Manganese-silicon high-chromium cast iron and preparation method thereof

Abstract

The invention discloses a preparation method of manganese-silicon high-chromium cast iron, which comprises the steps of dosing scrap steel, pig iron, ferrochromium, ferromanganese and ferrosilicon according to a proportion that the carbon content in the product is 2.2-2.8%, the chromium content is 13-15%, the manganese content is 3-5%, the silicon content is 2-4%, the sulfur content is less than or equal to 0.05%, the phosphorus content is less than or equal to 0.05% and the balance is iron; melting the scrap steel and pig iron in an induction furnace, and performing pre-deoxygenation operation; then adding ferrochromium, ferromanganese and ferrosilicon to obtain molten iron; adjusting the molten iron to meet the requirements of qualified molten iron, and heating to perform final deoxygenation; discharging and pouring to obtain cast iron; performing air cooling on the obtained cast iron; heating and tempering to obtain manganese-silicon high-chromium cast iron. The process is simple, and the dosing is reasonable; the prepared manganese-silicon high-chromium cast iron has good impact toughness and high hardness and reaches the performance standard for Cr15Mo3 high-chromium cast iron while the production cost of the raw materials is reduced.

Description

technical field [0001] The invention belongs to the field of wear-resistant metal materials, in particular to a manganese-silicon high-chromium cast iron and a preparation method thereof. Background technique [0002] High chromium cast iron is a kind of wear-resistant material with excellent performance, which has the characteristics of high hardness and high impact toughness. The typical grade of high chromium cast iron is Cr15Mo3 white iron. Adding 3% molybdenum to this type of high chromium cast iron increases the hardenability of high chromium cast iron and obtains a full martensitic matrix structure. The molybdenum element is a precious alloy element, which is a scarce resource in our country. It is expensive, which increases the production cost of molybdenum-based high-chromium cast iron. In order to reduce the production cost of molybdenum-based high-chromium cast iron, the most effective method is to reduce the amount of molybdenum added, but after reducing the amo...

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Problems solved by technology

[0003] Manganese can play a role similar to that of molybdenum in improving the hardenability of high-chromium cast iron. However, due to the strong ability of manganese to stabilize austenite in the matrix of high-chromium cast iron, there is too much residual austenite in the structure. In use, the residual austenite undergoes martensitic transformation under the action of external force, and the casting is easy to crack due to the stress formed by volume expansion

The method of reducing the content of molybdenum in high chromium cast iron by adding boron or rare earth elements, the production process is complicated, the performance is unstable, and the mechanical properties of high chromium cast iron are not ideal

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