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|1. (WO2017061216) STAINLESS STEEL PIPE WITH EXCELLENT CORROSION RESISTANCE|
|Applicants:||NISSHIN STEEL CO., LTD.
|Title:||STAINLESS STEEL PIPE WITH EXCELLENT CORROSION RESISTANCE|
A stainless steel pipe with excellent corrosion resistance is provided which does not rust prematurely even in waterfront environments affected by sea salt particles, and a manufacturing method thereof are provided. This stainless steel pipe with excellent corrosion resistance has longitudinal unidirectional polishing marks on the surface of the ferrite-base stainless steel pipe. The pitting potential is 0.6 V or greater, the 60° gloss is 75 or less, the composition is C: 0.020 mass% or less, Si: 0.40 mass% or less, Mn: 0.40 mass% or less, Cr: 25.00-32.00 mass%, Mo: 1.00-4.00 mass%, P: 0.030 mass% or less, S: 0.020 mass% or less, Ni: 0.50 mass% or less and N: 0.020 mass% or less, the remainder consisting of Fe and unavoidable impurities, and the pitting index (PI = Cr mass% + 3 Mo mass%) being 30 or greater.