A kind of sintered flux for submerged arc welding of x100 pipeline steel and preparation method thereof

Abstract

The invention aims at providing sintering flux for submerged-arc welding of X100 pipeline steel and a preparation method for the sintering flux. By means of the sintering flux, the technical problem that many toxic substances and acid or corrosive gas produced due to incomplete combustion, which can easily occur during welding of the X100 pipeline steel, of the sintering flux containing halogen elements have potential threats to human health and the environment is solved. Meanwhile, the alkalinity is improved, so that the low-temperature impact toughness of weld metal is improved. Besides, the electrical conductivity during welding is enhanced, and the electrochemical corrosion resistant performance of welded joints is improved. The sintering flux comprises chemical components of, 45-55 wt.% of MgO, 3-5 wt.% of Al2O3, 5-10 wt.% of CaO, 5-8 wt.% of SiO2, 2-3 wt.% of MnO, 8-10 wt.% of TiO2, 3-5 wt.% of FeO, 2-3 wt.% of ZrO2, 5-10 wt.% of Na2O and 3-4 wt.% of K2O.

Description

technical field [0001] The invention belongs to the field of flux, and in particular relates to a sintered flux for submerged arc welding of X100 pipeline steel and a preparation method thereof. Background technique [0002] Medium-thick plates and coils used in the manufacture of oil, natural gas gathering and long-distance pipelines or coal, building material slurry pipelines, etc. are called pipeline steel (steel for pipeline). Generally, medium and thick plates are used to make thick-walled straight seam welded pipes, while coils are used to produce straight seam resistance welded pipes or submerged arc spiral welded pipes. The country has a production capacity of 700,000 t / a spiral welded pipes with a diameter within 1800mm, and has established a production line for straight seam thick-walled pipes with a diameter within 1600mm. It is only over 10 years in China that the pipeline steel that meets the pipeline engineering design requirements of the API5L standard can be...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a flux for submerged arc welding of X100 pipeline steel and its preparation method, to solve the problem that the sintered flux containing halogen elements is prone to incomplete combustion during the welding process of X100 pipeline steel, and many toxic substances and acid or Corrosive gases, technical issues with potential threats to human health and the environment