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 pr

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0013] Example 1

[0014] A converter production ultra-low phosphorous steel smelting process according to the present invention, the process uses the molten iron after desulfurization once to produce ultra-low phosphorous steel through a converter slagging process twice, and the specific steps are:

[0015] The molten iron after the first desulfurization is dephosphorized by the two slag blowing methods in the early and late stages, and ferrosilicon is used to adjust the slag, and the slag basin is filled each time, and the process temperature is controlled: the target temperature in the early stage is 1380℃, and the maximum temperature is ≤ 1450°C; the temperature measured by the sub-lance at 80% blowing is 1540°C; the target end temperature is 1620°C to obtain ultra-low phosphorous steel with a phosphorus content of 0.005% by mass.

Example Embodiment

[0016] Example 2

[0017] Another smelting process for producing ultra-low phosphorous steel in a converter according to the present invention is to produce ultra-low phosphorous steel through a smelting process of twice slagging in the converter from molten iron after desulfurization once. The specific steps are as follows:

[0018] The molten iron after the first desulfurization is dephosphorized by the two slag blowing methods in the early and late stages, and ferrosilicon is used to adjust the slag. The slag basin is filled each time, and the process temperature is controlled: the target temperature in the early stage is 1400 ℃, and the maximum temperature ≤ 1450°C; the temperature measured by the sub-lance at 80% blowing is 1550°C; the target end temperature is 1630°C to obtain ultra-low phosphorous steel with a phosphorus content within 0.005% by mass.

Example Embodiment

[0019] Example 3

[0020] Another converter production ultra-low phosphorous steel smelting process, this process uses the molten iron after desulfurization once to produce ultra-low phosphorous steel through a converter three-time slagging process. The specific steps are:

[0021] The molten iron after desulfurization is dephosphorized by the three-step slag blowing method in the early, middle and late stages, and ferrosilicon is used to adjust the slag. The slag basin is filled each time and the process temperature is controlled: the target temperature in the early stage is 1380℃, the highest temperature ≤1450℃; the temperature measured by the sub-lance at 80% blowing is 1540℃; the target end temperature is 1620℃, and the ultra-low phosphorous steel with the mass percentage of phosphorus within 0.005% is 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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