CONTINUOUS CASTING METHOD FOR STAINLESS STEEL

摘要

PURPOSE:To maintain the lubricity in a casting mold at all times even under such mold oscillation conditions under which oscillation mark depth as thin as <=250mu is obtd. by admitting adequately a liquid lubricating agent into the space between the mold and solidified shell under the molten metal surface of the mold. CONSTITUTION:The following treatment is made in the stage of continuous casting of a sainless steel (e.g.; SUS340 steel ) under the oscillation conditions of the casting mold 1 under which the depth of the oscillation marks is <=250mu and under the control of the viscosity of mold powder. The liquid lubricating agent is admitted 2 into the space between the mold 1 and the solidified shell 6 from the part lower than the layer 5 of the mold powder to be supplied onto the molten metal surface. The defective lubrication between the mold 1 and the shell 6 is thereby averted and therefore the economical effect owing to rolling without conditioning and the effect of improving productivity are inexpensively attained. The inflow of the liquid lubricating agent is >=30mm h and the supply rate of the liquid lubricating agent to satisfy the relation expressed by the equation is required >= 1 Kinks among vegetable oils, fatty esters and mineral oils are preferably used for the liquid lubricating agent.