Medium silicon molybdenum alloy vermicular graphite cast iron glass mold material and preparation method thereof

Abstract

The invention discloses a medium silicon molybdenum alloy vermicular graphite cast iron glass mold material and a preparation method thereof, and belongs to the technical field of glass mold materials. The medium silicon molybdenum alloy vermicular graphite cast iron glass mold material is composed of, by weight, 3.0-3.2% of carbon, 3.9-4.2% of silicon, 0.3-0.5% of manganese, 0.2-0.4% of molybdenum, 0.08-0.12% of titanium, phosphorus less than 0.05%, sulphur less than 0.03% and the rest iron. The method comprises the steps of smelting, pouring and forming, and annealing. According to the invention, the cost is lowered, the effect is improved, the content of ferrite in the matrix is increased, the plasticity is improved, the elongation rate is increased, the strength of the ferrite matrix is improved, the creep resistance in the process of using molds at high temperature is improved, the oxidation resistance is improved, the hot rack resistance is improved, the oxidation peeling resistance is good, the toughness is improved, and the service life is longer.

Description

technical field [0001] The invention belongs to the technical field of glass mold materials, and relates to a medium-silicon-molybdenum alloy vermicular graphite cast iron glass mold material and a preparation method thereof. Background technique [0002] Glass mold is the main equipment for producing glass products. It is frequently in contact with high-temperature glass melt at 600°C-1100°C, and is subjected to the effects of oxidation, growth, heat exchange, and thermal fatigue. At the same time, due to frequent mold opening and closing, Therefore, the contact surface of the mold is required to have excellent wear resistance. Specifically, the surface of the inner cavity of the glass mold is required to have good high temperature resistance, wear resistance, oxidation resistance and corrosion resistance to prolong the service life. At the same time, the outer circle of the glass mold is required to have excellent heat dissipation performance to ideally adapt to High-spee...

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Problems solved by technology

[0009] However, as known in the industry, the D-type graphite cast iron mentioned in the aforementioned CN101942619B is a new type of gray cast iron. Because its graphite is generated between developed austenite dendrites, the size of graphite is very small, and the developed austenite Bulk dendrites will destroy the continuity of graphite, so the thermal conductivity will be lower than that of conventional A-type graphite gray cast iron; secondly, its forming should have sufficient undercooling as mentioned in the above literature, so the production of all-D-type graphite Generally, under-inoculation is used to increase the degree of supercooling (inoculation treatment can reduce the degree of supercooling), quenching of cold iron and adding a large amount of strong carbide alloying elements such as V, Ti, Mo to increase the degree of supercooling. Although it is mentioned how to control the formation of carbides, However, this material covers almost all the alloying elements that have been used in glass molds. How to avoid carbides when using so many strong carbide-forming elements is still a worldwide problem, so too much attention is paid to the complex element ratio It is easy to form composite large-scale massive carbides that are difficult to eliminate by high-temperature graphitization annealing, and the measures taken to form D-type graphite, such as adding V, Ti, and Mo to increase the supercooling degree of molten iron, are just to promote the formation of carbides One of the ways, so in the two opposites of this contradiction, it is inevitable that large-scale composite carbides will be generated in the material, so the toughness of the material will be greatly reduced, and finally the ability of the mold material to absorb thermal fatigue shock will be significantly reduced. The service life of the mold