Preparation method of as-cast mixed matrix QT600-10 ductile iron

Abstract

The invention provides a preparation method of as-cast mixed matrix QT600-10 ductile iron. The preparation method comprises the following steps of S1, adding of raw materials: adding 40 to 60 percentby mass of pig iron, 25 to 40 percent by mass of scrap steel, 10 to 20 percent by mass of foundry returns and 0.1 to 0.3 percent by mass of electrolytic copper anode; S2, molten iron smelting: addingthe electrolytic copper anode after the scrap steel, pig iron and foundry returns are all smelted; S3, in-ladle melt treatment: placing a rare earth-containing nodulizing agent into one side of a bottommost part of a nodulizing ladle, placing a silicon-barium-calcium inoculant into an upper part of metal particles of the rare earth-containing nodulizing agent, and discharging molten iron into thenodulizing ladle for nodulizing and in-ladle inoculation, wherein the nodulizing treatment temperature is 1,500 to 1,550 DEG C; and S4, pouring: transferring the molten iron in the nodulizing ladle into a pouring site for pouring at a temperature of 1,380 to 1,420 DEG C, and adding a strontium-silicon following inoculant along with the molten iron during pouring. According to the preparation method, the content ranges of pearlite and ferrite in a matrix structure are regulated and controlled through the selection and control of raw materials as well as the alloy component design, so as to obtain a ductile iron material suitable for elevator parts.

Description

technical field [0001] The invention belongs to the field of high-performance metal materials, and in particular relates to a preparation method of as-cast mixed matrix QT600-10 nodular cast iron. Background technique [0002] With the development of casting technology, the production technology and application of high-performance ductile iron materials have made significant progress. In particular, obtaining high strength and high elongation in the as-cast state can effectively reduce production costs, and is favored by many enterprises and casting material researchers. extensive attention. For elevator parts, ductile iron has high strength and high elongation, which can not only improve the overall safety factor and fatigue life of the product, but also further optimize the product structure, reduce the product wall thickness and achieve weight reduction; it can also be used to replace Some steel materials can eliminate the casting defects of steel castings and promote th...

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Problems solved by technology

The methods disclosed in Chinese invention patent CN102230122A "a production method of nodular cast iron" and Chinese invention patent CN103981434A "a production method of high-strength nodular cast iron" cannot stably achieve as-cast elongation ≥ 10% in actual production; Chinese invention patent CN103710612A "A production method of as-cast ferrite-based nodular cast iron QT600-10", the matrix structure of the nodular cast iron prepared is ferrite structure, resulting in the inability to maintain the as-cast tensile strength ≥ 600MPa stably; In the Chinese invention patent CN106868395A "a production method of as-cast nodular cast iron with mixed matrix structure", trace elements Ca and Ba are added to the alloy composition, the melt treatment process is long, the operation is cumbersome, and the matrix graphite structure is unstable.

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