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Seamless flux-cored wire for high-manganese low-temperature steel of LNG storage tank and preparation method

A technology of seamless flux-cored welding wire and low-temperature steel, applied in welding equipment, welding medium, manufacturing tools, etc., can solve the problems of increased product cost, high Ni content, low processability, etc., and achieve improved bulk ratio and high impact Toughness, to prevent the effect of moisture absorption again

Active Publication Date: 2020-01-07
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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  • Seamless flux-cored wire for high-manganese low-temperature steel of LNG storage tank and preparation method
  • Seamless flux-cored wire for high-manganese low-temperature steel of LNG storage tank and preparation method
  • Seamless flux-cored wire for high-manganese low-temperature steel of LNG storage tank and 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 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 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 chemical composition (w...

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Abstract

The invention relates to a seamless flux-cored wire for high-manganese low-temperature steel of a LNG storage tank. The seamless flux-cored wire comprises low-carbon steel belt skin with mass percentage being 60-70% and a flux core with mass fraction being 30-40%; the flux core comprises the following components in percentage by mass: 65%-75% of electrolytic manganese metal, 8%-14% of nickel powder, less than 1.0% of silicon powder, less than 1.0% of sodium carbonate, 2%-8% of high-carbon ferrochrome and 4%-8% of sintering powder, and the balance iron powder; and the sintering powder comprises25%-30% of novel potassium titanate, 20%-25% of aluminum oxide, 10-15% of graphite, 25%-30% of magnesite and the balance bonding agent. The seamless flux-cored wire can be used for manufacturing theLNG storage tank, and has good impact toughness and base material matching strength at an ultra-low temperature, has good welding process property, can be suitable for multi-position welding, has chemical components matched with the base material, and is smoothly transited with the base material without 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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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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