Middle-manganese high-silicon low-fluorine smelting type welding flux

Abstract

The invention discloses a medium-manganese high-silica low-fluorine smelting soldering flux, which belongs to the field of welding in the mechanical industry. The medium-manganese high-silica low-fluorine smelting soldering flux comprises the following effective compositions in portion by weight: 21 to 26 portions of MnO, 36 to 40 portions of SiO2, 4 to 8 portions of CaF2, 15 to 21 portions of CaO, 3 to 5 portions of TiO2, 3 to 5 portions of MgO, less than or equal to 8 portions of Al2O3, and less than or equal to 1.8 portions of FeO. The medium-manganese high-silica low-fluorine smelting soldering flux has the characteristics that poor manganese ore (namely low-grade manganese ore) can be utilized for production, the cost is low, the application scope is wide, various quality and technical indexes of the medium-manganese high-silica low-fluorine smelting soldering flux can meet the pertinent regulations of F4A2-H08A in the GB / T 5293-1999, and so on and the medium-manganese high-silica low-fluorine smelting soldering flux can be widely applied to union melt welding, semiautomatic welding, electroslag pressure welding, copper welding, pressure welding of vertical reinforcements and so on. in the process of equipment manufacturing in the fields of machine manufacturing, the petrochemical industry, coal metallurgy, mines, buildings, electric power, the military industry, aerospace, marine engineering, and so on.

Description

Technical field [0001] The invention relates to the field of welding in the machinery industry, in particular to a medium-manganese, high-silicon, and low-fluorine smelting flux. Background technique [0002] In the equipment manufacturing process of machinery manufacturing, petrochemical industry, coal metallurgy, mining, construction, electric power, military industry, aerospace, ocean engineering and other fields, submerged arc automatic welding, semi-automatic welding, electroslag pressure welding and copper welding are widely used And pressure welding of vertical steel bars, etc., when performing the above welding, it is necessary to use various fluxes for protection. In the prior art, the typical flux is HJ431, which is a smelting high-manganese, high-silicon, and low-fluorine flux. It is a light yellow to reddish-brown glassy object, and its effective components are: MnO: 32-38, SiO 2 : 40-44, MgO: 5-8, CaF 2 : 3-7, CaO≤8, Al 2 o 3 ≤6, P≤0.08, S≤0.06, this kind o...

AI Technical Summary

Problems solved by technology

However, due to the large increase in domestic manganese ore consumption in recent years, the high-grade manganese ore resources have gradually decreased, and the continued production of high-manganese flux will encounter serious problems in terms of resources (the production of one ton of HJ431 requires a manganese content of 30% more than 1.2 tons of manganese ore); the second is that the cost is caused by the doubled increase in the price of manganese ore (currently, the price of manganese ore with a manganese content of 30% is more than 1,500 yuan, and every time the manganese content increases by one percentage point, the price of manganese ore increases by 100 yuan). substantial improvement

Chinese patent (patent No. 200410022890.2) discloses a "special flux for electroslag pressure welding of steel bars", the weight percentage of its composition is: MnO 20-24.5%, SiO2 35-40%, CaF2 5-10%, MgO 5 -9%, CaO 5-8%, Al2O3 9-13%, TiO2 3-4.9%, FeO<3.5%; this flux belongs to the medium manganese type flux, which has the advantages of easy arc starting during welding, stable arc and electroslag process, and good welding performance. Excellent mechanical properties of joints, etc., but this flux is mainly suitable for welding of class III steel bars, and its application range is narrow