Low-nickel aging strengthening type iron-nickel based corrosion resistant alloy and preparation method thereof

The invention relates to a low-nickel aging strengthening type iron-nickel based corrosion resistant alloy. The alloy is prepared from the following components in percentage by weight: 36.0-42.0 percent of Ni, 19.0-25.0 percent of Cr, 3.0-6.0 percent of Mo, 1.0-3.50 percent of Cu, 1.5-3.0 percent of Ti, 0.2-0.6 percent of Al, less than or equal to 0.5 percent of Nb, less than or equal to 0.03 percent of C, less than or equal to 0.5 percent of Si, less than or equal to 0.5 percent of Mn, less than or equal to 0.0010 percent of S, less than or equal to 0.005 percent of P, 0.01-0.6 percent of trace elements and the balance of Fe. The alloy has high strength, high toughness and high corrosion resistance of existing iron-nickel based alloy. Compared with existing iron-nickel based alloy, the alloy has the advantages of better thermal processing performance and lower cost.