Neutral sintered flux for submerged arc welding and preparation method thereof

The invention relates to a neutral sintered flux for submerged arc welding and a preparation method thereof. The neutral sintered flux is mainly prepared from, by weight, 20-30% of magnesia, 10-20% offluorite, 20-40% of corundum, 5-15% of manganese ore, 5-15% of marble, 10-20% of quartz, 2-10% of rutile and 2-8% of alloying agent. According to the neutral sintered flux for submerged arc welding,the magnesia, corundum and fluorite can ensure the purity and mechanical properties of welding seam metal, the marble, rutile, quartz and manganese ore can improve the oxidation and welding process performance of the flux, the neutral flux prepared by all the raw materials in a formula integrates the advantages of alkaline fluxes and acid fluxes, and the neutral flux is excellent in comprehensiveperformance, good in welding process performance and high in low-temperature impact energy of welding seams. 本发明涉及种埋弧焊用中性烧结焊剂及其制备方法。该中性烧结焊剂主要由以下重量百分比的原料制成：镁砂20～30％，萤石10～20％，刚玉20～40％，锰矿5～15％，大理石5～15％，石英10～20％，金红石2～10％，合金剂2～8％。本发