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Preparation method of low-carbon acid-resistant pipeline steel

A technology for pipeline steel and molten steel, which is applied in the direction of manufacturing converters, etc., can solve the problems that the cost and process consumption of acid-resistant pipeline steel increase a lot, and does not meet the market environment, so as to reduce RH decarburization treatment operations, cost and process consumption. Effect

Active Publication Date: 2014-03-26
SHOUGANG JINGTANG IRON & STEEL CO LTD +1
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AI Technical Summary

Problems solved by technology

The main difficulty in the production of acid-resistant pipeline steel is that the sulfur content is required to be low at the same time in the case of low carbon. The production process generally adopted at this stage is: converter-RH-LF-RH. The molten steel in the converter is mainly decarburized in the first RH. Then carry out desulfurization and composition adjustment in LF furnace, and finally enter RH again for vacuum treatment. This process will greatly increase the cost and process consumption of acid-resistant pipeline steel, which is not in line with the highly competitive market environment.

Method used

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preparation example Construction

[0024] The preparation method of a low-carbon acid-resistant pipeline steel provided by the present invention adopts the "full three removal" smelting-LF-RH process of the converter, and the specific steps include:

[0025] Step S1: pre-desulfurizing the molten iron and then performing slag removal treatment to obtain molten iron with a sulfur content of ≤0.001%;

[0026] Step S2: Smelting the molten iron with a sulfur content of ≤0.001% through a dephosphorization converter to obtain semi-liquid steel with a C content of ≥3.3%, a P content of ≤0.040%, and a T content of ≥1320°C;

[0027] Step S3: Smelting semi-liquid steel through a decarburization furnace to obtain molten steel with a C content of 0.015%-0.025%;

[0028] Step S4: After the molten steel is heated up, desulfurized, and its composition is adjusted through the LF furnace, the amount of carbon added to the molten steel is controlled to be ≤ 50ppm;

[0029] Step S5: After the molten steel whose carburization amou...

Embodiment 1

[0046] Production of low-carbon acid-resistant pipeline steel X65MS by using the converter "full three removal"-LF-RH process: the conditions for entering the semi-steel into the furnace are: C content of semi-steel 3.45%; Si content 0.016%; S content 0.0049%; P content 0.0310% ; Mn content 0.069%; molten iron temperature 1324 ℃.

[0047] When the molten iron passes through the decarburization furnace for continuous semi-steel smelting, the low carbon content in the decarburization furnace is controlled by the following steps: after blowing and missing the mixed gas, the gun position is 2.8 meters and maintained for 3-5 minutes, and the gun position is 2.5 meters for 3 minutes During this period, 350kg of fluorite was added to help the slag melt, and the slag melted in the early stage is conducive to decarburization; when the oxygen consumption is about 70%, the converter bottom blowing flow rate is increased to 1200Nm 3 / h, after the TSC is measured, the end gun position is 1...

Embodiment 2

[0054] Production of low-carbon acid-resistant pipeline steel X65MS by using the converter "full three removal"-LF-RH process: the conditions for entering the semi-steel into the furnace are: C content of semi-steel 3.55%; Si content 0.030%; S content 0.0059%; P content 0.0510% ; Mn content 0.060%; molten iron temperature 1334 ℃.

[0055] When the molten iron passes through the decarburization furnace for continuous semi-steel smelting, the low carbon content in the decarburization furnace is controlled by the following steps: after blowing and missing the mixed gas, the gun position is 2.8 meters and maintained for 3-5 minutes, and the gun position is 2.5 meters for 3 minutes During this period, 300kg of fluorite is added to help slag, and slag is good for decarburization in the early stage; when the oxygen consumption is about 70%, the converter bottom blowing flow rate is increased to 1200Nm 3 / h, after the TSC is measured, the end gun position is 1.6 meters, and it is main...

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Abstract

The invention discloses a preparation method of low-carbon acid-resistant pipeline steel. The preparation method comprises the steps of performing slag-skimming treatment on molten iron after pre-desulfurization to obtain the molten iron with the sulfur content of not more than 0.001%; smelting the molten iron with the sulfur content of not more than 0.001% by a dephosphorization converter to obtain semi-molten iron with C of not less than 3.3%, P of not more than 0.040% and T of not less than 1320 DEG C; smelting the semi-molten iron by a decarbonization furnace to obtain molten steel with the C content of 0.015%-0.025%; performing heating, desulfurization and component adjustment treatment on the molten steel by an LF (ladle furnace), and then controlling the carbon pick-up in the molten steel to be not more than 50ppm; performing deep degassing treatment on the molten steel with the carbon pick-up of not more than 50ppm by an RH refining process, and then performing continuous casting to obtain a plate blank. The preparation method of low-carbon acid-resistant pipeline steel, provided by the invention, has the advantages that the production consumption is reduced and the production cost is saved by optimizing a smelting process.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and in particular relates to a preparation method of low-carbon acid-resistant pipeline steel. Background technique [0002] With the soaring price of steel smelting raw materials, the shortage of energy materials, and the continuous innovation of smelting technology, the competition of steel enterprises is becoming increasingly fierce. In this situation, the advantage of low-cost production is particularly important. The main difficulty in the production of acid-resistant pipeline steel is that the sulfur content is required to be low at the same time in the case of low carbon. The production process generally adopted at this stage is: converter-RH-LF-RH. The molten steel in the converter is mainly decarburized in the first RH. Then carry out desulfurization and composition adjustment in LF furnace, and finally enter RH again for vacuum treatment. This process will greatly increase the cost...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C33/04C21C1/02C21C5/28C21C7/00
Inventor 田志红单庆林高圣永郭小龙王朝斌张宏艳王志鹏宋佳友边吉明周伟杨晓山王胜东
Owner SHOUGANG JINGTANG IRON & STEEL CO LTD
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