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Method for producing ductile iron castings from scrap steel

A technology for scrap steel and castings, which is applied in the field of producing ductile iron castings by using scrap steel, which can solve the problems of increasing processing difficulty and achieve the effects of low smelting cost, guaranteed casting performance, and reduced casting cost

Inactive Publication Date: 2020-12-11
四川青江机器股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The use of a large proportion of scrap steel to produce ductile iron castings greatly increases the difficulty of processing

Method used

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  • Method for producing ductile iron castings from scrap steel
  • Method for producing ductile iron castings from scrap steel

Examples

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Effect test

Embodiment 1

[0030] A method for producing ductile iron castings by using scrap steel, comprising the following steps, the parts involved are parts by weight: S1, first adding the first batch of carbon scrap steel to the bottom of the electric furnace, then adding 25 parts of recarburizer, and the second batch of carbon 230 parts of plain steel scrap, 230 parts of new virgin iron, 180 parts of ductile cast iron and 9 parts of ferrosilicon. The total amount of the first batch of carbon scrap and the second batch of carbon scrap is 465 parts. The weight ratio of plain steel scrap is 1:2; heating to 1340°C until it is completely melted, and checking whether the composition of molten iron is qualified, the testing standards are C 3.5-3.9 (wt%), Si 1.4-1.8 (wt%);

[0031] S2, after the melted molten iron is tested to be qualified, continue heating until the temperature of the molten iron is raised to 1530° C., pour the molten iron into a ladle containing 14 parts of ferrosilicon and 7 parts of n...

Embodiment 2

[0036] A method for producing ductile iron castings from steel scraps, comprising the following steps, the parts involved are parts by weight: S1, first adding the first batch of carbon steel scraps to the bottom of an electric furnace, then successively adding 28 parts of recarburizer, and the second batch of carbon 280 parts of plain steel scrap, newborn iron, 220 parts of nodular cast iron and 10 parts of ferrosilicon. The total amount of the first batch of carbon scrap and the second batch of carbon scrap is 600 parts. The weight ratio of plain scrap steel is 2:3; heat to 1350°C until it is completely melted, and use the molten iron composition analyzer in front of the furnace to detect whether the composition of the molten iron is qualified. The detection standards are C 3.5-3.9 (wt%), Si 1.4-1.8 (wt%) ;

[0037] S2, after the melted molten iron is tested to be qualified, continue heating until the temperature of the molten iron is raised to 1550° C., pour the molten iron...

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Abstract

The invention discloses a method for producing ductile iron castings from scrap steel. The method comprises the following steps that firstly a first batch of carbon scrap steel is added into the bottom of an electric furnace; then 25-28 parts of a carburant, a second batch of carbon scrap steel, 230-280 parts of new pig iron, 180-220 parts of recirculated iron and 9-10 parts of silicon iron are sequentially added, the total quantity of the first batch of carbon scrap steel and the second batch of carbon scrap steel is 465-600 parts, and the weight ratio of carbon scrap steel to the second batch of carbon scrap steel is (1 to 2)-(2 to 3); heating is carried out to 1340DEG C-1350DEG C until the components are completely molten; continuous heating is carried out until the temperature of the molten iron is increased to 1530DEG C-1550DEG C, discharging is carried out, the molten iron is poured into a steel ladle filled with silicon iron and spherodizing agents, and spheroidization and inoculation treatment are carried out; and after the spheroidized molten iron is detected to be qualified, the ductile iron castings are poured. According to the method for producing the ductile iron castings from the scrap steel, the large-proportion scrap steel is used for replacing pig iron to produce the ductile iron castings, and the production cost of the ductile iron castings is remarkably reduced; and meanwhile, the casting quality is excellent, and the performance is stable.

Description

technical field [0001] The invention relates to the technical field of scrap steel casting, in particular to a method for producing nodular iron castings by using scrap steel. Background technique [0002] The general method for producing nodular iron castings is to determine the corresponding ingredient list according to different nodular iron grades, such as adding 5% to 10% of scrap steel, 20% of returned iron, 70% to 75% of newborn iron, and corresponding ferrosilicon, nodular Chemicals, etc., are smelted in an intermediate frequency electric furnace. [0003] Due to the use of a large amount of new iron (its price is high), the price of ductile iron castings is relatively high. The use of a large proportion of scrap steel to produce ductile iron castings has greatly increased the difficulty of processing. It has always been a technical problem to increase the proportion of steel scrap added in the production of ductile iron castings. Contents of the invention [00...

Claims

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Application Information

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IPC IPC(8): C22C33/08C21C1/10C22C37/04C22C37/10C21C7/00
CPCC21C1/10C21C7/0025C22C33/08C22C37/04C22C37/10Y02P10/20
Inventor 李东祝戴成耀
Owner 四川青江机器股份有限公司
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