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A method for preventing flocculation of carbon high-silicon and low-manganese steel in billet

A low-manganese steel and billet technology, which is applied in the field of steel smelting, can solve the problems that hinder the high-efficiency continuous casting of medium-carbon high-silicon and low-manganese steel, poor castability, and molten steel pollution, so as to avoid continuous casting flocculation shutdown and return The effect of molten steel accident, reduction of production cost and improvement of production efficiency

Active Publication Date: 2021-06-04
WUHU XINXING DUCTILE IRON PIPES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, because the composition design of PSB830 steel belongs to medium-carbon high-silicon and low-manganese steel, the Mn / Si of the steel itself is relatively low, about 0.6, and the castability is poor. The melting point inclusions adhere to the inner wall of the nozzle, aggravating the occurrence of nozzle flocculation blocking the nozzle, and then causing the fluctuation of the liquid steel level in the crystallizer, and even burning oxygen to maintain the pouring, which will inevitably pollute the molten steel and affect the quality of the billet. Forcing the downgrading or scrapping of abnormal billets in the process
When the nozzle is seriously blocked, it may even cause the casting machine to stop pouring
Therefore, the flocculation problem at the tundish nozzle is a major obstacle to the realization of high-efficiency continuous casting of medium-carbon high-silicon and low-manganese steel

Method used

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  • A method for preventing flocculation of carbon high-silicon and low-manganese steel in billet
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Embodiment 1

[0041] A method for preventing flocculation of medium-carbon high-silicon and low-manganese steel in a billet. The medium-carbon high-silicon and low-manganese steel is PSB830 steel, which is smelted for 3,200 tons. The tundish is planned to be 26 heats, and the casting furnace number is B1020- B1045 was smelted according to this production method, and there was no intrusive nozzle blockage in the whole casting process, and the production plan was completed. Now take the first pot of molten steel B1020 heat as an example to illustrate specific examples. The PSB830 steel B1020 heat includes the following components C0.40%, Si 1.55%, Mn 0.91%, V 0.136%, P0.015%, S 0.007%, and the balance of Fe and unavoidable impurities.

[0042] The method for preventing flocculation comprises the following operations:

[0043] 1. Converter process

[0044] 1) When the converter adopts the high-drawing point blowing method, the high-drawing carbon is poured into the steel, the tapping tempera...

Embodiment 2

[0057] A method for preventing flocculation of medium-carbon high-silicon and low-manganese steel in a billet. The medium-carbon high-silicon and low-manganese steel is PSB830 steel with a smelting output of 3,400 tons. The tundish is planned to be 28 heats, and the casting furnace number is A1241 -A1268, smelted according to this production method, there is no intrusive nozzle blockage in the whole casting process, and the production plan is completed. Now take the tail tank molten steel furnace number as A1268 as an example to illustrate the specific embodiment. The A1268 heat of the PSB830 steel is the 28th furnace of the continuous casting tank, including the following components C 0.42%, Si1.58%, Mn 0.89%, V 0.138%, P 0.018%, S 0.008%, and the balance of Fe and unavoidable impurities.

[0058] The method for preventing flocculation comprises the following operations:

[0059] 1. Converter process

[0060] 1) When the converter adopts the high-drawing point blowing metho...

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Abstract

The invention provides a method for preventing flocculation of medium-carbon high-silicon and low-manganese steel in a billet. Compared with the prior art, the method improves the castability of medium-carbon and high-silicon steel by optimizing the carbon , slag material ratio to control the oxygen content at the end point and the rapid slagging in the early stage; the LF furnace process uses a large amount of slag and high alkalinity to facilitate the deoxidation and desulfurization process, and then reasonably controls the argon blowing process of the ladle, and the appropriate argon blowing intensity setting and appropriate Prolonging the argon blowing time can promote the floating and removal of inclusions such as oxides and sulfides in the steel. Measures such as continuous casting process protection and casting can significantly reduce the occurrence of continuous casting nodules. At the same time, the present invention properly increases the casting temperature of molten steel, which can effectively avoid the flocculation blockage of the continuous casting intrusive nozzle. Through the above method, the flocculation phenomenon of the billet in the casting process of the medium-carbon high-silicon steel PSB830 is alleviated, and the stable continuous casting of multiple furnaces and mass production are realized.

Description

technical field [0001] The invention belongs to the field of steel smelting, and in particular relates to a method for preventing flocculation of carbon-high-silicon-low-manganese steel in a billet. Background technique [0002] Medium-carbon high-silicon low-manganese steel PSB830 is rolled into a straight steel bar with high strength and high dimensional accuracy. The steel bar requires a connector or anchor with an internal thread to be connected or anchored at any cross-section. It is widely used in large water conservancy projects, continuous beams and large frame structures in industrial and civil buildings, large and medium-span bridges in highways and railways, nuclear power plants and ground anchors and other projects. It has the advantages of simple connection and anchoring, strong adhesion, safe and reliable tension anchoring, and convenient construction, and it saves steel bars and reduces the area and weight of components. The construction of infrastructure suc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/12C22C33/06C21C5/28C21C7/00C21C7/06C21C7/064B22D11/22B22D11/115
CPCB22D11/115B22D11/22C21C5/28C21C7/0056C21C7/06C21C7/064C22C33/06C22C38/02C22C38/04C22C38/12
Inventor 王东兴杨伟勇张洪彪汪春梅王吾磊杨仁强
Owner WUHU XINXING DUCTILE IRON PIPES