9Ni steel sintered flux and preparation method thereof

Abstract

The invention belongs to the field of welding material production, and discloses a 9Ni steel sintered flux and a preparation method thereof. The sintered flux comprises the following components in percentage by weight: 20 to 30 percent of dead-burned magnesite clinker, 8 to 18 percent of fluorite, 20 to 30 percent of corundum, 1 to 3 percent of elpasolite, 10 to 20 percent of grammite, 2 to 8 percent of strontium carbonate, 1 to 5 percent of rutile, 1 to 3 percent of silicon iron, 1 to 3 percent of ferrotitanium, 1 to 5 percent of manganese metal, 1 to 5 percent of magnesium fluoride and 1 to 3 percent of chromium oxide green. The preparation method comprises the following steps of: performing dry-mixing on mineral materials and iron alloy in a formula for 5 minutes; adding water glass to perform wet-mixing; then pelleting the mixture; drying pellets for 3 hours under the atmospheric environment; baking the pellets in a baking oven at a low temperature of 150 DEG C for 2 hours; then baking the pellets at a high temperature of 800 DEG C for 1 hour; performing furnace cooking, and crushing and screening the pellets to obtain a 12-60-mesh finished product of the flux. When the flux disclosed by the invention is matched with an ERNiMo-8 welding wire to perform welding, the flux has the following characteristics that: 1) a welding seam process has high performance, electric arcs during welding are stable, the surface of a welding seam is white and bright without an oxide color, molten slag is turned up automatically and can be taken off with a slight contact, the welded seam is formed to have a beautiful appearance, the welding bead height is moderate, and the welded same infiltration angle is moderate; 2) the flux can be matched with the ERNiMo-8 welding wire in use, and the comprehensive mechanical property is high; and 3) the flux can be matched with the ERNiMo-8 in use, and the chemical components of a deposited metal are easy to control.

Description

technical field [0001] The invention belongs to the field of welding material production, mainly relates to a sintering flux for 9Ni steel and a manufacturing method thereof, and is especially suitable for submerged arc welding of 9Ni steel. Background technique [0002] Natural gas is an important part of energy consumption in the world today, and it is called the three pillars of world energy together with coal and oil. Natural gas is a clean energy source. At present, all countries in the world have begun to pay attention to the development and utilization of natural gas in order to change the energy structure and improve the environment. Based on a responsible attitude towards the global environment and abundant natural gas resources, China has also increased the utilization of natural gas, and has started the construction of liquefied natural gas (LNG) terminals in Henan, Xinjiang, Guangdong and Fujian. It also built a large number of LNG carriers and ships. Due to t...

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Problems solved by technology

Some domestic manufacturers produce corresponding flux, but the welding effect is poor

And at present, there is no relevant patent on sintering flux for submerged arc welding of 9Ni steel in China

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