Excellent performance of melting type high manganese high silicon low fluorine flux in special environments
Publish Time: 2025-06-10
With the continuous advancement of modern industrial technology, the application scenarios of welding processes have become increasingly complex, especially in special environments such as high temperature, low temperature, humidity, and corrosive gases, and the requirements for welding materials have become more and more stringent. Among many welding materials, melting type high manganese high silicon low fluorine flux has shown excellent stability and adaptability in these extreme or harsh environments due to its unique chemical composition and physical properties, and has become an important choice in many high-end manufacturing fields.1. Chemical composition determines performance advantagesThe main components of melting type high manganese high silicon low fluorine flux are silicon dioxide (SiO₂) and manganese oxide (MnO), and contain a small amount of alkaline oxides and trace fluorides. Among them, the high content of silicon dioxide and manganese oxide gives the flux good deoxidation ability and alloy transition effect, which can effectively prevent the weld metal from oxidizing at high temperature and improve its strength and toughness. At the same time, due to the low fluorine content, this flux releases less harmful gases during the welding process, which not only improves the operating environment, but also reduces the occupational health risks of welders.2. Stability performance in high temperature environmentIn high temperature environments, such as boilers, heat exchangers, pipeline systems and other fields, welding joints must have good thermal strength and oxidation resistance. The slag system formed by melting type high manganese high silicon low fluorine flux during the smelting process has high viscosity and good covering performance, which can effectively isolate the air and prevent the weld metal from being oxidized at high temperatures. In addition, the flux can also promote the formation of stable austenite structure in the weld metal, enhance the creep resistance and structural stability of the weld under high temperature conditions.3. Crack resistance in low temperature environmentIn extremely cold areas or liquefied natural gas (LNG), cryogenic storage tanks and other applications, welding joints need to withstand the risk of cold brittleness caused by extremely low temperatures. Melting type high manganese high silicon low fluorine flux can provide good deoxidation and alloying effects during the welding process, so that the weld metal has excellent low-temperature toughness and crack propagation resistance. Experiments show that the joints welded with this type of flux can still maintain good impact toughness at -40℃ or even lower temperatures, and are suitable for the welding needs of low-temperature pressure vessels and steel structures.4. Corrosion resistance in humid and corrosive environmentsIn highly corrosive environments such as coastal areas, chemical plants, and offshore platforms, welded joints must not only withstand mechanical stress, but also have excellent corrosion resistance. Melting type high manganese high silicon low fluorine flux uses reasonable slag system design and alloy element ratio to give the weld metal a dense microstructure and a strong passivation film formation ability, thereby improving the weld's resistance to pitting, crevice corrosion, and stress corrosion cracking. This makes it perform well in shipbuilding, bridge engineering, and chemical equipment.5. Applicability in automated weldingIn recent years, with the development of intelligent manufacturing, automatic welding technology has accounted for an increasingly high proportion in industrial production. Melting type high manganese high silicon low fluorine flux has good arc stabilization performance and uniform slag coverage characteristics, and is particularly suitable for automated welding processes such as submerged arc welding (SAW). It can not only ensure the continuity and stability of the welding process, but also improve welding efficiency, reduce manual intervention, reduce scrap rate, and meet the high standards of large-scale industrial production.6. Dual guarantee of environmental protection and safetyCompared with traditional fluxes with high fluorine content, melting type high manganese high silicon low fluorine flux produces less smoke and dust during welding, and the emission of toxic gases such as hydrogen fluoride is significantly reduced, which greatly improves the welding working environment and meets the current standards of green manufacturing and occupational health and safety. In addition, the flux is easy to recycle and reduce secondary pollution to the environment, which is an ideal choice under the sustainable development strategy.In summary, melting type high manganese high silicon low fluorine flux not only performs well under ordinary welding conditions, but also shows irreplaceable advantages under various special environments such as high temperature, low temperature, corrosion, and humidity. It is not only a product of the development of modern welding technology, but also one of the important materials to promote the high-quality development of industry.
