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Vermicularizing treatment process of vanadium-titanium vermicular graphite cast iron

A vermicular graphite cast iron, processing technology, applied in the field of material metallurgy, can solve the problems of slow reaction, weak creeping ability of calcium-based vermicular agent, low absorption rate, etc.

Active Publication Date: 2012-10-31
CHONGQING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Magnesium-based vermicular agents have the strongest creeping ability and self-boiling ability, but their addition range is small and their absorption rate is low; calcium-based vermicular agents have the weakest creeping ability, their addition range is wide, but their reaction is slow. No self-boiling ability; the creeping ability and reaction speed of the rare earth vermiculant are between the magnesium-based and calcium-based vermiculants, and the creeping ability is moderate, but there is no self-boiling ability

Method used

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  • Vermicularizing treatment process of vanadium-titanium vermicular graphite cast iron
  • Vermicularizing treatment process of vanadium-titanium vermicular graphite cast iron
  • Vermicularizing treatment process of vanadium-titanium vermicular graphite cast iron

Examples

Experimental program
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Effect test

Embodiment 1

[0034] This embodiment is used to prepare the cylinder head of an automobile engine. The raw materials of this embodiment are configured as the following components by weight percentage: carbon is 3.4%, silicon is 2.8%, manganese is 0.9%, phosphorus is 0.10%, sulfur is 0.07%, vanadium is 0.10%; titanium is 0.10%, and the balance is Iron and unavoidable impurities. The 1320°C high-temperature molten iron obtained after melting the vanadium-titanium magnetite is directly transferred to the intermediate frequency furnace for smelting, and the melting temperature is 1560°C. Before the molten iron is released from the furnace, the pouring treatment bag is baked at 300°C, and then the vermicular agent, 2 / 3 of 75SiFe and the slag covering agent are placed at the bottom of the bag for compaction; the vermicular agent is rare earth ferrosilicon (brand and chemical The composition is shown in Table 1) and the mixture of rare earth magnesium ferrosilicon (see table 2 for the grade and c...

Embodiment 2

[0041] This embodiment is used to prepare automobile brake drums. The raw materials of this embodiment are configured as the following components by weight percentage: carbon is 3.7%, silicon is 2.6%, manganese is 0.7%, phosphorus is 0.09%, sulfur is 0.05%, vanadium is 0.20%; titanium is 0.15%, and the balance is Iron and unavoidable impurities. The 1330°C high-temperature molten iron obtained after melting the vanadium-titanium magnetite is directly transferred to the intermediate frequency furnace for smelting, and the smelting temperature is 1530°C. Before the molten iron is released from the furnace, the pouring treatment ladle is baked at 350°C, and then the vermicular agent, 2 / 3 of 75SiFe and slag covering agent are placed at the bottom of the ladle for compaction; the vermicular agent is rare earth ferrosilicon and rare earth magnesium silicon A mixture of iron, wherein the weight percentage of rare earth ferrosilicon is 70%, the specific composition of rare earth ferr...

Embodiment 3

[0044] This embodiment is used to prepare automobile brake discs. The raw material of embodiment 3 is configured as following components by weight percentage: carbon is 3.9%, silicon is 2.1%, manganese is 0.5%, phosphorus 0.08%, sulfur 0.03%, vanadium is 0.35%; Titanium is 0.25%, and balance is Iron and unavoidable impurities. The 1350°C high-temperature molten iron obtained after melting the vanadium-titanium magnetite is directly transferred to the intermediate frequency furnace for smelting, and the melting temperature is 1500°C. Before the molten iron comes out of the furnace, the pouring treatment ladle is baked at 450°C, and then the vermicular agent, 2 / 3 of 75SiFe and the slag covering agent are placed at the bottom of the ladle for compaction; the vermicular agent is rare earth ferrosilicon and rare earth magnesium silicon A mixture of iron, wherein the weight percentage of rare earth ferrosilicon is 80%, the specific composition of rare earth ferrosilicon and rare ea...

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Abstract

The invention discloses a vermicularizing treatment process of vanadium-titanium vermicular graphite cast iron. The process comprises the following steps: preparing raw materials into the following components by weight percent: 3.4-3.9% of carbon, 2.1-2.8% of silicon, 0.5-0.9% of manganese, less than or equal to 0.10% of phosphorus, less than or equal to 0.07% of sulfur, 0.10-0.35% of vanadium, 0.1-0.25% of titanium and the balance of iron and inevitable impurities; melting vanadium-titanium magnetite, and then, directly transferring the obtained molten iron with a high temperature of 1320 DEG C-1350 DEG C into an intermediate frequency electric furnace for smelling; discharging the molten iron at the temperature of 1450 DEG C-1480 DEG C after the furnace components of the molten iron arequalified by testing; pouring the molten iron into a casting treatment ladle by using a crushing method for carrying out vermicularizing treatment and inoculation treatment; and after the treatment, standing for 2-3 minutes for casting. The process disclosed by the invention has the advantages of simple process flow and low energy consumption, the vanadium-titanium vermicular graphite cast iron prepared by the process disclosed by the invention has excellent properties, and various indexes meet the requirements.

Description

technical field [0001] The invention relates to the field of material metallurgy, in particular to a vermicular treatment process for vermicular graphite cast iron. Background technique [0002] Because gray cast iron has good casting performance, it is used in many fields. However, the physical and mechanical properties, mechanical strength, low temperature resistance and thermal fatigue resistance of products made of gray cast iron are unsatisfactory in the practical process, and thermal cracks and fast wear are prone to occur during use, causing certain safety hazards. Hidden danger. High-strength alloy gray cast iron can be obtained by adding alloy elements. For example, countries such as Britain and the United States mainly use high-C low-alloy V and Mo gray cast iron, and Russia and other countries mainly use Cr, Ni, and Mo alloy gray cast iron, but due to the addition of Ni, Mo, etc. Noble alloy elements make the production cost of the above alloy cast iron higher. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/08C22C37/04
Inventor 李华基刘宁薛寒松马昌恒饶劲松宋东波
Owner CHONGQING UNIV