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Production method of heat-resistant spheroidal graphite cast iron for gas inlet housing

A technology for ductile iron and gas intake, which is applied in the production field of heat-resistant ductile iron for gas intake casing, can solve the problems that cannot be widely promoted, cannot be applied to gas intake casing castings, and the production cost of alloy steel is high. Strength, grain refinement, and the effect of increasing the number of graphite nodules

Active Publication Date: 2014-01-01
RIYUE HEAVY IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the high temperature characteristics of the gas, the castings of the gas inlet shell currently used require the castings to have certain high temperature resistance to ensure their mechanical properties at high temperatures. Generally, heat-resistant alloy steel is used to produce castings, but because the production cost of alloy steel is relatively high. High, cannot be widely promoted
Although the cost of ductile iron castings is low, ordinary ductile iron castings cannot be used for gas intake shell castings in high temperature environments

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Using pig iron, scrap steel, ferrosilicon, ferromanganese, and ferromolybdenum as raw materials, put pig iron and scrap steel into an intermediate frequency induction furnace for melting, then add ferrosilicon, ferromanganese, and ferromolybdenum to melt to obtain raw iron liquid, and heat the raw iron liquid to 1465°C , using the flushing method for spheroidization, the spheroidizer is a rare earth magnesium ferrosilicon alloy, and the addition amount is 1.6% of the total weight of the molten iron. In the inoculation process, 75 ferrosilicon inoculants are used for inoculation when the iron is tapped, and the particle size is 3-8mm , the added amount is 0.5% of the molten iron, and the silicon-calcium-barium inoculant is used to inoculate with the flow before pouring, the particle size is 0.2-1mm, and the added amount is 0.1% of the total weight of the molten iron; finally, the following components by weight percentage are obtained Composition of molten iron: C 3.26%, S...

Embodiment 2

[0017] Using pig iron, scrap steel, ferrosilicon, ferromanganese, and ferromolybdenum as raw materials, put pig iron and scrap steel into an intermediate frequency induction furnace for melting, then add ferrosilicon, ferromanganese, and ferromolybdenum to melt to obtain raw iron liquid, and heat the raw iron liquid to 1520°C , using the flushing method for spheroidizing, the spheroidizing agent is light rare earth spheroidizing agent (the mass percentage of its composition is: Re 0.5-1.5%, Mg 6.0-8.0%, Si 38-45%) and the balance is iron, adding The amount is 2% of the total weight of molten iron. In the inoculation process, strontium-silicon-iron alloy (mass percentage of composition: Sr 1.3-1.8%, Si 70-75%, and the balance is iron) inoculant is used for inoculation during the inoculation process. The particle size is 3-8mm, the added amount is 0.3% of the molten iron, and the silicon calcium barium inoculant is used for inoculation before pouring, the particle size is 0.2-1mm...

Embodiment 3

[0020] Using pig iron, scrap steel, ferrosilicon, ferromanganese, and ferromolybdenum as raw materials, put pig iron and scrap steel into an intermediate frequency induction furnace for melting, then add ferrosilicon, ferromanganese, and ferromolybdenum to melt to obtain raw iron liquid, and heat the raw iron liquid to 1465°C , using the flushing method for spheroidization, the spheroidizer is a rare earth magnesium ferrosilicon alloy, and the addition amount is 1.55% of the total weight of the molten iron. In the inoculation process, 75 ferrosilicon inoculants are used for inoculation when the iron is tapped, and the particle size is 3-8mm , the added amount is 0.6% of the molten iron, and the silicon calcium barium inoculant is used to inoculate with the flow before pouring, the particle size is 0.2-1mm, and the added amount is 0.1% of the total weight of the molten iron; the final composition is obtained by the following weight percentage Composition of molten iron: C 3.31%,...

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Abstract

The invention discloses a production method of heat-resistant spheroidal graphite cast iron for a gas inlet housing. The production method comprises a material preparation process, a smelting process, a spheroidizing process, an inoculating process and a casting process. The heat-resistant spheroidal graphite cast iron for the gas inlet housing comprises the following components in percentage by weight: 3.00 to 3.40% of C, 3.60 to 4.00% of Si, 0.30 to 0.60% of Mn, not greater than 0.050% of P, not greater than 0.020% of S, 0.010 to 0.030% of Re, 0.020 to 0.060% of Mg, 0.40 to 0.70% of Mo, and the balance of iron. The heat-resistant spheroidal graphite cast iron for the gas inlet housing, produced by the method, is high in high-temperature strength and has oxidation resistance, anti-growth resistance and other heat-resistant performances.

Description

technical field [0001] The invention relates to a production method of nodular cast iron, in particular to a production method of heat-resistant nodular cast iron for gas intake shells. Background technique [0002] The surface of cast iron will be oxidized to form an oxide film when it is used at high temperature for a long time, and it will thicken with time. When cast iron is used for a long time under high temperature conditions, another unique phenomenon will occur. The volume or size of the casting will increase irreversibly, which is called the growth of the casting. The growth process is accompanied by a sharp decline in mechanical properties, oxidation and Growth eventually leads to failure of the casting. [0003] Due to the high temperature characteristics of the gas, the castings of the gas inlet shell currently used require the castings to have certain high temperature resistance to ensure their mechanical properties at high temperatures. Generally, heat-resist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/10C22C37/10
Inventor 郑燕华张坤王铎傅明康宋贤发
Owner RIYUE HEAVY IND
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