Metal powder core type flux-cored wire

The invention discloses a metal powder core type flux-cored wire. The metal powder core type flux-cored wire comprises a carbon steel sheath and powder filled in the carbon steel sheath, wherein the powder comprises the following raw materials in percentage by weight: 0.20-1.5% of TiO2, 0.5-1.0% of ZrSiO4, 0.3-0.6% of bauxite, 0.1-0.4% of Bi2O3, 0.1-0.50% of Na2O, 0.4-1.0% of Si, 1.5-2.1% of Mn, 0.3-0.6% of Cr, 0.2-0.7% of Ni, 0.15-0.25% of Ti, 0.004-0.012% of B, and the balance iron powder. The metal powder core type flux-cored wire can prevent such problems as more splashing and more welding slag in high-speed welding, improves the low-temperature impact performance of weld metal, improves the elongation of the weld metal, reaches the ultralow hydrogen level of the diffusible hydrogen content of the weld metal, and can be suitable for all-position welding. 本发明公开了一种金属粉芯型药芯焊丝，包括碳钢外皮及填充在碳钢外皮内的药粉；所述药粉包括以下重量百分比的原料：TiO2 0.20～1.5％，ZrSiO4 0.5～1.0％，铝矾土0.3～0.6％，Bi2O3 0.1～0.4％，Na2O 0.1～0.50％，Si 0.4～1.0％，Mn 1.5～2.1％，Cr