| 摘要 |
The present invention relates to a martensitic stainless steel for use in knives such as a kitchen knife, and to a method for manufacturing same. More particularly, the present invention provides a martensitic stainless steel manufactured by strip casting and a method for manufacturing the martensitic stainless steel, in which the components of the steel are controlled such that C is 0.4 to 0.5%, N is 0.1 to 0.2%, Cr is 13 to 15%, Si is 0.1 to 1.0%, Mn is 0.1 to 1.0%, Ni exceeds 0 and is lower than 1.0%, C+N is 0.5% or higher and N/C is 0.2% or higher, wherein the remainder comprises Fe and other inevitable impurities. The size of the residual carbide of the martensitic stainless steel is 10 µm or lower and the hardness of the residual carbide is 55HRC or higher. The martensitic stainless steel of the present invention is manufactured by strip casting in such a manner that the length of the residual carbide remaining after strengthening heat treatment becomes 10 µm or lower when performing the strengthening heat treatment on the annealed hot rolled steel strip having a thickness of 1mm or higher manufactured by strip casting. Thus, a martensitic stainless steel to be used in knives such as a kitchen knife having excellent blade tip quality and superior hardness and corrosion-resistance can be obtained. |
