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Accident alloy disposal method

A disposal method and alloy technology, applied in the field of iron and steel smelting, can solve the problems of difficult alloy sorting, the use of compounding components, and the inability to function as compounding components.

Active Publication Date: 2021-06-22
SGIS SONGSHAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The alloys that cannot be used normally due to equipment failure or other reasons are collectively referred to as accidental alloys. The accidental alloys are mainly ferrosilicon alloys and silicon-manganese alloys. Control, in order to avoid out-of-standard accidents, accidental alloys cannot be used as additives for steel types. It is necessary to manually separate silicon-manganese alloys and ferrosilicon alloys. The workload is heavy, and the sorting of powdered alloys is extremely difficult.
In addition, the sorted silicon-manganese alloy is generally used to remove steel slag after deoxidation of converter tapping, which cannot play the role of adding ingredients, resulting in waste of resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] A 120t converter is used for the preparation of steel grade: HRB400E-02, and the preparation path of HRB400E-02 is converter-LF furnace-billet continuous casting machine.

[0051] Among them, in terms of mass percentage, the composition ratio requirements of C, Si and Mn in the steel grade HRB400E-02 are: C: 0.22-0.24%, Si: 0.27-0.37%, Mn: 1.3-1.4%. In the actual addition process, since the specific content of Mn has a deviation range of ±0.05%, the lower limit of the Mn ratio is 1.3±0.05%.

[0052] The disposal method of accidental alloy, it comprises the following steps:

[0053] S1. Converter steelmaking, the molten steel obtained from smelting is sampled for component analysis, calculated by mass percentage, the components of molten steel at this time are C: 0.219%, Si: 0%, Mn: 0.123%. The molten steel obtained by smelting was analyzed for temperature, and the temperature was 1542°C.

[0054] S2. Converter tapping: Since the temperature does not meet the tapping r...

Embodiment 2

[0059] A 120t converter was used to prepare the steel type: Q345C.

[0060] Among them, in terms of mass percentage, the composition ratio requirements of C, Si and Mn in the steel grade Q345C are: C: 0.14-0.18%, Si: 0.15-0.30%, Mn: 1.4-1.5%.

[0061] The disposal method of accidental alloy, it comprises the following steps:

[0062] S1. Converter steelmaking, the molten steel obtained by smelting is sampled for component analysis, calculated by mass percentage, the components of molten steel at this time are C: 0.11%, Si: 0%, Mn: 0.16%. The molten steel obtained by smelting was analyzed for temperature, and the temperature was 1583°C.

[0063] S2. Converter tapping: Since the temperature does not meet the tapping requirements, the steel is tapped into a 120t ladle after blowing oxygen for 28 seconds, and the decarburization rate is 0.01% (mass percentage) every 4.5 seconds ) calculation, it is estimated that the carbon content at the end of the converter is C: 0.05%, and wh...

Embodiment 3

[0068] A 120t converter is used for the preparation of steel grade: Q235B, and the preparation path of Q235B is converter-LF furnace-billet continuous casting machine.

[0069] Among them, in terms of mass percentage, the composition ratio requirements of C, Si and Mn in the steel grade Q235B are: C: 0.14-0.16%, Si: 0.10-0.21%, Mn: 0.4-0.5%.

[0070] The disposal method of accidental alloy, it comprises the following steps:

[0071] S1. Converter steelmaking, the molten steel obtained by smelting is sampled for component analysis, calculated by mass percentage, the components of molten steel at this time are C: 0.069%, Si: 0%, Mn: 0.15%. The molten steel obtained by smelting was analyzed for temperature, and the temperature was 1605°C.

[0072] S2. Converter tapping: the carbon content at the end of the converter is C: 0.069%, and when the tapping amount reaches 1 / 6 of its weight, 30kg of carbon powder and 30kg of accidental alloy are manually thrown into the ladle for deoxid...

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PUM

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Abstract

The invention discloses an accident alloy disposal method and belongs to the field of steel smelting. The accident alloy disposal method comprises the following steps of S1, converter steelmaking; S2, converter tapping, specifically, before alloying operation is conducted, accident alloy and a deoxidizing agent are added for deoxidation, after the tapping amount is complete, at least part of the accident alloy is deoxidized into oxide and exists in steel slag, the oxide comprises manganese dioxide, a manganese source is added according to the lower limit of Mn contained in a steel grade for alloying operation, the accident alloy is added according to the condition that the Mn content in a silicon-manganese alloy contained in the accident alloy is not larger than 0.05% of the mass percent of molten steel, and the deoxidizing agent does not contain the silicon-manganese alloy; and S3, LF furnace refining. Therefore, on the premise that silicon-manganese alloy and silicon-iron alloy in the accident alloy are not sorted, the accident alloy is directly added into the molten steel, so that not only is effective deoxidation achieved, but also Mn is effectively added as an adding component, the accident that the components go out of the standard is not caused, the utilization rate of the accident alloy is effectively increased, and resource waste is prevented.

Description

technical field [0001] This application relates to the field of iron and steel smelting, in particular, to a method for disposing of accidental alloys. Background technique [0002] The alloys that cannot be used normally due to equipment failure or other reasons are collectively referred to as accidental alloys. The accidental alloys are mainly ferrosilicon alloys and silicon-manganese alloys. Control, in order to avoid accidents with out-of-spec components, accidental alloys cannot be used as additives for steel types. It is necessary to manually separate silicon-manganese alloys and ferrosilicon alloys. The workload is heavy, and the sorting of powdered alloys is extremely difficult. Moreover, the sorted silicon-manganese alloys are generally used to remove steel slag after deoxidation of converter tapping, which cannot play the role of adding ingredients, resulting in waste of resources. Contents of the invention [0003] The present application provides a method for ...

Claims

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Application Information

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IPC IPC(8): C21C7/00C21C7/06C22C38/02C22C38/04
CPCC21C7/0006C21C7/06C22C38/02C22C38/04
Inventor 马欢张建平肖双林佟迎林伟忠邓长付
Owner SGIS SONGSHAN CO LTD
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