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Method for controlling content of nitrogen in semi-steel smelted tire cord steel or hard wire steel

A cord steel and steel smelting technology, applied in the manufacture of converters, improvement of process efficiency, etc., can solve problems such as difficult nitrogen content, achieve the effect of improving product quality and broad application prospects

Active Publication Date: 2014-06-25
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, controlling the nitrogen content in molten steel during semi-steel smelting is more difficult than controlling the nitrogen content in molten iron

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A factory uses semi-steel after vanadium extraction as raw material to smelt cord steel 72A molten steel.

[0039] (1) The semi-steel is smelted in the converter, and the gas supply system of bottom blowing argon is adopted in the whole process of converter smelting, and the flow rate of argon blowing is 35m 3 / h, and control the final carbon content of the converter molten steel to 0.18% at one time through the carbon drawing process;

[0040] (2) During the tapping process of the converter, when the tapping amount reaches 1 / 5 of the total amount of molten steel in the converter, start to add deoxidized alloy and refining slag with a basicity of 1 to the ladle refining furnace, and when the tapping amount reaches the converter When 2 / 5 of the total amount of molten steel is completed, the amount of deoxidized alloy added is 5kg / t 钢 ferromanganese alloy and 2kg / t 钢 ferrosilicon alloy, the total amount of refining slag added is 5kg / t 钢 , the particle size of the refin...

Embodiment 2

[0046] A factory used semi-steel after vanadium extraction as raw material to smelt cord steel 82A molten steel.

[0047] (1) The semi-steel is smelted in the converter, and the gas supply system of bottom blowing argon is adopted in the whole process of converter smelting, and the flow rate of argon blowing is 35m 3 / h, and control the final carbon content of the converter molten steel to 0.08% at one time through the carbon drawing process;

[0048] (2) During the tapping process of the converter, when the tapping amount reaches 1 / 5 of the total amount of molten steel in the converter, start to add deoxidized alloy and refining slag with a basicity of 1 to the ladle refining furnace, and when the tapping amount reaches the converter When 2 / 5 of the total amount of molten steel is completed, the amount of deoxidized alloy added is 6kg / t 钢 ferromanganese alloy and 2.5kg / t 钢 ferrosilicon alloy, the total amount of refining slag added is 7kg / t 钢 , the particle size of the ref...

Embodiment 3

[0054] A factory uses semi-steel after vanadium extraction as raw material to smelt hard wire steel 72A molten steel.

[0055] (1) The semi-steel is smelted in the converter, and the gas supply system of bottom blowing argon is adopted in the whole process of converter smelting, and the flow rate of argon blowing is 30m 3 / h, and control the final carbon content of the converter molten steel to 0.05% at one time through the carbon drawing process;

[0056] (2) During the tapping process of the converter, when the tapping amount reaches 1 / 10 of the total amount of molten steel in the converter, start to add deoxidized alloy and refining slag with a basicity of 0.8 to the ladle refining furnace, and when the tapping amount reaches the converter When 1 / 5 of the total amount of molten steel is completed, the amount of deoxidized alloy added is 7kg / t 钢 ferromanganese alloy and 3kg / t钢 ferrosilicon alloy, the total amount of refining slag added is 4kg / t 钢 , the particle size of the...

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Abstract

The invention discloses a method for controlling the content of nitrogen in semi-steel smelted tire cord steel or hard wire steel. The method sequentially comprises the following steps: 1, smelting semi-steel in a converter, adopting a bottom-blow argon supply system in the whole converter smelting process, and controlling the final carbon content in molten steel of the converter at 0.05-0.20%; 2, adding a deoxidized alloy and a refined slag to a ladle refining furnace before the steel tapping amount reaches 1 / 5 of the total amount of the molten steel of the converter in the converter steel tapping process, and completing the addition of the deoxidized alloy and the refined slag before the steel tapping amount reaches 2 / 5 of the total amount of the molten steel of the converter, wherein the alkalinity of the refined slag is 0.8-1.2; 3, refining the molten steel in the ladle refining furnace, and adding the refined slag of 9-14kg / t of steel at the early refining stage; 4, carrying out vacuum cycle degassing refining of the molten steel; and 5, continuously casting the molten steel, adding a covering agent in the continuous casting process to completely cover the molten steel surfaces of continuous casting tundishes, and carrying out non-argon-blowing of the stoppers of the tundishes in the casting process.

Description

technical field [0001] The invention relates to the field of iron and steel metallurgy, in particular to a method for controlling the nitrogen content in cord steel or hard wire steel, in particular to a method for controlling the nitrogen content in cord steel or hard wire steel smelted from semi-steel. Background technique [0002] Nitrogen is generally regarded as an impurity element in steel, except for special steel types. Certain high-quality steels require strict control of nitrogen, for example, the nitrogen content of cord steel is required to be controlled below 60ppm. Nitrogen in cord steel or hard wire steel is a harmful element. Nitrogen combines with Ti or Al in the steel to form TiN or AlN, which weakens the grain boundary strength, changes the brittle zone of the steel, and makes the surface of the slab prone to cracks; Steel toughness, welding performance, toughness in thermal stress zone, improve steel brittleness. Cord steel is mainly used in industrial ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/30C21C7/10C21C7/076B22D11/18B22D11/111
CPCY02P10/20
Inventor 曾建华陈永张敏李清春冯远超杨森祥吴国荣陈靓曾耀先陈天明黄德胜张先胜
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP