Ferritic stainless steel sheet for automobile brake disk rotors, automobile brake disk rotor, and hot-stamped article for automobile brake disk rotors
AssigneeNippon Steel Stainless Steel Corporation
InventorsToshiki YOSHIZAWA, Tooru MATSUHASHI
Life of this patent
Estimating the term…
Abstract
A ferritic stainless steel sheet for an automobile brake disc rotor includes: 0.001 to 0.05 mass % of C; 0.001 to 0.05 mass % of N; 0.3 to 4.0 mass % of Si; 0.01 to 2.0 mass % of Mn; 0.01 to 0.05 mass % of P; 0.0001 to 0.02 mass % of S; 10 to 20 mass % of Cr; one or both of 0.001 to 0.5 mass % of Ti and 0.01 to 0.8 mass % of Nb; and a balance consisting of Fe and impurities. After a hot stamping treatment, a crystal grain size is in a range from 100 to 200 μm, and precipitates each having a grain size of 500 nm or less are present at a density of 0.01 to 20 pieces per square micrometer.
Claims16
A ferritic stainless steel sheet for an automobile brake disc rotor, comprising:
- 0.001 to 0.05 mass % of C;
- 0.001 to 0.05 mass % of N;
- 0.3 to 4.0 mass % of Si;
- 0.01 to 2.0 mass % of Mn;
- 0.01 to 0.05 mass % of P;
- 0.0001 to 0.02 mass % of S;
- 10 to 20 mass % of Cr;
- one or both of 0.001 to 0.5 mass % of Ti and 0.01 to 0.8 mass % of Nb;
- and
- a balance consisting of Fe and impurities, wherein
- through a heat treatment (hereinafter referred to as a “hot stamping pseudo heat treatment”) in which the steel sheet is heated to 1000 degrees C. and subsequently cooled by being retained in a range from 890 to 700 degrees C. for one to ten minutes, a crystal grain size is in a range from 100 to 200 μm, and precipitates each having a grain size of 500 nm or less are at a density of 0.01 to 20 pieces per square micrometer, and
- the ferritic stainless steel sheet is a ferritic stainless steel for hot stamping.
A ferritic stainless steel sheet for an automobile brake disc rotor, comprising:
- 0.001 to 0.05 mass % of C;
- 0.001 to 0.05 mass % of N;
- 0.3 to 4.0 mass % of Si;
- 0.01 to 2.0 mass % of Mn;
- 0.01 to 0.05 mass % of P;
- 0.0001 to 0.02 mass % of S;
- 10 to 20 mass % of Cr;
- one or both of 0.001 to 0.5 mass % of Ti and 0.01 to 0.8 mass % of Nb;
- and
- a balance consisting of Fe and impurities, wherein
- the ferritic stainless steel sheet in which a crystal grain size is in a range from 100 to 200 μm and precipitates each having a grain size of 500 nm or less are present at a density of 0.01 to 20 pieces per square micrometer is in a form of a hot-stamped product.
3-4. (canceled)
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Dependencies are inferred from the claim text.