Gas metal arc welding weld wire suitable for working temperature being -196 DEG C

A technology of melting electrode gas and working temperature, applied in welding media, manufacturing tools, welding equipment, etc., can solve the problems of changes in structure and performance, high price, element diffusion, etc., to achieve low price, low preparation cost, alloy composition system simple effect

Active Publication Date: 2017-07-11
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ultra-low temperature high manganese steel MIG welding wire adopts the same welding wire as 9Ni steel, and nickel-based welding wire is most widely used in 9Ni steel engineering. When nickel-based welding wire is used, there are two problems: first, the content of nickel in the welding wir...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A metal gas shielded welding wire suitable for -196°C working temperature (hereinafter referred to as metal gas shielded welding wire). The chemical composition of the metal gas shielded welding wire is: C is 0.30~0.38wt%, Mn is 25.3~26.0wt%, Ni is 6.4~7.0wt%, W is 2.5~3.0wt%, P≤0.002wt %, S≤0.001wt%, the balance is Fe and unavoidable impurities.

[0017] The metal gas metal shielded welding wire has a diameter of Φ1.2 mm, and the metal gas metal shielded welding welding method is used to weld 25Mn ultra-low temperature steel with a thickness of 16 mm.

[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 ≥ 560MPa, elongation A=40%; impact energy A at -196°C kv ≥54J.

[0019] The groove type of the test plate of the 25Mn ultra...

Embodiment 2

[0025] A metal gas shielded welding wire suitable for -196°C working temperature. Except following, all the other are with embodiment 1:

[0026] The chemical composition of the metal gas shielded welding wire is: C is 0.38~0.45wt%, Mn is 24.7~25.3wt%, Ni is 7.0~7.6wt%, W is 3.0~3.5wt%, P≤0.002wt %, S≤0.001wt%, the balance is Fe and unavoidable impurities.

[0027] The diameter of the metal gas shielded welding wire is Φ1.2mm.

[0028] 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; there are no solidification cracks and reheat cracks; the yield strength of the weld metal is 456~478MPa, The tensile strength is 663~695MPa, the elongation A=38~39%, and the average value of impact energy at -196°C is A kv =74~82J.

Embodiment 3

[0030] A metal gas shielded welding wire suitable for -196°C working temperature. Except following, all the other are with embodiment 1:

[0031] The chemical composition of the metal gas shielded welding wire is: C is 0.45~0.55wt%, Mn is 24.0~24.7wt%, Ni is 7.6~8.2wt%, W is 3.5~4.0wt%, P≤0.002wt %, S≤0.001wt%, the balance is Fe and unavoidable impurities.

[0032] The diameter of the metal gas shielded welding wire described in this embodiment is Φ1.2mm.

[0033] The microstructure and mechanical properties of the weld metal after welding in this example were tested and analyzed: the weld metal is a fully austenitic structure; there are no solidification cracks and reheat cracks; the yield strength of the weld metal is 410~425MPa, The tensile strength is 582~625MPa, the elongation A=41~42%, and the average value of impact energy at -196°C is A kv =95~106J.

[0034] Compared with the prior art, this specific embodiment has the following positive effects:

[0035] The co...

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Abstract

The invention relates to a gas metal arc welding weld wire suitable for the working temperature being -196 DEG C. According to the technical field, the gas metal arc welding weld wire is prepared from, by weight, 0.30%-0.55% of C, 24%-26% of Mn, 6.4%-8.2% of Ni, 2.5%-4.0% of W, not larger than 0.002% of P, not larger than 0.001% of S and the balance Fe and inevitable impurities. The gas metal arc welding weld wire is low in preparation cost and simple in alloy composition system; formed weld metal has the characteristic of ultralow temperature high toughness, and the strength is matched with that of ultralow-temperature high manganese steel; and a welding joint has the mechanical properties of high strength and excellent ultralow temperature toughness, and the technical requirements for the strength and ultralow temperature toughness of equipment welded when the working temperature is -196 DEG C can be met.

Description

technical field [0001] The invention belongs to the technical field of MIG shielded welding wire. In particular, it relates to a melting electrode gas shielded welding wire suitable for the working temperature of -196°C. Background technique [0002] Containers suitable for working at -196°C mainly refer to storage and transportation containers such as liquefied natural gas (LNG). At present, the steel used for LNG storage tanks is 9Ni steel for commercial use. Because the nickel content is as high as 9%, the 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 ultra-low temperature high manganese steel. [0003] In our country, some universities and iron and steel enterprises have taken the lead in carrying out some theoretical and experimental research jointly, and developed ultra-low temperature high manganese steel suitable for...

Claims

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Application Information

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IPC IPC(8): B23K35/30
CPCB23K35/3073
Inventor 王红鸿罗强覃展鹏童志万响亮吴开明
Owner WUHAN UNIV OF SCI & TECH
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