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High-phosphorus IF (Interstitial-Free) steel and smelting method thereof

A smelting method and high phosphorus technology, applied in the field of iron and steel smelting, can solve problems such as poor cleanliness of molten steel, achieve the effects of reduced defect rate of rolled products, obvious economic benefits, and reduced liquid level fluctuations

Active Publication Date: 2019-01-08
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a high-phosphorus IF steel and its smelting method to solve the problem of poor cleanliness of molten steel due to nozzle nodules in the smelting process of high-phosphorus IF steel

Method used

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  • High-phosphorus IF (Interstitial-Free) steel and smelting method thereof
  • High-phosphorus IF (Interstitial-Free) steel and smelting method thereof
  • High-phosphorus IF (Interstitial-Free) steel and smelting method thereof

Examples

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Effect test

Embodiment 1

[0016] A method for smelting high-phosphorus IF steel, comprising converter smelting, RH refining and continuous casting; its concrete steps are as follows:

[0017] Step 1), adding 250t of desulfurized molten iron into the converter for smelting, the temperature at the end of the converter is 1720°C, the C content is 0.025wt%, the O content is 790ppm, and the P content is 0.04wt%;

[0018] In step 2), when 1 / 3 of the molten steel smelted in step 1) is tapped from the converter, 1200kg of lime is added to the ladle, and the bottom blowing argon gas is turned on simultaneously during the tapping process, and after the tapping is completed, pour the slag into the ladle Add 600kg of aluminum slag to the surface to modify the ladle slag;

[0019] Step 3), T.Fe=7.8% in the slag when RH enters the station; Carry out RH refining, vacuum decarburization treatment, add carbon ferromanganese and phosphorus ferromanganese in the first 10 minutes of decarburization treatment to roughly ad...

Embodiment 2

[0023] A method for smelting high-phosphorus IF steel, comprising converter smelting, RH refining and continuous casting; its concrete steps are as follows:

[0024] Step 1), adding 250t of desulfurized molten iron into the converter for smelting, and controlling the temperature at the end point of the converter to be 1710°C, the content of C: 0.030wt%, the content of O: 703ppm, and the content of P: ≤0.03wt%;

[0025] Step 2), when 1 / 3 of the molten steel smelted in step 1) is tapped from the converter, 1000kg of lime is added to the ladle, and the bottom blowing argon gas is turned on at the same time to stir during the tapping process. Add 500kg of aluminum slag to the surface to modify the ladle slag;

[0026] Step 3), when RH enters the station, T.Fe=5.0% in the slag; carry out RH refining, vacuum decarburization treatment, and add carbon ferromanganese and phosphorus ferromanganese within 10 minutes of decarburization treatment to roughly adjust the composition of molten...

Embodiment 3

[0030] A method for smelting high-phosphorus IF steel, comprising converter smelting, RH refining and continuous casting; its concrete steps are as follows:

[0031] Step 1), adding 250t of desulfurized molten iron into the converter for smelting, the temperature at the end of the converter is 1716°C, the C content is 0.031wt%, the O content is 600ppm, and the P content is 0.03wt%;

[0032] Step 2), when 1 / 3 of the molten steel smelted in step 1) is tapped from the converter, 800kg of lime is added to the ladle, and the bottom blowing argon gas is turned on simultaneously during the tapping process to stir. Add 400kg of aluminum slag to the surface to modify the ladle slag;

[0033] Step 3), when RH enters the station, T.Fe=4.8% in the slag; carry out RH refining, vacuum decarburization treatment, add carbon ferromanganese and phosphorus ferromanganese in the first 10 minutes of decarburization treatment to roughly adjust the molten steel composition, After 17 minutes of vacu...

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Abstract

The invention belongs to the field of iron and steel smelting, and particularly relates to high-phosphorus IF (Interstitial-Free) steel and a smelting method thereof. The smelting method is prepared through converter smelting, RH refining and continuous casting. The high-phosphorus IF steel comprises the following components: 0.0025 to 0.0030 weight percent of C, 0.55 to 0.65 weight percent of Mn,0.50 to 0.60 weight percent of Si, less than or equal to 0.01 weight percent of S, 0.090 to 0.10 weight percent of P, 0.020 to 0.025 weight percent of Nb, 0.0005 weight percent of B and the balance of Fe. When the method disclosed by the invention is adopted to pour the high-phosphorus IF steel, the liquid level fluctuation of a crystallizer is obviously reduced, and the content of large-sized inclusions in a casting blank is relatively low; in a cold rolling process, the defect rate of a rolled material is reduced; the high-phosphorus IF steel has obvious economical benefits.

Description

technical field [0001] The invention belongs to the field of iron and steel smelting, and in particular relates to a high-phosphorus IF steel and a smelting method thereof. Background technique [0002] Due to its high strength and ultra-deep drawability, high-phosphorus IF steel has been developed and applied rapidly in recent years. This type of steel is suitable for making particularly complex automotive structural parts, such as car extension brackets, suspension mounting beams, steering Machine installed support beams, reinforcing plates, etc., and gradually used in automotive panels (O5 plates), so the cleanliness of molten steel is required. During the smelting process of high-phosphorus IF steel, mold liquid level fluctuations are prone to occur due to nozzle nodulation, which seriously affects the cleanliness level of molten steel, resulting in high-phosphorus IF steel often appearing in the cold rolling process caused by inclusions. Surface defects, such as surfac...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/02C22C38/12C22C33/06C21C7/068C21C7/10C21C7/06
CPCC21C7/06C21C7/068C21C7/10C22C33/06C22C38/002C22C38/004C22C38/02C22C38/04C22C38/12C22C38/32
Inventor 王睿闫志杰李大赵康燕武立
Owner ZHONGBEI UNIV
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