| 摘要 |
PURPOSE:To inspect the central segregation of a continuously cast material simply and rapidly on the scene without necessitating the cutting of a special test pieces, by directly coating the cross area of the continuously cast material with a solvent solution prepared by dissolving a non-oxidative acid in a non- oxidative solvent low in vapor pressure to precipitate carbon. CONSTITUTION:When a continuously cast material 1 is cooled to an appropriate temp., for example, 100-150 deg.C, a surface 2 to be inspected is conditioned by a grinding means 3. A place to be inspected is directly coated with a solvent prepared by dissolving a non-oxidative acid high in iron dissolving power, having a high b.p. and low in vapor pressure such as sulfuric acid or phosphoric acid in a non-oxidative solvent well dissolving a reaction product such as polyhydric alcohols, having a high b.p. and low in vapor pressure. When the solvent 4 is coated by a spray means 5, the dissolution of steel on the surface to be inspected and the decomposition of carbon or carbide are simultaneously and amorphous carbon 8 is precipitated. The segregation of this precipitated carbon in recorded by a visual observing camera 6 or the fabrication of carbon print due to a sticky tape 7 to inspect central segregation. |
