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Oxidation-resistant alloying grey cast iron and preparation method thereof

A gray cast iron, oxidation resistance technology, applied in the oxidation resistance alloyed gray cast iron, the preparation field of the oxidation resistance alloyed gray cast iron, can solve the instability of the pearlite matrix, the oxidation resistance of the alloy matrix and the Problems such as low thermal conductivity and reduced mold performance can achieve the effect of reducing oxygen content, improving service life and promoting uniform distribution

Active Publication Date: 2014-04-23
SUZHOU DONGHAI GLASS MOLD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Although Mo, Ni, and Cr 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 casting and large molds, and its graphitization precipitation process will lead to The growth of cast iron, therefore, the oxidation resistance and thermal conductivity in the alloy matrix are lower, and the serviceability of the mold is reduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] According to the proportion of mass percentage, C 3.2%, Si 2.0%, Mn 0.50%, Cr 0.10%, Ni0.20%, Mo 0.30%, Al0.5%, and the rest is Fe and unavoidable impurities. Add steel scrap and Z18 cast iron pig iron weighed according to the ratio to the 250Kg intermediate frequency induction furnace and put them into the intermediate frequency induction melting furnace to heat and melt them completely, then add FeSi45 ferrosilicon, ferromanganese, ferrochrome, ferromolybdenum and electrolytic nickel to melt Adjust the molten iron temperature to 1450°C;

[0026] Inoculation treatment and pouring: Zinc particles (5mm in size) accounting for 0.1% of the total weight of the furnace charge (during the inoculation treatment process, under the action of high-temperature molten iron, zinc will be strongly gasified, and its residual rate in the alloy liquid is only About 5% of the amount, the following examples are the same), aluminum blocks (10mm size) broken by industrial aluminum ingots an...

Embodiment 2

[0029] According to the proportion of mass percentage, C 3.0%, Si 1.8%, Mn 0.70%, Cr 0.50%, Ni0.30%, Mo 0.50%, Al3.0%, and the rest is Fe and unavoidable impurities. Add steel scrap and Z18 cast iron pig iron weighed according to the ratio to the 500Kg intermediate frequency induction furnace and put them into the intermediate frequency induction melting furnace to heat and melt them completely, then add FeSi45 ferrosilicon, ferromanganese, ferrochrome, ferromolybdenum and electrolytic nickel to melt and Adjust the molten iron temperature to 1550°C;

[0030] Inoculation treatment and pouring: 0.3% zinc particles (4mm size) of the total weight of the charge, aluminum blocks (20mm size) broken from industrial aluminum ingots and 0.8% Al-10%Sr master alloy (20mm size) are placed in the casting The bottom of the ladle or the pit of the pit-type spheroidizing ladle, and then cover it with a pressed iron sheet; add the molten iron into the ladle, and at the same time add the 8mm siz...

Embodiment 3

[0033] According to the proportion of mass percentage, C 3.1%, Si 1.9%, Mn 0.60%, Cr 0.30%, Ni0.25%, Mo 0.40%, Al1.5%, the rest is Fe and unavoidable impurities, and the alloy material is prepared at 250Kg Add steel scrap and Z18 cast iron pig iron weighed according to the ratio to the intermediate frequency induction furnace and put them into the intermediate frequency induction melting furnace to heat and melt them completely, then add FeSi45 ferrosilicon, ferromanganese, ferrochrome, ferromolybdenum and electrolytic nickel to melt and adjust The temperature of the molten iron is 1500°C;

[0034] Inoculation treatment and pouring: 0.2% zinc particles (6mm size), broken aluminum ingots (15mm size) from industrial aluminum ingots and 0.7% Al-10%Sr master alloy (15mm size) are placed in the pouring process. The bottom of the ladle or the pit of the pit-type spheroidizing ladle, and then covered with a pressed iron sheet; the molten iron is added to the ladle, and at the same ti...

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Abstract

The invention discloses an oxidation-resistant alloying grey cast iron and a preparation method of the oxidation-resistant alloying grey cast iron. The cast iron comprises the following components by mass percentage: 3.0-3.2% of C, 1.8-2.0% of Si, 0.50-0.70% of Mn, 0.10-0.50% of Cr, 0.20-0.30% of Ni, 0.03-0.50% of Mo, 0.5-3.0% of Al, 0.05-0.08% of Sr, 0.005-0.15% of Zn, and the balance of Fe and inevitable impurities. The preparation method comprises the steps of melting raw materials, culturing and processing, and pouring, wherein the tapping is carried out at 1450 to 1550 DEG C after melting; the molten iron is processed by being flushed in a ladle and cultured and processed along with the flow, and then slagged and casted. According to the oxidation-resistant alloying grey cast iron provided by the invention, the organization of the grey alloying cast iron material is structured by distributing 6-8 grades of D type graphite with little graphite of A type on a ferrite substrate, so that higher toughness, high heat conductivity and high-temperature oxidization resistance can be achieved, and good casting technical performance can be ensured as well; and the oxidation-resistant alloying grey cast iron can be applied to manufacturing a glass die and a light alloy metal type casting die which can bear the heat impacting of high-temperature formed liquid and cold-heat alternating stress for a long time.

Description

technical field [0001] The invention relates to an oxidation-resistant alloyed gray cast iron, which is suitable for making molds for glass products manufacturing, metal mold casting, etc., which are subjected to thermal shock of high-temperature forming liquids and alternating stresses of cold and heat for a long time, and belongs to heat-resistant metals. field of materials technology. The present invention also relates to a preparation method of the above oxidation-resistant alloyed gray 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 temperatures due to chemical metallurgi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C37/10C22C33/08
Inventor 刘希琴刘子利钱燕张全林
Owner SUZHOU DONGHAI GLASS MOLD
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