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Method for producing low-manganese steel

A low-manganese steel and molten steel technology applied in the field of metallurgy to achieve the effects of easy operation, high cost and reasonable process time

Active Publication Date: 2017-06-09
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to achieve this goal without using special means or the means of coordinating various processes.
[0003] According to Anshan Iron and Steel's traditional smelting production practice and a large number of papers and patents, the production of low-manganese steel with traditional converters can remove manganese to a minimum of 0.03% to 0.04%, but it is impossible to achieve manganese less than 0.025% in converters

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A method for producing low manganese steel, the specific steps are as follows:

[0016] (1) Mix the desulfurized molten iron into the 1# converter with a capacity of 100t. Add about 3 tons of lime within 3 minutes of the start of smelting, and add the remaining 1 ton of lime at 4 minutes. The gun position is controlled at 2.2m~2.4m in the first 4 minutes, and the oxygen flow rate is controlled at 20000m 3 / h about, oxygen pressure 0.75 ~ 0.85MPa;

[0017] (2) The tapping temperature of the first half of the steel is 1438°C, the slag is blocked and the slag thickness is 70mm. The molten iron composition and the first half steel tapping composition are shown in Table 1:

[0018] Table 1 Tapping composition of molten iron and 1# converter (wt%)

[0019] C Si mn P S molten iron 4.45 0.52 0.16 0.10 0.005 Converter tapping 2.8 0.012 0.05 0.039 0.009

[0020] (3) The second half of the steel is operated in the 2# furnace. According ...

Embodiment 2

[0028] A method for producing low manganese steel, the specific steps are as follows:

[0029] (1) Mix the desulfurized molten iron into the 1# converter with a capacity of 100t. Add about 3 tons of lime within 3 minutes of the start of smelting, and add the remaining 1 ton of lime at 4 minutes. The gun position is controlled at 2.2m~2.4m in the first 4 minutes, and the oxygen flow rate is controlled at 20000m 3 / h about, oxygen pressure 0.75 ~ 0.85MPa;

[0030] (2) The tapping temperature of the first half of the steel is 1422°C, the slag is blocked and the slag thickness is 70mm. The molten iron composition and the first half steel tapping composition are shown in Table 4:

[0031] Table 4 Tapping composition of molten iron and 1# converter (wt%)

[0032] C Si mn P S molten iron 4.45 0.47 0.19 0.08 0.005 Converter tapping 2.85 0.01 0.054 0.028 0.010

[0033] (3) The second half of the steel is operated in the 2# furnace. According...

Embodiment 3

[0041] A method for producing low manganese steel, the specific steps are as follows:

[0042] (1) Mix the desulfurized molten iron into the 1# converter with a capacity of 100t. Add about 3 tons of lime within 3 minutes of the start of smelting, and add the remaining 1 ton of lime at 4 minutes. The gun position is controlled at 2.2m~2.4m in the first 4 minutes, and the oxygen flow rate is controlled at 20000m 3 / h about, oxygen pressure 0.75 ~ 0.85MPa;

[0043] (2) The tapping temperature of the first half of the steel is 1432°C, the slag is blocked and the slag thickness is 70mm. The molten iron composition and the first half steel tapping composition are shown in Table 7:

[0044] Table 7 Tapping composition of molten iron and 1# converter (wt%)

[0045] C Si mn P S molten iron 4.47 0.33 0.22 0.077 0.0048 Converter tapping 2.81 0.011 0.05 0.034 0.009

[0046] (3) The second half of the steel is operated in the 2# furnace. Accordi...

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Abstract

The invention discloses a method for producing low-manganese steel. Desulphurized molten iron is added into a first converter, 1 / 2-3 / 4 of total lime is added within 3 min after smelting starts, the left lime is added within 5 min, the lance position is 2.2-2.4 m within the first 4 min, the oxygen flow amount is 198-202 m<3> / h.t steel, and the oxygen pressure is 0.75-0.85 MPa. The tapping temperature of the first half steel is 1420-1440 DEG C, and half steel carbon is 2.8-3.2%. Slag tapping is controlled after tapping of the first half steel, and the slag thickness is smaller than 80 mm. The last half steel is subjected to blowing normally according to the internal control requirements of the converter, boiling steel tapping is conducted in a slag pushing-off mode, the slag thickness is smaller than 80 mm, and 2.5-3.5 kg / t steel of jarred lime is added during steel tapping. The last half steel is moved to an LF workstation after being hung on a jar to be subjected to heating and slagging, bottom blowing is conducted in the whole process, the bottom blowing argon flow amount is 80-100 m<3> / h, slagging lime is added in two or three times, and the total amount is 8-10 kg / t steel. The stirring time is not shorter than 25 min, and then slagging-off treatment is conducted. 1-3 kg / t steel of lime is added after slagging-off. According to the method, the final manganese content in the steel can be stably controlled to be smaller than 0.025%. The process is easy to operate, convenient and feasible.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for producing low manganese steel. Background technique [0002] With the increasingly fierce competition of steel products, more high value-added products are being developed. In the converter smelting-secondary refining-continuous casting process of traditional steel smelting, generally speaking, manganese is kept as a beneficial element as much as possible. For example, more articles and patents introduce how to increase the residual manganese at the end of the converter, direct alloying of manganese ore, and control the position of the oxygen lance to preserve manganese, etc. However, with the development of more high-quality steel, some steels must remove manganese as a harmful element. For example, high-quality pure iron even requires that the manganese content of the finished product is less than 0.025%. It is difficult to achieve this goal withou...

Claims

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Application Information

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IPC IPC(8): C21C5/28C21C7/072C21C7/04
CPCC21C5/28C21C7/04C21C7/072
Inventor 朱晓雷廖相巍赵成林郭庆涛贾吉祥刘祥李广帮曹东万雪峰
Owner ANGANG STEEL CO LTD
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