CN111805120A - Consumable electrode solid welding wire for welding extremely-low-temperature austenite high-manganese steel - Google Patents
Consumable electrode solid welding wire for welding extremely-low-temperature austenite high-manganese steel Download PDFInfo
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- CN111805120A CN111805120A CN202010762465.6A CN202010762465A CN111805120A CN 111805120 A CN111805120 A CN 111805120A CN 202010762465 A CN202010762465 A CN 202010762465A CN 111805120 A CN111805120 A CN 111805120A
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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
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
- B23K35/0261—Rods, electrodes, wires
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Abstract
The invention provides a consumable electrode solid welding wire for welding ultralow-temperature austenite high-manganese steel, which comprises the following chemical components of 0.40-0.55 wt% of C; 22-26 wt% of Mn; 0.30 to 0.70 weight percent of Si; p is less than or equal to 0.020 wt%; s is less than or equal to 0.010 wt%; cr: 2.5-5.0 wt%; ni: 1.5-4.0 wt%; mo: 1.0-3.0 wt%; 0.20-0.90 wt% of Cu; v: 0.03-0.20 wt%; nb: 0.01-0.05 wt%; the total of inevitable impurity elements is less than or equal to 0.3 wt%; the balance of Fe, and the sum of the mass percentages of the components is 100%. The solid welding wire has relatively low price, and the formed deposited metal has high toughness at ultralow temperature (-196 ℃) and strength matched with low-temperature austenite high-manganese steel.
Description
Technical Field
The invention belongs to the field of consumable electrode solid welding wires, and particularly relates to a consumable electrode solid welding wire for welding ultralow-temperature austenite high-manganese steel.
Background
Liquefied Natural Gas (LNG) is produced by purifying natural gas and then converting the natural gas from a gaseous state to a liquid state, and as the price of petroleum continuously increases, the demand for alternative energy and diversification of energy demand is increasing, and the demand for LNG in various countries increases rapidly. The storage and transportation of liquefied natural gas must use a low-temperature special steel, and for a long time, 9Ni steel is mainly used on ships for storing and transporting liquefied natural gas, the use temperature of the steel can reach-196 ℃ at the lowest, but the steel contains higher Ni element, so the steel is expensive.
In recent years, austenitic high manganese steels have attracted attention because of their low cost and excellent ductility and toughness. Researches show that the low-temperature toughness, fatigue resistance, corrosion resistance and other properties of the austenitic high-manganese steel are equivalent to those of the 9% Ni steel widely applied at present. In addition, the price of metal manganese is lower than that of nickel element, and the material manufacturing cost can be greatly reduced by adopting high manganese steel, so that the high manganese steel has more obvious advantages than the traditional nickel-based low-temperature steel. In 11 months in 2010, the Korea Dayu shipbuilding shipyard, modern company, Dayu shipbuilding ocean company, Pupai iron and steel company and Wuda classification society jointly form a project named as 'co-development of high manganese steel and welding materials for extremely low temperature', and the project is successfully produced in batches after 5 years of effort. At present, low-temperature austenite high manganese steel also begins to enter a research and development stage in China, and the steel plate is manufactured by adopting a welding process for structure and equipment in an application process, so that research and development of a welding material matched with the high manganese steel is an indispensable important link in the use and development process of the high manganese steel.
For a consumable electrode solid welding wire of low-temperature austenite high-manganese steel, patent CN106938375 (applicable to a consumable electrode gas shielded welding wire with a working temperature of-196 ℃) discloses a consumable electrode solid welding wire which is applicable to low-temperature austenite high-manganese steel and used in a matched manner, the welding wire meets the requirements of good impact toughness at-196 ℃, the tensile strength is 582-695 MPa, the chemical components are equivalent to that of a base material, and the content of Ni element is 6.4-8.2 wt%. The tensile strength of the welding wire is less than 700MPa, and although the Mn content is increased and the Ni element content is reduced in the alloy components, 6.4-8.2 wt% of Ni still exists, so that the cost of the welding wire is increased to a certain extent.
Disclosure of Invention
The invention aims to provide a consumable electrode solid welding wire for welding extremely-low-temperature austenite high-manganese steel, which overcomes the defects of the prior art, reduces the Ni element content of the welding wire to be below 4 percent, greatly saves the cost and has relatively low price. The strength of austenite is enhanced by adding other strong carbide forming elements, so that the tensile strength of the weld metal is more than or equal to 700 MPa; the formed deposited metal has high toughness at ultralow temperature (-196 ℃) and the strength is matched with that of low-temperature austenite high manganese steel.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a consumable electrode solid welding wire for welding ultralow-temperature austenite high-manganese steel comprises the following chemical components of 0.40-0.55 wt% of C; 22-26 wt% of Mn; 0.30 to 0.70 weight percent of Si; p is less than or equal to 0.020 wt%; s is less than or equal to 0.010 wt%; cr: 2.5-5.0 wt%; ni: 1.5-4.0 wt%; mo: 1.0-3.0 wt%; 0.20-0.90 wt% of Cu; v: 0.03-0.20 wt%; nb: 0.01-0.05 wt%; the total of inevitable impurity elements is less than or equal to 0.3 wt%; the balance of Fe, and the sum of the mass percentages of the components is 100%.
Preferably, the chemical composition is 0.40-0.45 wt% of C; 23-25 wt% of Mn; 0.40 to 0.50 weight percent of Si; p is less than or equal to 0.020 wt%; s is less than or equal to 0.010 wt%; cr: 3.4-3.8 wt%; ni: 2.3-3.0 wt%; mo: 1.4-2.0 wt%; 0.40-0.60 wt% of Cu; v: 0.06-0.10 wt%; nb: 0.025-0.04 wt%; the total of inevitable impurity elements is less than or equal to 0.3 wt%; the balance of Fe, and the sum of the mass percentages of the components is 100%.
Preferably, the diameter of the consumable electrode solid welding wire is phi 1.0-1.6 mm.
The invention also provides the application of the consumable electrode solid welding wire in the welding of the ultralow-temperature austenite high-manganese steel.
Preferably, during welding, the protective gas is 80 vol% argon and 20 vol% carbon dioxide, and the gas flow is 15-20L/min.
Preferably, the welding current is 280-300A, the arc voltage is 28-30V, the welding speed is 36-45 cm/min, and the welding line energy is 10.5-15 KJ/cm.
Preferably, the suitable temperature range is ≧ 196 ℃.
The invention also provides the application of the consumable electrode solid welding wire in the welding of the ultralow-temperature austenite high-manganese steel structure of the liquefied natural gas storage and transportation container.
The Mn content of the main alloy element adopted by the invention is 22-26 wt%, which is equivalent to the Mn content of low-temperature austenite high-manganese steel, and the element gradient caused by different components in the process of forming a welding joint by a welding wire and a base metal is avoided, so that the stability of the metal components and the structure of a welding seam is ensured.
If good impact toughness is to be ensured at-196 ℃, a stable austenitic structure must be obtained. C. Both Mn and Ni elements are austenite forming elements, and a sufficient amount of austenite forming elements must be added to form a stable austenite structure, but Ni elements are expensive. Therefore, in order to reduce the cost, an alloy system with high manganese and low nickel is adopted, so that not only is the austenite structure ensured, and good ultralow-temperature toughness is obtained, but also the production cost is reduced. C. Too high a Mn content results in a marked decrease in impact toughness. Therefore, the adding amount of the C element is 0.40-0.55 wt%, the adding amount of the Mn element is 22-26 wt%, and the adding amount of the Ni element is 1.5-4.0 wt%.
In the invention, silicon plays a role in deoxidizing and improving weld joint forming, and a certain amount of Si element can improve the fluidity of molten iron and improve the welding manufacturability of the welding wire. However, excessive addition of Si causes deterioration of toughness of deposited metal and increases the tendency of weld cracking, so that the amount of Si added is 0.30 to 0.70 wt%.
Although the stable austenitic structure has good ultralow-temperature toughness, the strength and hardness are lower under the normal condition, in order to improve the strength of welded deposited metal, various composite strengthening modes are needed, and in consideration of the fact that austenitic steel cannot be strengthened by a mode of forming a hardening phase, measures such as solid solution strengthening, dispersion precipitation strengthening, fine grain strengthening and the like can be generally adopted, so that a certain amount of chromium and molybdenum elements are added in the project to improve the strength, and meanwhile, a small amount of strong carbide forming elements such as vanadium and niobium are added, and the dispersion precipitation strengthening effect is realized by forming carbides. If the content of these elements is too high, the structure is changed and the toughness is reduced. The Cu element can also enlarge the austenite forming phase region, and is advantageous for forming a stable austenite structure, but the Cu element is only partially dissolved in austenite, and is dissolved in a limited amount with austenite, and cannot be added in a large amount. Therefore, the addition of Cr element is 2.5-5.0 wt%, the addition of Mo element is 1.0-3.0 wt%, and the addition of Cu element is 0.20-0.90 wt%; v: 0.03-0.20 wt%; nb: 0.01-0.05 wt%.
Sulfur and phosphorus are harmful elements in deposited metals. Sulphur is most hazardous when present in the form of FeS, it segregates easily as the weld pool solidifies, increasing the tendency of the weld metal to develop crystal cracks, and also reducing impact toughness. Phosphorus has high solubility in liquid iron, but the solubility in solid iron is only a few thousandth, phosphorus and iron easily form iron phosphide, and the iron phosphide is often distributed in grain boundaries, so that the cold brittleness of weld metal is increased, and the impact toughness is reduced. Therefore, the invention controls the contents of sulfur and phosphorus to be less than or equal to 0.010 weight percent and P to be less than or equal to 0.020 weight percent.
Compared with the prior art, the consumable electrode solid welding wire for welding the ultralow-temperature austenite high-manganese steel has the following advantages:
the alloy component system of the solid welding wire is close to that of the low-temperature austenite high-manganese steel base metal, and only a small amount of Ni element is added, so that the stability of the metal structure and the components of a welded seam after welding is ensured, and the price of the product is reduced as much as possible. The stable austenitic structure provides the weld metal with good ultra-low temperature impact toughness and sufficient strength. The solid welding wire deposited metal has the mechanical properties of yield strength of more than or equal to 400MPa, tensile strength of more than or equal to 700MPa and elongation of more than or equal to 25 percent, and impact energy Akv of more than or equal to 41J at the temperature of 196 ℃ below zero, so that the mechanical property requirement and the ultra-low temperature toughness requirement of the ultra-low temperature high manganese steel at the working temperature of 196 ℃ below zero are met.
Detailed Description
The present invention will be described in detail with reference to examples.
Example 1
A consumable electrode solid welding wire (hereinafter referred to as consumable electrode solid welding wire) for welding ultralow-temperature austenite high-manganese steel. The consumable electrode solid welding wire comprises the following chemical components: 0.45 wt% of C, 23.64 wt% of Mn, 0.50 wt% of Si, 3.99 wt% of Cr, 2.62 wt% of Ni, 1.45 wt% of Mo, 0.47 wt% of Cu, 0.10 wt% of V, 0.033 wt% of Nb, 0.015 wt% of P, 0.009 wt% of S, and the balance of Fe and inevitable impurities, the sum of the mass fractions of the components being 100%.
The consumable electrode solid welding wire has the diameter of phi 1.2mm, a consumable electrode gas shielded welding method is adopted, a welding test plate is 20mm thick, and the thickness of a wrapping edge is 6mm by using the product of the invention as a base material.
The groove form of the welding test plate is Y-shaped, and the angle of the groove on one side is 10 degrees.
In this embodiment, the shielding gas is a mixed gas: 80 vol% argon gas and 20 vol% CO2, and the gas flow is 15-20L/min.
In this embodiment: the welding current is 280-300A, the arc voltage is 28-30V, the welding speed is 36-45 cm/min, and the welding line energy is 10.5-15 KJ/cm.
The welded weld metal microstructure and mechanical properties of the embodiment are detected and analyzed: the weld metal is a fully austenitic structure; no solidification crack and reheating crack are generated; the yield strength of the weld metal is 560MPa, the tensile strength is 750MPa, the elongation A is 30%, and the average value Akv of the impact work at-196 ℃ is 58-66J.
The experimental results of this example show that: after the consumable electrode solid welding wire for welding the ultralow-temperature austenite high-manganese steel prepared by the embodiment is welded by consumable electrode gas shielded welding, the mechanical property of the weld metal completely meets the welding technical requirement of the ultralow-temperature high-manganese steel.
Example 2
A consumable electrode solid welding wire for welding ultralow-temperature austenite high-manganese steel. The procedure of example 1 was followed, except that:
the consumable electrode solid welding wire comprises the following chemical components: 0.40 wt% of C, 24.64 wt% of Mn, 0.45 wt% of Si, 3.88 wt% of Cr, 2.42 wt% of Ni, 1.55 wt% of Mo, 0.57 wt% of Cu, 0.08 wt% of V, 0.035 wt% of Nb, 0.019 wt% of P, 0.007 wt% of S and the balance of Fe and inevitable impurities, wherein the sum of the mass fractions of the components is 100%.
The diameter of the consumable electrode solid welding wire is phi 1.2 mm.
The welded weld metal microstructure and mechanical properties of the embodiment are detected and analyzed: the weld metal is a fully austenitic structure; no solidification crack and reheating crack are generated; the yield strength of the weld metal is 473MPa, the tensile strength is 703MPa, the elongation A is 39%, and the average value Akv of the impact work at-196 ℃ is 62-77J.
Example 3
A consumable electrode solid welding wire for welding ultralow-temperature austenite high-manganese steel. The procedure of example 1 was followed, except that:
the consumable electrode solid welding wire comprises the following chemical components: 0.42 wt% of C, 23.64 wt% of Mn, 0.43 wt% of Si, 3.87 wt% of Cr, 2.42 wt% of Ni, 1.68 wt% of Mo, 0.57 wt% of Cu, 0.07 wt% of V, 0.035 wt% of Nb, 0.017 wt% of P, 0.007 wt% of S, and the balance of Fe and inevitable impurities, wherein the sum of the mass fractions of the components is 100%.
The diameter of the consumable electrode solid welding wire is phi 1.2 mm.
The welded weld metal microstructure and mechanical properties of the embodiment are detected and analyzed: the weld metal is a fully austenitic structure; no solidification crack and reheating crack are generated; the yield strength of the weld metal is 485MPa, the tensile strength is 712MPa, the elongation A is 43 percent, and the average value Akv of the impact work at-196 ℃ is 64-76J.
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 (8)
1. A melting electrode solid welding wire for welding of extremely low temperature austenite high manganese steel is characterized in that: the chemical components are 0.40 to 0.55 weight percent of C; 22-26 wt% of Mn; 0.30 to 0.70 weight percent of Si; p is less than or equal to 0.020 wt%; s is less than or equal to 0.010 wt%; cr: 2.5-5.0 wt%; ni: 1.5-4.0 wt%; mo: 1.0-3.0 wt%; 0.20-0.90 wt% of Cu; v: 0.03-0.20 wt%; nb: 0.01-0.05 wt%; the total of inevitable impurity elements is less than or equal to 0.3 wt%; the balance of Fe, and the sum of the mass percentages of the components is 100%.
2. The consumable electrode solid wire for very low temperature austenitic high manganese steel welding according to claim 1, characterized in that: the chemical components are 0.40 to 0.45 weight percent of C; 23-25 wt% of Mn; 0.40 to 0.50 weight percent of Si; p is less than or equal to 0.020 wt%; s is less than or equal to 0.010 wt%; cr: 3.4-3.8 wt%; ni: 2.3-3.0 wt%; mo: 1.4-2.0 wt%; 0.40-0.60 wt% of Cu; v: 0.06-0.10 wt%; nb: 0.025-0.04 wt%; the total of inevitable impurity elements is less than or equal to 0.3 wt%; the balance of Fe, and the sum of the mass percentages of the components is 100%.
3. The consumable electrode solid wire for very low temperature austenitic high manganese steel welding according to claim 1, characterized in that: the diameter of the consumable electrode solid welding wire is phi 1.0-1.6 mm.
4. The use of the consumable electrode solid wire of any one of claims 1 to 3 in the welding of very low temperature austenitic high manganese steel.
5. Use according to claim 4, characterized in that: during welding, the protective gas is 80 vol% argon and 20 vol% carbon dioxide, and the gas flow is 15-20L/min.
6. Use according to claim 5, characterized in that: the welding current is 280-300A, the arc voltage is 28-30V, the welding speed is 36-45 cm/min, and the welding line energy is 10.5-15 KJ/cm.
7. Use according to claim 5, characterized in that: the suitable temperature range is more than or equal to 196 ℃ below zero.
8. The use of the consumable electrode solid welding wire according to any one of claims 1 to 3 for welding an ultra-low temperature austenite high manganese steel structure of a liquefied natural gas storage and transportation container.
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Cited By (7)
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| CN113458654A (en) * | 2021-06-30 | 2021-10-01 | 南京钢铁股份有限公司 | Ultralow-temperature high-manganese steel welding wire, welding rod and preparation method thereof |
| CN113458653A (en) * | 2021-06-30 | 2021-10-01 | 南京钢铁股份有限公司 | Submerged-arc welding wire for ultralow-temperature high-manganese steel and preparation method |
| CN113634948A (en) * | 2021-06-30 | 2021-11-12 | 南京钢铁股份有限公司 | CO of ultra-low temperature high manganese steel2Gas shielded welding wire and preparation method thereof |
| CN114289931A (en) * | 2022-01-30 | 2022-04-08 | 武汉科技大学 | Solid welding wire for submerged arc transverse welding of high-manganese austenitic low-temperature steel and welding process thereof |
| CN114289929A (en) * | 2022-01-30 | 2022-04-08 | 武汉科技大学 | MIG welding solid welding wire for high-manganese austenite low-temperature steel and welding process thereof |
| CN114749827A (en) * | 2022-04-24 | 2022-07-15 | 燕山大学 | Solid welding wire and preparation method and application thereof |
| CN116079278A (en) * | 2023-04-06 | 2023-05-09 | 中国科学院合肥物质科学研究院 | High-energy-absorption high-manganese steel solid welding wire and welding process thereof |
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| CN113458653A (en) * | 2021-06-30 | 2021-10-01 | 南京钢铁股份有限公司 | Submerged-arc welding wire for ultralow-temperature high-manganese steel and preparation method |
| CN113634948A (en) * | 2021-06-30 | 2021-11-12 | 南京钢铁股份有限公司 | CO of ultra-low temperature high manganese steel2Gas shielded welding wire and preparation method thereof |
| WO2023273159A1 (en) * | 2021-06-30 | 2023-01-05 | 南京钢铁股份有限公司 | Co2 gas shielded welding wire for ultra-low temperature high manganese steel and preparation method |
| WO2023273160A1 (en) * | 2021-06-30 | 2023-01-05 | 南京钢铁股份有限公司 | Submerged arc welding wire for ultra-low temperature high manganese steel, and preparation method |
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| CN114749827B (en) * | 2022-04-24 | 2022-12-20 | 燕山大学 | Solid welding wire and preparation method and application thereof |
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