Scale composition determination system, scale composition determination method, and program

A scale composition determination method that determines a composition of a scale generated on a surface of a steel material, the scale composition determination method comprising:

• a measurement step of measuring temperatures of the steel material at two wavelengths different from each other by radiation thermometry;
• and
• a determination step of determining whether or not hematite (Fe2O3) has been generated in an outermost layer of the scale based on a difference between the temperatures of the steel material measured by the measurement step, wherein
• a thickness of hematite at an intersection point of a hematite curve at, out of the two wavelengths, a first wavelength and a hematite curve at a second wavelength is determined so as to exceed an upper limit value of a thickness assumed as a thickness of hematite generated in the outermost layer of the scale, and
• the hematite curves are curves indicating the relationship between a thickness of hematite and a temperature of hematite.

A non-transitory computer-readable storage medium recording a program, executable by a computer processor including processing circuitry, for causing a computer to execute determination of a composition of a scale generated on a surface of a steel material, the program causing a computer to execute:

• an acquisition step of acquiring temperatures of the steel material at two wavelengths different from each other, the temperatures measured by radiation thermometry;
• and
• a determination step of determining whether or not hematite (Fe2O3) has been generated in an outermost layer of the scale based on a difference between the temperatures of the steel material acquired by the acquisition step, wherein
• a thickness of hematite at an intersection point of a hematite curve at, out of the two wavelengths, a first wavelength and a hematite curve at a second wavelength is determined so as to exceed an upper limit value of a thickness assumed as a thickness of hematite generated in the outermost layer of the scale, and
• the hematite curves are curves indicating the relationship between a thickness of hematite and a temperature of hematite.