A kind of gray cast iron and its smelting method

Abstract

The invention provides gray cast iron and a smelting method of the gray cast iron, and relates to the technical field of metallurgical materials. The gray cast iron is prepared from nonmetallic alloyelements, metal alloy elements and the balance iron and inevitable impurities, wherein the nonmetallic alloy elements comprise, by mass, 2.8-3.2% of C, 2.2-2.4% of Si, 0.2% or less of P, 0.15% or lessof S, the metal alloy elements comprise, by mass, 0.25-0.35% of Cr and at least one of Mn, Cu, Mo, Li, Sn and Sb, and the total content of the metal alloy elements except for Cr is 1.5-1.6%. According to the gray cast iron, by reasonably designing the chemical ingredients, the gray cast iron can meet performance requirements of machine tool basic parts, waste iron and waste steel can be adopted as main furnace materials, therefore, raw material selection and matching flexibility are improved, and the raw material cost and the production cost are reduced.

Description

technical field [0001] The invention belongs to the technical field of metallurgical materials, and in particular relates to a gray cast iron and a smelting method thereof, in particular to a high-strength machine tool type gray cast iron produced by using all waste materials and a smelting method thereof. Background technique [0002] Gray cast iron is widely used to make basic parts of machine tools because of its good damping performance or shock absorption and high wear resistance. Especially the guide rail, which is a key part of the machine tool, is usually made of high-strength gray cast iron because it needs to be repeatedly stressed when the machine tool is working. [0003] In order to strictly control the metallurgical properties of gray cast iron, it is generally necessary to strictly limit the chemical composition of gray cast iron. Correspondingly, the raw materials used to smelt gray cast iron are mostly steel plates and pig iron with relatively definite chemi...

AI Technical Summary

Problems solved by technology

However, due to the use of a considerable amount of recarburizer, the raw material cost reduction of cast iron is limited

[0007] It can be seen that, at present, regarding the smelting and casting of gray cast iron, although there have been reports exploring the use of scrap steel and recycled old materials as the main charge, because the existing gray cast iron has strict requirements on the type and content of alloys, scrap steel, recycled old materials, etc. The proportion of the main charge is limited, and the reduction of raw material cost is also limited

Images