Converter smelting technique

A converter smelting and process technology, applied in the field of converter smelting process, can solve the problems of low carbon content, low metal yield and high tapping temperature, and achieve the effects of lower tapping temperature, high metal yield and reduced return to the furnace.

Inactive Publication Date: 2011-06-01
储鸿文 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Generally, the converter smelting process of steel includes charging, ignition, blowing, tapping, and slag splashing repair process. In the traditional converter smelting process, the splashing is serious during the blowing process, the metal yield is low, and the carbon content after blowing Low, high oxygen content, a large amount of alloy needs to be added to adjust the composition and deoxidation in the tapping process, and the tapping temperature is high, which is not conducive to the subsequent refining process or casting process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The converter quantitative smelting process of the present invention is suitable for 45F, and the clearance height in the furnace is 5.4m, including the following steps:

[0019] (1) Furnace loading process: 45 tons of molten iron with a temperature of 1310°C and 10 tons of scrap steel are charged;

[0020] (2) Ignition process;

[0021] (3) Blowing process: within 0.5 minutes of blowing, first lower the oxygen lance to the basic lance position (1m) + 200mm, control the oxygen pressure at 0.8MPa, add 1.5t of lime and 600kg of lightly burned dolomite within 1.5 minutes, After the feeding is completed, the gun position is lowered to the basic gun position (1m). When the blowing is started for 3.5 minutes, the gun position is slowly raised to the basic gun position (1m) + 100mm, and the oxygen pressure is adjusted to 0.70MPa at the same time. Start to add 1 ton of lime, 200kg of light-burned dolomite, 500kg of coolant, and 400kg of slagging agent. The main component of th...

Embodiment 2

[0029] The converter smelting process of the present invention is suitable for 40Cr, and the clearance height in the furnace is 5.4m, including the following steps:

[0030] (1) Furnace loading process: 45 tons of molten iron and 9 tons of scrap steel at a temperature of 1250°C are charged;

[0031] (2) Ignition process;

[0032] (3) Blowing process: within 0.5 minutes of blowing, first lower the oxygen lance to the basic lance position (1m) + 200mm, control the oxygen pressure at 0.85MPa, add 2t of lime and 400kg of lightly burned dolomite within 1.5 minutes, and feed After completion, the gun position is lowered to the basic gun position (1m). When the blowing is started for 4.5 minutes, the gun position is first raised to the basic gun position (1m) + 200mm, and the oxygen pressure is adjusted to 0.73MPa, and then the lime is added. 1 ton, 250kg of light-burned dolomite, 500kg of coolant, 400kg of slagging agent, the main coolant is FeO.CaO, and the main slagging agent is ...

Embodiment 3

[0040] The converter smelting process of the present invention is applicable to HML10, and the clearance height in the furnace is 5.4m, including the following steps:

[0041] (1) Furnace loading process: 45 tons of molten iron with a temperature of 1350°C and 11 tons of scrap steel are charged;

[0042] (2) Ignition process;

[0043] (3) Blowing process: within 0.5 minutes of blowing, first lower the oxygen lance to the basic lance position (1m) + 200mm, control the oxygen pressure at 0.83MPa, add 1.75t of lime and 600kg of lightly burned dolomite within 1.5 minutes, After the feeding is completed, the gun position is lowered to the basic gun position (1m). When the blowing is started for 4 minutes, the gun position is first raised to the basic gun position (1m) + 150mm, and the oxygen pressure is adjusted to 0.78MPa, and then start to add 1 ton of lime, 100kg of light-burned dolomite, 250kg of coolant, and 200kg of slagging agent. The main component of the coolant is FeO.CaO,...

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PUM

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Abstract

The invention relates to a steel smelting technique, in particular to a converter smelting technique. The invention aims to provide a converter smelting technique, which has the advantages of less splash, and high content of smelting end point carbon and low oxygen content in the mid-high-carbon steel during production process and greatly reduces the remelting caused by excessive carbon content in the low-carbon steel production process. The converter smelting technique comprises the following steps: (1) charging: charging molten iron and scrap steel into the converter; (2) igniting; (3) converting: within 0.5 minutes after starting converting, lowering an oxygen lance to the basic position+200mm; adding lime and lightly fired dolomite within 1.5 minutes; lowering the oxygen lance to the basic position after finishing adding the materials; slowly raising the oxygen lance to the basic position+100 to +200mm and adding lime, lightly fired dolomite, coolant and slag melting agent within 3.5-4.5 times; controlling the oxygen lance to be in the basic position to basic position+600mm within 9.5-12 minutes; and controlling the oxygen lance to be in the basic position-100mm to the basic position after 12 minutes; (4) tapping; and (5) slag splashing repair.

Description

technical field [0001] The invention relates to a steel smelting process, in particular to a converter smelting process. Background technique [0002] Converter steelmaking (converter steelmaking) uses molten iron, scrap steel, and ferroalloy as the main raw materials, and completes the steelmaking process in the converter by relying on the physical heat of the molten iron itself and the chemical reaction between the components of the molten iron to generate heat without resorting to external energy. The converter is divided into top blowing, bottom blowing, side blowing and double blowing according to the part where the gas is blown into the furnace; according to the type of gas, it is divided into air converter and oxygen converter. [0003] Generally, the converter smelting process of steel includes charging, ignition, blowing, tapping, and slag splashing repair process. In the traditional converter smelting process, the splashing is serious during the blowing process, th...

Claims

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Application Information

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IPC IPC(8): C21C5/28C21C5/30C21C5/46
CPCY02P10/20
Inventor 储鸿文郑卫民杨利康金进文庄春荣
Owner 储鸿文
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