Smelting process for producing ultra-low phosphorous steel by converter

An ultra-low phosphorus steel and process technology, applied in the manufacture of converters and other directions, can solve the problems of large physical heat loss of molten iron, low molten iron temperature, and large energy waste, and achieve high added value of products, low alloy consumption, and energy saving. Effect

Inactive Publication Date: 2010-12-08
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, relevant manufacturers at home and abroad are using three desiliconization (desiliconization, descaling, desulfurization) of molten iron + double converter (one converter dephosphorization, another converter decarburization) to produce ultra-low phosphorus steel. The disadvantage of this production process is: molten iron Low temperature, large physical heat loss of molten iron, high alloy consumption, long smelting cycle, large energy waste, low output, high production cost

Method used

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Effect test

Embodiment 1

[0014] A smelting process for ultra-low-phosphorus steel produced by a converter according to the present invention, the process produces ultra-low-phosphorus steel through the smelting process of twice slagging the molten iron after desulfurization once, and the specific steps are:

[0015] The molten iron after one desulfurization is dephosphorized by the slag blowing method in the early stage and the later stage, and the slag is adjusted by ferrosilicon. 1450°C; the temperature measured by the sub-lance at 80% blowing is 1540°C; the target end point temperature is 1620°C, and an ultra-low phosphorus steel with a phosphorus content within 0.005% by mass is obtained.

Embodiment 2

[0017] Yet another smelting process for ultra-low-phosphorus steel produced by a converter according to the present invention, the process produces ultra-low-phosphorus steel through the smelting process of twice desulphurized molten iron in the converter, and the specific steps are:

[0018] The molten iron after one desulfurization is dephosphorized by the slag blowing method in the early stage and the later stage, and the slag is adjusted by ferrosilicon. 1450°C; the temperature measured by the sub-lance at 80% blowing is 1550°C; the target end point temperature is 1630°C, and an ultra-low phosphorus steel with a phosphorus content within 0.005% by mass is obtained.

Embodiment 3

[0020] Another smelting process for ultra-low phosphorous steel produced by converters. In this process, molten iron after primary desulfurization is produced through the smelting process of converter slag three times to produce ultra-low phosphorous steel. The specific steps are:

[0021] Dephosphorize the molten iron after one desulfurization by using the slag blowing method in the early, middle and late stages, adjust the slag with ferrosilicon, fill the slag basin every time, and control the process temperature: the target temperature in the early stage is 1380 ℃, the maximum temperature ≤1450°C; the temperature measured by the sub-lance at 80% blowing is 1540°C; the target end point temperature is 1620°C, and an ultra-low phosphorus steel with a phosphorus content within 0.005% by mass can be obtained.

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Abstract

The invention discloses a smelting process for producing ultra-low phosphorous steel by a converter. In the process, molten iron subjected to primary desulfurization is subjected to a multiple slagging smelting process through the converter to produce the ultra-low phosphorous steel. The process comprises the following steps of: removing phosphorus from the molten iron subjected to primary desulfurization by adopting a deslagging and blowing method at the early stage and the later stage twice, adjusting slag by using silicon iron, pouring into a slag pot to make the slat pot full each time, and well controlling the process temperature: the target temperature at the early stage is between 1,350 and 1,400 DEG C, the highest temperature is less than or equal to 1,450 DEG C, the temperature measured when a sublance blows 80 percent of the steel is between 1,530 and 1,550 DEG C and the target terminal temperature is between 1,610 and 1,630 DEG C to obtain the ultra-low phosphorous steel with less than or equal to 0.005 mass percent of phosphorous. The molten iron subjected to primary desulfurization is subjected to multiple deslagging through the converter to produce the ultra-low phosphorous steel, and the process has the advantages of small physical heat loss of the molten iron, high yield, high efficiency, low alloy consumption, low cost and energy conservation.

Description

technical field [0001] The invention relates to a smelting process for ultra-low phosphorus steel, in particular to a smelting process for producing ultra-low phosphorus steel by a double-slag or multi-slag method in a converter. Background technique [0002] At present, relevant manufacturers at home and abroad are using three desiliconization (desiliconization, descaling, desulphurization) of molten iron + double converter (one converter dephosphorization, another converter decarburization) to produce ultra-low phosphorus steel. The disadvantage of this production process is: molten iron Low temperature, large physical heat loss of molten iron, high alloy consumption, long smelting cycle, large energy waste, low output and high production cost. Contents of the invention [0003] In order to overcome the problems existing in the prior art, the object of the present invention is to provide a smelting process for ultra-low phosphorus steel produced by a converter. The heat...

Claims

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Application Information

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IPC IPC(8): C21C5/28
Inventor 黄一新姚永宽蔡可森霍松波林国强耿建林孟令东王春芳樊振亚温永红黄建华张清辉
Owner NANJING IRON & STEEL CO LTD
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