Aluminum deoxidized steel with tellurium-sulfur synergistic treatment and its preparation method and application

A technology of synergistic processing and aluminum deoxidation, applied in the manufacture of converters, etc., can solve the problem of not considering the high melting point and achieve good cutting performance

Active Publication Date: 2022-03-11
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

[0005] Patent document CN113186371A discloses a method for purifying molten steel of aluminum-deoxidized steel. The patent document mainly purifies the molten steel by adding aluminum-calcium-magnesium and magnesium-cerium alloy rods to the molten steel, so that the inclusions remaining in the molten steel are fine , dispersed distribution, but did not consider the problem of high melting point caused by too high magnesium content

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  • Aluminum deoxidized steel with tellurium-sulfur synergistic treatment and its preparation method and application
  • Aluminum deoxidized steel with tellurium-sulfur synergistic treatment and its preparation method and application
  • Aluminum deoxidized steel with tellurium-sulfur synergistic treatment and its preparation method and application

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preparation example Construction

[0056] The present application also provides a method for preparing the aluminum-deoxidized steel with tellurium-sulfur synergistic treatment, including:

[0057] The molten iron is smelted in a converter, and deoxidation and alloying are carried out during the tapping process;

[0058] Perform LF refining, add sulfur-iron alloy and tellurium wire, and then continuously cast to obtain the aluminum deoxidized steel with the tellurium-sulfur synergistic treatment.

[0059] In an optional embodiment, the molten iron is not subjected to pre-desulfurization treatment before converter smelting;

[0060] The molten iron is not pre-desulfurized to ensure that the molten steel has a higher sulfur content after converter smelting.

[0061] In an optional embodiment, the molten iron is pre-desiliconized and pre-dephosphorized before being smelted in a converter. This operation can reduce the consumption of dephosphorization treatment agent, and control the phosphorus content into the c...

Embodiment 1

[0091] This example provides an aluminum deoxidized steel with tellurium-sulfur synergistic treatment, its main components (wt%) are: C: 0.063%, Al: 0.015%, Si: 0.015%, Mn: 1.2%, S: 0.09%, P: 0.045%, Te: 0.045%, and the rest are Fe and unavoidable impurity elements. Among them, ω[Te] / ω[S]=0.5.

[0092] This embodiment provides a method for preparing aluminum-deoxidized steel with tellurium-sulfur synergistic treatment. The smelting process used in this aluminum deoxidized steel: converter → LF → continuous casting.

[0093] Converter smelting: The molten iron is not pre-desulfurized to ensure a higher sulfur content in the molten steel after converter smelting. The molten iron before entering the converter is pre-desiliconized and then pre-dephosphorized, and the phosphorus content of the molten steel for tapping is 0.045wt%. The molten steel is deoxidized and alloyed by tapping the converter, and the carbon content at the end of the converter is 0.035wt%. Add 3.0kg / t of a...

Embodiment 2

[0097]This example provides an aluminum deoxidized steel with tellurium-sulfur synergistic treatment, its main components (wt%) are: C: 0.063%, Al: 0.015%, Si: 0.015%, Mn: 1.2%, S: 0.09%, P: 0.045%, Te: 0.09%, and the rest are Fe and unavoidable impurity elements. Among them, ω[Te] / ω[S]=1.

[0098] This embodiment provides a method for preparing aluminum-deoxidized steel with tellurium-sulfur synergistic treatment.

[0099] The smelting process used in this aluminum deoxidized steel: converter → LF → continuous casting.

[0100] Converter smelting: The molten iron is not pre-desulfurized to ensure a higher sulfur content in the molten steel after converter smelting. The molten iron before entering the converter is pre-desiliconized and then pre-dephosphorized, and the phosphorus content of the molten steel for tapping is 0.045wt%. The molten steel is deoxidized and alloyed by tapping the converter, and the carbon content is adjusted to 0.035wt% at the end of the converter. ...

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Abstract

The present application provides an aluminum-deoxidized steel with tellurium-sulfur synergistic treatment and its preparation method and application, relating to the field of metal materials. Aluminum deoxidized steel with tellurium-sulfur synergistic treatment: C0.06%-0.09%, Al0.01%-0.02%, Si0.01%-0.03%, Mn1.0%-1.5%, S0.08%-0.1%, P0.045%‑0.055%, Te0.04%‑0.15%. The preparation method comprises: carrying out converter smelting of molten iron, carrying out deoxidation alloying in the steel tapping process; carrying out LF refining, adding sulfur-iron alloy and tellurium wire, and then continuously casting to obtain aluminum deoxidized steel with tellurium-sulfur synergistic treatment. Application of tellurium-sulfur co-processed aluminum-deoxidized steels as bearing steels, rail steels or wheel steels. The aluminum-deoxidized steel provided by the present application for the synergistic treatment of tellurium-sulfur limits the aggregation and growth of alumina, increases the cutting lubricity, and avoids the problem of nozzle nodules.

Description

technical field [0001] The present application relates to the field of metal materials, in particular to an aluminum deoxidized steel with tellurium-sulfur synergistic treatment and its preparation method and application. Background technique [0002] Aluminum deoxidized steel is widely used because of its high strength and good impact properties. However, the increase of non-metallic inclusions in steel will reduce the cleanliness of steel, destroy the continuity of steel and reduce its mechanical properties. Alumina is a typical inclusion in aluminum deoxidized steel. Alumina inclusions are easy to accumulate and adhere to the inner wall of the submerged nozzle, changing the internal shape of the nozzle, causing the steel flow to drift and the impact velocity to be too high. Calcium treatment of deoxidized steel can reduce the occurrence of nozzle nodules, but the amount of calcium added should be moderate, otherwise large-sized inclusions will easily occur. If sulfur is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/06C22C38/02C22C38/04C22C38/60C21C7/00C21C7/06C21C5/28C22C33/06B22D11/111B22D11/115B22D11/22
CPCC22C38/06C22C38/02C22C38/04C22C38/60C22C38/002C21C7/0006C21C7/06C21C5/28C22C33/06B22D11/111B22D11/115B22D11/22B22D11/225
Inventor 刘威杨树峰车智超李京社宋朝琦刘宇航
Owner UNIV OF SCI & TECH BEIJING
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