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1. (WO2017061216) STAINLESS STEEL PIPE WITH EXCELLENT CORROSION RESISTANCE

Pub. No.:    WO/2017/061216    International Application No.:    PCT/JP2016/076143
Publication Date: Fri Apr 14 01:59:59 CEST 2017 International Filing Date: Wed Sep 07 01:59:59 CEST 2016
IPC: C22C 38/00
C22C 38/44
C22C 38/50
Applicants: NISSHIN STEEL CO., LTD.
日新製鋼株式会社
Inventors: SAIDA, Tomoaki
齋田 知明
TAI, Yoshikazu
田井 善一
IMAKAWA, Kazunari
今川 一成
Title: STAINLESS STEEL PIPE WITH EXCELLENT CORROSION RESISTANCE
Abstract:
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.