Method for casting super-large centrifugal cold mould by adopting nodular cast iron

Abstract

The invention relates to a method for casting a super-large cold mould of nodular cast iron. The cold mould comprises the following main matrixes in percentage by weight: 75 to 95 percent ferrite and 5 to 25 percent pearlite. The liquid iron after inoculation and spheroidization comprises the following components in percentage by weight: 2.9 to 4.5 percent of C, 2.0 to 3.5 percent of Si, less than 0.6 percent of Mn, less than 0.2 percent of P, less than 0.03 of S, 0.02 to 0.08 percent of Mg, 0.02 to 0.08 percent of Re and the balance of Fe, wherein the total amount of the components is 100 percent. The method realizes the super-large centrifugal cold mould cast from the nodular cast iron, ensures the strength of the cold mould, shortens the manufacturing period, greatly reduces the manufacturing cost and ensures the quality of rollers.

Description

technical field [0001] The invention relates to the technical field of manufacturing a centrifugal roll mold, in particular to a casting method of a super-large nodular cast iron cold mold. Background technique [0002] In the prior art, the cold profile material of the centrifugal roll is divided into four types: gray iron, ductile iron, cast steel and forged steel. For small and medium-sized hot-rolled plates (weight less than 25 tons), gray iron, ductile iron and cast steel are mainly used. For the cold forming of large, medium and thick plate rolls, forged steel is mainly used in China, and some of them are made of cast steel. Nodular cast iron material has not been applied to the super large cold type of more than 30 tons. If the forged steel cold form is high in strength, the production cycle is long, which affects the delivery date of the roll; the forged steel cold form is expensive, and the market price per ton is at least 20,000 yuan / ton, while the cost of produc...

AI Technical Summary

Problems solved by technology

If the forged steel cold form is high in strength, the production cycle is long, which affects the delivery date of the roll; the forged steel cold form is expensive, and the market price per ton is at least 20,000 yuan / ton, while the cost of producing ductile iron rolls in the factory is 4,500 Within RMB / ton, the cost of each cold mold can be reduced by about 500,000 yuan; the forged steel cold mold is easy to deform after long-term use