Heatproof alloy vermicular cast iron and method for preparing same

Abstract

The invention discloses heatproof alloy vermicular cast iron and a method for preparing the same. The vermicular cast iron comprises, by weight, 2.6% to 3.1% of C, 3.4% to 4.5% of Si, 0,20% to 0.40% of Mn, 0.20% to 0.30% of Ni, 0.40% to 0.60% of Mo, 0.5% to 0.8% of Al, 0.05% to 0.08% of Sr, 0.02% to 0.04% of Ca, 0.04% to 0.06% of Mg, 0.03% to 0.05% of Er and the balance being Fe and unavoidable impurities. Smelting and vermiculizing treatment, inoculation and pouring are performed on the materials, wherein the tapping temperature after smelting is in a range between 1450 DEG C to 1550 DEG C, slagging-off pouring is performed to molten iron after in-ladle flushing and along-flow inoculation. Material tissues of the alloy vermicular cast iron are that vermicular graphite with a vermiculizing rate of 5 to 60 is distributed on a ferrite matrix, not only high toughness, heat conductance and high temperature oxidation resistance proprieties are provided, but also good casting process performances are provided, and the cast iron can be used for manufacturing glass molds and light alloy metal casting moulds which bear high temperature forming liquid thermal shock and cold and hot alternate alternating stress for a long time.

Description

technical field [0001] The invention relates to a heat-resistant alloy vermicular graphite cast iron. The vermicular graphite cast iron is especially suitable for preparing molds for glass products manufacturing, metal mold casting, etc., which are subjected to thermal shock of high-temperature forming liquid and alternating stress of cold and heat for a long time, and belongs to heat-resistant metal materials. technology field. The invention also relates to a preparation method of the heat-resistant alloy vermicular graphite cast iron. Background technique [0002] Metals work under high temperature conditions, which usually produce phenomena such as oxidation and growth. Oxidation refers to the erosion of oxidizing atmosphere at high temperature, which produces oxidized peeling on the metal surface, and reduces the bearing capacity of castings due to the reduction of the effective section of the metal. Growth refers to the irreversible volume growth of metals at high tem...

AI Technical Summary

Problems solved by technology

Although Mo and Ni alloying elements have the effect of stabilizing pearlite, the pearlite matrix is ​​still unstable for high melting point glass frit, high melting point liquid metal mold casting and large molds, and its graphitization precipitation process will lead to cast iron Growth leads to mold cracking and scrapping. Therefore, the oxidation resistance and thermal conductivity of the alloy matrix are low, and the performance of the mold is reduced.