Patent · US Active

Ferritic stainless steel pipe having excellent salt tolerance in gap, pipe-end-thickened structure, welding joint, and welded structure

US11215299B2 · kind B2 · utility

1Cited by

0References

17Claims

0Family size

Assignee

NIPPON STEEL STAINLESS STEEL CORPORATION · JP

Inventors

Masatoshi Abe · Tokyo, JP
Junichi Hamada · Tokyo, JP
Nobuhiko Hiraide · Tokyo, JP

Key dates

Filing date	Mar 27, 2018
Grant date	Jan 4, 2022
Priority date	—
Expiry date	Aug 14, 2038

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF16L9/02
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

This ferritic stainless steel pipe contains, by mass %: C: 0.001% to 0.100%; Si: 0.01% to 2.00%; Mn: 0.01% to 2.00%; P: 0.001% to 0.05%; S: 0.0001% to 0.005%; Cr: 10.5% to 20.0%; Sn: 0.001% to 0.600%; Ti: 0.001% to 1.000%; Al: 0.001% to 0.100%; and N: 0.001% to 0.02%, with a balance being Fe and unavoidable impurities, the ferritic stainless steel pipe includes a pipe-end-thickened portion at a pipe end portion, and a gap distance d (μm) formed at the pipe end portion satisfies a relationship of d≥Cr2/(1000Sn) (in the expression, Cr and Sn represent amounts (mass %) of respective elements).

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.