| 摘要 |
PROBLEM TO BE SOLVED: To prevent occurrence of longitudinal cracks mainly when producing stainless steel containing≥0.1 mass% B by a continuous casting process. SOLUTION: In the continuous casting method for stainless steel containing≥0.1 mass% B, the over-heating temperature of molten steel in a tundish is controlled to -15 to +30°C, and the spouting angle of a spouting hole in an immersion nozzle in the molten steel in a mold is defined as -15 to +25°upward. Mold flux added onto the surface of the molten steel in the mold contains an exothermic agent composed of metal or alloy and the basicity in the mold flux is made to 1.1-1.8. A water injecting ratio of secondary cooling water for injecting toward the surface of a cast slab is made to 0.1-1.0 l/kg and the continuous casting is performed. In this way, the continuously cast slab for B-containing stainless steel less in surface defects of the cast slab such as longitudinal cracks can be produced in the continuous casting for stainless steel containing≥0.1 mass% B. COPYRIGHT: (C)2007,JPO&INPIT
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