Patent ID: 11890665
Assignee: PROTERIAL, LTD.
Field: Materials, metallurgy (Chemistry)
Classification: CPC B  C  F | IPC B  C  F

Claim 0:
1. A metal gasket consisting of, in terms of % by mass, C: 0.10% or less, Si: 1.0% or less, Mn: 2.0% or less, P: 0.04% or less, S: 0.01% or less, Ni: 25.0% to 60.0%, Cr: 10.0% to 20.0%, one or both of Mo and W satisfying Mo+W/2: 0.05% to 5.0%, Al: 1.6% to 3.0%, Ti: 1.5% to 3.0%, Nb: 0.3% to 2.5%, V: 1.0% or less, B: 0.001% to 0.015%, Mg: 0.0005% to 0.01%, wherein S/Mg: 1.0 or less, N: 0.01% or less, O: 0.005% or less, and a remainder consisting of Fe and unavoidable impurities,
wherein the metal gasket has a metal structure having an austenite matrix,
wherein either:
a precipitate γ′ phase is not present in the austenite matrix; or,
if a precipitate γ′ phase is present in the austenite matrix, the precipitate γ′ phase present in the austenite matrix has an average equivalent circle diameter smaller than 25 nm,

wherein the precipitate γ′ phase consists of constituent elements selected from the group consisting of Ni, Al, Ti, and Nb, and
wherein the metal gasket has a thickness of 1 mm or less.