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A kind of seamless flux-cored welding wire for LNG storage tank high manganese low temperature steel and its preparation method

A technology of seamless flux-cored welding wire and low-temperature steel, applied in welding equipment, manufacturing tools, welding media, etc., can solve the problems of increased product cost, low workability, and high Ni content, so as to improve the loose loading ratio and prevent repeated The effect of moisture absorption and high impact toughness

Active Publication Date: 2021-09-07
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the strength of these materials is generally low, and the processability is not high, so they are restricted in application.
In addition, the expensive Ni content in the product is high, and the product cost will be greatly increased

Method used

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  • A kind of seamless flux-cored welding wire for LNG storage tank high manganese low temperature steel and its preparation method
  • A kind of seamless flux-cored welding wire for LNG storage tank high manganese low temperature steel and its preparation method
  • A kind of seamless flux-cored welding wire for LNG storage tank high manganese low temperature steel and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A seamless flux-cored welding wire for high-manganese low-temperature steel for LNG storage tanks, which contains raw materials and their proportions as follows: electrolytic manganese metal 67%, nickel powder 12%, silicon powder 0.9%, soda ash 0.6%, high-carbon ferrochrome 7%, sintered powder 8% (of which the proportion of each component is new potassium titanate 28%, alumina 22%, graphite 15%, magnesia 27%, the rest is binder), and the rest is iron powder; from the above raw materials Mixed composition, filling rate 37%, wire diameter 1.2mm.

Embodiment 2

[0038] A seamless flux-cored welding wire for high-manganese low-temperature steel for LNG storage tanks, which contains raw materials and their proportions as follows: electrolytic manganese metal 72%, nickel powder 10%, silicon powder 0.7%, soda ash 0.5%, high-carbon ferrochrome 4%, 6% sintered powder (including 28% new potassium titanate, 22% alumina, 15% graphite, 27% magnesia, and the rest is binder), and the rest is iron powder; from the above raw materials Mixed composition, filling rate 35%, wire diameter 1.2mm.

Embodiment 3

[0040]A seamless flux-cored welding wire for high-manganese low-temperature steel for LNG storage tanks, which contains raw materials and their proportions as follows: electrolytic manganese metal 74%, nickel powder 13%, silicon powder 0.5%, soda ash 0.8%, high-carbon ferrochrome 5%, sintered powder 5% (of which the proportion of each component is 28% of new potassium titanate, 22% of alumina, 15% of graphite, 27% of magnesia, and the rest is binder), and the rest is iron powder; from the above raw materials Mixed composition, filling rate 32%, wire diameter 1.2mm.

[0041] The preparation method of the seamless flux-cored welding wire for the high manganese steel of the LNG storage tank of the present invention is as follows: the sheath is made of SPHC steel strip, and the composition and properties are shown in Tables 1 and 2. The chemical composition and mechanical properties of the welding wire deposited metal are shown in Table 3 and Table 4.

[0042] Table 1 The chemica...

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Abstract

The invention relates to a seamless flux-cored welding wire for high-manganese low-temperature steel of an LNG storage tank, which comprises a low-carbon steel strip sheath with a mass percentage of 60-70% and a flux core with a mass percentage of 30-40%. The core includes electrolytic manganese metal 65%-75%, nickel powder 8%-14%, silicon powder less than 1.0%, soda ash less than 1.0%, high-carbon ferrochrome 2%-8%, sintered powder 4%-8% , the rest is iron powder; the sintered powder includes 25%-30% of new potassium titanate, 20%-25% of alumina, 10%-15% of graphite, 25%-30% of magnesia, and the rest is binder . The welding wire can be used in the construction of LNG storage tanks, and has good impact toughness and strength matching the base metal at ultra-low temperatures; and the welding wire has good welding processability, and is suitable for welding in various positions. Matching chemical composition, smooth transition with base metal, no cracks.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and in particular relates to a seamless flux-cored welding wire. Background technique [0002] With the rapid development of the global economy and the emphasis on environmental protection in various countries, the demand for LNG (liquefied natural gas) is increasing day by day. my country is a big energy-consuming country, and LNG is mainly imported by sea, so there is a huge demand for LNG storage facilities. It is imminent to build LNG carriers and LNG receiving stations. [0003] LNG is usually stored and transported at minus 163°C. Previously, aluminum alloy, nickel alloy steel (9%Ni), and stainless steel were mainly used as the main materials for LNG storage tanks. However, the strength of these materials is generally low, and the processability is not high, so they are restricted in application. In addition, the expensive Ni content in the product is high, and the product cost...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/30B23K35/40
CPCB23K35/3073B23K35/40
Inventor 王亚彬亢天佑叶凡
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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