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Complex additive for spheroidizing and dispersing sulfides in steel and use method thereof

A compound additive and dispersion technology, applied in the field of smelting, can solve the problems of complex adding methods, high bismuth price, and uneconomical additives, etc., and achieve the effects of good processing performance, short process time, and high component hit rate

Active Publication Date: 2012-11-28
WUHAN UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0026] Due to the high price of bismuth, it is not economical as an additive to improve machinability
In addition, the most effective way to add bismuth to steel is to spray bismuth pellets into the molten steel flow, and the addition method is more complicated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A composite additive for spheroidizing and dispersing sulfides in steel and its application method. The chemical composition and content of the composite additive are: Si is 30-50wt%, Ca is 10-15wt%, Ti is 13-25wt%, Zr is 20-25wt%, Nd is 15-35wt%, and the rest is Fe and unavoidable impurities.

[0037] The preparation method of the composite additive is as follows: according to the above composition, based on the Si-Ca alloy, adding Ti, Zr and Nd; melting and casting in a vacuum induction furnace.

[0038] The process of deoxidation and composite composite alloying in this embodiment is: use a converter or an electric arc furnace to refine the molten iron after steelmaking and adjust the composition of the molten steel, keep the oxygen content in the molten steel at 10-120ppm before adding the composite additive, and then use The composite additives are deoxidized and composite alloyed. The composite additives are added to the molten steel in the form of block alloys, ...

Embodiment 2

[0043] A composite additive for spheroidizing and dispersing sulfides in steel and its application method. The chemical composition and content of the composite additive are: Si is 35-60wt%, Ca is 7-12wt%, Ti is 5-14wt%, Zr is 12-20wt%, Nd is 10-20wt%, and the rest is Fe and unavoidable impurities.

[0044] The preparation method of the composite additive is as follows: according to the above composition, based on the Si-Ca alloy, adding Ti, Zr and Nd; melting and casting in a vacuum induction furnace.

[0045] The process of deoxidation and alloying in this embodiment is: use electric arc furnace to refine steel scrap after steelmaking and adjust the composition of molten steel, keep the oxygen content in molten steel at 120-200ppm before adding composite additives, and then use composite additives for deoxidation Alloying with composite, the composite additive is added into molten steel in the form of block alloy, the addition amount is 1-3kg per ton of steel, and finally c...

Embodiment 3

[0050] A composite additive for spheroidizing and dispersing sulfides in steel and its application method. The chemical composition and content of the composite additive are: Si is 40-65wt%, Ca is 5-10wt%, Ti is 5-15wt%, Zr is 13-35wt%, Nd is 10-30wt%, and the rest is Fe and unavoidable impurities.

[0051] The preparation method of the composite additive is as follows: according to the above composition, based on the Si-Ca alloy, adding Ti, Zr and Nd, melting and casting in a vacuum induction furnace.

[0052] The process of deoxidation and composite alloying in this embodiment is: use a converter to refine molten iron and scrap steel after steelmaking and adjust the composition of molten steel, keep the oxygen content in molten steel at 150-300ppm before adding composite additives, and then use composite additives Deoxidation and composite alloying are carried out, and composite additives are added to the molten steel in the form of cored wires, the addition amount is 2.5-5...

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Abstract

The invention relates to a complex additive for spheroidizing and dispersing sulfides in steel and a use method thereof. The invention adopts the technical scheme that the complex additive comprises the following chemical components in percentage by weight: 30-65wt% of Si, 5-15wt% of Ca, 5-25wt% of Ti, 10-35wt% of Zr, 10-35wt% of Nd and the balance Fe and inevitable impurities. The complex additive is prepared by adding Ti, Zr and Nd on the basis of Si-Ca alloy according to the components by smelting and casting in a vacuum induction furnace. The use method of the complex additive comprises the following steps: before the complex additive is added, keeping the content of the free oxygen in molten steel to be 10-300ppm, then carrying out deoxidization and complex alloying by the complex additive, and adding the complex additive into the molten steel in a form of blocky alloy or core-spun yarn, wherein the additive amount is 0.5-5kg per ton of steel. The invention has the characteristics of low cost, simple technical process and high component hit rate. The steel which is rolled after being smelted by the complex additive has good toughness, processing performance and cutting performance.

Description

technical field [0001] The invention belongs to the technical field of smelting. In particular, it relates to a compound additive used for spheroidizing and dispersing sulfide in steel and its application method. Background technique [0002] As is well known, elements that improve the machinability of steel include S, Pb, Se, Te, Bi, Ca, Ti, and the like. The earliest developed is free-cutting steel with added sulfur. The United States began to use it for auto parts in 1920, and in Japan around 1940, this steel grade appeared in the JES standard and was included in the JIS standard in 1952. Sulfur-containing free-cutting steels and composite free-cutting steels of S, P, N, Pb and other elements are collectively called sulfur-based free-cutting steels, which can be divided into sulfur-based free-cutting steels that focus on machinability and sulfur-containing compound-based free-cutting steels. ; Sulfur-based free-cutting steel for mechanical structures with emphasis on m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/04C22C28/00C22C30/00
Inventor 吴开明王博韩文习李广艳吕霞王学新张佩王红鸿万响亮黄刚魏然张莉芹
Owner WUHAN UNIV OF SCI & TECH
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