Austenite stainless steel material, method for producing same, and plate spring
AssigneeNippon Steel Corporation
InventorsMasaya Tanaka, Naoki Hirakawa
Life of this patent
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Abstract
An austenitic stainless steel material comprises, on a mass basis, 0.200% or less of C, 4.00% or less of Si, 5.00% or less of Mn, 4.00 to 10.00% of Ni, 12.00 to 18.00% of Cr, 3.50% or less of Cu, 1.00 to 5.00% of Mo, and 0.200% or less of N, a total amount of C and N of 0.100% or more, and the balance being Fe and impurities; wherein the austenitic stainless steel material has a value of Md30 of −40.0 to 0° C., wherein the value of Md30 is represented by the following equation (1): Md30=551−462(C+N)−9.2Si−8.1Mn−29(Ni+Cu)−13.7Cr−18.5Mo (1) in which the symbols of the elements each represents a content (% by mass) of each element.
Claims8
An austenitic stainless steel plate,
- wherein the austenitic stainless steel plate comprises, on a mass basis, 0.200% or less of C, 4.00% or less of Si, 5.00% or less of Mn, 4.00 to 10.00% of Ni, 12.00 to 18.00% of Cr, 3.50% or less of Cu, 1.00 to 5.00% of Mo, and 0.200% or less of N, a total amount of C and N of 0.100% or more, and the balance being Fe and impurities;
- wherein the austenitic stainless steel plate has a value of Md30 of −40.0 to 0° C., the value of Md30 being represented by the following equation (1):
- Md
- 30
- =
- 551
- -
- 462
-
- (
- C
- +
- N
- )
- -
- 9.2
- Si
- -
- 8.1
- Mn
- -
- 29
-
- (
- Ni
- +
- Cu
- )
- -
- 13.7
- Cr
- -
- 18.5
- Mo
- (
- 1
- )
- in which the symbols of the elements in equation (1) each represents a content % by mass of each element;
- wherein the austenitic stainless steel plate has a metallographic structure having a dislocation density of a strain-induced martensite phase of 8.0×1016 m−2 or less, a dislocation density of a retained austenite phase of 1.5×1016 to 6.0×1016 m−2, and a content of the strain-induced martensite phase of 20 to 55% by volume;
- and
- wherein the austenitic stainless steel plate has a thickness of 0.20 mm or less.
Dependencies are inferred from the claim text.