Tungsten argon arc welding solid wire for ultra-low temperature high manganese steel welding

Abstract

The invention relates to a tungsten electrode argon arc welding solid cored welding wire used for welding ultralow-temperature high manganese steel. According to the technical scheme of the solid cored welding wire, the tungsten electrode argon arc welding solid cored welding wire used for welding the ultralow-temperature high manganese steel comprises the chemical components of 0.25-0.55 wt% of C, 23-26 wt% of Mn, 8-10 wt% of Ni, 3-5 wt% of W, less than or equal to 0.002 wt% of P, less than or equal to 0.001 wt% of S and the balance Fe and inevitable impurities. The solid cored welding wire is low in price of alloy element content and simple in alloy component system; and formed weld metal has good low-temperature toughness, and the strength of the weld metal is matched with the ultralow-temperature high manganese steel, and the technical requirements for the strength and ultralow-temperature toughness of LNG devices and other devices prepared through welding.

Description

technical field

[0001] The invention belongs to the technical field of tungsten argon arc welding solid wire. Specifically relates to a tungsten argon arc welding solid core wire used for ultra-low temperature high manganese steel welding. Background technique

[0002] Low-temperature steel refers to steel materials used for storage and transportation containers such as liquefied petroleum gas (LPG) and liquefied natural gas (LNG), as well as offshore oil engineering structures. -100~-110℃ and -162~-196℃ four grades. At this stage, the steel used for LNG tanks with a working temperature of -196°C is called ultra-low temperature steel. The steel used for LNG tanks is mainly 9Ni steel, and because the nickel content is as high as 9%, the 9Ni steel plate is expensive. In order to save Ni resources, reduce the cost of steel materials and energy storage and transportation costs, researchers from all over the world are actively developing and trial-producing high-manganese low-...

Examples

Embodiment 1

[0016] A solid wire for argon tungsten arc welding (hereinafter referred to as argon tungsten arc welding solid wire) for ultra-low temperature high manganese steel welding. The chemical composition of the argon tungsten arc welding solid wire is: C is 0.25~0.35wt%, Mn is 23~24wt%, Ni is 9.4~10wt%, W is 3.0~3.8wt%, P≤0.002wt %, S≤0.001wt%, the balance is Fe and unavoidable impurities.

[0017] The argon tungsten arc welding solid wire for ultra-low temperature high manganese steel welding prepared in this example has a diameter of Φ2.4mm, and adopts the argon tungsten arc welding method; the ultra-low temperature high manganese steel is 12mm thick 25Mn ultra-low temperature steel.

[0018] The chemical composition of the 25Mn ultra-low temperature steel is: C is 0.40~0.50wt%, Si is 0.10~0.20wt%, Mn is 20~28wt%, N is 0.01~0.08wt%, P is ≤0.005wt%, S is ≤0.003wt%. The mechanical properties of the 25Mn ultra-low temperature steel are: tensile strength ≥ 400MPa, yield strength ≥...

Embodiment 2

[0025] A tungsten argon arc welding solid wire for ultra-low temperature high manganese steel welding. Except following, all the other are with embodiment 1:

[0026] The chemical composition of the argon tungsten arc welding solid wire is: C is 0.35~0.45wt%, Mn is 25~26wt%, Ni is 8.8~9.4wt%, W is 3.8~4.4wt%, P≤0.002 wt%, S≤0.001wt%, the balance is Fe and unavoidable impurities.

[0027] The diameter of the solid welding wire prepared in this embodiment is Φ2.4mm. Detect and analyze the microstructure and mechanical properties of the weld metal after welding in this example: the weld metal is a fully austenitic structure without solidification cracks and reheat cracks; the yield strength of the weld metal is 466~485MPa, and the resistance The tensile strength is 658~680MPa, the elongation A=41~43%, and the average value of impact energy at -196°C is A kv =62~78J.

Embodiment 3

[0029] A tungsten argon arc welding solid wire for ultra-low temperature high manganese steel welding. Except following, all the other are with embodiment 1:

[0030] The chemical composition of the argon tungsten arc welding solid wire is: C is 0.45~0.55wt%, Mn is 24~25wt%, Ni is 8.0~8.8wt%, W is 4.4~5.0wt%, P≤0.002 wt%, S≤0.001wt%, the balance is Fe and unavoidable impurities.

[0031] The diameter of the solid welding wire prepared in this embodiment is Φ2.4mm.

[0032] Detect and analyze the microstructure and mechanical properties of the weld metal after welding in this example: the weld metal is a fully austenitic structure without solidification cracks and reheat cracks; the yield strength of the weld metal is 435~466MPa, and the resistance The tensile strength is 625~658MPa, the elongation A=43~44%, and the average value of impact energy at -196°C is A kv =78~94J.

[0033] Compared with the prior art, this specific embodiment has the following positive effects:

...

technical field

[0001] The invention belongs to the technical field of tungsten argon arc welding solid wire. Specifically relates to a tungsten argon arc welding solid core wire used for ultra-low temperature high manganese steel welding. Background technique

[0002] Low-temperature steel refers to steel materials used for storage and transportation containers such as liquefied petroleum gas (LPG) and liquefied natural gas (LNG), as well as offshore oil engineering structures. -100~-110℃ and -162~-196℃ four grades. At this stage, the steel used for LNG tanks with a working temperature of -196°C is called ultra-low temperature steel. The steel used for LNG tanks is mainly 9Ni steel, and because the nickel content is as high as 9%, the 9Ni steel plate is expensive. In order to save Ni resources, reduce the cost of steel materials and energy storage and transportation costs, researchers from all over the world are actively developing and trial-producing high-manganese low-...

Examples

Embodiment 1

[0016] A solid wire for argon tungsten arc welding (hereinafter referred to as argon tungsten arc welding solid wire) for ultra-low temperature high manganese steel welding. The chemical composition of the argon tungsten arc welding solid wire is: C is 0.25~0.35wt%, Mn is 23~24wt%, Ni is 9.4~10wt%, W is 3.0~3.8wt%, P≤0.002wt %, S≤0.001wt%, the balance is Fe and unavoidable impurities.

[0017] The argon tungsten arc welding solid wire for ultra-low temperature high manganese steel welding prepared in this example has a diameter of Φ2.4mm, and adopts the argon tungsten arc welding method; the ultra-low temperature high manganese steel is 12mm thick 25Mn ultra-low temperature steel.

[0018] The chemical composition of the 25Mn ultra-low temperature steel is: C is 0.40~0.50wt%, Si is 0.10~0.20wt%, Mn is 20~28wt%, N is 0.01~0.08wt%, P is ≤0.005wt%, S is ≤0.003wt%. The mechanical properties of the 25Mn ultra-low temperature steel are: tensile strength ≥ 400MPa, yield strength ≥...

Embodiment 2

[0025] A tungsten argon arc welding solid wire for ultra-low temperature high manganese steel welding. Except following, all the other are with embodiment 1:

[0026] The chemical composition of the argon tungsten arc welding solid wire is: C is 0.35~0.45wt%, Mn is 25~26wt%, Ni is 8.8~9.4wt%, W is 3.8~4.4wt%, P≤0.002 wt%, S≤0.001wt%, the balance is Fe and unavoidable impurities.

[0027] The diameter of the solid welding wire prepared in this embodiment is Φ2.4mm. Detect and analyze the microstructure and mechanical properties of the weld metal after welding in this example: the weld metal is a fully austenitic structure without solidification cracks and reheat cracks; the yield strength of the weld metal is 466~485MPa, and the resistance The tensile strength is 658~680MPa, the elongation A=41~43%, and the average value of impact energy at -196°C is A kv =62~78J.

Embodiment 3

[0029] A tungsten argon arc welding solid wire for ultra-low temperature high manganese steel welding. Except following, all the other are with embodiment 1:

[0030] The chemical composition of the argon tungsten arc welding solid wire is: C is 0.45~0.55wt%, Mn is 24~25wt%, Ni is 8.0~8.8wt%, W is 4.4~5.0wt%, P≤0.002 wt%, S≤0.001wt%, the balance is Fe and unavoidable impurities.

[0031] The diameter of the solid welding wire prepared in this embodiment is Φ2.4mm.

[0032] Detect and analyze the microstructure and mechanical properties of the weld metal after welding in this example: the weld metal is a fully austenitic structure without solidification cracks and reheat cracks; the yield strength of the weld metal is 435~466MPa, and the resistance The tensile strength is 625~658MPa, the elongation A=43~44%, and the average value of impact energy at -196°C is A kv =78~94J.

[0033] Compared with the prior art, this specific embodiment has the following positive effects:

...