CN111843291A - High-strength corrosion-resistant low-nickel welding rod - Google Patents
High-strength corrosion-resistant low-nickel welding rod Download PDFInfo
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- CN111843291A CN111843291A CN202010822509.XA CN202010822509A CN111843291A CN 111843291 A CN111843291 A CN 111843291A CN 202010822509 A CN202010822509 A CN 202010822509A CN 111843291 A CN111843291 A CN 111843291A
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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
- B23K35/3073—Fe as the principal constituent with Mn as next major constituent
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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
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/365—Selection of non-metallic compositions of coating materials either alone or conjoint with selection of soldering or welding materials
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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
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/368—Selection of non-metallic compositions of core materials either alone or conjoint with selection of soldering or welding materials
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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
- B23K9/00—Arc welding or cutting
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- Nonmetallic Welding Materials (AREA)
Abstract
The invention provides a high-strength corrosion-resistant low-nickel welding rod, wherein the alloy components of deposited metal comprise, by mass, 0.03-0.06% of C, 0.1-0.3% of Si, 1.0-1.7% of Mn, 0.2-0.55% of Mo, 0.4-1.0% of Ni, 0.2-0.4% of Cr, 0.2-0.35% of Cu, less than or equal to 0.008% of S, less than or equal to 0.012% of P, and the balance Fe and inevitable impurities, and the sum of the mass percentages of the components is 100%. The welding rod of the invention belongs to a Cr-Ni-Cu low alloy system, has high purity, low carbon equivalent, small sensitivity coefficient of cold crack generated on a welded joint after welding, relatively low production cost, high strength and high toughness.
Description
Technical Field
The invention belongs to the technical field of welding materials, and particularly relates to a high-strength corrosion-resistant low-nickel welding rod.
Background
With the development of national economy and modern industry, the demand of China for developing ocean resources is increasingly enhanced. However, compared with countries in Europe, America, Japan and Korean, the development of marine engineering in China is late, D, E and F-grade steel plates with yield strength of 355-460MPa are mainly used, the strength of the steel is not high, the specification is incomplete, the corrosion resistance is poor, the matching process is incomplete, and the capability of independently developing marine resources in China is limited. With the development of marine resources to deep sea and polar regions, the marine engineering equipment has a remarkable trend of deep hydration and large scale, the service environment is worse, the structural form is more complex, and the development of marine steel towards high strength, high toughness, easy weldability, good corrosion resistance, large thickness and large specification is promoted. China is used as a main global maritime work equipment manufacturing large country, the maritime work equipment manufacturing industry is large and weak, products are low-end, varieties and specifications of matched materials are not complete, particularly the localization degree of large-thickness corrosion-resistant ultrahigh-strength maritime work steel matched welding materials is low, and nearly 70% of high-end maritime work welding materials still need to be imported. Therefore, the development of a marine steel welding material which is suitable for large thickness, high strength, high toughness, high purity, ultralow hydrogen and corrosion resistance is urgently needed.
In recent years, domestic steel enterprises have achieved great achievement in the aspect of Q690-grade high-strength marine steel development, and modulation rack steel with the maximum thickness of 178mm is trial-manufactured. However, the development and development of domestic matched welding materials is far behind that of steel products, the development of domestic marine engineering equipment is limited, and particularly, the high-strength high-toughness high-corrosion-resistance domestic welding materials for welding large thick plates become the most independent short plates in the domestic chemical equipment manufacturing industry. At present, high-strength welding materials used by domestic maritime work equipment are provided by foreign well-known welding material enterprises, such as Olympic, Berle, Lincoln, Isa, Shen Steel, Xinri iron and the like, and 690 MPa-level maritime work series welding materials released by the high-strength welding materials are widely applied at home and abroad. The imported welding material has good welding operation process performance, attractive weld formation and easy operation for welders, and particularly has outstanding low-temperature impact toughness resistance and weld repair rate, but the price is high and the delivery cycle is long. The domestic high-strength and high-toughness welding materials of welding material enterprises and scientific research institutes have certain research results, such as domestic THJ807RH, GEL-118 welding rods and GFR-110K3 gas shielded flux-cored wires for welding Q690E-grade steel plates (the maximum thickness can reach 100mm), but the domestic high-strength marine welding materials have certain difference with imported welding materials in the welding process.
Because of the increasingly severe service environment, welding materials in marine equipment must have good corrosion resistance, and in addition, the welding seam metal has low cold crack sensitivity, thereby ensuring to meet the requirement of high strength, improving the toughness of the welding seam metal and a heat affected zone and having lower dilution rate. In addition, in order to reduce the dead weight and bear high pressure, low-alloy high-strength steel is generally adopted, so the design of welding materials also meets the requirements of low alloy high strength and high toughness. In addition, the welding member needs to be in service at low temperature, the content of diffused hydrogen of a welding bead is required to be lower so as to prevent hydrogen-induced cracks, and the welding material is required to have better low-temperature impact resistance.
Disclosure of Invention
In view of the above, the present invention is directed to a high-strength corrosion-resistant low-nickel welding rod, which is a basic low-hydrogen welding rod with high strength, high toughness, low nickel content, low hydrogen content and high purity, so as to overcome the disadvantages of the prior art.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the high-strength corrosion-resistant low-nickel welding rod is characterized by that its deposited metal alloy composition includes (by mass%) C0.03-0.06%, Si 0.1-0.3%, Mn 1.0-1.7%, Mo 0.2-0.55%, Ni 0.4-1.0%, Cr 0.2-0.4%, Cu 0.2-0.35%, S less than or equal to 0.006%, P less than or equal to 0.012%, and the rest is Fe and inevitable impurity, and the sum of the mass percentages of all the components is 100%. Wherein the content of inevitable impurities is less than or equal to 0.035%;
preferably, the carbon equivalent: CE ═ C ] + [ Mn ]/6+ ([ Cr ] + [ Mo ] + [ V ])/5+ ([ Ni ] + [ Cu ])/15 (%), carbon equivalent in the deposited metal ranged from 0.32 to 0.62%; cold crack susceptibility Pcm ═ C + ([ Mn ] + [ Cr ] + [ Cu ])/20+ [ Si ]/30+ [ Mo ]/15+ [ Ni ]/60+ [ V ]/10+5[ B ] (%), with Pcm values ranging from 0.12 to 0.25%; wherein [ C ], [ Mn ], [ Cr ], [ Mo ], [ Ni ], [ Cu ], [ Si ] respectively represent the mass percentage of C, Mn, Cr, Mo, Ni, Cu and Si in the cladding metal.
The carbon equivalent of the Q690E steel is generally 0.5-0.7%, while the welding rod of the invention has the value of the carbon equivalent of 0.35-0.60%, which is less than the carbon equivalent content of the base metal, so the steel plate can be preheated low before welding, the preheating temperature can be controlled at 80 ℃ generally, when the carbon equivalent is not higher than 0.4%, and the plate thickness can not be preheated when the plate thickness is not more than 30 mm; the time and cost of production are reduced.
Preferably, it consists of a sheath and a core wire, wherein,
the coating comprises the following components in parts by weight, namely 20-45 parts of marble powder; 15-25 parts of fluorite powder, 3-7 parts of first-grade rutile powder, 3-6 parts of ferrosilicon powder, 4-7 parts of ferromanganese powder, 3-5 parts of silica micropowder, 3-5 parts of calcium carbonate, 10-15 parts of alloying agent, 0.5-1 part of soda ash and 0.5-1 part of sodium alginate.
Preferably, the core wire comprises, by mass, not more than 0.03% of C, not more than 0.03% of Si, not more than 0.007% of S, not more than 0.007% of P, not more than 0.05% of Ni, not more than 0.05% of Mo, not more than 0.05% of Cr, not more than 0.05% of Cu, 0.4-0.6% of Mn, and the balance of Fe and unavoidable impurities.
Preferably, the alloying agent is a mixture of metal chromium powder, nickel powder, copper powder, molybdenum powder, titanium-iron-carbon alloy powder and rare earth ferrosilicon powder, wherein the mass ratio of the chromium powder, the nickel powder, the copper powder, the molybdenum powder, the titanium-iron-carbon alloy powder (Ti: Fe: C ═ 6.5: 3.28: 0.22) to the rare earth ferrosilicon powder is (0.6-1.1): (1-2.5): (0.4-0.7): (0.5-1.3): (5.9-6.9): (0.4-2).
Preferably, in the titanium-iron-carbon alloy powder, Ti: fe: the mass ratio of C is 6.5: 3.28: 0.22.
the invention also provides the application of the high-strength corrosion-resistant low-nickel welding rod in the marine steel welding. Besides being suitable for ocean engineering, the method can also be used in the fields of petrochemical industry, bridge construction and the like.
Preferably, before welding, the welding rod is placed into a welding rod drying furnace to be baked for 1-2 hours at 380-400 ℃ and placed into a heat preservation box for standby, so that the welding rod is prevented from being affected with damp; the polarity of the power supply is in reverse direct current connection, and the current is controlled at 140-170A, preferably 160A; short arc welding is adopted, the welding bead temperature is controlled at 120-150 ℃, and the welding heat input is 10-25 KJ/mm.
The welding rod of the invention is a low alloy system, after calculation, compared with the existing high-strength high-toughness welding rod, the welding rod has low carbon equivalent and small cold crack sensitivity index, so that the welding heat input range can be 10-25KJ/mm during welding, and the preheating temperature before welding is low (80 ℃), and some welding rods do not need preheating treatment.
Before welding, preparing a groove according to the process requirements, polishing the groove, and removing an oxide layer, oil stains and water stains on the surface of the groove.
After welding, dehydrogenation treatment is carried out, asbestos is covered on the steel plate, the temperature of the welding joint is kept at the temperature of 200-250 ℃ for 1-2 hours, and the welding joint is slowly cooled to the room temperature.
The invention also provides the application of the high-strength corrosion-resistant low-nickel welding rod in the welding of Q690E-grade high-strength marine steel.
The deposited metal welded by the welding rod is a Cr-Ni-Cu corrosion-resistant alloy system, and is matched with the combined action of Mo and Ti elements, so that the weld metal can have good low-temperature impact toughness and corrosion resistance while ensuring high strength, and the weld metal has high strength (Rm is more than or equal to 770 MPa). The diffusible hydrogen content was controlled to be 4ml/100g or less (mercury method). In the weld metal: less than or equal to 0.06 percent of C, less than or equal to 0.006 percent of S, less than or equal to 0.012 percent of P and high purity.
Cr is a main enrichment element in the weather-resistant deposited metal rust layer, and the enrichment of Cr is favorable for refining rust layer grains, improving the corrosion potential of the rust layer, hindering the anodic dissolution reaction of weather-resistant steel and improving the atmospheric corrosion resistance.
Cu improves the strength of the welding seam in a solid solution strengthening mode, reduces the initial transformation temperature of the acicular ferrite, and improves the content of the acicular ferrite, thereby improving the strength and the toughness of the welding seam. A small amount of copper can be enriched in austenite, so that the low-temperature stability of the alloy can be improved, and the low-temperature impact at minus 40 ℃ can reach more than 70J. Moreover, the addition of copper can reduce the rate of electron flow to the cathode region by retarding the anodic dissolution of Fe or reducing the conductivity of the rust layer, thereby improving the weld metal corrosion resistance.
The Ni can improve the toughness of the weld metal, particularly improve the low-temperature impact toughness of the weld metal, reduce the brittle transition temperature, and simultaneously has an important strengthening effect in the weld; ni is an austenite forming element, and can form a compact oxide film between the rust layer and the matrix to prevent oxygen and water in the atmosphere from permeating into the metal matrix, thereby improving the atmospheric corrosion resistance of the welding line. However, Ni is a relatively expensive alloy element, the proportion of the whole alloy element in the weld metal is fully considered, and the Ni in the deposited metal is less than 1 percent, so that the excellent comprehensive performance can be effectively realized, and the cost is greatly reduced.
The titanium and the rare earth elements can refine grains, improve the appearance and the size of inclusions and improve the low-temperature toughness of weld metal.
The welding rod of the invention belongs to a Cr-Ni-Cu low alloy system, has high purity, low carbon equivalent, low preheating temperature before welding, no need of preheating treatment in some cases, small sensitivity coefficient of cold cracks generated on a welded joint after welding and relatively low production cost.
The welding rod of the invention contains Cr, Ni and Cu alloy elements, and the formula I is 26.01 (% Cu) +3.88 (% Ni) +1.20 (% Cr) +1.49 (% Si) +17.28 (% P) -7.29 (% Cu) x (% Ni) -9.10 (% Ni) x (% P) -33.39 (% Cu) calculated according to the weather resistance index2The weather resistance index I of the welding rod is in the range of 5.4-8.3, and a welding seam is not easy to corrode after welding. Wherein (% Cu), (% Ni), (% Cr), (% Si), and (% P) refer to the mass percentage of each element in the cladding metal.
The welding rod of the invention is strengthened by microalloy under the condition of low nickel, and the structure of deposited metal is a mixture of acicular ferrite and lower bainite, so that the welding rod has high strength and high toughness.
Compared with the prior art, the low-nickel welding rod with high strength, high toughness and corrosion resistance has the following advantages:
the high-strength high-toughness corrosion-resistant low-nickel welding rod adopts a Cr-Ni-Cu low-alloy system, the Ni content in deposited metal is less than 1%, excellent low-temperature impact toughness at minus 40 ℃ can be obtained, the low-temperature impact toughness of welded seam metal after welding is ensured, the comprehensive welding production cost is improved, and the price of the product is greatly reduced. The structure obtained after welding by the welding rod is a mixture of acicular ferrite and bainite, so that the welded deposited metal has high strength and high toughness, the tensile strength is more than or equal to 770MPa, and the low-temperature impact at minus 40 ℃ can reach more than 69J. The content of diffused hydrogen is controlled below 4ml/100g (mercury method), moreover, because of the low alloy system adopted by the welding rod, the carbon equivalent and the cold crack sensitivity index are low, the heat input is not required to be strictly controlled during welding, the welding rod can be preheated at low temperature before welding, and in some cases, even the preheating before welding is not required, so that the production process is shortened, and the production cost is reduced.
Detailed Description
Unless defined otherwise, technical terms used in the following examples have the same meanings as commonly understood by one of ordinary skill in the art to which the present invention belongs. The test reagents used in the following examples, unless otherwise specified, are all conventional biochemical reagents; the experimental methods are conventional methods unless otherwise specified.
The present invention will be described in detail with reference to examples.
Example 1
A high-strength corrosion-resistant low-nickel welding rod is prepared from the following components in percentage by weight:
the components of the coating are as follows:
marble powder: 45% and fluorite powder: 23% and first-grade rutile powder: 5% and ferrosilicon powder: 4.4% and manganese iron powder: 4.6% and silicon micropowder: 4%, calcium carbonate: 3% of alloying agent: 10% of soda ash: 0.5%, sodium alginate: 0.5 percent, and the sum of the weight percent of the components is 100 percent.
The alloy agent is a mixture of metal chromium powder, nickel powder, copper powder, molybdenum powder, titanium-iron-carbon alloy powder and rare earth ferrosilicon powder, wherein the chromium powder is 0.6 percent (in weight percentage of the coating component), the nickel powder is 1.80 percent (in weight percentage of the coating component), the copper powder is 0.4 percent (in weight percentage of the coating component), the molybdenum powder is 0.6 percent (in weight percentage of the coating component), the rare earth ferrosilicon powder is 0.4 percent (in weight percentage of the coating component), and the titanium-iron-carbon alloy powder (the mass ratio of Ti to Fe to C is 6.5: 3.28: 0.22) is 6.2 percent (in weight percentage of the coating component).
Refining the components of the core wire:
less than or equal to 0.03 percent of C, less than or equal to 0.03 percent of Si, less than or equal to 0.007 percent of S, less than or equal to 0.007 percent of P, less than or equal to 0.05 percent of Ni, less than or equal to 0.05 percent of Mo, less than or equal to 0.05 percent of Cr, less than or equal to 0.05 percent of Cu, 0.4-0.6 percent of Mn0.4, and the balance of iron and.
The deposited metal formed by the welding rod comprises the following chemical components in percentage by mass: 0.03% of C, 0.19% of Si, 1.30% of Mn1, 0.23% of Mo, 0.7% of Ni, 0.25% of Cr, 0.22% of Cu, 0.006% of S, 0.008% of P, and the balance of Fe and inevitable impurities.
The deposited metal of the electrode has a carbon equivalent Ceq and a cold crack sensitivity Pcm of 0.40% and 0.15%, respectively.
A high-strength corrosion-resistant low-nickel welding rod and a welding method thereof are carried out according to the following steps:
(1) before welding, the welding rod is put into a welding rod drying furnace to be baked for 1 hour at 380 ℃ and put into a heat preservation box for standby, so that the welding rod is prevented from being damped.
(2) Preparing a groove according to the process requirements, polishing the groove, and removing an oxide layer, oil stains and water stains on the surface of the groove.
(3) The polarity of the power supply adopts direct current reverse connection, the current is controlled at 140A, 20mm steel plates are adopted for non-preheating welding, short arc welding is adopted due to the adoption of alkaline welding rods, the welding bead temperature is controlled at 150 ℃, and the welding heat input is controlled at 12 KJ/mm.
The welding rod in the embodiment is subjected to deposited metal performance test, the yield strength is 695MPa, the tensile strength is 778MPa, the elongation after fracture is 22%, and the impact absorption work at minus 40 ℃ is 95J; the weathering index was 6.43.
Example 2
A high-strength corrosion-resistant low-nickel welding rod is prepared from the following components in percentage by weight:
the components of the coating are as follows:
marble powder: 41% and fluorite powder: 23% and first-grade rutile powder: 4.6% and ferrosilicon powder: 5% and manganese iron powder: 5% and silicon powder: 4%, calcium carbonate: 4%, alloying agent: 12% of soda ash: 0.7%, sodium alginate: 0.7 percent, and the sum of the weight percent of the components is 100 percent.
The alloy agent is a mixture of metal chromium powder, nickel powder, copper powder, molybdenum powder, titanium-iron-carbon alloy powder and rare earth ferrosilicon powder, wherein the chromium powder is 0.8 percent (in weight percent of the coating component), the nickel powder is 2.2 percent (in weight percent of the coating component), the copper powder is 0.6 percent (in weight percent of the coating component), the molybdenum powder is 1.0 percent (in weight percent of the coating component), the rare earth ferrosilicon powder is 1.5 percent (in weight percent of the coating component), and the titanium-iron-carbon powder (Ti: Fe: C mass ratio is 6.5: 3.28: 0.22) is 5.9 percent (in weight percent of the coating component).
Refining the components of the core wire:
less than or equal to 0.03 percent of C, less than or equal to 0.03 percent of Si, less than or equal to 0.007 percent of S, less than or equal to 0.007 percent of P, less than or equal to 0.05 percent of Ni, less than or equal to 0.05 percent of Mo, less than or equal to 0.05 percent of Cr, less than or equal to 0.05 percent of Cu, 0.4-0.6 percent of Mn0.4, and the balance of iron and.
The deposited metal formed by the welding rod comprises the following chemical components: 0.04% of C, 0.2% of Si, 1.35% of Mn1, 0.4% of Mo0.9% of Ni0.9%, 0.36% of Cr0.31% of Cu0.003% of S, 0.008% of P and the balance of Fe and inevitable impurities.
The deposited metal of the electrode has a carbon equivalent Ceq and a cold crack sensitivity Pcm of 0.50% and 0.19%, respectively.
A welding method of a high-strength corrosion-resistant low-nickel welding rod comprises the following steps:
(1) before welding, the welding rod is put into a welding rod drying furnace to be baked for 1 hour at 380 ℃ and put into a heat preservation box for standby, so that the welding rod is prevented from being damped.
(2) Preparing a groove according to the process requirements, polishing the groove, and removing an oxide layer, oil stains and water stains on the surface of the groove.
(3) The polarity of the power supply adopts direct current reverse connection, the welding current is 160A, the steel plate is preheated at the temperature of 80 ℃ before welding, short-arc welding is adopted due to the adoption of an alkaline welding rod, the welding bead temperature is controlled at 135 ℃, and the welding heat input is controlled at 20 KJ/mm.
The welding rod in the embodiment is subjected to deposited metal performance test, the yield strength is 715MPa, the tensile strength is 803MPa, the elongation after fracture is 21%, and the impact absorption work at minus 40 ℃ is 79J; the weather resistance index was 7.12.
Example 3
A high-strength corrosion-resistant low-nickel welding rod is prepared from the following components in percentage by weight:
the components of the coating are as follows:
marble powder: 36%, fluorite powder: 25% and first-grade rutile powder: 4% and ferrosilicon powder: 5% and manganese iron powder: 7% and silicon powder: 3%, calcium carbonate: 4%, alloying agent: 14% of soda ash: 1.0%, sodium alginate: 1.0 percent, and the sum of the weight percent of the components is 100 percent.
The alloy agent is a mixture of metal chromium powder, nickel powder, copper powder, molybdenum powder, ferrotitanium powder, iron-carbon alloy powder and rare earth ferrosilicon powder, wherein the chromium powder content is 1.1 percent (in weight percent of the coating component), the nickel powder content is 2.5 percent (in weight percent of the coating component), the copper powder content is 0.7 percent (in weight percent of the coating component), the molybdenum powder content is 1.3 percent (in weight percent of the coating component), the rare earth ferrosilicon powder content is 1.5 percent (in weight percent of the coating component), and the titanium-iron-carbon alloy powder (the mass ratio of Ti to Fe to C is 6.5: 3.28: 0.22) content is 6.9 percent (in weight percent of the coating component).
Refining the components of the core wire:
less than or equal to 0.03 percent of C, less than or equal to 0.03 percent of Si, less than or equal to 0.007 percent of S, less than or equal to 0.007 percent of P, less than or equal to 0.05 percent of Ni, less than or equal to 0.05 percent of Mo, less than or equal to 0.05 percent of Cr, less than or equal to 0.05 percent of Cu, 0.4-0.6 percent of Mn0.4, and the balance of iron and.
The deposited metal formed by the welding rod comprises the following chemical components: 0.06% of C, 0.3% of Si, 1.7% of Mn1, 0.55% of Mo0, 1.0% of Ni0, 0.4% of Cr0, 0.35% of Cu0, 0.006% of S, 0.012% of P, and the balance of Fe and inevitable impurities.
The deposited metal of the electrode has a carbon equivalent Ceq and a cold crack susceptibility Pcm of 0.62% and 0.25%, respectively.
A welding method of a high-strength corrosion-resistant low-nickel welding rod comprises the following steps:
(1) before welding, the welding rod is put into a welding rod drying furnace to be baked for 1 hour at 400 ℃, and then is put into a heat preservation box for standby, so that the welding rod is prevented from being damped.
(2) Preparing a groove according to the process requirements, polishing the groove, and removing an oxide layer, oil stains and water stains on the surface of the groove.
(3) The polarity of the power supply adopts direct current reverse connection, the welding current is 170A, the steel plate is preheated at the temperature of 80 ℃ before welding, short arc welding is adopted due to the adoption of an alkaline welding rod, the welding bead temperature is controlled at 130 ℃, and the welding heat input is controlled at 25 KJ/mm.
The welding rod in the example is subjected to a deposited metal performance test, the yield strength is 734MPa, the tensile strength is 838MPa, the elongation after fracture is more than 20 percent, the impact absorption energy at minus 40 ℃ is 69J, and the weather resistance index is 7.28.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A high-strength corrosion-resistant low-nickel welding rod is characterized in that: the deposited metal alloy comprises, by mass, 0.03-0.06% of C, 0.1-0.3% of Si, 1.0-1.7% of Mn, 0.2-0.55% of Mo, 0.4-1.0% of Ni, 0.2-0.4% of Cr, 0.2-0.35% of Cu, less than or equal to 0.006% of S, less than or equal to 0.012% of P, and the balance of Fe and inevitable impurities, wherein the sum of the mass percentages of the components is 100%.
2. The high strength, corrosion resistant, low nickel welding electrode of claim 1, wherein:
the carbon equivalent CE ═ C ] + [ Mn ]/6+ ([ Cr ] + [ Mo ] + [ V ])/5+ ([ Ni ] + [ Cu ])/15 (%), the range of carbon equivalent in the deposited metal is 0.32-0.62%;
the cold crack sensitivity index of the steel sheet,
Pcm＝[C]+([Mn]+[Cr]+[Cu])/20+[Si]/30+[Mo]/15+[Ni]/60+[V]/10+5[B]
(%), the value range of Pcm is 0.12-0.25%; wherein [ C ], [ Mn ], [ Cr ], [ Mo ], [ Ni ], [ Cu ], [ Si ] respectively represent the mass percentage of C, Mn, Cr, Mo, Ni, Cu and Si in the cladding metal.
3. The high strength, corrosion resistant, low nickel welding electrode of claim 1, wherein: which consists of a coating and a core wire, wherein,
the coating comprises the following components in parts by weight, namely 20-45 parts of marble powder; 15-25 parts of fluorite powder, 3-7 parts of first-grade rutile powder, 3-6 parts of ferrosilicon powder, 4-7 parts of ferromanganese powder, 3-5 parts of silica micropowder, 3-5 parts of calcium carbonate, 10-15 parts of alloying agent, 0.5-1 part of soda ash and 0.5-1 part of sodium alginate.
4. The high strength, corrosion resistant, low nickel welding electrode of claim 3, wherein: the core wire comprises, by mass, not more than 0.03% of C, not more than 0.03% of Si, not more than 0.007% of S, not more than 0.007% of P, not more than 0.05% of Ni, not more than 0.05% of Mo, not more than 0.05% of Cr, not more than 0.05% of Cu, 0.4-0.6% of Mn0.4, and the balance of Fe and inevitable impurities.
5. The high strength, corrosion resistant, low nickel welding electrode of claim 3, wherein: the alloy agent is a mixture of metal chromium powder, nickel powder, copper powder, molybdenum powder, titanium-iron-carbon alloy powder and rare earth ferrosilicon powder, wherein the mass ratio of the chromium powder to the nickel powder to the copper powder to the molybdenum powder to the titanium-iron-carbon alloy powder to the rare earth ferrosilicon powder is (0.6-1.1): (1-2.5): (0.4-0.7): (0.5-1.3): (5.9-6.9): (0.4-2).
6. The high strength, corrosion resistant, low nickel welding electrode of claim 5, wherein: in the titanium-iron-carbon alloy powder, Ti: fe: the mass ratio of C is 6.5: 3.28: 0.22.
7. use of the high strength corrosion resistant low nickel electrode of any one of claims 1 to 6 in marine steel welding.
8. Use according to claim 7, characterized in that: before welding, the welding rod is put into a welding rod drying furnace and baked for 1-2 hours at 380-400 ℃; the polarity of the power supply adopts direct current reverse connection, and the current is controlled at 140-170A; short arc welding is adopted, the welding bead temperature is controlled at 120-150 ℃, and the welding heat input is 10-25 KJ/mm.
9. The use of the high strength corrosion resistant low nickel electrode of any one of claims 1 to 6 in welding of high strength maritime work steel grade Q690E.
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