| 摘要 |
<p>PURPOSE: A high-carbon martensitic stainless steel using a cold rolling batch annealing furnace process and a manufacturing method thereof are provided to form a high-carbon martensitic stainless steel with a yield strength and a low hardness by securing the uniformity of the size and distribution of a ferrite phase and a carbide within a high-carbon martensitic stainless steel and a carbide and distribution by optimizing such conditions as heating and annealing condition. CONSTITUTION: A high-carbon martensitic stainless steel is composed of, in wt%: C 0.30-0.80, Cr 11-16 as main components, Si 0.1-1.0, Mn 0.1-1.0, Ni over 0-less than 1.0, N over 0-less than 0.04, S over 0-lesstan 0.04, and P over 0- less than 0.05. The high-carbon martensitic stainless steel is composed of, in wt%: one of Mo over 0-less than 2, W over 0-less than 2, and other Fe and unavoidable impurities, and comprises a martensitic micro-structure composed of a ferrite phase and carbide. A batch annealing component after a cold rolling is 250Hv or less in hardness and 500Mpa in yield strength. The grain size of the ferrite phase is 2micrometers or greater. The hardness difference is 20Hv between the stainless steel of the batch annealing component after cold rolling and the stainless steel of the continuous annealing after a cold rolling. The strength difference is 250MPa between the stainless steel of the batch annealing component after cold rolling and the stainless steel of the continuous annealing after a cold rolling. [Reference numerals] (AA) Temperature(°C); (BB) Temperature raising; (CC) Cracking step; (DD) Annealing step; (EE) Time(minutes)</p> |
