| 摘要 |
<p>A region is formed in some of a surface of a metal plate to be subjected to radiation heating with near infrared rays, the region having a lower reflectance of radiation rays than the original metal plate surface. As a treatment for reducing the reflectance, use can be made of coating or thermal spraying in a blackish color, plating in a blackish color, a treatment for enhancing the surface roughness of the metal plate, blasting, etching, blackening, a treatment for changing the material of the surface of the metal plate, or the like. The metal plate thus treated is heated by radiation to obtain a heated metal plate partly having a different temperature, and this metal plate is subjected to thermal processing accompanied by cooling, for example, hot stamping.</p> |
