Alloying method adding manganese ore in RH refining process

A refining process and alloying technology, which is applied in the field of steelmaking process using manganese ore alloying, can solve the problems of increased oxygen content in molten steel, excessive inclusions, and increased consumption of reducing agents, so as to improve reducing ability and reduce steelmaking cost, yield improvement effect

Inactive Publication Date: 2015-04-29
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, after directly adding manganese ore to molten steel, the manganese ore is heated and decomposed by the action of high-temperature molten steel (the temperature of molten steel is usually above 1500°C), and oxygen is released directly into molten steel, resulting in a sharp increase in the oxygen content of molten steel, which will significantly increase the reduction The consumption of the agent, and it is easy to cause the inclusions in the steel to exceed the standard

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The chemical composition of embodiment steel grade is:

[0023] C:0.0015%-0.0035%;Si:0.01%-0.03%;Mn:0.10%-0.20%;P:≤0.015%;S:≤0.010%;Als:0.015%-0.045%; %.

[0024] 1) The starting temperature of RH treatment is 1590℃.

[0025] 2) Before RH alloying, add manganese ore in 3 batches through the alloy chute, the particle size of the added manganese ore is between 15-35mm, and the phosphorus and sulfur contents of the manganese ore are less than 0.05%. The amount of manganese ore added is 400kg. Based on the calculation of 100 tons of steel, the actual amount of manganese ore added is 4kg / ton of steel.

[0026] 3) After adding manganese ore, the RH riser gas flow is controlled at 135NM 3 / h; the cycle time is 7min; the vacuum chamber pressure is 50Pa.

[0027] 4) After the cycle operation is completed, since the manganese content in the steel reaches 0.14%, which meets the lower limit requirements of the steel grade, there is no need to add manganese-containing ferroalloy...

Embodiment 2

[0030]C:0.01%-0.03%;Si:0.01%-0.03%;Mn:0.18%-0.25%;P:≤0.015%;S:≤0.015%;Als:0.025%-0.055%.

[0031] 1) The initial temperature of RH treatment is 1595°C.

[0032] 2) Before RH alloying, add manganese ore through the alloy chute in 5 batches, the particle size of the added manganese ore is between 15-35mm, and the phosphorus and sulfur contents of the manganese ore are less than 0.05%. The amount of manganese ore added is 550kg. Based on the calculation of 100 tons of steel, the actual amount of manganese ore added is 5.5kg / ton of steel.

[0033] 3) After adding manganese ore, the RH riser gas flow is controlled at 145NM 3 / h, the cycle time is 9min; the vacuum chamber pressure is 140Pa.

[0034] 4) After the cycle operation is completed, since the manganese content in the steel has reached 0.20%, which has met the lower limit requirements of the steel grade, there is no need to add manganese-containing ferroalloys such as ferromanganese and ferrosilicon manganese for adjustmen...

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Abstract

The invention discloses an alloying method adding a manganese ore in an RH refining process, wherein the method comprises the steps: 1) controlling an RH treatment starting molten steel temperature at 1580-1600 DEG C; 2) before RH alloying, dividing into 2-5 batches, adding the manganese ore through an alloy chute, wherein the added manganese ore is required to have the diameter of 10-50 mm, the mass percentage contents of phosphorus and sulfur in the manganese ore are both required to be less than 0.05%, and the addition amount of the manganese ore is not more than 15 kg/t-steel; 3) after adding the manganese ore, controlling the flow quantity of rising gas of an RH rising tube at 130-150 Nm<3>/h; controlling the cycling time in 6-10 min; and controlling the vacuum chamber pressure to be less than 150 Pa; and 4) after cycle operation is finished, carrying out deoxidation alloying, and adjusting the composition of molten steel to a steel type target value. The process has simple operation, does not need to improvement of original equipment, does not affect other production operations, and can significantly reduce the cost of steelmaking.

Description

technical field [0001] The invention relates to a method for smelting manganese-containing steel, in particular to a steelmaking process using manganese ore alloying. Background technique [0002] Manganese is one of the main alloying elements in steel materials. It plays an important role in strengthening the properties of steel. Usually, when alloying manganese in steelmaking, ferroalloys containing manganese, such as ferromanganese and ferrosilicon manganese, are used in the tapping or refining process. manganese alloying. However, ferromanganese, ferrosilicomanganese and other ferroalloys used in alloying need to be made from manganese ore in ferroalloy factories. The process of manufacturing ferromanganese, ferrosilicomanganese and other ferroalloys is a process of high energy consumption and high pollution, which will eventually lead to environmental pollution and Steelmaking production costs increased. [0003] There are many types of manganese ore, which can be div...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/10
Inventor 尚德礼孙群吕春风康磊廖相巍于守巍齐志宇常桂华
Owner ANGANG STEEL CO LTD
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