The present invention provides a method of manufacturing Type 321 stainless steel which effectively prevents nozzle clogging problem which is a problem in casting 321 stainless steel, which is a typical Ti-added stainless steel, and inhibits the formation of TiN, secures casting stability,;To achieve the above object, the present invention provides a method of producing a tundish molten steel having a composition comprising 0.025 to 0.04% of C and 0.2% or more of Ti, wherein the ratio of Ti / C is 8 or more by weight in molten steel, ) Is controlled to be equal to or lower than the concentration calculated by the equation of Log (N%) =-19755 / (T + 273) + 7.78 + 0.07 [% Ti]-log [% Ti] + 0.045 [% Cr] The present invention provides a method of manufacturing Type 321 stainless steel which prevents clogging and inhibits the formation of TiN to secure casting stability and improve product surface quality.
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