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A kind of micro-alloyed gray cast iron with high oxidation resistance and preparation method thereof

A micro-alloying and oxidizing technology, which is applied in the field of micro-alloying gray cast iron with high oxidation resistance and its preparation, can solve the problems that are not conducive to energy saving and emission reduction, cost a lot of labor and time, and cannot keep up with the production cycle. Achieve the effects of promoting formation, promoting graphitization, and increasing transition temperature

Active Publication Date: 2017-05-10
SUZHOU DONGHAI GLASS MOLD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In actual production, annealing requires a lot of labor and time for furnace loading, heat preservation, and furnace release.
First of all, it cannot keep up with the production cycle of glass molds with small batches and multiple specifications. Secondly, the annealing furnace will use a lot of electric energy, which is not conducive to the national policy of energy saving and emission reduction.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (100), ingredients: pig iron, scrap steel, recycled materials, industrial pure aluminum, electrolytic nickel, ferromolybdenum, ferrosilicon, ferromanganese, ferrotitanium; according to the mass percentage of chemical composition: C 3.65%, Si 2.2%, Mn 0.4% , P, S<0.1%, Mo 0.5%, Ni 0.35%, Al1.5%, Ti 0.25%, and the rest is Fe; use silicon-barium inoculant accounting for 0.5%-0.75% of the total weight of the furnace charge, calculated according to the chemical composition Measure each raw material and intermediate alloy; the pig iron is Q12 pig iron, and the ferrosilicon, ferromanganese, ferromolybdenum, and ferrotitanium used are the charge materials of nationally specified grades. The silicon-barium inoculant includes the following components by mass percentage: Ca 2-4%, Ba 4-6%, Al 1-2%, Si 68-73%, and the balance is Fe. The particle size range of the silicon-barium inoculant is 3-8mm.

[0028] (200) Ladle preparation: first dry the ladle, put the inoculant into the hig...

Embodiment 2

[0034] In step (100), the mass percentages of the chemical components are: C 3.60%, Si 2.3%, Mn 0.4%, P, S<0.1%, Mo0.55%, Ni 0.3%, Al 1.0%, Ti 0.3%, and the rest For Fe. In the step (600), an 85% ferrite matrix is ​​obtained, the 10mm inner cavity is D-type graphite of grade 5-8, and the outer circle is an A / D-type glass mold blank casting.

Embodiment 3

[0036] In step (100), the mass percentages of the chemical components are: C 3.70%, Si 2.4%, Mn 0.5%, P, S<0.1%, Mo 0.50%, Ni 0.4%, Al 2.0%, Ti 0.2%, and the rest For Fe. In the step (600), an 87% ferrite matrix is ​​obtained, the inner cavity is 5-8 grade D-type graphite, and the outer circle is an A / D-type glass mold blank casting.

[0037] The tensile strength of the glass mold blank casting is ≥200MPa, the Brinell hardness is 150±15HBS, the golden structure is: ferrite ≥80% in the as-cast state, the inner cavity is 5~8 grade D graphite, and the outer circle is D / A type graphite; at 750°C, the oxidation rate is ≤1.0g / (m 2 .h).

[0038] The microalloyed gray cast iron with high oxidation resistance and the preparation method thereof of the present invention have the following advantages:

[0039] From the root of cast iron, the composition of the chemical composition is the starting point. Mn element can be dissolved in the matrix to form a solid solution to increase th...

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Abstract

The invention discloses micro-alloying high-oxidation-resistance gray iron and a preparation method thereof. The micro-alloying high-oxidation-resistance gray iron and the preparation method thereof are used for preparing finished molds and primary molds of glass molds. The gray iron comprises, by mass, 3.55%-3.75% of C, 2.0%-2.4% of Si, 0.3%-0.5% of Mn, less than 0.1% of P, less than 0.1% of S, 0.4%-0.6% of Mo, 0.3%-0.4% of Ni, 1.0%-2.0% of Al, 0.2%-0.3% of Ti, and the balance Fe and inevitable impurities. In the production process, the technology of the pouring process is controlled, the temperature of sand shakeout is lower than 250 DEG C, and it is guaranteed that a casting does not generate a large number of pearlites due to the fact that the cooling speed is increased. Finally, the purpose of obtaining an 80% ferrite base body without the need of graphitizing annealing is achieved. Oxidation resistance and abrasion resistance of the material are improved, D-type graphite with the grade being 5-8 is arranged in an inner cavity of the casting within the range of 10 mm, and the outer circle and the middle of the casting are in the D type and in the A type respectively.

Description

technical field [0001] The invention relates to the field of glass mold materials, in particular to a microalloyed gray cast iron with high oxidation resistance and a preparation method thereof. Background technique [0002] With the rapid development of my country's glass mold industry in recent years, mold materials have made great progress. The scientific research units of each production enterprise have newly developed a variety of mold materials suitable for different models, different machine speeds, and different glass frit products. Among them, cast iron is the most basic, widely used and cost-effective material for glass molds. This trend remains unchanged. As a molding device for glass bottles and cans, it is also a medium for heat exchange between the glass frit and the surrounding environment. The inner cavity of the mold has to experience high temperature molten glass at about 1100 ° C, cyclic contact, and withstand cyclic thermal stress, high temperature oxida...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C37/10C22C33/08
Inventor 唐剑锋
Owner SUZHOU DONGHAI GLASS MOLD
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