Preparation method of wear-resistant nodular cast iron

Abstract

The invention provides a preparation method of wear-resistant nodular cast iron, relates to the technical field of metallurgy, in particular to the field of nodular cast iron, which comprises the following components in parts by mass: 3.6 to 3.9 parts of C, 2.6 to 3.0 parts of Si, 0.4 to 0.6 part of Mn, 0 to 0.1 part of P, 0 to 0.02 part of S, 0.03 to 0.06 part of Mg, 0.5 to 0.8 part of Cu, 0.1 to0.3 part of Cr, 0.9 to 1.1 parts of Mo and 0.01 to 0.02 part of Ti, 0.001 to 0.003 part of Sb, 0 to 0.007 part of As, 0.001 to 0.002 part of Pb, 0 to 0.001 part of Bi, 0 to 0.003 part of Al, 0 to 0.002 part of B and the balance of Fe. The preparation method comprises the following steps of step (1), raw material preparation; (2) raw material smelting; (2) spheroidizing treatment; (4) pouring; and(5), heat treatment. According to the preparation method of the wear-resistant nodular cast iron provided by the invention, the hardenability of the iron casting is improved in the mode of adding a proper amount of Cu and Mo elements, meanwhile, a ladle covering method spheroidizing treatment mode is adopted, so that the preparation process is good in stability, convenient to operate and low in preparation cost, and finally, the nodular cast iron has better wear resistance in a high-temperature normalizing heat treatment mode.

Description

technical field [0001] The invention relates to the field of ductile cast iron, in particular to a preparation method of wear-resistant nodular cast iron. Background technique [0002] Since the advent of ductile cast iron in the last century, with its excellent performance, it can replace cast steel in many fields. In the mold industry, most of the existing molds in my country are made of forged die steel. This year, Japan and other countries have begun to use ductile iron instead. Forging die steel to produce stamping dies is not only low in cost, but also graphite has the characteristics of solid lubrication, which greatly reduces the friction between the die and the steel plate, improves the contact state between the die and the steel plate, and makes the surface shape of the formed parts more ideal, but in use In the process, this type of ductile iron must have good heat resistance in addition to good heat resistance, and the current traditional ductile iron is difficult ...

AI Technical Summary

Problems solved by technology

[0002] Since the advent of ductile cast iron in the last century, with its excellent performance, it can replace cast steel in many fields. In the mold industry, most of the existing molds in my country are made of forged mold steel. This year, Japan and other countries have begun to use ductile iron instead. Forging die steel to produce stamping dies is not only low in cost, but also graphite has the characteristics of solid lubrication, which greatly reduces the friction between the die and the steel plate, improves the contact state between the die and the steel plate, and makes the surface shape of the formed parts more ideal, but in use In the process, this type of ductile iron must have good heat resistance in addition to good heat resistance, and the current traditional ductile iron is difficult to meet these requirements, and the current wear-resistant ductile iron on the market often exists This has the disadvantages of high production cost and unsatisfactory wear-resisting effect.

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