Method for single slag smelting low-carbon high-phosphorus and high-weathering steel by adopting combined blown converter

A technology with high weather resistance, high carbon and high phosphorus, applied in the direction of manufacturing converters, improving process efficiency, etc., can solve the problems of insufficient phosphorus retention, de-P, and rising, so as to save procurement costs, reduce energy losses, and reduce The effect of blown damage

Inactive Publication Date: 2015-09-23
ANYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. There are certain safety risks in smelting high-silicon molten iron in converter slag operation
[0006]2. The simple strong carbon drawing operation will easily cause the increase of FeO and γP2O5 in the slag, which will cause further P removal
[0007]3. There is no description of the specific process application parameters on the control principle of decarbonization and phosphorus conservation from the converter
[0008]4. The P content at the end point of the converter can only be guaranteed at 0.03-0.06%, and the phosphorus retention effect is not obvious enough

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The Q355GNH high-phosphorus and high-weathering structural steel is smelted by double-blowing converter single slag, and the smelting method of the Q355GNH high-phosphorus and high-weathering steel comprises the following steps:

[0030] Step 1: Check the composition of the molten iron into the furnace: Si 0.56%, P 0.123%, temperature 1348°C; load 163t of molten iron, 13t of scrap steel, and add copper and nickel plates together with the scrap;

[0031] Step 2: Do not add any slagging material in the initial stage of converter smelting, and ensure that the oxygen supply intensity is 2.9~3.3Nm 3 / (t min), reduce the converter gun position as soon as possible under the premise of ensuring safety, rapidly increase the smelting temperature with the oxidation of silicon, control the temperature of the smelting process to not be lower than 1600°C, quickly realize the C-O decarburization reaction, and inhibit the dephosphorization reaction ;

[0032] The third step: during th...

Embodiment 2

[0038] Smelting SPA-H high-phosphorus weather-resistant container steel by adopting double-blown converter single slag, the smelting method of the described SPA-H high-phosphorus weather-resistant container steel comprises the following steps:

[0039] Step 1: Check the composition of the molten iron: Si 0.38%, P 0.111%, temperature 1310°C; due to the low initial silicon content and low temperature of the molten iron, adjust the amount appropriately, 165t of molten iron, 7.7% of scrap steel t, copper plate and nickel plate are added together with scrap steel at one time;

[0040] Step 2: Do not add any slagging material when the converter starts blowing, and moderately lower the gun position to ensure that the oxygen supply intensity is 3.1~3.5Nm 3 / (t min), quickly increase the smelting temperature, control the temperature of the smelting process to not be lower than 1600°C, quickly realize the C-O decarburization reaction, and inhibit the dephosphorization reaction;

[0041...

Embodiment 3

[0047] 09CuPCrNi high-phosphorus atmospheric corrosion-resistant steel is smelted by double-blowing converter single slag, and the smelting method of the 09CuPCrNi high-phosphorus atmospheric corrosion-resistant steel comprises the following steps:

[0048] Step 1: Check the composition of the molten iron into the furnace: Si 0.69%, P 0.131%, temperature 1367°C; load 161t of molten iron, 13.3t of scrap steel, and add copper and nickel plates together with the scrap;

[0049] Step 2: Do not add any slagging material when the converter starts blowing, and ensure that the oxygen supply intensity is 2.9~3.3Nm 3 / (t min), moderately lower the gun position, pay attention to the rapid oxidation of silicon, the smelting temperature rises rapidly to above 1600°C, realize the oxidation reaction of C-O in the middle and later stages of silicon oxidation, and effectively inhibit the dephosphorization reaction;

[0050] Step 3: During the smelting process, the initial silicon content of mo...

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PUM

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Abstract

The invention relates to a production method for high-phosphorus and high-weathering series steel of the technical field of metallurgy and steelmaking, in particular to a method for single slag smelting low-carbon high-phosphorus and high-weathering steel by adopting a combined blown converter. According to the method, based on the improvement of a conventional converter steelmaking operation technology, by combining the requirement of decay resistance performance of high-weathering steel, the process smelting temperature of the converter is improved, the consumption of auxiliary materials and phosphorous-iron alloy of the converter is reduced, the losses in the blowing process of the converter are reduced, the content of TFe of converter final slags is reduced, and the content of phosphorus of a converter terminal is improved.

Description

technical field [0001] The invention relates to a production method of high-phosphorus weather-resistant series steel in the technical field of metallurgy and steelmaking, in particular to a method for smelting low-carbon, high-phosphorus and high-weather-resistant steel by adopting single slag blowing converter. Background technique [0002] Phosphorus is generally regarded as a harmful element in steel materials, and its content is controlled within a certain range, but phosphorus is indeed an indispensable and important beneficial element in high weather resistance steel. Weather-resistant steel is widely used in China. The design of corrosion-resistant elements of high-weather-resistant steel is generally based on Cu-P, and the P content is generally 0.07-0.15% in terms of mass percentage. At the same time, in order to ensure the corrosion resistance of high-weather-resistant steel series , The C content is generally designed to be within 0.12%, which belongs to low-carb...

Claims

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Application Information

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IPC IPC(8): C21C5/28C21C5/35C21C5/36
CPCY02P10/20
Inventor 王新江李勇王新志张振申王三忠武郁璞程官江段贵生孙拓刘海强郭永谦孙玉强王中岐李志广夏志升
Owner ANYANG IRON & STEEL
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