The application of PP30N8H6M3STYu powder wire is considered which ensures high scale-resistance of welded metal. It is defined that the scale formation indices of 30N8H6M3STYu metal are much better than those in 30H2V8F steel at the temperature of 900ºC. It is shown that the scale base of 30N8H6M3STYu metal is chemical compounds of Fe2O3, Fe3O4, Cr2FeO4, Fe2NiO4 and Fe3N.