High-chromium cast iron and preparation method thereof

Abstract

The invention discloses high-chromium cast iron which comprises the following chemical components in percentage by weight: 2.3%-2.7% of C, 14%-16% of Cr, 0.4%-0.6% of Mo, 0.3%-0.5% of Ni, 0.3%-0.5% of Cu, 0.8%-1.3% of Si, 0.6%-1.0% of Mn, not more than 0.04% of S, not more than 0.04% of P and the balance of Fe. A preparation method of the high-chromium cast iron comprises the following steps: smelting in a smelting furnace to form molten alloy, deoxidizing, adding 0.3%-0.6% of a compound inoculant and 0.1%-0.2% of a compound modifier based on the total weight of the molten alloy for inoculating and modifying for the first time, and pouring the molten alloy into a casting ladle for inoculating and modifying for the second time, wherein 0.2%-0.4% of the compound inoculant and 0.3%-0.6% of the compound modifier based on the total weight of the molten alloy are prearranged in the casting ladle, the compound inoculant is a Ti-V-CaO-BaCO3-Zn compound inoculant, and the compound modifier is a rare earth ferrosilicon alloy modifier. According to the preparation method, the recession resistance of an inoculation and modification structure can be improved, so that the high-chromium cast iron is relatively good in bending strength and wear resistance.

Description

technical field [0001] The invention relates to the technical field of casting, in particular to a high-chromium cast iron and a preparation method thereof. Background technique [0002] High-chromium cast iron is an important class of wear-resistant materials, and has been widely used in various wear-resistant parts. For example, the liner and blade of the concrete mixer main engine are made of high-chromium cast iron. [0003] At present, the inoculation and modification treatment methods of the melt in the preparation process of high chromium cast iron are usually one-time addition of a single rare earth ferrosilicon or single rare earth magnesium for modification treatment, or adding a single strong carbide-forming element to form a hard alloy. Alloy carbide for inoculation treatment. However, using the existing one-time addition method, it is impossible to perform desulphurization and dephosphorization treatment at the same time as the effective inoculation and modific...

AI Technical Summary

Problems solved by technology

However, using the existing one-time addition method, it is impossible to perform desulphurization and dephosphorization treatment at the same time as the effective inoculation and modification treatment, and the effect of inoculation and modification treatment such as grain refinement and carbide dispersion in the microstructure is also very good. Limited, will affect the performance of wear-resistant castings

In addition, using the existing one-time adding method, the effect of inoculation and deterioration treatment is likely to change over time, and the actual effect is difficult to sustain, so that the phenomenon of inoculation and deterioration tissue decline will occur. Moreover, in the actual operation process, if a certain If there is a failure in one process link or other reasons, the effect of inoculation and deterioration treatment will even be lost.

In addition, only adding a single strong carbide-forming element for inoculation treatment may also easily affect the actual use effect of inoculation treatment due to other more active elements

Images