Manganese-containing steel alloying process

An alloying and process technology, applied in the field of smelting, can solve the problems of increased oxygen content in molten steel, excessive inclusions, increased reducing agent consumption, etc., and achieves the effect of simple process operation and reduction of steelmaking costs.

Active Publication Date: 2014-06-25
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adding manganese ore to molten steel directly releases oxygen into the molten steel due to its thermal decomposition, resulting in a sharp increase in the oxygen content of the molten steel, which will significantly increase the consumption of reducing agents and easily lead to excessive inclusions in the steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The chemical composition of embodiment steel grade is:

[0028] C:0.09%-0.15%;Si:0.12%-0.30%;Mn:0.25%-0.55%;P:≤0.04%;S:≤0.04%

[0029] 1. Ladle baking

[0030] 1) Choose a manganese ore block with a particle size of 15-40mm, and the phosphorus and sulfur content of the manganese ore is less than 0.05%.

[0031] 2) Add 700kg of manganese ore to the ladle. According to the calculation of 100 tons of steel, the actual amount of manganese ore added is 7kg / ton of steel.

[0032] 3) Ladle baking temperature is 1050°C, and the time to reach 1050°C is as long as 2.5 hours,

[0033] 4) During the transfer process after the ladle is baked, the top of the ladle is covered with a ladle cover;

[0034] 2. Converter operation

[0035] 1) The converter is loaded with 90t of molten iron, 10t of scrap steel, and the blowing oxygen supply intensity is 3.44Nm 3 / min·t, lime and other slagging materials are added during the blowing process, and the final slag alkalinity is 3.5,

[00...

Embodiment 2

[0044] The chemical composition of embodiment steel grade is:

[0045] C:0.12%-0.20%;Si:0.12%-0.30%;Mn:0.30%-0.70%;P:≤0.045%;S:≤0.045%

[0046] 1. Ladle baking

[0047] 1) Choose a manganese ore block with a particle size of 20-45mm, and the phosphorus and sulfur content of the manganese ore is less than 0.05%.

[0048] 2) Add 1000kg of manganese ore to the ladle. According to the calculation of 100 tons of steel, the actual amount of manganese ore added is 10kg / ton of steel.

[0049] 3) Ladle baking temperature is 1020°C, and the time to reach 1020°C is as long as 3 hours,

[0050] 4) During the transfer process after the ladle is baked, the top of the ladle is covered with a ladle cover;

[0051] 2. Converter operation

[0052] 1) The converter is loaded with 90t of molten iron, 10t of scrap steel, and the blowing oxygen supply intensity is 3.44Nm 3 / min·t, lime and other slagging materials are added during the blowing process, and the final slag alkalinity is 3.8,

[...

Embodiment 3

[0061] The chemical composition of embodiment steel grade is:

[0062] C:0.12%-0.18%;Si:0.15%-0.30%;Mn:0.45%-0.80%;P:≤0.035%;S:≤0.035%

[0063] 1. Ladle baking

[0064] 1) Choose a manganese ore block with a particle size of 25-50mm, and the phosphorus and sulfur content of the manganese ore is less than 0.05%.

[0065] 2) Add 1000kg of manganese ore to the ladle. According to the calculation of 100 tons of steel, the actual amount of manganese ore added is 10kg / ton of steel.

[0066] 3) Ladle baking temperature is 1015°C, and the time to reach 1015°C is as long as 3 hours,

[0067] 4) During the transfer process after the ladle is baked, the top of the ladle is covered with a ladle cover;

[0068] 2. Converter operation

[0069] 1) The converter is loaded with 90t of molten iron, 10t of scrap steel, and the blowing oxygen supply intensity is 3.40Nm 3 / min·t, lime and other slagging materials are added during the blowing process, and the final slag alkalinity is 3.6,

[...

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Abstract

The invention provides a manganese-containing steel alloying process. The alloying process includes: 1) a step of baking a steel ladle, wherein manganese ore blocks having a particle size of 10-50 mm and a sulphur content smaller than 0.05% and a phosphorus content smaller than 0.05% are added into the steel ladle, addition and matching are performed according to the middle of the manganese content limit, the baking temperature is higher than 1000 DEG C, the baking time is longer than 2 h, and the steel ladle is covered with a steel ladle cover in a conveying process after baking; 2) a step of converter operation, wherein the tapping temperature is performed according to the middle limit and the upper limit, the temperature of the molten steel is 1685-1705 DEG C, the temperature of the molten steel in the steel ladle is guaranteed to be not less than 1670 DEG C, the carbon content in the end point is more than 0.08%, the slag quantity discharged from the converter is controlled, the thickness of the slag is smaller than 50 mm, and the operation of blowing argon to the bottom of the steel ladle is performed after the tapping step; and 3) a step of refining operation in an LF furnace, wherein strong stirring is adopted, the argon flow rate is not less than 250 NL/min, the temperature is controlled according to the target refining temperature upper limit, and other alloys are added to adjust the component of the molten steel so as to satisfy the requirements of the steel. The process is simple in operation, free of improvement of original equipment, and free of influence on other production working, and can significantly reduce the steelmaking cost. The yield of the manganese in the manganese ore can be higher than 90%.

Description

technical field [0001] The invention belongs to the technical field of smelting, and in particular relates to a steelmaking process using manganese ore alloying. Background technique [0002] Manganese is the main alloying element in steel materials, which plays an important role in improving the properties of steel. Usually, when alloying manganese elements in steelmaking, manganese-containing ferroalloys such as ferromanganese and ferrosilicon manganese are used for manganese alloying in the tapping or refining process. change. This alloying process using manganese-containing ferroalloys is very mature, and the recovery rate of manganese is high and stable, but manganese ore needs to be smelted into manganese-containing ferroalloys, but the process of manufacturing manganese-containing ferroalloys is a process of high energy consumption and high pollution. Lead to increased steelmaking production costs and environmental pollution. [0003] In response to the above shortc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/00C21C7/072
Inventor 尚德礼孙群吕春风康磊廖相巍倪翀奕于守巍齐志宇常桂华
Owner ANGANG STEEL CO LTD
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