CN112091478B - 900 MPa-grade high-strength high-low-temperature toughness low-hydrogen welding rod for ocean engineering - Google Patents
900 MPa-grade high-strength high-low-temperature toughness low-hydrogen welding rod for ocean engineering Download PDFInfo
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- CN112091478B CN112091478B CN202010983300.1A CN202010983300A CN112091478B CN 112091478 B CN112091478 B CN 112091478B CN 202010983300 A CN202010983300 A CN 202010983300A CN 112091478 B CN112091478 B CN 112091478B
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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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/40—Making wire or rods for soldering or welding
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Abstract
The invention provides a 900 MPa-grade high-strength high-low-temperature toughness low-hydrogen welding rod for ocean engineering, which consists of a welding core and a coating wrapped on the outer layer of the welding core, wherein the coating comprises 38-45 parts by mass of carbonate, 18-24 parts by mass of fluoride, 3-6 parts by mass of titanium dioxide, 3-6 parts by mass of quartz, 6-8 parts by mass of ferrotitanium, 1.3-2.0 parts by mass of ferrosilicon, 8-12 parts by mass of nickel powder, 1.6-2.4 parts by mass of ferromolybdenum, 0.3-0.8 part by mass of metallic chromium, 3-5 parts by mass of electrolytic manganese, 0.6-1.0 part by mass of sodium carbonate and 0.05-0.15 part by mass of ferroboron. The welding rod of the invention has good coating property, smooth and compact surface, high yield and no eccentricity. During welding, the welding arc is stable, splashing is less, welding lines are fine, the two sides of a welding bead and a groove are well wetted, and a slag shell can automatically fall off. The all-position welding performance is excellent, and the weld joint is attractive in forming.
Description
Technical Field
The invention belongs to the technical field of welding materials, and particularly relates to a 900 MPa-grade high-strength high-low-temperature toughness low-hydrogen welding rod for ocean engineering.
Background
At present, 690MPa grade high-strength steel is widely used in the field of ocean engineering, and matched welding materials have been developed by a plurality of domestic welding material manufacturers. In order to further reduce the weight of the platform, 790MPa grade high-strength steel for ocean engineering is developed at home (0.2% yield strength is more than or equal to 790MPa, tensile strength is 880-1020 MPa, elongation is more than or equal to 14%, and-60 ℃ impact energy is more than or equal to 69J). In order to match the application of the steel grade, the passive situation that domestic steel uses imported welding materials is avoided, and domestic development of matched welding materials needs to be synchronously carried out. At present, the European method liquid-air welding group can provide a high-toughness welding rod with 0.2 percent yield strength higher than 790MPa, but the price is high, the purchase period is long, and the urgent need of production cannot be met.
The invention patent with the patent number of 2016107787303 discloses a 790 MPa-grade high-strength and high-toughness welding rod for water and electricity and a preparation method thereof, but at present, no welding rod with the 0.2% yield strength of the welding state more than 790MPa and the impact energy higher than 69J at minus 60 ℃ exists in China, and the development of the welding rod has very important significance for promoting the rapid development of the ocean engineering manufacturing industry in China.
Disclosure of Invention
In order to solve the problems, the invention provides a 900 MPa-grade high-strength high-low temperature toughness low-hydrogen welding rod for ocean engineering and a preparation method thereof, which meet the welding requirement of 790 MPa-grade marine steel and are suitable for welding a 880 MPa-grade low-alloy steel structure.
The technical scheme adopted by the invention is as follows: a900 MPa-grade high-strength high-low-temperature toughness low-hydrogen welding rod for ocean engineering comprises a welding core and a coating wrapping the outer layer of the welding core, wherein the coating comprises 38-45 parts by mass of carbonate, 18-24 parts by mass of fluoride, 3-6 parts by mass of titanium dioxide, 3-6 parts by mass of quartz, 6-8 parts by mass of ferrotitanium, 1.3-2.0 parts by mass of ferrosilicon, 8-12 parts by mass of nickel powder, 1.6-2.4 parts by mass of ferromolybdenum, 0.3-0.8 part by mass of metallic chromium, 3-5 parts by mass of electrolytic manganese, 0.6-1.0 part by mass of soda and 0.05-0.15 part by mass of ferroboron.
Further optimizing, the welding core is H08HR low alloy steel welding core, the diameter deviation of the original wire of the welding core is +/-0.4 mm, and the ovality of the wire rod is less than or equal to 0.5 mm.
The mass percentage of each element contained in the core wire is further optimized to be 0.04-0.07 percent of C, 0.15-0.23 percent of Si, 0.40-0.70 percent of Mn0.01 percent of P and less than or equal to 0.01 percent of S, less than or equal to 0.005 percent of As, less than or equal to 0.005 percent of Sn, less than or equal to 0.005 percent of Sb, less than or equal to 0.01 percent of O, less than or equal to 0.01 percent of N, and the balance of Fe and inevitable impurities.
Further optimizing, in the components of the coating, CaCO3 in the carbonate is more than or equal to 96 percent, S is less than or equal to 0.02 percent, P is less than or equal to 0.02 percent, and the granularity requirement is 100 percent of minus 40 meshes; CaF in fluoride 2 ≥96％、SiO 2 Less than or equal to 2.0 percent, less than or equal to 0.1 percent of C, less than or equal to 0.02 percent of S, less than or equal to 0.02 percent of P, and the granularity requirement is 100 percent of minus 40 meshes; TiO in titanium dioxide 2 ≥96％、S≤0.02％、P≤0.02％，The granularity is required to be-40 meshes and 100 percent; quartz SiO 2 More than or equal to 96 percent, less than or equal to 0.02 percent of S, less than or equal to 0.02 percent of P, and the granularity requirement is 100 percent of minus 60 meshes; 25.0-35.0% of Ti, less than or equal to 0.2% of C, less than or equal to 4.5% of Si, less than or equal to 8.0% of Al, less than or equal to 0.03% of S, less than or equal to 0.03% of P, and the granularity requirement is 100% of minus 40 meshes; in the ferrosilicon, the Si content is 42-47%, the C content is less than or equal to 0.50%, the S content is less than or equal to 0.020%, the P content is less than or equal to 0.020%, and the granularity requirement is 100% of minus 40 meshes; 55.0-60.0% of Mo, less than or equal to 1.0% of Si, less than or equal to 0.20% of C, less than or equal to 0.020% of S, less than or equal to 0.080% of P in the ferromolybdenum, and the granularity requirement is 100 percent of minus 100 meshes; the Cr content in the metal chromium is more than or equal to 99.0 percent, the C content is less than or equal to 0.08 percent, the S content is less than or equal to 0.05 percent, the P content is less than or equal to 0.010 percent, and the granularity requirement is 100 percent of minus 40 meshes; the Ni content in the nickel powder is more than or equal to 99.5 percent, the C content is less than or equal to 0.06 percent, the S content is less than or equal to 0.003 percent, the P content is less than or equal to 0.003 percent, and the granularity requirement is 100 percent of-120 meshes; in the electrolytic manganese, Mn is more than or equal to 99.5 percent, C is less than or equal to 0.08 percent, S is less than or equal to 0.05 percent, P is less than or equal to 0.010 percent, and the granularity is required to be 100 percent of minus 60 meshes; na in soda ash 2 CO 3 More than or equal to 99 percent, NaCl less than or equal to 0.7 percent and granularity requirement of 100 percent of minus 60 meshes; 19.0-24.0% of B, less than or equal to 0.03% of S and less than or equal to 0.05% of P in ferroboron.
Further optimized, the coating comprises 45 parts by mass of carbonate, 18 parts by mass of fluoride, 3 parts by mass of titanium dioxide, 6 parts by mass of quartz, 8 parts by mass of ferrotitanium, 1.3 parts by mass of ferrosilicon, 12 parts by mass of nickel powder, 2.0 parts by mass of ferromolybdenum, 0.6 part by mass of chromium metal, 3.0 parts by mass of electrolytic manganese, 1.0 part by mass of soda ash and 0.05 part by mass of ferroboron.
The coating is further optimized to comprise 42 parts by mass of carbonate, 22 parts by mass of fluoride, 4 parts by mass of titanium dioxide, 4 parts by mass of quartz, 7 parts by mass of ferrotitanium, 2.0 parts by mass of ferrosilicon, 10 parts by mass of nickel powder, 1.6 parts by mass of ferromolybdenum, 0.8 part by mass of chromium metal, 4.1 parts by mass of electrolytic manganese, 0.8 part by mass of soda and 0.15 part by mass of ferroboron.
The coating is further optimized to comprise 38 parts by mass of carbonate, 24 parts by mass of fluoride, 6 parts by mass of titanium dioxide, 3 parts by mass of quartz, 6 parts by mass of ferrotitanium, 1.4 parts by mass of ferrosilicon, 8 parts by mass of nickel powder, 2.4 parts by mass of ferromolybdenum, 0.3 part by mass of chromium metal, 5 parts by mass of electrolytic manganese, 0.6 part by mass of soda and 0.1 part by mass of ferroboron.
The design principle of the traditional Chinese medicine coating formula of the welding rod is as follows:
welding of the inventionThe bar adopts CaO-CaF 2 -SiO 2 -TiO 2 The high alkalinity low hydrogen slag system can obtain good manufacturability and simultaneously keep the content of diffused hydrogen of deposited metal at a lower level by reasonably designing the proportion of each component of the coating. The deposited metal adopts an Si-Mn-Cr-Ni-Mo alloy system, and carries out micro-alloying adjustment through Ti and B, so that good toughness matching is obtained, and the deposited metal has certain crack resistance.
Carbonate salt: the carbonate is used in the welding rod and is decomposed into CaO and CO under the action of arc heat 2 The slag-making and gas-making material is a common slag-making and gas-making material in the manufacturing of welding rods, improves the alkalinity of slag, stabilizes electric arc, increases the interfacial tension and surface tension of the slag and metal, improves slag removal, and has better desulfurization and dehydrogenation capabilities.
Fluoride: the melting point and viscosity of the slag are adjusted, the fluidity of the slag is increased, the physical property of the slag is improved, the slag plays a key role in weld forming, slag removal and the like, and the slag is also a main material for reducing diffusible hydrogen in a weld, but due to the existence of fluorine, the arc is unstable and toxic gas is generated.
Quartz: the acid oxide is mainly added as a slag former to protect a molten pool, adjust the melting point of molten slag and improve weld forming, and is not suitable to be excessively added as an acid oxide.
Silicon iron: the ferrosilicon is a deoxidizer and a slag former, and can also ensure the strength of the welding seam. If the ferrosilicon content is too low, the ferrosilicon cannot be used as a slag former or a deoxidizer, and if the ferrosilicon content is too high, slag becomes glassy, so that slag inclusion in a weld bead is likely to occur, and the shape of the weld bead is likely to deteriorate.
Nickel powder: besides promoting the formation of acicular ferrite, nickel is also beneficial to reducing the fluctuation of impact value and lowering the low-temperature brittle transition temperature of weld metal, but the tendency of the weld to generate hot cracks is increased along with the increase of the content of nickel, so that the weld contains a certain amount of nickel and must be controlled in a proper range.
Ferromolybdenum: the iron alloy is adopted, so that the transition is stable, the fluctuation is small, and the strength can be effectively improved. The addition amount must be strictly controlled, molybdenum element, although greatly contributing to strength, even far more than carbon, manganese and other elements, also has obvious deterioration to impact toughness, so the addition amount of ferromolybdenum is generally controlled below 0.6% of molybdenum content in deposited metal. When the sum of the molybdenum content and the chromium content exceeds 1.20%, the strength of the weld metal excessively increases and the toughness deteriorates. In addition, cold cracking can occur.
Electrolytic manganese: the manganese improves the strength of weld metal, improves the toughness and has good deoxidation and desulfurization effects. Tests show that when the manganese reaches a certain value, the manganese content is increased to make little contribution to the strength and deteriorate the toughness.
The addition of soda ash and titanium dioxide is to ensure production and improve press-coating performance.
The ferroboron is added to improve the crack resistance of the deposited metal by the crack propagation of the boundary of the deposited metal.
The invention has the beneficial effects that:
1. the invention adopts CaO-CaF 2 -SiO 2 -TiO 2 The high-alkalinity low-hydrogen slag system can obtain good manufacturability and simultaneously keep the diffusible hydrogen content of deposited metal at a lower level by reasonably designing the component proportion of the coating, and the diffusible hydrogen content of the deposited metal of the welding rod is less than 4ml/100g, so that the probability of cold cracks in the welding process can be effectively reduced;
2. the deposited metal adopts an Si-Mn-Cr-Ni-Mo alloy system, and carries out micro-alloying adjustment through Ti and B, so that good toughness matching is obtained, and the deposited metal has certain crack resistance;
3. the welding rod adopts the high-purity carbon steel core, the length of a sleeve at the rear half section of the welding rod is moderate, the arc striking is easy, the welding operation performance is good, and the defect that the temperature rise and the melting at the rear half section are accelerated to be unfavorable for the welding operation due to the overhigh alloy content of the welding core is avoided;
4. the mechanical properties are good, the tensile strength of the welded performance is more than 900MPa, the elongation is more than 17%, and the low-temperature impact energy at minus 60 ℃ is more than 80J;
5. the production process has the advantages of excellent performance, stable electric arc, basically no splashing, good slag detachability, beautiful welding line formation and excellent all-position operation performance.
Detailed Description
The present invention will be described in more detail with reference to the following examples.
Example 1
The coating of the welding rod comprises 45 parts by mass of carbonate, 18 parts by mass of fluoride, 3 parts by mass of titanium dioxide, 6 parts by mass of quartz, 8 parts by mass of ferrotitanium, 1.3 parts by mass of ferrosilicon, 12 parts by mass of nickel powder, 2.0 parts by mass of ferromolybdenum, 0.6 part by mass of metallic chromium, 3.0 parts by mass of electrolytic manganese, 1.0 part by mass of soda and 0.05 part by mass of ferroboron.
The deposited metal composition percentage is C0.047%, Si 0.30%, Mn 1.44%, P0.006%, S0.003%, Cr 0.27%, Ni 5.42%, Mo 0.46%.
The raw materials are uniformly mixed, water glass with the ratio of potassium to sodium being 1:1 at 20 ℃ and the weight content of solid components being 20-23% is added, the Baume density is 41-43 Be, wet mixing is carried out, and welding rod preparation is carried out on H08HR core wires on oil pressure type welding rod production equipment. The welding rod is baked for 2-3 hours at 80-150 ℃ and then dried for 1.5-2 hours at 400-450 ℃.
In the welding process, a phi 4 welding rod is adopted, the current is 150-165A, the voltage is 22-26V, the welding speed is 180-220 mm/min, the interlayer temperature is 120-170 ℃, the heat input is 1.1-1.5 kJ/mm, and direct current is reversely connected.
Example 2
The other parts are the same as the example 1, except that the coating comprises 42 parts by mass of carbonate, 22 parts by mass of fluoride, 4 parts by mass of titanium dioxide, 4 parts by mass of quartz, 7 parts by mass of ferrotitanium, 2.0 parts by mass of ferrosilicon, 10 parts by mass of nickel powder, 1.6 parts by mass of ferromolybdenum, 0.8 part by mass of metallic chromium, 4.1 parts by mass of electrolytic manganese, 0.8 part by mass of soda and 0.15 part by mass of ferroboron.
The deposited metal comprises C0.053%, Si 0.42%, Mn 1.55%, P0.006%, S0.003%, Cr 0.36%, Ni 4.61%, and Mo 0.42%.
Example 3
The other parts are the same as the example 1, except that the coating comprises 38 parts by mass of carbonate, 24 parts by mass of fluoride, 6 parts by mass of titanium dioxide, 3 parts by mass of quartz, 6 parts by mass of ferrotitanium, 1.4 parts by mass of ferrosilicon, 8 parts by mass of nickel powder, 2.4 parts by mass of ferromolybdenum, 0.3 part by mass of chromium metal, 5 parts by mass of electrolytic manganese, 0.6 part by mass of soda and 0.1 part by mass of ferroboron.
The deposited metal comprises C0.050%, Si 0.36%, Mn 1.65%, P0.006%, S0.003%, Cr 0.21%, Ni 4.51% and Mo 0.52%.
When the 900 MPa-grade high-strength high-low-temperature toughness low-hydrogen welding rod for ocean engineering is used for welding, the electric arc is stable, basically no splashing exists, the slag removal performance is good, the all-position welding performance is excellent, the welding seam is attractive in appearance, and the welding bead is moderate in height. In the welding tests of the embodiments 1 to 3, the mechanical properties of the deposited metal are as follows: yield strength rp 0.2: 830MPa, tensile strength Rm: > 900MPa, elongation A: more than 18%, reduction of area Z: more than 55 percent, the-40 ℃ impact value is more than 100J, and the-60 ℃ impact value is more than 80J.
Claims (4)
1. A900 MPa-level high-strength high-low-temperature toughness low-hydrogen welding rod for ocean engineering comprises a welding core and a coating wrapped on the outer layer of the welding core, the coating is characterized by comprising 38-45 parts by mass of carbonate, 18-24 parts by mass of fluoride, 3-6 parts by mass of titanium dioxide, 3-6 parts by mass of quartz, 6-8 parts by mass of ferrotitanium, 1.3-2.0 parts by mass of ferrosilicon, 8-12 parts by mass of nickel powder, 1.6-2.4 parts by mass of ferromolybdenum, 0.3-0.8 part by mass of metallic chromium, 3-5 parts by mass of electrolytic manganese, 0.6-1.0 part by mass of soda and 0.05-0.15 part by mass of ferroboron, the welding core is a H08HR low alloy steel welding core, and the welding core comprises, by mass, 0.04-0.07% of C, 0.15-0.23% of Si, 0.40-0.70% of Mn, less than or equal to 0.01% of P, less than or equal to 0.01% of S, less than or equal to 0.005% of As, less than or equal to 0.005% of Sn, less than or equal to 0.005% of Sb, less than or equal to 0.01% of O, less than or equal to 0.01% of N, and the balance Fe and unavoidable impurities.
2. The 900 MPa-grade high-strength high-low-temperature toughness low-hydrogen welding rod for ocean engineering according to claim 1, which is characterized in that: the coating comprises, by mass, 45 parts of carbonate, 18 parts of fluoride, 3 parts of titanium dioxide, 6 parts of quartz, 8 parts of ferrotitanium, 1.3 parts of ferrosilicon, 12 parts of nickel powder, 2.0 parts of ferromolybdenum, 0.6 part of chromium metal, 3.0 parts of electrolytic manganese, 1.0 part of soda and 0.05 part of ferroboron.
3. The welding rod with high strength, high low temperature toughness and low hydrogen for the 900MPa level in ocean engineering as claimed in claim 1, wherein: the coating comprises 42 parts by mass of carbonate, 22 parts by mass of fluoride, 4 parts by mass of titanium dioxide, 4 parts by mass of quartz, 7 parts by mass of ferrotitanium, 2.0 parts by mass of ferrosilicon, 10 parts by mass of nickel powder, 1.6 parts by mass of ferromolybdenum, 0.8 part by mass of chromium metal, 4.1 parts by mass of electrolytic manganese, 0.8 part by mass of soda and 0.15 part by mass of ferroboron.
4. The welding rod with high strength, high low temperature toughness and low hydrogen for the 900MPa level in ocean engineering as claimed in claim 1, wherein: the coating comprises the components of 38 parts by mass of carbonate, 24 parts by mass of fluoride, 6 parts by mass of titanium dioxide, 3 parts by mass of quartz, 6 parts by mass of ferrotitanium, 1.4 parts by mass of ferrosilicon, 8 parts by mass of nickel powder, 2.4 parts by mass of ferromolybdenum, 0.3 part by mass of chromium metal, 5 parts by mass of electrolytic manganese, 0.6 part by mass of soda and 0.1 part by mass of ferroboron.
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| CN115338559B (en) * | 2022-08-18 | 2024-01-26 | 四川大西洋焊接材料股份有限公司 | Coating, welding rod and deposited metal |
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