Ultralow-carbon cobalt-free high-strength corrosion-resistant alloy as well as preparation method and application thereof

The invention relates to an ultralow-carbon cobalt-free high-strength corrosion-resistant alloy as well as a preparation method and application thereof. The alloy comprises the following components in percentage by weight: 11.0 to 16.0 percent of Cr; 1.0 to 3.5 parts of Al; 1.0 to 2.0 parts of Mo; 8.0 to 11.0 parts of Ni; 0 to 1.5 parts of Ti; 0 to 0.1 part of Si; c: 0.0001 to 0.05 part; 0 to 0.1 part of V; 0 to 0.1 part of Ce; 0 to 0.1 part of B; 0 to 0.1 part of Zr; 0.001 to 0.1 part of N; s: 0.0001 to 0.01 part; the content of P is 0.0001 to 0.01; and the balance of Fe. Meanwhile, the mass ratio of Al to Ti is controlled to be (4-5.5): 1, and the mass ratio of Ni to (Al + Mo + Ti) is controlled to be (3.1-4.7): 1; the metal raw materials are subjected to vacuum melting and gas atomization powder making, and ultralow-carbon cobalt-free high-strength corrosion-resistant alloy powder is obtained; after ultra-low carbon cobalt-free high-strength corrosion-resistant alloy powder is screened, the powder spherici