Method for manufacturing cast iron

Abstract

The invention discloses a method for manufacturing cast iron, which comprises the following step of: inputting a filling material to the periphery of an electrode in a medium-frequency electric furnace, wherein the filling material comprises an iron source mixture and a carbon-containing reducer, and the iron source comprises scrap iron or steel; and the method is characterized in that four elements of Ni, Cr, Mo and Cu are also added in an iron casting process. The alloy is as follows by weight percent: 0.5 to 1 percent of Ni, 0.01 to 0.15 percent of Cr, 0.15 to 0.6 percent of Mo and 0.35 to 0.6 percent of Cu. The invention solves the problem of poorer quality of the cast iron in the prior art and provides the manufacturing method for manufacturing the cast iron with better abrasion resistance, heat resistance, corrosion resistance, low-temperature resistance and non-magnetic performance.

Description

technical field [0001] The invention relates to a method for manufacturing cast iron, in particular to a method for manufacturing alloy cast iron with other auxiliary elements added. Background technique [0002] Cast iron is an iron-carbon alloy with a carbon content of more than 2%. Industrial cast iron generally has a carbon content of 2% to 4%. Carbon exists mostly in the form of graphite in cast iron, and sometimes in the form of cementite. In addition to carbon, cast iron also contains 1% to 3% silicon, and elements such as manganese, phosphorus, and sulfur. Carbon and silicon are the main elements affecting the microstructure and properties of cast iron. Alloy cast iron is obtained by adding appropriate amount of alloying elements (such as silicon, manganese, phosphorus, nickel, chromium, molybdenum, copper, aluminum, boron, vanadium, tin, etc.) to ordinary cast iron. Cast iron alloys are used in the automotive industry to manufacture cast products that must be hi...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of poor cast iron quality in the prior art, the present invention provides a method for manufacturing cast iron with good wear resistance, heat resistance, corrosion resistance, low temperature resistance and non-magnetic properties