Bimetallic wear liner and its preparation method

A method of preparing a bimetallic wear liner, comprising the following steps:

• S1:
• molten metal melting:
• melting high chromium cast iron for a wear layer, and low alloy steel for a base layer, thereby obtaining molten iron of high chromium cast iron and molten steel of low alloy steel;
• S2:
• modeling:
• producing a molding flask formed by combining a cope and a drag, where a cavity is arranged between the cope and the drag, wherein the molding flask is provided with independent iron runners and steel runners, and wherein a parting line of the molding flask is a bimetallic metallurgical composite interface, an inner gate of the steel runner is arranged on the parting line of the drag, an inner gate of the iron runner is arranged on the parting line of the cope, the parting line of the cope is provided with an overflow port, the overflow port is communicated with a slag collecting tank, and a plurality of the overflow ports are respectively arranged on an opposite side of the inner gate of the iron runner and an opposite side of the inner gate of the steel runner;
• wherein the slag collecting tank is arranged inside the molding flask, a volume of the slag collecting tank under the parting line is larger than volume of the steel runner above the parting line;
• and wherein a blind riser is arranged inside the molding flask above the cavity;
• and the drag is provided with a steel mesh at a position 1-3 mm away from the parting line;
• and
• S3:
• pouring:
• covering an opening of the cavity communicating to outside with an organic film;
• pouring the molten steel of low alloy steel obtained in S1 into the cavity along the steel runner with a pouring temperature of 1541° C.-1555° C.;
• after an interval of time, pouring the molten iron of high chromium cast iron obtained in S1 into the cavity along the iron runner with a pouring temperature of 1486° C.-1500° C.;
• wherein a temperature difference of the pouring temperature is maintained within 15° C., thereby obtaining a liner.