HIGHLY CORROSION RESISTANT METAL PART AND METHOD FOR PRODUCING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a highly corrosion resistant metal part having a novel modified part of high corrosion resistance.SOLUTION: The highly corrosion resistant metal part according to the present invention comprises: a base part of a base metal; and a modified part formed on at least a part of the base part, in which the modified part consists of a nitrogen solid solution fine structure containing 0.05 to 5 mass% (hereinafter, abbreviated to "%") of nitrogen (N) when the total mass is 100% and having an average crystal particle diameter of 10μm or less. Such modified part may be obtained by applying a high energy beam while moving relatively onto a surface of a stainless steel and the like. The high energy beam is, for example, a near ultraviolet nano second pulse laser having a short wavelength in near ultraviolet region and having a pulse width of 10 ps to 100 ns. The modification process enables achieving a high corrosion resistance comparable to conventional super stainless steel even when the base metal is a general purpose austenite stainless steel or a ferritic stainless steel.