Ferritic stainless steel

US9365915B2 · kind B2 · utility

Assignee

• JFE Steel Corporation · JP

Inventors

• Tetsuyuki Nakamura · Chiba, JP
• Hiroki Ota · Tokyo, JP
• Hiroyuki Ogata · Chiba, JP

Key dates

• Filing date: Oct 11, 2012
• Grant date: Jun 14, 2016
• Expiry date: Oct 11, 2032

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C21D9/46
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Provided is a ferritic stainless steel excellent in terms of thermal fatigue resistance and oxidation resistance without adding Mo or W, which is an expensive chemical element and with controlling the Nb content to be as small as possible. The chemical composition contains, by mass %, C: 0.020% or less, Si: 3.0% or less, Mn: 3.0% or less, P: 0.040% or less, S: 0.030% or less, Cr: 10% to 25%, N: 0.020% or less, Nb: 0.005% to 0.15%, Al: less than 0.20%, Ti: 5×(C %+N %) to 0.5%, Mo: 0.1% or less, W: 0.1% or less, Cu: 0.55% to 2.0%, B: 0.0002% to 0.0050%, Ni: 0.05% to 1.0%, and the balance being Fe and inevitable impurities, where C % and C5 in the expression 5×(C %+N %) respectively represent the contents (mass %) of the chemical elements C and N.