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Deoxidation smelting method of slab Q235 steel and slab Q235 steel

A smelting method and slab technology, which are applied to the deoxidation smelting of slab Q235 steel and the field of slab Q235 steel, can solve the problems of rising occurrence rate of edge cracking of steel plates and waste of production cost.

Active Publication Date: 2022-08-05
WUHAN IRON & STEEL GRP ECHENG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the control is not good, the acid-soluble aluminum is too high (usually above 0.030%), which will not only cause waste of production costs, but also may produce aluminum nitride, resulting in a sharp increase in the incidence of steel plate edge cracks

Method used

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  • Deoxidation smelting method of slab Q235 steel and slab Q235 steel
  • Deoxidation smelting method of slab Q235 steel and slab Q235 steel
  • Deoxidation smelting method of slab Q235 steel and slab Q235 steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] This embodiment provides a plate blank Q235 steel, which is obtained through the following methods:

[0057] S1: Carry out the smelting operation of the turntable, load 125T iron water and 35T scrap steel in the furnace, the total installation of iron and scrap steel is 160T, the amount of iron in the iron water is 825kg / T. And use the bottom -bottom re -blowing turntable blowing process to blow the bottom of the process;

[0058] S2: Load the slag, the slag includes 30kg of lime and 8kg of magnesium balls, and the amount of slag in the slag at the beginning of the blowing is 30 %. It

[0059] S3: Oxygen gun flow control at 33000M 3 / h; the gun position when the oxygen gun blows is 1.8m, and the static deputy grab TSC measures the carbon content of 0.35 %;

[0060] S4: Add manganese and silicon for steel deoxification alloy operation. The amount of manganese controls 0.40 % of the steel water, the amount of silicon is controlled by 0.20 % of the steel water, the carbon cont...

Embodiment 2

[0065] This embodiment provides a plate blank Q235 steel, which is obtained through the following methods:

[0066] S1: Carry out the smelting operation of the turntable, loads 126T iron water and 36T scrap steel in the furnace. And use the bottom -bottom re -blowing turntable blowing process to blow the bottom of the process;

[0067] S2: Load the slag, the slag includes 35kg of lime and 8kg of magnesium balls, and the amount of slag in the slag at the beginning of the blowing is 31 %, and the remaining 69 % of the slag is added within 4min after the blowing start. It

[0068] S3: Oxygen gun flow control at 33000M 3 / h; the gun position when the oxygen gun blows is 1.9m, and the static deputy grab TSC measures the carbon content of 0.37 %;

[0069] S4: Add manganese and silicon for steel deoxification alloy operation. The amount of manganese controls 0.42 % of steel water, the amount of silicon is controlled by 0.21 % of the steel water, the carbon content of the steel out of ste...

Embodiment 3

[0074] This embodiment provides a plate blank Q235 steel, which is obtained through the following methods:

[0075] S1: Carry out the smelting operation of the turntable, load 127T iron water and 37T scrap steel in the furnace, the total installation of iron and scrap steel is 164T, the amount of iron in the iron water is 827kg / T. And use the bottom -bottom re -blowing turntable blowing process to blow the bottom of the process;

[0076] S2: Load the slag, the slag includes 37kg of lime and 9kg of magnesium balls, and the amount of slag in the slag at the beginning of the blowing is 32 %. It

[0077]S3: Oxygen gun flow control at 34000M 3 / h; the gun position when the oxygen gun blows is 1.8m, and the static deputy grab TSC measures the carbon content of 0.38 %;

[0078] S4: Add manganese and silicon for steel deoxification alloy operation. The amount of manganese controls 0.44 % of steel water, the amount of silicon is controlled by 0.22 % of the steel water, the carbon content o...

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Abstract

The invention discloses a deoxidation smelting method of slab Q235 steel and the slab Q235 steel, and relates to the technical field of smelting. The smelting method comprises the steps that molten iron and scrap steel are loaded, the top-bottom combined blowing converter blowing process is adopted, and argon is blown from the bottom in the whole process; slag charge is loaded, the loading amount of the slag charge at the beginning of blowing is 30%, and the rest 70% of the slag charge is completely added within 10 min after blowing is started; the flow of the oxygen lance is controlled to be 33000-35000 m < 3 > / h The lance position of the oxygen lance during blowing is 1.8-2 m; manganese and silicon are added for tapping deoxidation alloying operation; after tapping, aluminum wire feeding operation is carried out in an argon station; transferring into an LF furnace for refining; and performing continuous casting. The smelting method can ensure good deoxidation of the molten steel, reduce subsurface bubbles generated by the molten steel, reduce the cost, ensure the castability of the molten steel and reduce the occurrence rate of edge cracks.

Description

Technical field [0001] The present invention involves the field of smelting technology. Specifically, it involves a dehydrated smelting method and plate blank Q235 steel for the Q235 steel. Background technique [0002] The Q235 of the board is one of the most used and the most widely used steel. The blank Q235 steel water is not completely dehydrated, and it is easy to produce subcutaneous bubbles during the rolling process, which causes the steel plate to be discarded in severe cases. For the sake of a stable period, most steel mills are used as a certain value (generally 0.010 % or above) as a dehydration and standard values ​​in the dose of the steel water. When the control is not good, the acid -soluble aluminum is too high (usually more than 0.030 %), which will not only cause waste of production costs, but also generate aluminum nitride, causing the incidence of steel plate cracks to rise sharply. [0003] In view of this, the invention is specifically proposed. Invention...

Claims

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Application Information

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IPC IPC(8): C21C7/06C21C7/072
CPCC21C7/06C21C7/072Y02P10/20
Inventor 金海兵夏金魁黄琼严敏彭小奇
Owner WUHAN IRON & STEEL GRP ECHENG IRON & STEEL CO LTD
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