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Production method for hardenability steel and hardenability steel

A production method and hardenability technology, applied in the field of metallurgy, can solve the problem of high Ca content and achieve the effect of promoting removal

Inactive Publication Date: 2016-06-01
SUZHOU SUXIN SPECIAL STEEL +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, the technical problem to be solved in the present invention is to overcome the defect of high Ca content in steel in the prior art, thereby providing a production method of low Ca content hardenability steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The production method of hardenable steel provided in this embodiment includes the following steps:

[0028] In the electric furnace smelting step, the C content of the tapping steel is precisely controlled to be below 0.04%. At a certain temperature, due to the constant carbon and oxygen product, when the C content is reduced, the oxygen content will be kept at a high level, which is convenient for the next step of deoxidation. Precisely control the amount of aluminum and iron in the deoxidizer, so as to control the amount of Ca element during calcium treatment of the generated aluminate;

[0029] In the refining step of the LF furnace, a special refining deoxidized slag is used, and the Ca / Al in the refining slag system used is 1.6. By precisely controlling the Ca / Al ratio, the free Ca element can be reduced;

[0030] In the refining step of the VD furnace, the bottom blowing Ar gas is adopted, and the pressure of the Ar gas is 0.20MPa. The bottom blowing argon gas is...

Embodiment 2

[0041] The production method of hardenable steel provided in this embodiment includes the following steps:

[0042] In the electric furnace smelting step, the C content of the tapped steel is precisely controlled at 0.02%. At a certain temperature, due to the constant carbon and oxygen product, when the C content is reduced, the oxygen content will be kept at a high level, which is convenient for the next step of deoxidation. Control the amount of aluminum and iron of the deoxidizer, and then control the amount of Ca element when calcium treatment is performed on the generated aluminate;

[0043] In the refining step of the LF furnace, a special refining deoxidized slag is used. The Ca / Al in the refining slag system used is 1.8. By precisely controlling the Ca / Al ratio, the free Ca element can be reduced;

[0044] In the refining step of the VD furnace, the bottom blowing Ar gas is adopted, and the pressure of the Ar gas is 0.40MPa. The bottom blowing argon gas is conducive to...

Embodiment 3

[0055] The production method of hardenable steel provided in this embodiment includes the following steps:

[0056] In the electric furnace smelting step, the C content of the tapping steel is precisely controlled at 0.025%. At a certain temperature, due to the constant carbon and oxygen product, when the C content is reduced, the oxygen content will be kept at a high level, which is convenient for the next step of deoxidation. Control the amount of aluminum and iron of the deoxidizer, and then control the amount of Ca element when calcium treatment is performed on the generated aluminate;

[0057] In the refining step of LF furnace, special refining and deoxidizing slag is used, and the Ca / Al in the refining slag system used is 1.7. By precisely controlling the Ca / Al ratio, free Ca elements can be reduced;

[0058] In the refining step of the VD furnace, the bottom blowing Ar gas is used, and the pressure of the Ar gas is 0.30MPa. The bottom blowing argon gas is conducive to ...

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PUM

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Abstract

The invention provides a production method for hardenability steel. The production method comprises the steps that 1, in the electric furnace smelting step, the tapping C content is precisely controlled to be below 0.04%, due to the fact that the carbon-oxygen equilibrium is constant at a certain temperature, after the C content is reduced, the oxygen content is kept to be at a high level, precise controlling over the using amount of ferroaluminum of a deoxidizing agent is facilitated during deoxidizing at the next step, and then the quantity of a Ca element can be controlled during calcium treatment on generated aluminate; 2, in the LF furnace refining step, special refining deoxidizing slag is adopted, the ratio of the Ca to Al in the adopted refining slag system is 1.6-1.8, and the free Ca element can be reduced by precisely controlling the ratio of the Ca to the Al; 3, in the VD refining step, bottom blowing of Ar gas is adopted, the pressure of the Ar gas is 0.20-0.40 MPa, floating of inclusion is facilitated through bottom blowing of the Ar gas, and calcium compounds are promoted to be removed from molten steel; and 4, in the continuous casting step, the superheat degree is controlled to be within 30 degrees in the casting process, and floating of the calcium compounds in the molten steel is facilitated through the low superheat degree.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a production method of hardenable steel and hardenable steel. Background technique [0002] Ca element is an essential element in the steelmaking process. [0003] The calcium element in molten steel has the following functions: (1) Deoxidation: calcium and oxygen have a strong affinity, and can be used for deep deoxidation during refining. (2) Desulfurization: Calcium and sulfur also have a strong affinity. When the molten steel is further desulfurized, the injected CaSi powder first reacts with the oxygen in the steel, and then reacts with the sulfur. At the same time, the pretreatment and desulfurization of molten iron often adopts the powder spraying method, using CaC 2 Or CaO-based slag powder for injection desulfurization. (3) Control the morphology of non-metallic inclusions: In steel deoxidized with aluminum, Al 2 O 3 The inclusions are cluster-like, with a high m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/52C21C7/076C21C7/10C21C7/072B22D11/115B22D11/111B22D11/18C21D8/00
CPCB22D11/111B22D11/115B22D11/18C21C5/52C21C7/072C21C7/076C21C7/10C21D8/00Y02P10/20
Inventor 乔晓阳
Owner SUZHOU SUXIN SPECIAL STEEL
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