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US 8,894,924 B2Granted
Ferrite stainless steel with low black spot generation
AssigneeNippon Steel & Sumikin Stainless Steel Corporation
InventorsTooru Matsuhashi, Michio Nakata
Life of this patent
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Abstract
This ferrite stainless steel includes: by mass %, C: 0.020% or less; N: 0.025% or less; Si: 1.0% or less; Mn: 0.5% or less; P: 0.035% or less; S: 0.01% or less; Cr: 16% to 25%; Al: 0.15% or less; Ti: 0.05% to 0.5%; and Ca: 0.0015% or less, with the balance being Fe and inevitable impurities, wherein the following formula (1) is fulfilled, BI=3Al+Ti+0.5Si+200Ca≦0.8 (1) (wherein Al, Ti, Si, and Ca in the formula (1) represent contents (mass %) of the respective components in the steel).
Claims6
A ferrite stainless steel with low black spot generation in welded portions, comprising:
- by mass %,
- C:
- 0.020% or less;
- N:
- 0.025% or less;
- Si:
- 0.25% or less;
- Mn:
- 0.5% or less;
- P:
- 0.035% or less;
- S:
- 0.01% or less;
- Cr:
- 19.1 to 22.6%;
- Al:
- 0.04% to 0.13%;
- Ti:
- 0.05% to 0.19%;
- Ca:
- 0.0003% to 0.0015%;
- either one or both of V:
- 0.05% to 0.2% and Zr:
- 0.05% to 0.2%;
- and
- a balance of Fe and unavoidable impurities,
- wherein the stainless steel has a BI value ≦0.8, and
- BI=3Al+Ti+0.5Si+200Ca.
25 more elements
Dependencies are inferred from the claim text.