HIGH-CARBON MARTENSITIC STAINLESS STEEL AND A PRODUCTION METHOD THEREFOR

摘要

The present invention relates to a production method for high-carbon martensitic stainless steel as used in razor blades, knives and the like, which contains from 0.40 to 0.80 wt.% of carbon and from 11 to 16 wt.% of chromium as the main components. Provided is a production method for high-carbon martensitic stainless steel in a strip-casting device, wherein steel for stainless steel containing, as percentages by weight, from 0.40 to 0.80% of carbon and from 11 to 16% of chromium is supplied from a tundish, via a nozzle to a molten steel pool in such a way that a stainless-steel thin sheet is cast, and the cast stainless-steel thin sheet is made into hot-rolled annealed strips using in-line rollers to a rolling reduction of from 5 to 40% immediately after casting such that the primary carbides within the hot-rolled annealed strip microstructure are no more than 10 µm, and also provided is martensitic stainless steel produced by means of the production method. By reducing the size of the primary carbides formed in the cast structure and the hot-rolled sheet to no more than 10 µm, the present invention produces high-carbon martensitic stainless steel having outstanding blade-end quality for use in cutting implements.