What material is not suitable for melt blowing

       Low carbon steel, medium carbon steel with a carbon content of less than 0.4%, structural steel with a total amount of Mn, Mo, and V less than 3.0%, Cr-Ni stainless steel, gray cast iron, malleable cast iron and ductile iron, low-carbon pure iron And other metal substrates can be sprayed and melted various self-fluxing alloys.



The following materials are not suitable for spray melting.



(1) Materials with a melting point lower than that of fused alloys, such as brass, bronze, tin, lead, etc.



(2) Materials with higher oxygen affinity than B and Si, such as aluminum, magnesium, titanium and their alloys, etc., but steels with a total content of Al, Mg, and Ti less than 0.5% can still be melted.



(3) For free-cutting steel with high S content, during remelting, S and Ni in the alloy of the spray-melt layer form brittle nickel sulfide, which affects the combination of the spray-melt layer.



(4) Materials with high brittleness and hardness. During the heating process, this material is prone to large tissue stress or phase transformation expansion during the cooling process, resulting in the matrix bursting or the melt-blown layer cracking. Such materials include NiCr-Mo alloy, martensitic stainless steel containing more than 13% chromium, etc.



(5) For surface carburized or nitrided materials, the carburized layer should be removed, otherwise boron carbide and boron nitride will be formed with B in the blown alloy, resulting in cracks or spalling.