CARBON STEEL MATERIAL BEFORE HEAT TREATMENT AND CARBON STEEL MATERIAL AFTER HEAT TREATMENT HAVING EXCELLENT SCALE REMOVABILITY AND METHOD FOR PREPARING THE SAME, METHOD FOR REMOVING SCALE, AND FILM FORMING AGENT EASY TO REMOVE SCALE

摘要

It provides a new technology that can easily remove scale generated by heating steel materials. In the pre-heat treatment steel material having a film on the surface of the carbon steel, the carbon steel contains 0.06 mass% or more of carbon based on the total mass of the carbon steel, and the film is at least one metal selected from Fe, Ni, and Co. It contains element (X) and at least one metal element (Y) selected from Ti, Zr, Hf, Nb, V, Cr, Mn, Mo, and W, and the total amount of the metal element (Y) attached is 1 to It is a steel material before heat treatment, characterized in that (X)/(Y), which is 100 mg/m2 and a mass ratio of the metal element (X) and the metal element (Y), is in the range of 0.01 to 0.5.