Method for smelting high-carbon steel from semi-steel

A high-carbon steel and steel smelting technology, used in the manufacture of converters and other directions, can solve the problems of slow slag formation, single component, low carbon weight percentage, etc., to promote rapid slag generation and slow down the carbon-oxygen reaction rate. , the effect of improving the dephosphorization efficiency

Inactive Publication Date: 2012-11-07
PANGANG GROUP RESEARCH INSTITUTE CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for semi-steel steelmaking enterprises, due to the low carbon weight percentage in the semi-steel obtained after desulfurization and vanadium extraction (for example, 3.4wt% ~ 4.0wt%),

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0022] A factory smelts bearing steel GCr15 with vanadium-extracted semi-steel as raw material. The finished steel of this steel requires a carbon content of 0.95wt% to 1.03wt%. The nominal capacity of the steelmaking converter is 120t.

[0023] The semi-steel C obtained after vanadium extraction from molten iron by the shallow vanadium extraction process is 3.70wt%, the temperature is 1310°C, Si is traces, and the weight is 130t. Smelting is carried out by high-drawing supplementary blowing method. Before smelting, the furnace is low-sulfur steel. After the steel is tapped, slag is splashed to protect the furnace, and all the slag at the end is retained. 1.3t of active lime (85wt% CaO) and 1t of active lime are added to the converter. High magnesium lime (45wt% CaO, 30wt% MgO) thickens the slag. Add semi-steel, add 1t of ferrosilicon (73wt% Si, 1wt% Mn) according to the basicity requirements of the primary slag, pour the furnace after blowing for 5min, pour out the phosphorus...

example 2

[0025] A factory smelts P72LXB with vanadium-extracted semi-steel as raw material. The finished steel of this steel requires a carbon content of 0.70wt% to 74wt%. The nominal capacity of the steelmaking converter is 120t.

[0026] The semi-steel C obtained after vanadium extraction from molten iron by the shallow vanadium extraction process is 3.95wt%, the temperature is 1290°C, Si is traces, and the weight is 135t. Smelting is carried out by high-drawing supplementary blowing method. Before smelting, the furnace is low-sulfur steel. After the steel is tapped, slag is splashed to protect the furnace, and all the slag at the end is retained. 2t of active lime (90wt% CaO) and 1.35t of active lime are added to the converter. Magnesia lime (55 wt% CaO, 45 wt% MgO) thickens the slag. Add semi-steel, add 1.32t of ferrosilicon (75wt% Si, 2wt% Mn) according to the basicity requirements of the primary slag, turn down the furnace after blowing for 4min, pour out the phosphorus-rich slag...

example 3

[0028] A factory uses vanadium-extracted semi-steel as raw material to smelt P82LXA. The finished steel of this steel requires a carbon content of 0.79wt% to 0.84wt%. The nominal capacity of the steelmaking converter is 120t.

[0029] The semi-steel C obtained after vanadium extraction from molten iron by the shallow vanadium extraction process is 3.80wt%, the temperature is 1300°C, Si is traces, and the weight is 136t. Smelting is carried out by high-strength supplementary blowing method. Before smelting, the furnace is low-sulfur steel. After the steel is tapped, slag is splashed to protect the furnace, and all the slag at the end is retained. 1.5t of active lime (88wt% CaO) and 1.2 t High magnesium lime (45wt% CaO, 50wt% MgO) thickens the slag. Add semi-steel, add 1.2t of ferrosilicon (78wt% Si, 1.5wt% Mn) according to the basicity requirements of the primary slag, pour the furnace after blowing for 3min, pour out the phosphorus-rich slag for secondary slagging. Add 1.7t a...

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Abstract

The invention provides a method for smelting high-carbon steel from semi-steel. The method adopts the semi-steel after extraction of vanadium as a raw material, and comprises the following steps of: adopting a low vanadium extraction process during smelting of a vanadium extraction converter to ensure that the carbon content of the semi-steel after the extraction of vanadium is not smaller than 3.70 weight percent, and the temperature of the semi-steel is not lower than 1,290 DEG C; adding active lime into the converter according to a standard of 10 to 15 kg in a ton of steel, adding high-magnesium lime into the converter according to a standard of 7 to 10 kg in a ton of steel, shaking the converter back and forth to ensure that the active lime and the high-magnesium lime are uniformly mixed with steel slag in the converter, then adding the semi-steel into the converter, and adding a ferro-silicon alloy into the converter, wherein the added amount of the ferro-silicon alloy can ensure that the initial alkalinity of furnace slag is 2 to 3; performing converting, and pouring out the furnace slag when the temperature of a molten pool is raised to be 1,400 to 1,500 DEG C; adding active lime into the converter according to a standard of 12 to 18 kg in a ton of steel and adding high-magnesium lime into the converter according to a standard of 9 to 12 kg in a ton of steel to perform secondary slagging; performing converting, and adding manganiferous iron ore into the converter to ensure that the alkalinity of the furnace slag is 4 to 5 and a CaO-SiO2-FeO-MnO low-melting-point slag system is formed; adding a cooling agent into the converter after converting for 3 to 5 minutes, and continuously converting until target molten steel and terminal furnace slag are obtained; and tapping. According to the method, dephophorization and carbon maintenance can be realized at the same time.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, and more specifically, relates to a method for smelting high-carbon steel by using semi-steel after vanadium extraction. Background technique [0002] Usually, the method of converter smelting high carbon steel includes carburization method and high drawing supplementary blowing method. For the carburizing method, the tapping carbon is low, and a carburizing agent is added during the tapping process to carburize the molten steel. The carburizing method can ensure that the final molten steel has a low phosphorus content, but a large amount of carburizing agent needs to be added after tapping, so the composition of the molten steel fluctuates greatly. For the high-drawing supplementary blowing method, the carbon content of the tapped steel is relatively high, generally between 0.30wt% and 0.60wt%, the oxygen content in the molten steel is low, the alloy yield is high and stable, ...

Claims

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Application Information

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IPC IPC(8): C21C5/30
Inventor 陈均曾建华陈永梁新腾李青春翁建军李盛何为谢明科
Owner PANGANG GROUP RESEARCH INSTITUTE CO LTD
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