Apparatus and method for rapidly heating cold-rolled strip steel

An apparatus for heating cold-roiled strip steel, comprising a heating zone, a soaking zone, and a cooling zone, wherein the heating zone is divided into a first heating section, a second heating section, a third heating section, and a fourth heating section sequentially along a moving direction of the strip steel to be heated,

• wherein the First heating section is provided with a first radiant heater utilizing gas heating or electric heating, and the first heating section is configured to heat the strip steel to a temperature in a range between 200° C. and 100° C. below a target Curie temperature;
• wherein the second heating section is provided with a first induction heater with a first induction coil, and the second heating section is configured to heat the strip steel to a temperature in a range between 300° C. and 50° C. below the target Curie temperature,
• wherein the third heating section is provided with a second induction heater with a second induction coil, and the third heating section is configured to heat the strip steel to a temperature in a range between 30° C. below the target Curie temperature and 3° C. below the target Curie temperature;
• wherein the fourth heating section is provided with a second radiant heater utilizing gas heating or electric heating, and the fourth heating section is configured to heat the strip steel to a temperature above the target Curie temperature;
• and
• wherein at least one multi-wavelength first plate thermometer is disposed between the first heating section and the second heating section, at least one multi-wavelength second plate thermometer is disposed between the second heating section and the third heating section, and at least one multi-wavelength third plate thermometer is disposed between the third heating section and the fourth heating section.