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Method for decreasing titan content in molten ductile iron

A technology for ductile iron and molten iron, which is applied in the field of reducing titanium content in molten iron, can solve the problems of poor spheroidization effect of ductile iron, tight supply, and rising prices, avoiding blindness, reducing titanium content, and being easy to operate. Effect

Inactive Publication Date: 2010-01-27
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to the current tight supply and rising prices in the pig iron market, many foundry companies cannot buy special pig iron for ductile iron that meets the quality requirements, but production will continue, and the quality of pig iron randomly purchased in the market cannot be guaranteed; the quality of ductile iron in pig iron The most sensitive sulfur content and titanium content exceeding the standard are the most common unqualified factors, and the spheroidizing effect of the ductile iron produced with this sulfur content or titanium content exceeding the standard raw material is very poor, often making the casting due to The spheroidization rate or spheroidization level does not meet the requirements and is scrapped

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The nodular cast iron molten iron melted by the induction furnace is determined to have a titanium content of 0.12% by rapid chemical analysis before the furnace, and ferrochromium nitride equivalent to 0.28% of the molten iron weight in the furnace is put into the induction furnace to make nitrogen and Titanium fully undergoes metallurgical reaction, then the molten iron is poured into the refining ladle, and refined by argon blowing, and at the same time, a slag accumulator is added in the refining ladle to fully float and remove the titanium nitride particles generated by the reaction. Then, through a chemical analysis, it is determined that the titanium content is 0.05%, and at this time, it enters the normal nodular cast iron production process such as spheroidizing inoculation treatment.

Embodiment 2

[0020] The nodular cast iron molten iron melted by cupola-induction electric furnace, the titanium content is determined to be 0.08% by rapid chemical analysis before the furnace, at this time, high-quality steel scrap equivalent to 30% of the weight of the molten iron is added to the molten iron in the induction furnace , and then smelted to dilute the original molten iron. At this time, the titanium content of the molten iron reaches the qualified range of <0.07%. After the scrap steel is completely melted, a chemical analysis is carried out to confirm that the titanium content of the molten iron is qualified, and alloys such as recarburizers are added to adjust the chemical composition of the molten iron to meet the requirements, and then enter the normal production process of nodular cast iron such as spheroidizing inoculation treatment .

Embodiment 3

[0022] A foundry company undertook the mass production task of gears for oil drilling rigs. The gear is a thick casting with high quality requirements. Spherical recession sometimes occurs in production, causing large economic losses to the enterprise. After analysis, it was determined that it was caused by excessive titanium content in molten iron. Therefore, in the future production, the titanium content in the molten iron is tested before the furnace. For example, the titanium content of a certain furnace is 0.14%. At this time, add high-quality steel scrap equivalent to 120% of the weight of the molten iron into the molten iron of the induction furnace. , so that the original molten iron is diluted, and the titanium content of the molten iron is 0.06% after re-smelting. At this time, add recarburizer and other alloys to the molten iron in the induction furnace to adjust other chemical components to pass, and then enter the normal process. Nodular cast iron production pro...

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Abstract

The invention discloses a method for reducing the titanium content in ductile iron liquid iron. Firstly, through analyzing chemical constituents in the ductile iron liquid iron, a nitride with the corresponding volume is added into the liquid iron according to the titanium content of the liquid iron if the titanium content exceeds standard, the nitrogen and titanium can have the metallurgical reaction fully, then the liquid iron is cast into a refining ladle for the refining treatment of argon gas blowing, finally the up-floating titanium nitride is eliminated, namely, the titanium content of the liquid iron reaches the qualified range. Secondly, high quality scrap steel is added into a melting furnace in proportion according to the titanium content of liquid iron, and the titanium content of liquid iron is reduced by dilution. The method utilizes the strong affinity between nitrogen and titanium to change the titanium in the liquid iron into solid titanium nitride which can float upward to the surface of the liquid iron, thereby eliminating the titanium nitride. Other elements of the nitride selected in the invention has no adverse effect on the performance of ductile iron after being added with the ductile iron liquid iron, on the contrary, can also further increase the mechanical performance indexes of ductile iron such as strength. The method for reducing the titanium content of liquid iron through adding scrap steel to dilute the liquid iron has advantages of simple process and convenient operation, and is particularly applied to the mass production.

Description

technical field [0001] The invention relates to a method for reducing the titanium content in molten iron, in particular to a method for reducing the titanium content in molten iron for ductile iron. Background technique [0002] Ductile iron is an iron-carbon alloy. Because the graphite in ductile iron is spherical, the strength of ductile iron is high, which is close to steel, and it has good casting performance. Therefore, ductile iron is widely used. Its production method is relatively simple, that is, the raw materials that meet the requirements are melted in a cupola or electric furnace to form molten iron, and then spheroidized and inoculated, and nodular cast iron is obtained after it is cooled and solidified. Although the process of producing ductile iron is relatively simple, the requirements for raw materials are relatively strict. There are many factors that affect the nodularity rate of ductile iron, such as the influence of alloying elements is one of them. A...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C1/10
CPCY02P10/20
Inventor 张忠诚王忠民魏胜辉
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY