Method for preventing flocculation flow of small square billet medium-carbon high-silicon low-manganese steel

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 improper production technology, so as to avoid continuous casting flocculation shutdown and The effect of returning molten steel accidents, reducing flocculation, and reducing production costs

Active Publication Date: 2020-04-21
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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  • Method for preventing flocculation flow of small square billet medium-carbon high-silicon low-manganese steel
  • Method for preventing flocculation flow of small square billet medium-carbon high-silicon low-manganese steel

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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 the flocculation flow of small square billet medium-carbon high-silicon low-manganese steel. Compared with the prior art, the method has the advantages that in order to improve the castability of the medium-carbon high-silicon steel, an end-point oxygen content and early-stage rapid slagging are controlled by optimizing end-point carbon and slag charge ratio of converter tapping, in a LF furnace process, large slag amount and high alkalinity are adopted to facilitate the deoxidation and desulfurization process, then a ladle argon blowing process is reasonably controlled, the argon blowing strength is properly set, the argon blowing time is properly prolonged, the floating and removal of oxide, sulfide and other inclusions in steel can be promoted, and the continuous casting nodulation can be obviously reduced through measures such as continuous casting process protection casting. Meanwhile, the molten steel casting temperature is properlyincreased, and the flocculation flow blockage phenomenon of a continuous casting intrusive water nozzle can be effectively avoided. By means of the method, the flocculation flow phenomenon of a smallsquare billet in the medium-carbon high-silicon steel PSB830 pouring process is reduced, and the multi-furnace stable continuous pouring and batch production are achieved.

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 Applications(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
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