| 摘要 |
The present invention relates to a manufacturing method for high strength ultralow carbon steel slab by intensifying the initial solidification of steel and controlling to collect pinholes. The present invention comprises a step of steelmaking by adding 500 to 600 ppm of phosphorous (P) as a solid-solution intensifying element to a converter or molten steel in a second refining process; and a step of managing the pinhole defects of a slab by controlling tundish molten steel superheat into a predetermined temperature in a continuous cast for the steel added with phosphorous. [Reference numerals] (AA) Start;(BB) End;(S10) Steelmaking by adding phosphorous (P) in a second refining process;(S20) Managing the pinhole defects by controlling tundish molten steel superheat into a predetermined temperature;(S30) Removing the pinhole defects by scarfing in the predetermined depth |
