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Semi-steel smelting method

A technology of steel smelting and ladle, applied in the field of converter steelmaking, can solve the problem of low carbon content of semi-steel finished products, achieve the effect of increasing carbon content, increasing reaction interface area, and simple adding method

Inactive Publication Date: 2018-02-23
SHOUGANG JINGTANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The embodiment of the present invention solves the technical problem that the carbon content of the semi-steel finished product produced by the converter is relatively low by providing a semi-steel smelting method

Method used

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  • Semi-steel smelting method

Examples

Experimental program
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Effect test

example 1

[0045] After smelting the semi-steel, start to tap the steel. From the moment of tapping 2 minutes, add the weighed 1102kg recarburizer into the semi-steel ladle. The process of adding the recarburizer is carried out at the same time as the tapping. After tapping, the slag is blocked by a slide , Tapping takes 6 minutes, and tapping ends.

example 2

[0047] After the half-steel is smelted, the tapping starts. At the time of tapping for 1 minute and 35 seconds, add the weighed 1050kg recarburizer into the semi-ladle. The feeding process of the recarburizer is carried out at the same time as the tapping. It took 5 minutes and 45 seconds to block the slag and tap the steel.

example 3

[0049] After smelting the semi-steel, start to tap steel. From the moment of tapping for 1 minute and 50 seconds, add 1085kg carburant to the semi-ladle. The process of adding carburant and tapping is carried out at the same time. After tapping, the slag is blocked by a slide plate. Tapping took 6 minutes and 10 seconds.

[0050] The molten steel samples obtained before tapping and the molten steel samples in the half-ladle were sampled and tested, and the comparative composition changes are shown in Table 1 and Table 2 below:

[0051] Table 1. Composition content of molten steel samples obtained before tapping (the balance is Fe)

[0052] the case

C

Si

mn

P

S

1

3.1883％

0.0133％

0.0491％

0.0212％

0.0045％

2

3.2833％

0.0171％

0.0385％

0.0221％

0.0032％

3

3.2457％

0.0143％

0.0470％

0.0337％

0.0038％

[0053] Table 2. Composition content of molten steel samples in half ladle (mass percentage %, balan...

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Abstract

The invention discloses a semi-steel smelting method. The semi-steel smelting method is applied to the technical field of converter steel smelting. The method comprises the steps that a recarburizingagent is conveyed to a middle-position alloy bin through a belt from a steel plant underground bunker; molten steel formed through semi-steel smelting is tapped to a semi-steel ladle; an alloy electric vibrator corresponding to the the middle-position alloy bin is started, the recarburizing agent is prepared to an alloy weighing hopper from the middle-position alloy bin, and on the basis of the alloy weighing hopper, the current steel tapping amount is weighed; when the amount of molten steel tapped to the semi-steel ladle reaches the reserved steel tapping amount, the recarburizing agent needed by the current steel tapping is added into the semi-steel ladle. The method solves the technical problem that the carbon content of a semi-steel finished product produced through a converter is low. The carbon content in the semi steel is increased, the adding manner of the recarburizing agent is simple, the recarburizing agent is rapid in smelting, and an extra operation device is not needed.

Description

technical field [0001] The invention relates to the technical field of converter steelmaking, in particular to a semi-steel smelting method. Background technique [0002] Semi-steel is a kind of hypereutectoid cast steel with extremely high carbon content. This kind of high-carbon cast steel has actually extended into the category of cast iron, so it is commonly called semi-steel. It is usually used to manufacture cast steel rolls, called semi-steel rolls. According to the characteristics of full three-stripping production of the steelmaking operation department, semi-steel is the product of dephosphorization furnace smelting, and the carbon content of existing semi-steel fluctuates around 2.8%-3.3%. In the existing technology, the carbon content of the molten iron produced by the blast furnace is maintained at a relatively low value, and the carbon content of the semi-steel finished product produced from this is relatively low, which cannot meet the heat demand at the end o...

Claims

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Application Information

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IPC IPC(8): C22C33/04C21C5/28
CPCC22C33/04C21C5/28
Inventor 潘云龙罗磊刘延强张丙龙李金柱袁天祥赵长亮边吉明孟德伟关顺宽王少军
Owner SHOUGANG JINGTANG IRON & STEEL CO LTD
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