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Fully automatic submerged arc welding solid wire for high manganese steel for lng storage tank

A technology of solid welding wire and high manganese steel, applied in arc welding equipment, welding equipment, manufacturing tools, etc., can solve problems such as changes in structure and performance, high price, element diffusion, etc., to reduce solidification cracks, improve strength, and excellent The effect of ultra-low temperature toughness

Active Publication Date: 2019-03-19
WUHAN UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nickel-based welding wire is the most widely used in 9Ni steel engineering. When nickel-based welding wire is used, there are two problems: one is that the content of nickel in the welding wire is 50-60%, which is expensive; the other is that the base metal and welding wire contain different components. Mn and Ni content, the concentration gradient will cause element diffusion at the fusion line of the welded joint, and the microstructure and properties will change

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A fully automatic submerged arc welding solid wire for preparing high manganese steel for LNG storage tanks (hereinafter referred to as fully automatic submerged arc welding solid wire). The chemical composition of the fully automatic submerged arc welding solid wire is: C is 0.20~0.30wt%, Mn is 23~24wt%, Ni is 7.2~8.0wt%, W is 3.0~3.8wt%, N is 0.02 ~0.03 wt%, P≤0.002wt%, S≤0.001wt%, the balance is Fe and unavoidable impurities.

[0017] The diameter of the fully automatic submerged arc welding wire is Φ2.4 mm, and the fully automatic submerged arc welding method is used to weld the LNG storage tank; the steel for the LNG storage tank is 25Mn ultra-low temperature steel with a thickness of 20 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 ≥ 4...

Embodiment 2

[0024] A fully automatic submerged arc welding solid core wire for preparing high manganese steel for LNG storage tanks. Except following, all the other are with embodiment 1:

[0025] The chemical composition of the fully automatic submerged arc welding solid wire is: C is 0.30~0.35wt%, Mn is 24~25wt%, Ni is 6.8~7.2wt%, W is 3.8~4.4wt%, N is 0.03 ~0.04wt%, P≤0.002wt%, S≤0.001wt%, the balance is Fe and unavoidable impurities.

[0026] The microstructure and mechanical properties of the weld metal after welding in this example were detected and analyzed: the weld metal is a fully austenitic structure; there is no solidification crack and reheat crack; the yield strength of the weld metal is 442-488MPa, and the The tensile strength is 652~662MPa, the elongation A=32~34%, and the average value of impact energy at -196°C is A kv =68~77J.

Embodiment 3

[0028] A fully automatic submerged arc welding solid core wire for preparing high manganese steel for LNG storage tanks. Except following, all the other are with embodiment 1:

[0029] The chemical composition of the fully automatic submerged arc welding solid wire is: C is 0.35~0.45wt%, Mn is 25~26wt%, Ni is 6.0~6.8wt%, W is 4.4~5.0wt%, N is 0.03 ~0.04wt%, P≤0.002wt%, S≤0.001wt%, the balance is Fe and unavoidable impurities.

[0030] 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; no solidification cracks and reheat cracks occur; the yield strength of the weld metal is 488~504MPa, The tensile strength is 662~715MPa, the elongation A=31~32%, and the average value of impact energy at -196°C is A kv =60~68J.

[0031] Compared with the prior art, this specific embodiment has the following positive effects:

[0032] The content of the main alloying element Mn used i...

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Abstract

The invention discloses a full-automatic submerged-arc welding solid-core welding wire for high-manganese steel for preparing an LNG storage tank. According to the technical scheme, the full-automatic submerged-arc welding solid-core welding wire comprises 0.25-0.45wt% of C, 23-26wt% of Mn, 6-8wt% of Ni, 3-5wt% of W, 0.02-0.04wt% of N, less than or equal to 0.02wt% of P, less than or equal to 0.001wt% of S and the balance of Fe and inevitable impurities. The full-automatic submerged-arc welding solid-core welding wire has the advantages that the price of adopted alloy elements is low, and an alloy component system is simple; and the low-temperature toughness of weld metal formed by the prepared full-automatic submerged-arc welding solid-core welding wire is excellent, the strength of the full-automatic submerged-arc welding solid-core welding wire is matched with the strength of the ultralow-temperature high-manganese steel for preparing the LNG storage tank, and the technical requirements for the strength and the ultralow-temperature toughness of the welded LNG storage tank can be met.

Description

technical field [0001] The invention belongs to the technical field of fully automatic submerged arc welding solid core wire. Specifically relates to a fully automatic submerged arc welding solid core wire for preparing high manganese steel for LNG storage tanks. Background technique [0002] With the vigorous development and application of liquefied petroleum gas (LPG) and liquefied natural gas (LNG), the demand for steel for storage and transportation containers of liquefied petroleum gas (LPG) and liquefied natural gas (LNG) will increase. At present, the low-temperature steel used for LNG storage tanks is 9Ni steel, the working temperature is -196°C, the nickel content is as high as 9%, and the steel plate is expensive. In order to save Ni resources, reduce the cost of steel materials, reduce energy storage and reduce transportation costs, researchers from all over the world are actively developing high-manganese low-temperature steel. [0003] my country's 13th Five-Y...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/30B23K9/18
CPCB23K9/18B23K35/0261B23K35/3073
Inventor 王红鸿李军辉李丽汪晶洁覃展鹏万响亮尹雨群吴开明
Owner WUHAN UNIV OF SCI & TECH
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