The invention belongs to the technical field of high-
corrosion-resistance stainless steel production, and particularly relates to high-
corrosion-resistance stainless steel and a manufacturing method thereof. The high-
corrosion-resistance stainless steel comprises a first material group, a second material group and a third material group. The first material group is prepared from the following raw materials, by weight: 0.08-0.15% of C, 0.01-0.6% of Si, 0.02-0.6% of Mn, 0.01- 0.03% of P, 0.0002-0.03% of S, 12- 14% of Cr, 0.8-1.5% of Mo, 1.2-6% of Bi, 0.1-0.3% of V and the balance iron. Through the arrangement of an elastic heat preservation bottom, when hot water is contained in a heat preservation inner cylinder and the heat preservation bottom, the
internal pressure of the heat preservation inner cylinder and the heat preservation bottom is gradually increased, and at the moment, the heat preservation bottom is deformed, so that the size is increased, the problem that a heat preservation cup cover is bounced off due to overlarge
internal pressure caused when the interior of the heat preservation inner cylinder and the interior of the heat preservation bottom are overfilled with water can be avoided, meanwhile the elastic heat preservation bottom can keep the interior of the heat preservation inner cylinder and the interior of the heat preservation bottom in a state similar to
constant pressure, and therefore, the problem that a sealing cover on a heat preservation cup is difficult to open when the temperature of water in the heat preservation inner cylinder and the heat preservation bottom is reduced after long-time storage is avoided.