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Stainless steel AOD converter steelmaking technology using nickel protoxide ball for direct reductive alloying

A nickel oxide ball, converter steelmaking technology, applied in the manufacture of converters and other directions, can solve the problems of high production cost and high production cost of nickel-containing stainless steel, and achieve the effects of reducing oxygen consumption, rapid reduction, and reducing dosage

Inactive Publication Date: 2016-06-01
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a stainless steel AOD converter steelmaking process using nickelous oxide balls for direct reduction alloying to solve the problem of adjusting the nickel content by adding nickel plates or nickel base materials in the AOD refining process in the prior art , the production cost of nickel-containing stainless steel is high, and the production cost of enterprises is high

Method used

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  • Stainless steel AOD converter steelmaking technology using nickel protoxide ball for direct reductive alloying
  • Stainless steel AOD converter steelmaking technology using nickel protoxide ball for direct reductive alloying
  • Stainless steel AOD converter steelmaking technology using nickel protoxide ball for direct reductive alloying

Examples

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Effect test

Embodiment 1

[0018] A stainless steel AOD converter steelmaking process using nickel oxide balls for direct reduction alloying, including the following process steps: (1) Adding molten iron: at 1500°C, by mass percentage, the chemical composition is: C: 2.0%, Si: 0.45%, Mn: 0.177%, P: 0.03%, S: 0.10%, Cr: 6.4%, Ni: 9.4% of 92t molten iron is injected into the AOD converter.

[0019] (2) Decarburization: In the decarburization process, nickel oxide balls are added to the AOD converter.

[0020] The composition of the nickel oxide balls added in this embodiment is: Ni: 68.21%, Cu: 0.187%, P: 0.004%, S: 0.473%, Si: 0.10%, C: 0.487%, the nickel oxide balls are oxidized The nickel oxide powder, organic binder, and water are uniformly stirred and then pressed into an oval ball with a size of 50mm×40mm×21mm.

[0021] The chemical composition range of the lime added in this embodiment in terms of mass percentage is CaO≥88.0%, P≤0.01%, S≤0.045%, C≤0.7%, SiO 2 ≤3.0%, activity ≥350ml, raw and overheated ≤7...

Embodiment 2

[0034] A stainless steel AOD converter steelmaking process using nickel oxide balls for direct reduction alloying, including the following process steps: (1) Adding molten iron: at 1490°C, by mass percentage, the chemical composition is: C: 1.8%, Si: 0.60%, Mn: 0.19%, P: 0.035%, S: 0.13%, Cr: 5.8%, Ni: 9.5% 87.5t molten iron is injected into the AOD converter.

[0035] (2) Decarburization: In the decarburization process, nickel oxide balls are added to the AOD converter.

[0036] The composition of the nickel oxide balls added in this embodiment is: Ni: 68.21%, Cu: 0.187%, P: 0.004%, S: 0.473%, Si: 0.10%, C: 0.487%, the nickel oxide balls are oxidized The nickel oxide powder, organic binder, and water are uniformly stirred and then pressed into an oval ball with a size of 50mm×40mm×21mm.

[0037] The chemical composition range of the lime added in this embodiment in terms of mass percentage is CaO≥88.0%, P≤0.01%, S≤0.045%, C≤0.7%, SiO 2 ≤3.0%, activity ≥350ml, raw and overheated ≤7....

Embodiment 3

[0050] A stainless steel AOD converter steelmaking process using nickel oxide balls for direct reduction alloying, including the following process steps: (1) Adding molten iron: at 1525°C, by mass percentage, the chemical composition is: C: 1.90%, Si: 0.50%, Mn: 0.17%, P: 0.034%, S: 0.12%, Cr: 5.4%, Ni: 9.7% of 90.0t molten iron is injected into the AOD converter.

[0051] (2) Decarburization: In the decarburization process, nickel oxide balls are added to the AOD converter.

[0052] The composition of the nickel oxide balls added in this embodiment is: Ni: 68.21%, Cu: 0.187%, P: 0.004%, S: 0.473%, Si: 0.10%, C: 0.487%, the nickel oxide balls are oxidized The nickel oxide powder, organic binder, and water are uniformly stirred and then pressed into an oval ball with a size of 50mm×40mm×21mm.

[0053] The chemical composition range of the lime added in this embodiment in terms of mass percentage is CaO≥88.0%, P≤0.01%, S≤0.045%, C≤0.7%, SiO 2 ≤3.0%, activity ≥350ml, raw and overheated...

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Abstract

The invention discloses a stainless steel AOD converter steelmaking technology using a nickel protoxide ball for direct reductive alloying. The stainless steel AOD converter steelmaking technology includes the technological steps of molten iron adding, decarburizing, reducing, desulfurization and the like. The stainless steel AOD converter steelmaking technology has the beneficial effects that due to the fact that the slag quantity of an AOD converter is small, the nickel protoxide ball can enter molten iron directly, the high temperature of the molten iron in the AOD converter is used for rapidly melting the nickel protoxide ball, and the decarburizing process can be smoothly completed; C, Si, Mn and other elements in the molten iron and good dynamic stirring conditions of the AOD converter are utilized, so that the nickel protoxide ball is fully reduced, the nickel protoxide ball is rapidly reduced, and the purpose of conducting direct alloying on the molten iron is achieved; oxygen provided in the nickel protoxide ball can be used in the earlier decarburizing process, and the consumption of oxygen in the smelting process is reduced; and in the molten steel alloying process, the nickel protoxide ball is used for conducting direct reductive alloying, the input volume of nickel plates or nickel base materials is reduced, the production cost of stainless steel containing nickel is reduced, and meanwhile the production cost of an enterprise is also reduced.

Description

Technical field [0001] The invention belongs to the technical field of AOD converter steelmaking, and in particular relates to a stainless steel AOD converter steelmaking process using nickel oxide balls for direct reduction alloying. Background technique [0002] The smelting process of nickel-containing stainless steel usually includes: electric furnace-AOD converter-LF refining furnace-continuous casting and other process steps. The electric furnace melts raw materials such as ferronickel and scrap steel into the AOD converter. The nickel content of the AOD converter is usually already Close to the target value, nickel plates or nickel base materials are usually added to fine-tune the nickel content in the AOD refining process. Nickel is usually extracted from nickel laterite ore. With the reduction of global nickel sulfide resources, the difficulty of refining increases, electrolytic nickel The continuous increase in the cost of nickel-containing stainless steel has caused a ...

Claims

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Application Information

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IPC IPC(8): C21C5/30C21C7/068C21C7/064C22C33/04
CPCC21C5/30C21C7/064C21C7/0685C22C33/04
Inventor 陈兴润王建新潘吉祥成东全
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD