CN110653515B - Seamless submerged arc flux-cored wire for welding high manganese steel LNG storage tank - Google Patents
Seamless submerged arc flux-cored wire for welding high manganese steel LNG storage tank Download PDFInfo
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- CN110653515B CN110653515B CN201911049624.1A CN201911049624A CN110653515B CN 110653515 B CN110653515 B CN 110653515B CN 201911049624 A CN201911049624 A CN 201911049624A CN 110653515 B CN110653515 B CN 110653515B
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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
- B23K35/02—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
- B23K35/0244—Powders, particles or spheres; Preforms made therefrom
- B23K35/025—Pastes, creams, slurries
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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
Abstract
The invention discloses a seamless submerged arc flux-cored wire for welding a high manganese steel LNG storage tank, which consists of a sheath and flux-cored powder, wherein the flux-cored powder accounts for 30-40% of the total weight of the wire, and the flux-cored powder comprises the following components in parts by weight: 75-85 parts of manganese metal, 4-8 parts of chromium carbide, 1-3.5 parts of chromium metal, 3-5 parts of molybdenum metal, 0.5-1.5 parts of ferrosilicon, 1-2 parts of ferrotitanium, 0-8 parts of iron powder, 0.5-1 part of aluminum oxide and 0.5-1 part of fluorite. The flux-cored wire has good manufacturability, excellent toughness at-196 ℃ and low cost, and is suitable for welding the high manganese steel LNG storage tank.
Description
Technical Field
The invention relates to the technical field of welding materials, in particular to a seamless submerged arc flux-cored wire for welding a high manganese steel LNG storage tank.
Background
With the shortage of petroleum resources in China and the increase of the environmental protection strength of China, natural gas (LNG) is more and more emphasized as clean energy, so the transportation and storage requirements of the natural gas are increased. Currently, 9Ni steel, aluminum alloy, austenitic stainless steel and high manganese steel are mainly used as materials for LNG storage tanks, wherein 9Ni steel is most used, but the construction cost is also highest. The high manganese steel is the material with the lowest construction cost of the LNG storage tank, but the research on the matched welding materials of the high manganese steel LNG storage tank is relatively laggard.
The main patents that can be retrieved about welding materials for welding high manganese steel are: chinese patent with publication number CN107052618A discloses a C-Mn-Ni-W solid welding wire; chinese patent with publication number CN109530881A discloses a solid welding wire of C-Mn-Ni-Cr-Mo series; chinese patent with publication number CN109530964A discloses a C-Mn-Ni-Cr-W series seamed flux-cored wire. However, in the above patents, Ni is contained in an amount of 5% to 10%, which not only increases the cost of the welding wire, but also causes inconsistency between the composition of the cladding metal and that of the base metal, easily causes composition segregation in the welding heat affected zone, and easily causes thermal cracking after welding. Moreover, the solid welding wire for welding the high manganese steel has obvious processing and hardening in the drawing link in the preparation process, and needs to increase the annealing times, thereby increasing the production process and the manufacturing cost. The seamed submerged arc welding wire for welding the high manganese steel is easy to have the problems of powder stringing, untight package, uneven powder and the like in the preparation process, and is easy to have air holes in the welding process.
Compared with a solid welding wire, the seamless submerged arc flux-cored wire is convenient to adjust, equivalent in mechanical property, short in production period and low in cost; compared with the seamed submerged arc welding wire, the submerged arc welding wire has the advantages of no moisture absorption, no distortion and copper plating, the powder is densely filled, and the wire feeding and the electrical conductivity are good. Therefore, a seamless submerged arc flux-cored wire is needed to weld the high manganese steel LNG storage tank, which has a composition similar to that of the base metal (i.e., high manganese steel) and has good welding manufacturability.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides the seamless submerged arc flux-cored wire for welding the high manganese steel LNG storage tank, which has good manufacturability, excellent toughness at-196 ℃ and low cost.
In order to achieve the purpose, the invention adopts the specific scheme that:
a seamless submerged arc flux-cored wire for welding a high manganese steel LNG storage tank comprises a sheath and flux-cored powder, wherein the flux-cored powder accounts for 30-40% of the total weight of the wire, and the flux-cored powder comprises the following components in parts by weight: 75-85 parts of manganese metal, 4-8 parts of chromium carbide, 1-3.5 parts of chromium metal, 3-5 parts of molybdenum metal, 0.5-1.5 parts of ferrosilicon, 1-2 parts of ferrotitanium, 0-8 parts of iron powder, 0.5-1 part of aluminum oxide and 0.5-1 part of fluorite.
Preferably, the chemical components of the deposited metal of the flux-cored wire are as follows: 75 parts of manganese metal, 4 parts of chromium carbide, 3.5 parts of chromium metal, 5 parts of molybdenum metal, 1 part of ferrosilicon, 2 parts of ferrotitanium, 8 parts of iron powder, 0.5 part of aluminum oxide and 1 part of fluorite.
Preferably, the chemical components of the deposited metal of the flux-cored wire are as follows: 0.2-0.5% of C, 0.5-2.0% of Si, 20.0-26.0% of Mn, 2.0-5.0% of Cr2, 1.0-2.0% of Mos, less than or equal to 0.008% of S and less than or equal to 0.01% of P.
Preferably, the outer skin is made of a low-carbon steel strip, and the outer skin comprises the following elements in percentage by mass: less than or equal to 0.06 percent of C, less than or equal to 0.02 percent of Si, 0.1-0.4 percent of MnS, less than or equal to 0.01 percent of S, less than or equal to 0.015 percent of P, and more than or equal to 98 percent of Fe.
The preparation method comprises the steps of firstly pressing the outer skin into a U shape through a forming unit, synchronously adding the flux-cored powder on line, closing the outer skin added with the flux-cored powder under the pressing of the forming unit to form a flux-cored wire blank with an O-shaped section, welding the flux-cored wire blank at the closed position through high-frequency welding to enable the seamed pipe to be a seamless pipe, and then annealing, drawing and copper plating to prepare the seamless submerged arc flux-cored wire with the diameter of 3.2-4.0 mm.
The seamless submerged arc flux-cored wire is designed according to the following steps:
metal manganese: the transition manganese element is added in 75-85 parts by weight, and the manganese content in the deposited metal is 20.0-26.0% and is basically consistent with that of the parent metal. Within this range, the formation of epsilon-martensite can be suppressed, and the weld metal has better austenite phase stability. The addition amount is insufficient, and the effect is not obvious; with the increase of the manganese content, the ductile-brittle transition temperature is reduced and continuously increased; the composition segregation occurs and the impact power is significantly reduced.
And (3) chromium carbide: transition carbon element and chromium element. Compared with the transition carbon element in the form of graphite, the transition carbon element in the form of chromium carbide has better powder uniformity, the prepared welding wire has good stability, the transition coefficient is good during welding, the welding wire is not easily influenced by welding conditions, deposited metal components are more stable, and the stability of mechanical properties can be ensured. Carbon is an austenite forming element that stabilizes austenite and suppresses the formation of the epsilon phase. The carbon has a greater influence on the strength, and as the carbon content increases, the yield strength and tensile strength increase simultaneously. And the carbon can improve the impact toughness of the high manganese alloy welding seam in a larger range. When the carbon content exceeds 0.5%, the strength increases, the toughness decreases sharply, and the tendency to crater cracking increases. Therefore, the addition amount of the chromium carbide is 4-8 parts.
Metallic chromium: the transition chromium element needs to be supplemented in the form of metallic chromium because the addition amount of chromium carbide is limited. The total chromium element in the invention is controlled to be 2.0-5.0%, and is basically consistent with the chromium content in the parent metal. Chromium contributes to the improvement of strength and low-temperature toughness. The addition amount of chromium element is small, the effect is not obvious, the low-temperature impact toughness is improved along with the improvement of chromium content, and after the chromium content exceeds 5%, the structure can be changed, martensite is generated, and the toughness is reduced. Therefore, the addition amount of the metal chromium is 1-3.5 parts.
Molybdenum metal: the molybdenum can play a role in toughening a crystal boundary, and 3-5 parts of molybdenum is added in the invention, so that the low-temperature impact toughness of the deposited metal can be improved, and the generation of crater cracks can be reduced. When the molybdenum is not added in enough, the effect is not obvious, and when the molybdenum is added in too much, the metal structure of the welding line is changed, and the toughness is reduced.
Silicon iron: in the invention, silicon plays roles in deoxidizing and improving weld joint spreading, the weld joint deoxidizing is insufficient when the adding amount is low, the toughness of weld joint deposited metal is reduced when the adding amount is excessive, and the tendency of generating crater cracks is increased. Therefore, the ferrosilicon content is controlled to be 0.5-1.5 parts.
Titanium iron: the ferrotitanium has the main function of deoxidation, and the addition of the ferrotitanium is too low, so that the deoxidation is insufficient; an excessively large amount of addition results in a decrease in toughness. The adding amount of the ferrotitanium is controlled to be 1-2 parts.
Iron powder: the invention mainly plays a role in adjusting the powder filling rate so as to adapt to welding wire production under different conditions.
Alumina and fluorite: the invention mainly plays a role in adjusting the flowability of the medicinal powder so as to ensure that the medicinal powder flows uniformly.
S, P: sulfur and phosphorus are harmful elements in the welding seam. The sulfur and the iron can form FeS, and are easy to segregate when a molten pool is solidified, and are distributed in a crystal boundary in a low-melting-point eutectic mode, so that the tendency of generating crystal cracks in weld metal is increased, and the impact toughness is also reduced. After being combined with iron, the phosphorus is distributed in the crystal boundary, so that the binding force between crystal grains is weakened, and the cold brittleness of the weld metal is increased. Phosphorus can promote the formation of crystal cracks in austenitic steel welding seams, so the content of sulfur and phosphorus needs to be controlled, and the invention controls S to be less than or equal to 0.008 percent and P to be less than or equal to 0.01 percent.
Has the advantages that:
(1) the seamless flux-cored wire has extremely strong moisture absorption resistance, and is matched with a high-aluminum type sintered flux SR-SJ206, so that the welding flux has excellent manufacturability. (2) The seamless flux-cored wire adopts an alloy system with the components close to those of the base metal, so that the change of the structure and the performance of a fusion area caused by the diffusion of alloy elements is avoided. (3) The deposited metal has good obdurability matching, excellent low-temperature toughness and summer specific impact energy at-196 ℃ of more than 60J, and can be used for welding high manganese steel LNG storage tanks. (4) Compared with a solid welding wire, the seamless flux-cored wire has the advantages that the production procedures are reduced, the production period is shortened, and the cost is lower; compared with the seamed submerged arc welding wire, the submerged arc welding wire has the advantages of no moisture absorption, no distortion and copper plating, and the powder is densely filled, and the wire feeding and the electrical conductivity are good.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to specific embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, belong to the scope of the present invention.
The seamless submerged arc flux-cored wire for the high manganese steel LNG storage tank comprises a sheath and flux-cored powder, wherein the flux-cored powder accounts for 30-40% of the total weight of the wire, and the flux-cored powder comprises the following components in parts by weight: 75-85 parts of manganese metal, 4-8 parts of chromium carbide, 1-3.5 parts of chromium metal, 3-5 parts of molybdenum metal, 0.5-1.5 parts of ferrosilicon, 1-2 parts of ferrotitanium, 0-8 parts of iron powder, 0.5-1 part of aluminum oxide and 0.5-1 part of fluorite.
The chemical components of the flux-cored wire deposited metal are as follows: 0.2-0.5% of C, 0.5-2.0% of Si, 20.0-26.0% of Mn, 2.0-5.0% of Cr2, 1.0-2.0% of Mos, less than or equal to 0.008% of S and less than or equal to 0.01% of P.
The outer skin is made of a low-carbon steel strip, and the outer skin comprises the following elements in percentage by mass: less than or equal to 0.06 percent of C, less than or equal to 0.02 percent of Si, 0.1-0.4 percent of MnS, less than or equal to 0.01 percent of S, less than or equal to 0.015 percent of P, and more than or equal to 98 percent of Fe.
The preparation method of the seamless submerged arc flux-cored wire comprises the steps of firstly pressing a sheath into a U shape through a forming unit, synchronously adding flux-cored powder on line, pressing the sheath added with the flux-cored powder by the forming unit to form a flux-cored wire blank with an O-shaped section, welding the flux-cored wire blank at the joint by adopting high-frequency welding to enable a seamed pipe to be a seamless pipe, and then annealing, drawing, copper plating and coiling and packaging to prepare the seamless submerged arc flux-cored wire with the diameter of 3.2-4.0 mm.
The various starting materials used in the following examples, unless otherwise specified, were conventional commercially available products. The present invention will be described in further detail with reference to specific examples, but the embodiments of the present invention are not limited thereto.
Component examples
The invention provides a seamless submerged arc flux-cored wire for welding a high manganese steel LNG storage tank, which comprises flux-cored powder and a sheath, wherein the sheath is a low-carbon steel strip, and the chemical components of the steel strip are shown in Table 1.
Table 1 seamless submerged arc flux-cored wire using chemical composition of steel strip (%)
| C | Si | Mn | S | P | Fe |
| 0.058 | 0.0089 | 0.244 | <0.0050 | 0.014 | Balance of |
The powder composition and filling ratio of the seamless submerged arc flux-cored wires of examples 1-3 are shown in table 2.
TABLE 2 core powder ratio (/ part) and filling ratio of seamless submerged arc flux-cored wire in examples 1-3
| Numbering | Example 1 | Example 2 | Example 3 |
| Manganese metal | 85 | 80 | 75 |
| Metallic chromium | 1 | 2 | 3.5 |
| Chromium carbide | 8 | 6 | 4 |
| Metallic molybdenum | 3 | 4 | 5 |
| Silicon iron | 0.5 | 1.5 | 1 |
| Ferrotitanium | 1.5 | 1 | 2 |
| Iron powder | 0 | 4 | 8 |
| Alumina oxide | 0.5 | 1 | 0.5 |
| Fluorite | 0.5 | 0.5 | 1 |
| Filling rate | 32％ | 35％ | 38％ |
Effects of the embodiment
The welding wires prepared in examples 1 to 3 were combined with SR-SJ206 flux, and tests of chemical components and mechanical properties of the clad metal were performed. The test plate adopts a 25Mn low-temperature steel plate (one kind of high manganese steel) with the thickness of 20mm, and the steel plate mainly comprises the following components: 0.2-0.6% of C, 0.1-0.2% of Si, 23.0-26.0% of Mn and 2.0-5.0% of Cr2. Taking a welding wire with phi 3.2mm as an example, the welding process parameters are as follows: the welding power supply is in direct-current reverse connection, the welding current is 400-450A, the welding voltage is 28-30V, the walking speed is 40-45 cm/min, the inter-road temperature is lower than 150 ℃, and the chemical composition and mechanical property results of deposited metal are shown in tables 3 and 4 respectively.
TABLE 3 seamless submerged arc flux cored wire prepared in examples 1-3 matching SR-SJ206 flux deposit metal chemistry (%)
| C | Si | Mn | P | S | Cr | Mo | Fe | |
| Example 1 | 0.45 | 0.82 | 20.36 | 0.008 | 0.005 | 4.31 | 1.33 | Balance of |
| Example 2 | 0.33 | 1.33 | 22.61 | 0.008 | 0.005 | 2.26 | 1.55 | Balance of |
| Example 3 | 0.23 | 1.05 | 25.22 | 0.010 | 0.008 | 3.12 | 1.96 | Balance of |
TABLE 4 mechanical Properties of seamless submerged arc flux-cored wire matching SR-SJ206 flux deposit metals prepared in examples 1-3
| Rp0.2/MPa | Rm/MPa | A/％ | -196℃KV2/J | |
| Example 1 | 438 | 759 | 39.0 | 60、65、64 |
| Example 2 | 445 | 750 | 40.0 | 66、72、70 |
| Example 3 | 461 | 801 | 46.5 | 78、73、70 |
As can be seen from tables 3 and 4, the deposited metal chemical composition and mechanical properties of the seamless submerged arc flux-cored wires prepared in examples 1 to 3 both meet the requirements of the seamless submerged arc flux-cored wires. In examples 1 to 3, the charpy impact energy was gradually increased, and it was found that, in the ranges corresponding to the respective elements, increasing the Mn content and the Mo content while appropriately decreasing the C content contributes to the improvement of the charpy impact energy of the welding wire, in combination with the chemical composition analysis of the deposited metal.
The seamless submerged arc flux-cored wire prepared by the invention has strong moisture absorption resistance, is matched with a high-aluminum type sintered flux SR-SJ206, has stable welding arc and attractive appearance, has summer specific impact energy of more than 60J at-196 ℃, and can be used for welding a high manganese steel LNG storage tank.
The foregoing is merely a preferred embodiment of the invention and is not to be construed as limiting the invention in any way. All equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (5)
1. The seamless submerged arc flux-cored wire for welding the high manganese steel LNG storage tank is composed of a sheath and flux-cored powder, and is characterized in that the flux-cored powder accounts for 30-40% of the total weight of the wire, and the flux-cored powder comprises the following components in parts by weight: 75-85 parts of manganese metal, 4-8 parts of chromium carbide, 1-3.5 parts of chromium metal, 3-5 parts of molybdenum metal, 0.5-1 part of ferrosilicon, 1-2 parts of ferrotitanium, 0-8 parts of iron powder, 0.5-1 part of aluminum oxide and 0.5-1 part of fluorite.
2. The seamless submerged arc flux-cored wire for welding the high manganese steel LNG storage tank according to claim 1, characterized in that the flux-cored powder comprises the following components in parts by weight: 75 parts of manganese metal, 4 parts of chromium carbide, 3.5 parts of chromium metal, 5 parts of molybdenum metal, 1 part of ferrosilicon, 2 parts of ferrotitanium, 8 parts of iron powder, 0.5 part of aluminum oxide and 1 part of fluorite.
3. The seamless submerged arc flux-cored wire for welding the high manganese steel LNG storage tank according to claim 1, wherein the chemical components of deposited metal of the flux-cored wire are as follows: 0.2-0.5% of C, 0.5-2.0% of Si, 20.0-26.0% of Mn, 2.0-5.0% of Cr, 1.0-2.0% of Mo, less than or equal to 0.008% of S and less than or equal to 0.01% of P.
4. The seamless submerged arc flux-cored wire for welding the high manganese steel LNG storage tank as claimed in claim 1, wherein the sheath is made of a low carbon steel strip, and the low carbon steel strip comprises the following elements in percentage by mass: less than or equal to 0.06 percent of C, less than or equal to 0.02 percent of Si, 0.1-0.4 percent of Mn, less than or equal to 0.01 percent of S, less than or equal to 0.015 percent of P, and more than or equal to 98 percent of Fe.
5. The seamless submerged arc flux-cored wire for welding the high manganese steel LNG storage tank as claimed in claim 1, wherein the preparation method comprises the steps of firstly pressing the outer skin into a U shape through a forming unit, synchronously adding the flux-cored powder on line, pressing a flux-cored wire blank with a closed opening and an O-shaped cross section through the outer skin after the flux-cored powder is added through the forming unit, welding the blank at the closed opening through high-frequency welding to enable the seamed pipe to be a seamless pipe, and then annealing, drawing and copper plating to prepare the seamless submerged arc flux-cored wire with the diameter of 3.2-4.0 mm.
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| CN111660035B (en) * | 2020-05-07 | 2022-04-19 | 中国船舶重工集团公司第七二五研究所 | Tungsten electrode argon arc seamless flux-cored wire for ultralow-temperature high-manganese steel welding and preparation method thereof |
| CN111790999A (en) * | 2020-06-28 | 2020-10-20 | 昆山京群焊材科技有限公司 | Flux combination of metal powder core submerged arc welding wire for 25Mn austenitic steel |
| CN113414518A (en) * | 2021-06-09 | 2021-09-21 | 株洲湘江电焊条有限公司 | Low-dust multipurpose high-manganese steel flux-cored wire and preparation process thereof |
| CN114749773B (en) * | 2022-04-01 | 2023-12-15 | 南京钢铁股份有限公司 | Submerged arc welding method for 7% Ni storage tank steel |
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