WO2023273159A1 - 超低温高锰钢的co 2气体保护焊焊丝及制备方法 - Google Patents

超低温高锰钢的co 2气体保护焊焊丝及制备方法 Download PDF

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WO2023273159A1
WO2023273159A1 PCT/CN2021/135206 CN2021135206W WO2023273159A1 WO 2023273159 A1 WO2023273159 A1 WO 2023273159A1 CN 2021135206 W CN2021135206 W CN 2021135206W WO 2023273159 A1 WO2023273159 A1 WO 2023273159A1
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ultra
low temperature
high manganese
manganese steel
temperature high
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PCT/CN2021/135206
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English (en)
French (fr)
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黄一新
谯明亮
陈兴华
赵柏杰
肖丙政
孙超
邓伟
李松
李伟
张汪洋
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南京钢铁股份有限公司
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Publication of WO2023273159A1 publication Critical patent/WO2023273159A1/zh

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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
    • 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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  • the invention belongs to the technical field of CO2 gas shielded welding wire for high manganese steel, and in particular relates to a CO2 gas shielded welding wire for ultra-low temperature high manganese steel and a preparation method.
  • 9Ni steel is generally used for ultra-low temperature storage and transportation containers, and the matching welding materials are nickel-based welding wires.
  • the nickel content in the welding wire is 50-60%, which is expensive;
  • the composition of the base metal and the welding wire belong to different composition systems, and the alloy content is quite different, which will cause the diffusion of elements at the fusion line of the welded joint, and the change of structure and performance.
  • the purpose of this invention is to provide a CO gas shielded welding wire for ultra-low temperature high manganese steel, to solve the problem that there is no CO gas shielded welding wire suitable for preparing high manganese low temperature steel, and the existing nickel base wire is easy to cause Diffusion of elements at the fusion line of welded joints affects the microstructure and properties.
  • the CO2 gas shielded welding wire for ultra-low temperature high manganese steel according to the present invention its raw materials include, in parts by weight: 0.15-0.35 wt% of C, 23-25 wt% of Mn, and 0.60-0.90 wt% of Si %, Ni is 4.0-6.0wt%, Cr is 3.0-4.5wt%, P ⁇ 0.010wt%, S ⁇ 0.006wt%, and the balance is Fe and unavoidable impurities.
  • the preparation method of the CO 2 gas shielded welding wire for ultra-low temperature high manganese steel of the present invention is that the raw material is hot-rolled into a wire rod, and then drawn into a straight rod through multi-pass annealing, and copper-plated on the surface to prepare a welding wire.
  • the specification of the wire rod is ⁇ 5.5 mm, and the specification of the straight rod is ⁇ 1.2 mm.
  • the thickness of the copper plating layer is 0.19-0.23 microns.
  • the remarkable advantages lie in that the price of the alloy elements used in the present invention is low, the alloy composition system is simple, and the preparation cost is low.
  • the manganese content of the formed weld metal is equivalent to that of ultra-low temperature high manganese steel, which ensures that the composition system is basically the same as that of the base metal. When forming a welded joint, it avoids the change of the microstructure and mechanical properties near the fusion line formed by the diffusion of manganese. .
  • the manganese element, carbon element and nickel element are both austenite-forming elements, and when the weld metal molten pool is solidified, the austenite phase is used as the initial phase of solidification, and it is kept until room temperature to form austenite
  • the weld metal with body structure not only ensures the excellent ultra-low temperature toughness of the weld metal, the impact energy Akv is 69 ⁇ 93J at -196°C, but also ensures sufficient strength: the yield strength is 476 ⁇ 507MPa, and the tensile strength is 669 ⁇ 723MPa, the elongation A is 36 ⁇ 40%, which realizes the mechanical property requirements and ultra-low temperature toughness requirements of ultra-low temperature high manganese steel, and reduces the solidification temperature range, avoids the appearance of solidification cracks, and reduces or prevents liquefaction cracks and reheating at the same time The generation of cracks enables the weld metal to have mechanical properties matching that of the base metal.
  • the invention adds 4.0-6.0wt% nickel element, reduces the solidification temperature range, reduces and avoids solidification cracks, and effectively improves the low-temperature impact performance of weld deposit metal.
  • the invention adds 0.60-0.90wt% silicon element, which effectively improves the fluidity of molten steel in the molten pool during welding, and the welding wire has excellent manufacturability.
  • the present invention has low preparation cost and simple alloy composition system; excellent welding manufacturability; the formed weld metal has the characteristics of ultra-low temperature and high toughness, its strength matches that of ultra-low temperature high manganese steel, and the welded joint has high strength and excellent ultra-low temperature toughness
  • the mechanical properties can meet the technical requirements for the strength and ultra-low temperature toughness of the welded ultra-low temperature high manganese steel.
  • a CO2 gas shielded welding wire for ultra-low temperature high manganese steel the chemical composition of raw materials is: C is 0.25wt%, Mn is 23.5wt%, Si is 0.75wt%, Ni is 5.0wt%, Cr is 3.5wt% , P ⁇ 0.010wt%, S ⁇ 0.006wt%, and the balance is Fe and unavoidable impurities.
  • the above raw materials are hot-rolled into a ⁇ 5.5mm wire rod, and then drawn to a ⁇ 1.2mm specification through multiple annealing, and the surface is plated with 0.19-0.23 micron copper to prepare a welding wire.
  • the CO2 gas shielded welding method is used to weld 16mm thick ultra-low temperature high manganese steel.
  • the chemical composition of the ultra-low temperature high manganese steel is: C is 0.40-0.50wt%, Si is 0.10-0.20wt%, Mn is 20-28wt%, Ni is 0.01-0.08wt%, P is ⁇ 0.005wt%, S is ⁇ 0.003wt%.
  • the groove type of the test plate of the ultra-low temperature high manganese steel is X type, and the groove angle on one side is 30°.
  • the welding wire uses carbon dioxide shielding gas with a purity greater than 99.5%, welding with a heat input of 10-25KJ/cm and a dry elongation of the welding wire of 12-18mm.
  • the experimental results of this example show that: the CO2 gas shielded welding welding wire suitable for ultra-low temperature high manganese steel prepared by using the iron and steel raw materials of this example, after CO2 gas shielded welding, the mechanical properties of the weld deposit metal fully meet the requirements of the ultralow temperature high manganese steel The technical requirements of the welded joints meet the technical requirements of the ultra-low temperature high manganese steel structure.
  • a CO2 gas shielded welding wire for ultra-low temperature high manganese steel the chemical composition of raw materials is: C is 0.35wt%, Mn is 24.3wt%, Ni is 5.5wt%, Cr is 4.0wt%, Si is 0.70wt% , P ⁇ 0.010wt%, S ⁇ 0.006wt%, and the balance is Fe and unavoidable impurities.
  • the above raw materials are hot-rolled into a ⁇ 5.5mm wire rod, and then drawn to a ⁇ 1.2mm specification through multiple annealing, and the surface is plated with 0.19-0.23 micron copper to prepare a welding wire.
  • the CO2 gas shielded welding method is used to weld 16mm thick ultra-low temperature high manganese steel.
  • the chemical composition of the ultra-low temperature high manganese steel is: C is 0.40-0.50wt%, Si is 0.10-0.20wt%, Mn is 20-28wt%, Ni is 0.01-0.08wt%, P is ⁇ 0.005wt%, S is ⁇ 0.003wt%.
  • the groove type of the test plate of the ultra-low temperature high manganese steel is X type, and the groove angle on one side is 30°.
  • the welding wire uses carbon dioxide shielding gas with a purity greater than 99.5%, welding with a heat input of 10-25KJ/cm and a dry elongation of the welding wire of 12-18mm.
  • a CO2 gas shielded welding wire for ultra-low temperature high manganese steel the chemical composition of raw materials is: C is 0.18wt%, Mn is 24.5wt%, Ni is 5.2wt%, Cr is 3.8wt%, Si is 0.78wt% , P ⁇ 0.010wt%, S ⁇ 0.006wt%, and the balance is Fe and unavoidable impurities.
  • the above raw materials are hot-rolled into a ⁇ 5.5mm wire rod, and then drawn to a ⁇ 1.2mm specification through multiple annealing, and the surface is plated with 0.19-0.23 micron copper to prepare a welding wire.
  • the CO2 gas shielded welding method is used to weld 16mm thick ultra-low temperature high manganese steel.
  • the chemical composition of the ultra-low temperature high manganese steel is: C is 0.40-0.50wt%, Si is 0.10-0.20wt%, Mn is 20-28wt%, Ni is 0.01-0.08wt%, P is ⁇ 0.005wt%, S is ⁇ 0.003wt%.
  • the groove type of the test plate of the ultra-low temperature high manganese steel is X type, and the groove angle on one side is 30°.
  • the welding wire uses carbon dioxide shielding gas with a purity greater than 99.5%, welding with a heat input of 10-25KJ/cm and a dry elongation of the welding wire of 12-18mm.
  • the above examples show that the content of alloy elements used in the present invention is low in price, the alloy composition system is simple, and the preparation cost is low.
  • the content of the main alloying element Mn used in the present invention is 23 to 25 wt%, and the formed weld metal is equivalent to the manganese content of the ultra-low temperature high manganese steel, which ensures that the composition system is basically the same as that of the base metal, and avoids the Changes in microstructure and properties near the fusion line formed by the diffusion of manganese.
  • the manganese element, carbon element and nickel element are both austenite-forming elements, and when the weld metal molten pool is solidified, the austenite phase is used as the initial phase of solidification, and it is kept until room temperature to form austenite Body tissue weld metal.
  • the weld metal has the mechanical properties that match the base metal.
  • the invention adds 0.60-0.90wt% silicon element, which effectively improves the fluidity of molten steel in the molten pool during welding, and the welding wire has excellent manufacturability.
  • the present invention strictly controls the content of sulfur and phosphorus elements: P ⁇ 0.010wt%, S ⁇ 0.006wt%.
  • the chemical composition system adopted in the present invention makes the weld metal structure fully austenite, which not only ensures the excellent ultra-low temperature toughness and sufficient strength of the weld metal, but also reduces the solidification temperature range and avoids the appearance of solidification cracks. Reduce or prevent liquefaction cracks and reheat cracks.
  • the CO2 gas shielded welding wire prepared by the invention is used for welding ultra-low temperature high manganese steel, and the weld metal forms a full austenite structure, which not only ensures excellent ultra-low temperature toughness, but also has an impact energy Akv of 69-93J at -196°C. ; It also ensures sufficient strength: the yield strength is 476-507MPa, the tensile strength is 669-723MPa, and the elongation A is 36-40%.
  • the welding wire and its wire rod for CO2 gas shielded welding of the present invention have low cost, simple alloy composition system; excellent welding manufacturability; the formed weld metal has the characteristics of ultra-low temperature and high toughness, and its strength matches the ultra-low temperature high manganese steel.
  • the welded joint has the mechanical properties of high strength and excellent ultra-low temperature toughness, which can meet the technical requirements of ultra-low temperature high manganese steel for the strength and ultra-low temperature toughness of welds and welded joints.

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  • Mechanical Engineering (AREA)
  • Arc Welding In General (AREA)

Abstract

本发明公开了一种超低温高锰钢的CO 2气体保护焊焊丝及制备方法，其原料以重量份数计包括：C为0.15～0.35wt％，Mn为23～25wt％，Si为0.60～0.90wt％，Ni为4.0～6.0wt％，Cr为3.0～4.5wt％，P≤0.010wt％，S≤0.006wt％，余量为Fe和不可避免的杂质。将原料经热轧成盘条，再经多道退火拉拔至直条，并在表面镀铜，制备成焊丝。本发明制备的焊丝具有成本低、合金成分体系简单，所形成的焊缝金属低温韧性优良，强度与超低温高锰钢相匹配，满足对所焊接的适用于超低温高锰钢的强度和超低温韧性的技术要求。

Description

超低温高锰钢的CO 2气体保护焊焊丝及制备方法 技术领域
本发明属于高锰钢的CO 2气体保护焊焊丝技术领域，具体涉及一种超低温高锰钢的CO 2气体保护焊焊丝及制备方法。
背景技术
随着海洋战略和新能源战略的实施，在未来几十年里，用于液化天然气(LNG)等低温或超低温贮存运输容器的钢铁材料，其需求将会出现逐渐上升的趋势。现阶段，用于LNG贮罐的钢为商业用9Ni钢，由于镍含量高达9％，钢板价格昂贵。为节省Ni资源、降低钢铁材料的成本以及能源贮存和运输成本，科研人员正在积极研制超低温高锰钢。
超低温高锰钢在应用过程中，采用焊接工艺制备结构及设备时，手工焊条电弧焊接、CO 2气体保护焊接和埋弧焊接都是常用的焊接方法，而目前除手动电弧焊接外，还没有用于制备高锰低温钢相配套的CO 2气体保护焊和埋弧焊接材料。
工程实践中，目前超低温贮存运输容器普遍采用9Ni钢制备，与之相配套的焊材都是镍基焊丝，存在两个问题：第一，焊丝中镍元素含量为50～60％，价格昂贵；第二，母材与焊丝的成分属于不同成分体系，合金含量差别较大，会引起焊接接头熔合线处元素扩散，组织与性能发生变化。
发明内容
发明目的：本发明的目的是提供一种超低温高锰钢的CO 2气体保护焊焊丝，解决没有适用于制备高锰低温钢相配套的CO 2气体保护焊的焊丝，现有镍基焊丝容易引起焊接接头熔合线处元素扩散进而影响组织与性能的问题。
技术方案：本发明所述的超低温高锰钢的CO 2气体保护焊焊丝，其原料以重量份数计包括：C为0.15～0.35wt％，Mn为23～25wt％，Si为0.60～0.90wt％，Ni为4.0～6.0wt％，Cr为3.0～4.5wt％，P≤0.010wt％，S≤0.006wt％，余量为Fe和不可避免的杂质。
本发明所述的超低温高锰钢的CO 2气体保护焊焊丝的制备方法，将原料经热轧成盘条，再经多道退火拉拔至直条，并在表面镀铜，制备成焊丝。
其中，所述盘条的规格为Φ5.5mm，直条的规格为Φ1.2mm。所述镀铜镀层厚度为0.19-0.23微米。
有益效果：与现有技术相比其显著优点在于，本发明采用的合金元素价格低、合金成分体系简单，制备成本低。形成的焊缝金属与超低温高锰钢的锰含量相当，保证了与母材基本相同的成分体系，在形成焊接接头时，避免了锰元素扩散所形成的熔合线附近微观组织与力学性能的变化。本发明中的锰元素与碳元素、镍元素同为奥氏体形成元素，共同作用在焊缝金属熔池凝固时，以奥氏体相为凝固初始相，且一直保持到室温，形成奥氏体组织的焊缝金属，不仅保证了焊缝金属有优良的超低温韧性，-196℃时冲击功Akv为69～93J，亦保证了足够的强度：屈服强度为476～507MPa，抗拉强度为669～723MPa，延伸率A为36～40％，实现了超低温高锰钢的力学性能要求和超低温韧性的要求，而且降低了凝固温度范围，避免凝固裂纹的出现，同时减少或防止液化裂纹及再热裂纹的产生，使焊缝金属具有了与母材相匹配的力学性能。
本发明添加4.0～6.0wt％的镍元素，在减小凝固温度区间，减少和避免了凝固裂纹的同时，有效提高焊缝熔敷金属的低温冲击性能。本发明添加0.60-0.90wt％的硅元素，有效提高了焊接时熔池的钢水流动性，焊丝工艺性优良。
因此，本发明制备成本低、合金成分体系简单；焊接工艺性优良；所形成的焊缝金属具有超低温高韧性的特点，强度与超低温高锰钢相匹配，焊接接头具有强度高和优良的超低温韧性的力学性能，能满足对所焊接的适用于超低温高锰钢的强度和超低温韧性的技术要求。
具体实施方式
下面结合实施例对本发明的技术方案作进一步说明。
实施例1
一种超低温高锰钢的CO 2气体保护焊焊丝，原料的化学组分是：C为0.25wt％，Mn为23.5wt％，Si为0.75wt％，Ni为5.0wt％，Cr为3.5wt％，P≤0.010wt％，S≤0.006wt％，余量为Fe和不可避免的杂质。
采用以上原材料经热轧成Φ5.5mm规格盘条，再经多道退火拉拔至Φ1.2mm规格，并在表面镀0.19-0.23微米的铜，制备成焊丝。
采用CO 2气体保护焊接方法，焊接16mm厚的超低温高锰钢。所述超低温高锰钢的化学组分是：C为0.40～0.50wt％，Si为0.10～0.20wt％，Mn为20～28wt％，Ni为 0.01～0.08wt％，P为≤0.005wt％，S为≤0.003wt％。所述25Mn超低温钢的力学性能是：抗拉强度为≥400MPa，屈服强度为≥560MPa，延伸率A＝40％；-196℃时冲击功Akv≥54J。所述超低温高锰钢的试板坡口型式为X型，单侧坡口角度为30°。焊接时，焊丝采用纯度大于99.5％的二氧化碳保护气体，以10～25KJ/cm的热输入、12～18mm的焊丝干伸长度施焊。
对本实施例焊后的焊缝金属显微组织及力学性能进行检测分析：焊缝金属为全奥氏体组织；没有凝固裂纹及再热裂纹产生；焊缝金属的屈服强度为476～493MPa，抗拉强度为669～701MPa，伸长率A＝38～40％，-196℃时冲击功平均值Akv＝77～93J。
本实施例实验结果表明：采用本实施例钢铁原材料制备的适用于超低温高锰钢的CO2气体保护焊接用焊丝，经CO2气体保护焊接后，焊缝熔敷金属的力学性能完全满足超低温高锰钢的技术要求，焊接接头满足超低温高锰钢制备结构的技术要求。
实施例2
一种超低温高锰钢的CO 2气体保护焊焊丝，原料的化学组分是：C为0.35wt％，Mn为24.3wt％，Ni为5.5wt％，Cr为4.0wt％，Si为0.70wt％，P≤0.010wt％，S≤0.006wt％，余量为Fe和不可避免的杂质。
采用以上原材料经热轧成Φ5.5mm规格盘条，再经多道退火拉拔至Φ1.2mm规格，并在表面镀0.19-0.23微米的铜，制备成焊丝。
采用CO 2气体保护焊接方法，焊接16mm厚的超低温高锰钢。所述超低温高锰钢的化学组分是：C为0.40～0.50wt％，Si为0.10～0.20wt％，Mn为20～28wt％，Ni为0.01～0.08wt％，P为≤0.005wt％，S为≤0.003wt％。所述25Mn超低温钢的力学性能是：抗拉强度为≥400MPa，屈服强度为≥560MPa，延伸率A＝40％；-196℃时冲击功Akv≥54J。所述超低温高锰钢的试板坡口型式为X型，单侧坡口角度为30°。焊接时，焊丝采用纯度大于99.5％的二氧化碳保护气体，以10～25KJ/cm的热输入、12～18mm的焊丝干伸长度施焊。
对本实施例焊后的焊缝金属显微组织及力学性能进行检测分析：焊缝金属为全奥氏体组织；没有凝固裂纹及再热裂纹产生；焊缝金属的屈服强度为485～507MPa，抗拉强 度为682～723MPa，伸长率A＝36～39％，-196℃时冲击功平均值Akv＝69～89J。
实施例3
一种超低温高锰钢的CO 2气体保护焊焊丝，原料的化学组分是：C为0.18wt％，Mn为24.5wt％，Ni为5.2wt％，Cr为3.8wt％，Si为0.78wt％，P≤0.010wt％，S≤0.006wt％，余量为Fe和不可避免的杂质。
采用以上原材料经热轧成Φ5.5mm规格盘条，再经多道退火拉拔至Φ1.2mm规格，并在表面镀0.19-0.23微米的铜，制备成焊丝。
采用CO 2气体保护焊接方法，焊接16mm厚的超低温高锰钢。所述超低温高锰钢的化学组分是：C为0.40～0.50wt％，Si为0.10～0.20wt％，Mn为20～28wt％，Ni为0.01～0.08wt％，P为≤0.005wt％，S为≤0.003wt％。所述25Mn超低温钢的力学性能是：抗拉强度为≥400MPa，屈服强度为≥560MPa，延伸率A＝40％；-196℃时冲击功Akv≥54J。所述超低温高锰钢的试板坡口型式为X型，单侧坡口角度为30°。焊接时，焊丝采用纯度大于99.5％的二氧化碳保护气体，以10～25KJ/cm的热输入、12～18mm的焊丝干伸长度施焊。
对本实施例焊后的焊缝金属显微组织及力学性能进行检测分析：焊缝金属为全奥氏体组织；没有凝固裂纹及再热裂纹产生；焊缝金属的屈服强度为479～503MPa，抗拉强度为672～718MPa，伸长率A＝37～40％，-196℃时冲击功平均值Akv＝70～91J。
以上实施例表明：本发明采用的合金元素含量价格低和合金成分体系简单，制备成本低。本发明采用的主要合金元素Mn的含量为23～25wt％，形成的焊缝金属与超低温高锰钢的锰含量相当，保证了与母材基本相同的成分体系，在形成焊接接头时，避免了锰元素扩散所形成的熔合线附近组织与性能的变化。本发明中的锰元素与碳元素、镍元素同为奥氏体形成元素，共同作用在焊缝金属熔池凝固时，以奥氏体相为凝固初始相，且一直保持到室温，形成奥氏体组织的焊缝金属。使焊缝金属具有了与母材相匹配的力学性能。本发明添加0.60-0.90wt％的硅元素，有效提高了焊接时熔池的钢水流动性，焊丝工艺性优良。此外，杂质元素硫与磷的存在，使焊缝金属产生液化裂纹与再热裂纹，故本发明严格控制硫、磷元素的含量：P≤0.010wt％，S≤0.006wt％。本发明采用的化学成分体系，使焊缝金属组织为全奥氏体，不仅保证了焊缝金属有优良的超低温韧性和有 足够的强度，且降低了凝固温度范围，避免凝固裂纹的出现，同时减少或防止液化裂纹及再热裂纹的产生。本发明所制备的CO2气体保护焊接用焊丝，用于超低温高锰钢的焊接，焊缝金属形成全奥氏体组织，不仅保证了优良的超低温韧性，-196℃时冲击功Akv为69～93J；亦保证了足够的强度：屈服强度为476～507MPa，抗拉强度为669～723MPa，延伸率A为36～40％，实现了超低温高锰钢的力学性能要求和超低温韧性的要求。
因此，本发明CO2气体保护焊接用焊丝及其盘条具有成本低、合金成分体系简单；焊接工艺性优良；所形成的焊缝金属具有超低温高韧性的特点，强度与超低温高锰钢相匹配，焊接接头具有强度高和优良的超低温韧性的力学性能，能满足超低温高锰钢对焊缝和焊接接头的强度和超低温韧性的技术要求。

Claims (5)

  1. 超低温高锰钢的CO 2气体保护焊焊丝，其特征在于，其原料以重量份数计包括：C为0.15～0.35wt％，Mn为23～25wt％，Si为0.60～0.90wt％，Ni为4.0～6.0wt％，Cr为3.0～4.5wt％，P≤0.010wt％，S≤0.006wt％，余量为Fe和不可避免的杂质。
  2. 如权利要求1所述的超低温高锰钢的CO 2气体保护焊焊丝的制备方法，其特征在于，将原料经热轧成盘条，再经多道退火拉拔至直条，并在表面镀铜，制备成焊丝。
  3. 根据权利要求2所述的超低温高锰钢的CO 2气体保护焊焊丝的制备方法，其特征在于，所述盘条的规格为Φ5.5mm。
  4. 根据权利要求2所述的超低温高锰钢的CO 2气体保护焊焊丝的制备方法，其特征在于，所述直条的规格为Φ1.2mm。
  5. 根据权利要求2所述的超低温高锰钢的CO 2气体保护焊焊丝的制备方法，其特征在于，所述镀铜镀层厚度为0.19-0.23微米。
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