Multi-component alloy cast iron preparation method

Abstract

The invention relates to a multi-component alloy cast iron preparation method, which is characterized by comprising: carrying out smelting of hot metal in an electric furnace, wherein hot metal comprises the following chemical components, by mass: 3.05-3.45% of C, 0.75-1.05% of Mn, 1.10-1.35% of Si, 0.03-0.07% of N, less than 0.06% of S, less than 0.08% of P, and the balance of Fe and inevitable trace impurities; discharging out of the electric furnace when the hot metal temperature is 1450-1480 DEG C; adding an inoculant along with the hot metal flow during the hot metal discharging process, wherein the amount of the inoculant is 0.8-1.2% of the mass of the hot metal; adding alloy wires into the hot metal by using a wire feeding machine after the hot metal enters a hot metal ladle, wherein the alloy wire addition amount is 2.5-3.5% of the mass of the hot metal in the hot metal ladle, and the size of the alloy wire is phi 2.5-4.0mm; carrying out pouring casting molding on the hot metal when the hot metal temperature is reduced to 1335-1370 DEG C; and opening the box, carrying out air cooling on the cast, heating the cast to achieve a temperature of 200-260 DEG C, carrying out thermal insulation for 6-10 h, and carrying out air cooling to achieve a room temperature to obtain the multi-component alloy cast iron cast with excellent performances.

Description

technical field

[0001] The invention relates to a method for preparing cast iron, in particular to a method for preparing multi-element alloy cast iron, and belongs to the field of casting technology. Background technique

[0002] Cast iron has been widely used in industrial production due to its good casting formability and simple smelting process. However, the microstructure of ordinary cast iron is coarse, and the graphite is in the form of coarse flakes, resulting in low cast iron toughness and poor safety in use. In order to improve the performance of cast iron, Chinese invention patent CN103225038A discloses a high carbon equivalent high Alloy gray cast iron, including C, Si, Mn, S, P elements, also added Cr, Sn elements and a small amount of Cu elements, the weight percentage is: C: 3.80-3.98; Si: 0.98-1.45; Mn: 0.62- 0.95; S: 0.02-0.122; P: 0.01-0.17; Cr: 0.3-0.6; Sn: 0.07-0.08; Cu: 0.02-0.2. The high-carbon-equivalent high-alloy gray cast iron with low copper cont...