The invention relates to a preparation process of
nickel-saving type double-phase stainless steel, comprising the following steps of: 1) controlling components of a mother solution in an electric furnace as follows: more than 1.0% of C, less than 1.0% of Si, 12-21% of Cr, 1.5-1.9% of Ni and less than 0.025% of P, controlling a tapping temperature at 1580-1630 DEG C, and mixing the mother solution in the electric furnace with a high-carbon ferro-chrome mother solution in an intermediate-frequency furnace to form a mixed mother solution, wherein the high-carbon ferro-chrome mother solution contains the following components of 6-10% of C, less than 0.5% of Si, less than 0.06% of P, 62-72% of Cr and the balance of iron; and 2) blending the mixed mother solution into an AOD (
Argon Oxygen Decarburization) furnace to carry out
oxygen blowing and
decarburization,
nitrogen blowing and component adjustment, refining in a steel
ladle refining furnace and adding a micro-
alloy into the components, and finally adjusting, wherein the adjusted chrome-
nickel equivalence ratio is more than or equal to 2.2. The chrome-
nickel equivalence ratio is properly controlled to be good for forming double-phase stainless steel high-temperature ferrite so that heat
machining is carried out in a single-phase region to the greatest extent; and furthermore, the preparation process is good for the high-temperature
plasticity of the double-phase stainless steel.