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Tellurium-sulfur co-treated aluminum deoxidized steel as well as preparation method and application thereof

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: 2022-01-11
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Tellurium-sulfur co-treated aluminum deoxidized steel as well as preparation method and application thereof
  • Tellurium-sulfur co-treated aluminum deoxidized steel as well as preparation method and application thereof
  • Tellurium-sulfur co-treated aluminum deoxidized steel as well as preparation method and application thereof

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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 invention provides tellurium-sulfur co-treated aluminum deoxidized steel as well as a preparation method and application thereof, and relates to the field of metal materials. The tellurium-sulfur co-treated aluminum deoxidized steel comprises the following components of, in percentage by weight, 0.06%-0.09% of C, 0.01%-0.02% of Al, 0.01%-0.03% of Si, 1.0%-1.5% of Mn, 0.08%-0.1% of S, 0.045%-0.055% of P and 0.04%-0.15% of Te. The preparation method of the tellurium-sulfur co-treated aluminum deoxidized steel comprises the following steps that converter smelting is carried out on molten iron, and deoxidizing and alloying are carried out in a tapping process; and LF refining is carried out, a sulfur-iron alloy and a tellurium wire are added, and then continuous casting is carried out to obtain the tellurium-sulfur co-treated aluminum deoxidized steel. The tellurium-sulfur co-treated aluminum deoxidized steel is used as bearing steel, steel rail steel or wheel steel. According to the tellurium-sulfur co-treated aluminum deoxidized steel provided by the invention, aggregation and growth of aluminum oxide are limited, the cutting lubricity is improved, and the problem of nozzle clogging is avoided.

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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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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