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Ultrahigh-phosphorus molten iron low-cost smelting method for polar region steel

A smelting method and a low-cost technology, applied in the field of iron and steel metallurgy, can solve the problems of unfavorable batch industrial production and long LF refining process, and achieve the effects of saving raw material consumption, reducing the return of molten steel to P, and broadening the prospects for promotion

Active Publication Date: 2021-08-31
LAIWU STEEL YINSHAN SECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this smelting method does not describe the converter smelting process in detail, and the P content in the LF furnace in-place molten steel is at a low level, and the LF refining process takes too long, which is not conducive to high-efficiency and low-cost mass industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] A method for smelting low-phosphorus steel with ultra-high phosphorus hot metal for polar steel:

[0056] (1) Converter smelting

[0057] A 140t top-bottom combined blowing converter is used, and the raw material composition is: 141t of high-phosphorus desulfurization hot metal (C: 5.65%, Mn: 0.213%, P: 0.151%, S: 0.002%, Si: 0.54%, A S : 0.0020%, molten iron temperature 1310 ℃), scrap consumption is 10t. The double slag process is used for smelting. During the smelting, the oxygen is first lowered and blown, and the gun position is controlled at about 1500mm. After the oxygen lance is ignited, the flow rate of the oxygen lance is adjusted to 25000m 3 About / h, gun position at 1800mm, add lime 3050kg, sinter 3600kg, dolomite 400kg, the first batch of materials is added 150s before blowing. Lift the gun to dump the slag 30 seconds after the initial slag has melted through, and the timing of lifting the gun is in principle about 5 minutes.

[0058] Switch to oxygen af...

Embodiment 2

[0070] A method for smelting low-phosphorus steel with ultra-high phosphorus hot metal for polar steel:

[0071] (1) Converter smelting

[0072] A 140t top-bottom combined blowing converter is used, and the raw material composition is: high-phosphorus desulfurization hot metal 92% (C: 4.437%, Mn: 0.213%, P: 0.148%, S: 0.003%, Si: 0.294%, A S: 0.0018%, molten iron temperature 1316 ℃), the balance is steel scrap. The single slag process is adopted during smelting, and the oxygen lance is controlled at about 1500mm when the oxygen lance is blown; after the oxygen lance is ignited, the flow rate of the oxygen lance is adjusted to 26000m 3 / h or so, the gun position is at 1800mm, the oxygen supply pressure is 0.8MPa; 8 minutes before smelting, nitrogen is blown at the bottom, and the flow rate of nitrogen blowing at the bottom is 560m 3 / h, then increased to 880m 3 / h, switch to argon after 8 minutes of bottom blowing, and increase the flow rate to 1200m 3 / h, add 6200kg of sin...

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Abstract

The invention discloses an ultrahigh-phosphorus molten iron low-cost smelting method for polar region steel. The method sequentially comprises the following steps of a converter smelting step of smelting raw materials including molten iron, deoxidizing and tapping and alloying; an LF refining step of performing slag adjusting and refining on molten steel obtained in the converter smelting step, to obtain refined molten steel; an RH degassing step of performing vacuum degassing on the refined molten steel; and a continuous casting step of performing continuous casting on the molten steel obtained after the RH degassing step, to obtain a casting blank. According to the method, single and double slag area smelting is performed according to the content of Si in the molten iron, and thus consumption of the smelting raw materials is greatly reduced, the smelting period is shortened, and the production process is accelerated.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and relates to a method for smelting low-phosphorus steel with ultra-high-phosphorus hot metal for polar steel. Background technique [0002] With the increasing shortage of energy in the world, countries have successively increased their efforts in the development of polar oil and gas energy and built many offshore platforms, and the demand for ultra-low temperature resistant steel for polar regions has soared. Due to the extremely low temperature in the polar region, the phosphorus content in steel is crucial to the toughness of steel. However, at present, the phosphorus content of domestic molten iron varies greatly. Some steel plants are affected by ore raw materials, and the ultra-high phosphorus molten iron produced is not suitable for the production of low phosphorus steel. This seriously slowed down the pace of production. As users' demand for low-phosphorus high-quality steel co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06C21C7/064C21C7/072C21C7/10C21C5/36C21C7/00
CPCC21C7/06C21C7/10C21C7/064C21C7/072C21C7/0006C21C7/0056C21C5/36Y02P10/20C22C38/002C22C38/02C22C38/04C22C38/12C22C38/14C22C38/06C21C7/0075C21C5/34C21C7/0087C21C2007/0093
Inventor 麻衡何康王中学王腾飞邹稳蓬杜传治陈爱娇张佩宁伟霍孝新
Owner LAIWU STEEL YINSHAN SECTION CO LTD
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