Rare earth adding control method for high-strength rare earth girder steel

A control method and rare earth technology, applied in the direction of manufacturing converters, etc., can solve the problems of complicated operation of rare earth wire feeding method, poor stability of rare earth addition, low yield, etc. The effect of improving cleanliness

Inactive Publication Date: 2021-01-15
BAOTOU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ladle method and vacuum VD addition method, the stability of rare earth addition is poor, and the yield is low
Rare earth wire feeding method is complex in operation and high in cost

Method used

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  • Rare earth adding control method for high-strength rare earth girder steel
  • Rare earth adding control method for high-strength rare earth girder steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: Implementation case of adding rare earths to BT700L, a high-strength beam steel with rare earths

[0022] A method for controlling the addition of rare earth to high-strength rare earth girder steel, comprising:

[0023] After KR is treated by deep desulfurization process, the sulfur content of molten iron is 0.001%, which meets the requirements of molten iron. The carbon content at the end point of the converter is controlled above 0.03%, and the oxygen content at the end point is low, so as to avoid overoxidation of molten steel and reduce oxidative inclusions in molten steel. The end point temperature is controlled within the range of 1623°C to 1638°C.

[0024] The purpose of refining is mainly to desulfurize and deoxidize, remove inclusions in steel, and ensure the cleanliness of molten steel. The LF furnace quickly produces white slag, ensures the alkalinity of molten steel, and reduces the oxidation of slag, which is conducive to rapid deoxidation and...

Embodiment 2

[0030] Example 2: Rare earth high strength beam steel BT610L added rare earth implementation case

[0031] A method for controlling the addition of rare earth to high-strength rare earth girder steel, comprising:

[0032] After KR is treated by deep desulfurization process, the sulfur content of molten iron entering the furnace is within 0.002%, which meets the requirements of molten iron entering the furnace. The carbon content at the end point of the converter is controlled above 0.03%, and the oxygen content at the end point is low, so as to avoid overoxidation of molten steel and reduce oxidative inclusions in molten steel. The end point temperature is controlled within the range of 1631-1649°C.

[0033] The purpose of refining is mainly to desulfurize and deoxidize, remove inclusions in steel, and ensure the cleanliness of molten steel. The LF furnace quickly produces white slag, ensures the alkalinity of molten steel, and reduces the oxidation of slag, which is conduci...

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Abstract

The invention discloses a rare earth adding control method for high-strength rare earth girder steel. The cleanliness of molten steel of rare earth high-strength girder steel and the yield of rare earth in the steel is improved by optimizing the steel-making process. In early-stage rare earth steel research, due to the fact that the key control processes such as a rare earth adding mode, adding time and the like are not completely mastered, the yield of rare earth is low and is about 35%; and meanwhile, the number of rare earth composite inclusions in steel is large, and the continuous castingpourability of a casting machine is poor. In order to increase the yield of the rare earth, the cleanliness of molten steel is guaranteed before the rare earth is added, and the component uniformityof the rare earth in the molten steel is guaranteed after the rare earth is added. Meanwhile, protective pouring is conducted in the casting process of a casting machine, secondary oxidation of the molten steel is prevented, and the yield of the rare earth in the steel can be remarkably increased.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy and steelmaking technology, in particular to a method for controlling the addition of rare earth to high-strength rare earth girder steel. The rare earth alloy is added to molten steel through the RH furnace vacuum system to increase the yield of rare earth in the steel. Background technique [0002] Early studies mainly added rare earth elements in the steelmaking furnace or during the tapping of molten steel. The main function of rare earth elements is deoxidation and desulfurization, and the yield of rare earth elements is low. After that, the addition of rare earths is mainly concentrated in the ladle or tundish. Before the addition, the molten steel is deoxidized and desulfurized, and the rare earths are used to denature the inclusions in the molten steel. [0003] There are many ways to add rare earth in steel, including ladle adding method, rare earth wire feeding method, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/00C21C7/06C21C7/064C21C7/10C21C1/02C21C5/30
CPCC21C1/02C21C5/30C21C7/0006C21C7/06C21C7/064C21C7/10
Inventor 张嘉华刘妍王皓郭靖宿成段云波魏晓东贾生建
Owner BAOTOU IRON & STEEL GRP
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