Heatproof alloy vermicular cast iron and method for preparing same

A technology of vermicular graphite cast iron and heat-resistant alloy, which is applied in the field of preparation of heat-resistant alloy vermicular graphite cast iron and the above-mentioned heat-resistant alloy vermicular graphite cast iron, and can solve the problem of low oxidation resistance and thermal conductivity of alloy matrix, decline of mold service performance, pearl luster. The problem of instability of the body matrix, etc., can achieve the effect of removing the annealing treatment process, improving the service life, and avoiding inoculation and recession.

Active Publication Date: 2013-01-02
SUZHOU DONGHAI GLASS MOLD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 graphiti

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] According to the proportion of mass percentage, C 3.1%, Si 3.4%, Mn 0.20%, Ni0.20%, Mo 0.40%, Al0.5%, the rest is Fe and unavoidable impurities to make alloy materials, in a 250Kg medium frequency induction furnace Put the steel scrap and Z18 cast iron pig iron weighed according to the proportion into the medium frequency induction melting furnace to heat and melt completely, then add FeSi75 ferrosilicon, ferromanganese, ferromolybdenum charge and electrolytic nickel to melt and adjust the temperature of molten iron to 1450 ℃.

[0021] Vermicularization treatment, inoculation treatment and pouring: place 2.0% of Er-Mg-Ca vermative agent and 0.5% of Al-10%Sr master alloy (10mm size) in the bottom of the ladle or pit type The pit of the spheroidizing treatment ladle is then covered with a pressed iron sheet; the molten iron is added to the ladle, and at the same time, the 4mm-sized 75SiFe inoculant is added along with the flow, and the amount of the inoculant accounts for...

Embodiment 2

[0025]According to the proportion of mass percentage, C 2.6%, Si 4.5%, Mn 0.40%, Ni0.30%, Mo 0.60%, Al0.8%, the rest is Fe and unavoidable impurities to prepare alloy materials, in a 250Kg medium frequency induction furnace Put the steel scrap and Z18 cast iron pig iron weighed according to the ratio into the medium frequency induction melting furnace to heat and melt completely, then add FeSi75 ferrosilicon, ferromanganese, ferromolybdenum charge and electrolytic nickel to melt and adjust the temperature of molten iron to 1550 ℃;

[0026] Vermicularization treatment, inoculation treatment and pouring: place 1.2% of Er-Mg-Ca vermative agent and 0.8% of Al-10%Sr master alloy (20mm size) in the bottom of the ladle or pit type The pit of the spheroidizing treatment ladle is then covered with a pressed iron sheet; the molten iron is added to the ladle, and at the same time, the 8mm-sized 75SiFe inoculant is added with the flow, and the amount of the inoculant accounts for 0.8% of ...

Embodiment 3

[0030] According to the proportion of mass percentage, C 2.9%, Si 4.0%, Mn 0.30%, Ni0.25%, Mo 0.50%, Al0.6%, the rest is Fe and unavoidable impurities to make alloy materials, in a 250Kg medium frequency induction furnace Put the steel scrap and Z18 cast iron pig iron weighed according to the ratio into the medium frequency induction melting furnace to heat and melt completely, then add FeSi75 ferrosilicon, ferromanganese, ferromolybdenum charge and electrolytic nickel to melt and adjust the molten iron temperature to 1500 ℃;

[0031] Vermicularization treatment, inoculation treatment and pouring: place 1.6% of Er-Mg-Ca vermative agent and 0.6% of Al-10%Sr master alloy (15mm size) in the bottom of the ladle or pit type The pit of the spheroidizing treatment ladle is then covered with a pressed iron sheet; the molten iron is added to the ladle, and at the same time, the 6mm-sized 75SiFe inoculant is added with the flow, and the amount of the inoculant accounts for 0.6% of the t...

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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...

Claims

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Application Information

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IPC IPC(8): C22C37/10C22C33/08
Inventor 刘希琴刘子利
Owner SUZHOU DONGHAI GLASS MOLD
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