, ti in the chemical components accords with the following conditions: cs is 1.0.ltoreq.1.3, where cs= (2si+ni+3mo+5cu+30sn-10C)/(8c+mn+2mo+ni). The component content of C, si, mn, ni, mo, cu, sn is regulated, so that the welding seam achieves the technical effects of high corrosion resistance and excellent low-temperature toughness, and the method is suitable for high-efficiency intelligent welding manufacture of large crude oil storage tanks.
Description
Technical Field
The invention belongs to the field of special welding materials, and in particular relates to a gas shielded welding wire which is applied to a crude oil storage tank steel welding procedure and can bear 10-30kJ/cm of heat input, wherein the welding seam is in an acidic high Cl state - Has high corrosion resistance in the environment.
Background
A gas shielded welding wire such as H08A matched with 12MnNiVR steel in the field of crude oil storage tanks at present is a conventional welding wire which has no corrosion resistance, and adopts the standard of International maritime organization IMO (inspection guidelines for corrosion resistance Steel materials for crude oil cargo tanks) of crude oil tankers, wherein the average annual corrosion rate is 2.1mm/a, the base metal and the welding seam have corrosion steps which are larger than 30um and far exceed the standard of the average annual corrosion rate of 1mm/a, and the corrosion steps do not exceed 30um under the accelerated corrosion simulation environment of 10% NaCl aqueous solution. The main components of H08A are: c: less than or equal to 0.10, mn:0.30-0.60, si: less than or equal to 0.03, cu: the addition amount of the corrosion-resistant element is less than or equal to 0.20, so that the corrosion performance of the welding line is poor, the requirement of the current stage on the service life of the storage tank cannot be met, and the risk of uncertainty is increased for safe production. In order to meet the corrosion performance of the welding line, scientific researchers often add a large amount of corrosion-resistant elements such as Si, mo, ni, cu and trace amounts of harmful elements into the welding line to improve the corrosion, however, the addition of alloy elements also reduces the welding process applicability of the welding line and the comprehensive performance such as mechanical properties of the welding line. Therefore, the alloy composition control of the welding wire and the balance between the mechanical property and the corrosion performance of the welding seam become the difficulty in researching and developing the corrosion-resistant welding material. In order to accelerate the construction of the domestic high-quality corrosion-resistant crude oil storage tank, development of welding wire steel and welding materials matched with the corrosion-resistant crude oil storage tank steel is urgently needed in China.
In order to solve the above problems, special welding material researchers have conducted some beneficial researches in the field of corrosion resistant special welding materials.
Chinese patent application CN201110085695.4 discloses a gas shielded welding wire for cargo oil tanks of oil tankers, which is added with 0.1-1% of Ni, 0.1-1% of Cu, 0-0.1% of Cr, 0.01-0.05 and Sn, sb, as, se, bi, pb of Mo or W, and the content is between 0.01-0.30, so as to ensure the corrosiveness of the welding seam under the acidic condition. The invention has no trace Cr element added, and is different from the Si-Ni-Cu-Mo-Sn alloy system adopted by the invention in content. And the content of harmful elements is too high, which tends to cause the problems of reduced low-temperature toughness of the welding seam, poor welding manufacturability and the like.
The invention relates to a high corrosion-resistant gas-shielded welding wire, wherein the invention optimizes the content of C, improves the content of Ni and Cu, adopts a Ni-Cu-Mo system to ensure corrosion resistance, and does not add Sn, which is an important corrosion-resistant element. Meanwhile, the increase of Ni content can improve the low-temperature toughness by improving the stacking fault, but the risk of Ni element segregation is increased. Too high addition of Cu element also increases the tendency of welding cracks, so that the toughness of the welding line is reduced, and the tensile strength of the welding line disclosed by the invention is about 570MPa, and has more strength difference with the welding line disclosed by the invention.
Chinese patent application CN201210553022.1 discloses a high corrosion resistant gas shielded welding wire, which adopts a low-carbon high-silicon corrosion resistant element Ni-Cu-Cr (W) alloy system to improve the corrosion resistance of a welding line, and does not add strong corrosion resistant element Sn. The invention adopts a trace element Si-Ni-Cu-Mo-Sn system, and the corrosion prevention mechanism is different.
Therefore, under the requirements of meeting the related standards, specifications and the like on the mechanical property and the corrosion property of the welding joint, in order to improve the corrosion safety of the large crude oil storage tank, the matched domestic gas shielded welding wire applicable to the corrosion-resistant crude oil storage tank needs to be developed, and the key of further improving the service life of the large crude oil storage tank, reducing the cost, improving the mechanical property of the welding joint and accelerating the upgrading of products is provided.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and the problems, and provides a high-corrosion-resistance gas shielded welding wire capable of bearing 10-30kJ/cm of heat input, which can achieve the technical effects of high corrosion resistance and excellent low-temperature toughness of a welding seam by regulating and controlling the content of C, si, mn, ni, mo, cu, sn components and is suitable for high-efficiency intelligent welding manufacture of a large-scale crude oil storage tank.
The technical scheme adopted by the invention is as follows: a high corrosion resistant gas shielded welding wire capable of bearing 10-30kJ/cm of heat input comprises the following chemical components in percentage by mass: 0.04-0.10% of C, 0.20-0.60% of Si, 1.20-1.80% of Mn, less than or equal to 0.012% of P, less than or equal to 0.005% of S, 0.1-0.6% of Ni, 0.10-0.30% of Mo, 0.10-0.40% of Cu, less than or equal to 0.06% of Ti, 0.01-0.05% of Ce, 0.01-0.05% of La, less than or equal to 0.03% of Zr, 0.01-0.03% of Sn, and the balance of Fe and unavoidable impurities;
the content of C, si, mn, cu, ni, mo, sn, ti in the chemical components accords with the following conditions: cs is more than or equal to 1.0 and less than or equal to 1.3,
wherein cs= (2si+ni+3mo+5cu+30sn-10C)/(8c+mn+2mo+ni).
When alkaline sintered flux is selected and welded under the heat input condition of 10-30kJ/cm, the yield strength of deposited metal of the welding wire is more than or equal to 540Mpa, the tensile strength is more than or equal to 620 Mpa, the elongation is more than or equal to 22%, and the KV is 20 ℃ below zero at the ambient temperature 2 The notch impact energy is not lower than 60J.
When alkaline sintered flux is selected and welded under the heat input condition of 10-30kJ/cm, deposited metal of the welding wire adopts PH=0.85 and 10% NaCl aqueous solution accelerated corrosion simulation environment in IMO (inspection guideline for corrosion resistance steel materials for cargo oil tanks of crude oil tankers), the annual corrosion rate is lower than 0.6 mm/year, and the corrosion step of the steel plate and the welding seam is lower than 20um.
The surface of the welding wire is provided with a copper plating layer, and the thickness of the copper plating layer is 0.15-0.23um.
The welding wire manufacturing method is the same as the prior art, and the specific manufacturing method comprises the following steps: preparing a steelmaking blank according to alloy components of a welding wire, filling the blank into a vacuum smelting furnace, vacuumizing, flushing argon for protection, heating at a high temperature until the blank is melted into molten steel, adding a quantitative Ce alloy block, adjusting the temperature in the furnace, and casting into a cylindrical steel ingot; cutting off a riser, polishing the surface of an ingot, heating to 1200 ℃ in a furnace, preserving heat for 2h, taking out the ingot, cogging and forging into square billets; polishing the forged square billet, heating to 1200 ℃ in a furnace, rolling and drawing to form a wire rod; the wire rod is processed into the gas shielded welding wire through acid washing, borax treatment, rough drawing, finish drawing, acid washing and copper plating. Wherein the thickness of the copper plating layer is 0.19-0.23um, and the copper plating layer is finally coiled and packaged into a finished product.
In the technical scheme, the functions and mechanisms of the components are as follows:
c: carbon is the most important element for improving the weld strength of low alloy steels. Carbon can be dissolved in weld metal to improve the stability of austenite, enlarge the austenite phase region, reduce the austenite-ferrite transformation temperature, refine grains, thereby improving the strength of the weld, but also reduce the corrosion resistance of the weld. The carbon content is limited to 0.04-0.10%.
Si: silicon is a strong deoxidizer and exists in the weld mainly in the form of solid solution and oxide inclusions. Silicon is a ferrite forming element, and as the silicon content increases, the ferrite content increases accordingly. The oxide of silicon shows stronger corrosiveness under the acidic condition, so that the corrosion resistance of the welding seam can be improved, but the toughness is damaged due to too high addition of silicon, and the gas shield welding flux also has Si transition, so that the content of silicon in the welding wire and the coil steel needs to be controlled. . The silicon content is limited to 0.20-0.60% in the invention.
Mn: manganese is an important deoxidizing and desulfurizing element, which can improve the strength of weld metal and reduce the hot cracking tendency of welding. Meanwhile, manganese is one of few elements which can improve the strength of the welding seam and the toughness of the welding seam, and Mn can mainly improve the stability of austenite, reduce the transformation temperature, refine grains and further influence the toughness of the welding seam. andwhenthemetalmanganesecontentoftheweldingseamistoohigh,theinfluenceonthelarge-sizebrittlestructureM-Aislarge,sothatthetoughnessisreduced. Therefore, the manganese content in the welding wire components is limited to 1.20-1.80%.
Mo: in the welding process, mo is relatively stable, the transition coefficient is relatively high, and proper amount of Mo element is added into the gas-shielded welding wire, so that the grain size can be effectively refined, and the strength and toughness are improved. Mo can make the welding line move forward from corrosion potential, and can be biased at austenitic grain boundary, and in the welding line which is usually in the form of molybdate, the uniform corrosiveness of the matrix is improved, the tendency of preferential corrosion of austenitic grain boundary is reduced, but the content of Mo is controlled, and the increase of the strength is avoided. The content of the welding wire components is limited to 0.10-0.30%.
Ni: the invention adds Ni element into gas-shielded welding wire, which has the main functions of improving the low-temperature toughness of weld metal and the uniform corrosiveness of matrix, and simultaneously, improves the strength of weld metal by utilizing the solid solution strengthening function. The mechanism of Ni to improve low temperature toughness is to reduce its brittle transition temperature by toughening the ferrite matrix and increasing the stacking fault energy. Meanwhile, ni is an austenite stabilizing element, and the austenite phase transition temperature is lowered by addition of an appropriate amount. Ni, however, in the present invention, a trace amount of tin element was added, and when both elements were present, ni content was too high, shi Yi was prone to hot cracking. Therefore, the Ni content in the wire composition is limited to 0.1-0.6%.
Cu: cu is an important element for improving the corrosion resistance of the weld joint, and the action mechanism of Cu can be divided into two parts. Firstly, when galvanic corrosion occurs, cu element can passivate anode reaction, and the corrosion rate is obviously slowed down. Secondly, the enrichment of Cu element effectively prevents the reaction of the matrix and the corrosive medium, and reduces the corrosion rate. However, excessive addition of Cu is liable to cause weld cracking, and should be properly added. Therefore, the Cu content in the welding wire component is controlled to be 0.10-0.40%.
Cr: cr element is an important element resistant to atmospheric corrosion. Cr element can form infinite solid solution with Fe, and when corrosion occurs, cr element redistributes and is enriched at microcrack and grain boundary of rust layer, so as to block the passage of external medium to matrix; the chromium element exceeding the solubility is repelled into the matrix, so that the alloy element is enriched in the matrix at the interface, the further growth of the crystal grains of the rust layer is blocked, and the rust layer grows compactly. However, a dense rust layer cannot be formed under acidic conditions, and corrosion of the substrate is accelerated. Therefore, cr element is not added into the welding wire.
Sn: sn is widely regarded as a harmful element in welding wire steel, and is mainly because Sn deviates from a columnar grain boundary, affects low-temperature toughness of a weld joint, and has obvious influence on low-temperature toughness. The Sn element can obviously improve the corrosion resistance of the matrix under the acidic condition, and the main mechanism is mainly that the Sn element is separated out from the surface of the matrix and oxidized into SnO under the acidic aqueous solution condition 2 Protecting the crystal face from corrosion<1,1,1>Preferential corrosion of the surface, grain boundary and inclusion occurs, and the corrosion performance in an acidic environment is improved. Researches show that trace (less than or equal to 0.10) can properly improve the corrosion resistance, and the excessive addition of the alloy has easy damage toughness. The Sn content of the invention is controlled to be 0.01-0.03%.
Ce. La: ce and La are added into the welding wire, and have three main effects: firstly, improving the component constitution of the inclusion, forming the inclusion which is relatively low in mismatch with acicular ferrite and is rich in Ce, la, S, O, al element, and forming acicular ferrite nuclear particles, so that the content of the acicular ferrite is increased; secondly, refining the size of the inclusion, combining the oxide rich in Ce with the larger inclusion in the oxide metallurgy process carried out in the molten pool reaction to form the large inclusion, floating the large inclusion, discharging the large inclusion out of the molten pool, further refining the size of the inclusion, reducing the possibility that the large-diameter inclusion becomes a crack source, and improving the toughness. In addition, researches show that the probability of forming acicular ferrite nucleation points in weld metal with inclusion size of 0.6-1.8 um can reach 80%, so as to refine weld structure and improve toughness. The content of Ce and La is controlled to be 0.01-0.05%.
Zr element can improve the strength of a welding line through precipitation strengthening and solid solution strengthening, zr can be thinned and dispersed with high-melting-point inclusions in a molten pool, the molten pool fluidity is improved, and Zr also has the function of nitrogen fixation, and the Zr content in the welding wire is controlled to be less than or equal to 0.03 percent
S and P: the alloy has the harmful effect on the toughness of welded seam metals, and the content of the alloy is too high, so that cracks are easily generated on the welded seam, and the content of the alloy, especially the P element, is reduced as much as possible. The content of S element is required to be not more than 0.005%, and the content of P element is required to be not more than 0.012%.
The corrosion types of the welded joint of the inner bottom plate of the corrosion-resistant crude oil storage tank in the actual service environment can be divided into four types, namely uniform corrosion, electrochemical corrosion, microbial corrosion and pitting corrosion of a substrate. Uniform corrosion, electrochemical corrosion, and pitting corrosion are critical in determining the corrosion rate of welded joints. The invention mainly considers two aspects of ensuring the uniform corrosion of the base by adopting a Cu-Mo-Ni element system and reducing the corrosion rate of a preferential corrosion area (such as crystal face <1, 1> and a crystal boundary) by adding trace Sn element so as to achieve the aim of improving the corrosion resistance of the welded joint, which are indispensable; the addition of a large amount of fine crystal elements Mn, ni and Mo increases the number of crystal grains, the crystal boundary ratio interface and the <1, 1> crystal face are increased, and the overall corrosion resistance balance is destroyed, so that the elements C, si, mn, ni, mo, cu, sn need to be regulated (the proportion satisfies the relation of Cs= (2Si+Ni+3Mo+5Cu+25Sn-10C)/(5C+Mn+2Mo+Ni), and Cs is more than or equal to 1.0 and less than or equal to 1.5) so as to ensure the overall corrosion resistance. Si and trace Sn exist in the weld joint in a solid solution mode, when hydrolysis reaction occurs in an acidic high-Cl-water solution, the hydrolysis reaction is oxidized by dissolved oxygen in water, and the Sn element is separated out on the surface of a substrate and oxidized into SnO2 to protect corrosion-prone crystal face <1, 1> face, crystal boundary and inclusion from preferential corrosion, so that the corrosion performance under an acidic environment is improved. The Ni and Mo elements are important corrosion elements, so that the self-corrosion potential of the welding line can be positively shifted, and the Mo elements can be partially concentrated at the crystal boundary to provide the corrosiveness of the crystal boundary. However, addition of Ni, mo and Mn elements also lowers the phase transition temperature, refines grains, increases the specific interface, and lowers the corrosion resistance. The enrichment theory of Cu element reduces the corrosion rate and can effectively improve the corrosion resistance of the matrix. The addition of the element C mainly ensures the strength of the welding seam, but researches show that the addition of the element C can greatly reduce the corrosion resistance.
The invention has the beneficial effects that: 1) The deposited metal obtained by the welding wire under the heat input of 10-30kJ/cm adopts a Si-Ni-Mo-Cu-Sn alloy system to improve the corrosiveness of a matrix and a grain boundary, adopts the standard PH=0.85 of IMO (crude oil tanker cargo oil tank corrosion resistant steel inspection guideline), has the annual corrosion rate lower than 0.6 mm/year under the environment of accelerated corrosion simulation of 10% NaCl aqueous solution, and has the corrosion step of a steel plate and a welding seam lower than 20um; the invention effectively prolongs the service life of the inner bottom plate of the storage tank in the severe corrosion environment of crude oil storage, improves the ampere production coefficient, reduces the maintenance cost of cleaning the inner bottom plate, and is beneficial to promoting the industrial upgrading of the crude oil storage tank construction field. 2) The welding wire disclosed by the invention is suitable for submerged arc automatic welding of a large-scale corrosion-resistant crude oil storage tank, the corrosion resistance is more than 1-2 times that of a conventional single-wire gas-shielded welding wire, the welding parameter range is adjusted widely, the welding process performance is stable under the heat input of 10-30kJ/cm, the flowability of a molten pool is good, the deposited metal is attractive in appearance, and the cracking resistance is excellent. 3) The deposited metal of the welding wire has the following corrosion and mechanical properties under the heat input of 10-30 kJ/cm: average annual weld corrosion rate: 0.42-0.58mm/a, and the corrosion steps of the base metal and the welding line: 0-20um, 20 ℃ below zero impact absorption power Akv-20 ℃/J:69.8-121.6J. 4) The welding wire alloy system is reasonable in regulation and control, the wire rod smelting and rolling and welding wire drawing processes are easy to realize, the quality is stable, and the welding wire alloy system is suitable for large-scale popularization and application.
Drawings
The present invention will be described in detail with reference to the accompanying drawings
FIG. 1 is a macroscopic corrosion chart of the hanging sheet of example 1;
FIG. 2 is a macroscopic corrosion chart of comparative example 1;
FIG. 3 is a microstructure of the deposited metal of example 1;
fig. 4 shows the microstructure of the deposited metal of comparative example 1.
Detailed Description
Advantages and salient features of the invention will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings and examples, discloses the invention.
The invention provides a high corrosion resistant gas shielded welding wire capable of bearing 10-30kJ/cm of heat input, which comprises the following chemical components in percentage by mass: 0.04-0.10% of C, 0.20-0.60% of Si, 1.20-1.80% of Mn, less than or equal to 0.012% of P, less than or equal to 0.005% of S, 0.1-0.6% of Ni, 0.10-0.30% of Mo, 0.10-0.40% of Cu, less than or equal to 0.06% of Ti, 0.01-0.05% of Ce, 0.01-0.05% of La, less than or equal to 0.03% of Zr, 0.01-0.03% of Sn, and the balance of Fe and unavoidable impurities;
the content of C, si, mn, cu, ni, mo, sn, ti in the chemical components accords with the following conditions: cs is more than or equal to 1.0 and less than or equal to 1.3,
wherein cs= (2si+ni+3mo+5cu+30sn-10C)/(8c+mn+2mo+ni).
When alkaline sintered flux is selected and welded under the heat input condition of 10-30kJ/cm, the yield strength of deposited metal of the welding wire is more than or equal to 540Mpa, the tensile strength is more than or equal to 620 Mpa, the elongation is more than or equal to 22%, and the KV is 20 ℃ below zero at the ambient temperature 2 The notch impact energy is not lower than 60J.
When alkaline sintered flux is selected and welded under the heat input condition of 10-30kJ/cm, deposited metal of the welding wire adopts PH=0.85 and 10% NaCl aqueous solution accelerated corrosion simulation environment in IMO (inspection guideline for corrosion resistance steel materials for cargo oil tanks of crude oil tankers), the annual corrosion rate is lower than 0.6 mm/year, and the corrosion step of the steel plate and the welding seam is lower than 20um.
The surface of the welding wire is provided with a copper plating layer, and the thickness of the copper plating layer is 0.15-0.23um.
The invention will be described in detail with reference to specific examples.
TABLE 1 chemical compositions of examples 1-10 and comparative examples 1-3
Table 1 shows the chemical compositions (balance Fe) of examples 1 to 10 and comparative examples 1 to 3 of the present invention; examples 1-10 and comparative examples 1-3 were each produced as follows:
preparing a steelmaking blank according to alloy components of a welding wire, filling the blank into a vacuum smelting furnace, vacuumizing, flushing argon for protection, heating at a high temperature until the blank is melted into molten steel, adding a quantitative Ce alloy block, adjusting the temperature in the furnace, and casting into a cylindrical steel ingot; cutting off a riser, polishing the surface of an ingot, heating to 1200 ℃ in a furnace, preserving heat for 2h, taking out the ingot, cogging and forging into square billets; polishing the forged square billet, heating to 1200 ℃ in a furnace, rolling and drawing to form a wire rod; the wire rod is processed into the gas shielded welding wire through acid washing, borax treatment, rough drawing, finish drawing, acid washing and copper plating. Wherein the thickness of the copper plating layer is 0.19-0.23um, and the copper plating layer is finally coiled and packaged into a finished product.
Examples 1-10 and comparative examples 1-3 deposited metal monofilament deposited metal tests were conducted according to the welding process parameters of table 2, with a welding heat input of 10-30kJ/cm, with alkaline sintered flux selected for welding, and with a layer temperature control of no more than 160 ℃.
TABLE 2 groove form for deposit metal test
The test pieces of examples 1 to 10 and comparative examples 1 to 3 were subjected to visual inspection after welding, the deposited metal was subjected to nondestructive inspection by using an ultrasonic flaw detection technique, the inspection was passed, impact test pieces and corrosion hanging pieces were taken from the welded deposited metal, and the test piece sizes and test methods were carried out in accordance with the specifications of GB/T228 and MSC 289. The impact sample is cut from the center of the deposited metal, the longitudinal axis of the impact sample is vertical to the length direction of the deposited metal, the notch surface is vertical to the surface of the deposited metal, and the notch axis is positioned in the center of the deposited metal. The sample size was 10X 55mm, and the impact test method was performed according to GB/T229. After sampling, polishing the surface of the hanging piece by using 600-mesh sand paper, carrying out full immersion on the deposited metal corrosion hanging piece for 72 hours under a simulation environment (PH=0.85, 10% NaCl aqueous solution), and calculating the average annual corrosion rate according to a formula; and (5) after the corrosion hanging piece of the welded joint is fully immersed for 168 hours, observing the corrosion step under a 100 times metallographic microscope.
Wherein: w: weight loss (g), S: surface area (cm 2), D: density (g/cm 3);
the results of the corrosion test on the deposited metal are shown in Table 3, and the average values are shown in brackets.
TABLE 3 deposited metal Corrosion and mechanical Properties of the welding wires of examples 1-10 and comparative examples 1-3
The chemical compositions of examples 1-10 meet the inventive requirements, and when Cs meets 1.2.ltoreq.Cs.ltoreq.2.0, the average annual corrosion rate of the weld is: 0.42-0.55mm/a, and the corrosion steps of the base metal and the welding line: 0-20um, meets the corrosion requirement of the invention (specifically referring to a macroscopic corrosion diagram of a hanging piece in an embodiment 1 shown in fig. 1), and the impact absorption power Akv of deposited metal at minus 20 ℃ is not lower than 60J. While the chemical compositions of comparative examples 1-3 do not meet the requirements of the invention, the deposited metal neither meets the corrosion standard (refer specifically to the comparative example 1 coupon macroscopic corrosion chart shown in fig. 2), nor ensures the low temperature impact toughness of the deposited metal.
Taking a metallographic sample from an impact sample of the deposited metal, it was found that the deposited metal structures of examples 1 to 10 were mainly composed of acicular ferrite, a small amount of grain boundary ferrite and granular bainite (refer specifically to the microstructure of example 1 shown in fig. 3), whereas the deposited metal structures of comparative examples 1 to 3 were mainly composed of massive ferrite, a small amount of acicular ferrite and granular bainite (refer specifically to the microstructure of comparative example 1 shown in fig. 4). The acicular ferrite has fine grains and large-angle grain boundaries, can prevent crack growth and improve impact toughness. The invention has better tissue regulation.
As can be seen from the inspection results of the embodiments 1-10, the gas shielded welding wire provided by the invention has good corrosion resistance when the mechanical properties of deposited metal reach the standard requirements under the heat input of 10-30kJ/cm, and also has excellent low-temperature impact toughness, and the impact absorption work Akv of the weld metal at the temperature of minus 20 ℃ is 69.8-121.6J, so that the gas shielded welding wire is suitable for the production and welding manufacturing of large-scale welding structural members in industries such as petroleum, ships and the like.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (4)
1. The high corrosion resistant gas shielded welding wire capable of bearing 10-30kJ/cm heat input is characterized by comprising the following chemical components in percentage by mass: 0.04-0.10% of C, 0.20-0.60% of Si, 1.20-1.80% of Mn, less than or equal to 0.012% of P, less than or equal to 0.005% of S, 0.1-0.6% of Ni, 0.10-0.30% of Mo, 0.10-0.40% of Cu, less than or equal to 0.06% of Ti, 0.01-0.05% of Ce, 0.01-0.05% of La, less than or equal to 0.03% of Zr, 0.01-0.03% of Sn, and the balance of Fe and unavoidable impurities;
the content of C, si, mn, cu, ni, mo, sn, ti in the chemical components accords with the following conditions: cs is more than or equal to 1.0 and less than or equal to 1.3,
wherein cs= (2si+ni+3mo+5cu+30sn-10C)/(8c+mn+2mo+ni).
2. The high corrosion resistant gas shielded welding wire of claim 1, wherein the high corrosion resistant gas shielded welding wire is capable of withstanding a heat input of 10 to 30kJ/cm, wherein: when alkaline sintered flux is selected and welded under the heat input condition of 10-30kJ/cm, the yield strength of deposited metal of the welding wire is more than or equal to 540Mpa, the tensile strength is more than or equal to 620 Mpa, the elongation is more than or equal to 22%, and the KV is 20 ℃ below zero at the ambient temperature 2 The notch impact energy is not lower than 60J.
3. The high corrosion resistant gas shielded welding wire of claim 1, wherein the high corrosion resistant gas shielded welding wire is capable of withstanding a heat input of 10 to 30kJ/cm, wherein: when alkaline sintered flux is selected and welded under the heat input condition of 10-30kJ/cm, deposited metal of the welding wire adopts PH=0.85 in IMO (crude oil tanker cargo oil tank corrosion resistant steel inspection guide) standard, the annual corrosion rate is lower than 0.6 mm/year under the environment of 10% NaCl aqueous solution accelerated corrosion simulation, and the corrosion step of the steel plate and the welding seam is lower than 20 mu m.
4. The high corrosion resistant gas shielded welding wire of claim 1, wherein the high corrosion resistant gas shielded welding wire is capable of withstanding a heat input of 10 to 30kJ/cm, wherein: the surface of the welding wire is provided with a copper plating layer, and the thickness of the copper plating layer is 0.15-0.23um.
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