Smelting method of steel with high phosphorus content

A high-phosphorus-content steel and smelting method technology, applied in the manufacture of converters, etc., can solve the problems of increasing smelting costs and wasting resources, and achieve the effects of increasing phosphorus content, reducing consumption, and increasing FeO content

Active Publication Date: 2015-01-07
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to ensure the phosphorus content requirements of the steel, a large amount of phosphorus-iron alloy had to be added to the molten steel for phosphorus alloying. The conventional process failed to make full use of the phosphorus resources in the molten iron, so that most of the phosphorus in the molten iron was removed during the converter blowing process. , and then add ferrophosphorus for alloying, which wastes resources and increases smelting costs

Method used

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  • Smelting method of steel with high phosphorus content

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A 210-ton top-bottom combined blowing converter is used for smelting, and the specific steps are:

[0037] S1: Put the hot metal from the blast furnace into the converter, and add 15t of steel scrap at the same time. The mass percentages of the hot metal are C: 4.30%, Si: 0.35%, Mn: 0.21%, P: 0.10%.

[0038] S2: The blowing oxygen lance position and oxygen supply intensity are controlled as follows in the converter smelting process: at the stage of oxygen supply 0-20%, the oxygen supply intensity is controlled to 3.3Nm 3 / (min*t), the gun position is controlled at 2300mm; at the stage of oxygen supply 20-40%, the oxygen supply intensity is controlled at 2.9Nm 3 / (min*t), the gun position is controlled at 2500mm; at the stage of oxygen supply 40-90%, the oxygen supply intensity is controlled at 3.2Nm 3 / (min*t), the gun position is controlled at 1800mm; at the stage of 90-100% oxygen supply, the oxygen supply intensity is controlled at 3.2Nm 3 / (min*t), gun position co...

Embodiment 2

[0043] A 210-ton top-bottom combined blowing converter is used for smelting, and the specific steps are:

[0044] S1: Put the hot metal from the blast furnace into the converter, and add 15t of steel scrap at the same time. The mass percentages of the hot metal are C: 4.20%, Si: 0.30%, Mn: 0.14%, P: 0.08%.

[0045] S2: The blowing oxygen lance position and oxygen supply intensity are controlled as follows in the converter smelting process: at the stage of oxygen supply 0-20%, the oxygen supply intensity is controlled at 3.0Nm 3 / (min*t), the gun position is controlled at 2200mm; at the stage of oxygen supply 20-40%, the oxygen supply intensity is controlled at 2.8Nm 3 / (min*t), the gun position is controlled at 2450mm; the oxygen supply intensity is controlled at 3.0Nm at the stage of 40-90% oxygen supply 3 / (min*t), the gun position is controlled at 1600mm; at the stage of oxygen supply 90-100%, the oxygen supply intensity is controlled at 3.0Nm 3 / (min*t), gun position con...

Embodiment 3

[0050] A 210-ton top-bottom combined blowing converter is used for smelting, and the specific steps are:

[0051] S1: Put the hot metal from the blast furnace into the converter, and add 15t of steel scrap at the same time. The mass percentages of the hot metal are C: 4.40%, Si: 0.40%, Mn: 0.25%, P: 0.20%.

[0052] S2: The blowing oxygen lance position and oxygen supply intensity are controlled as follows in the converter smelting process: at the stage of oxygen supply 0-20%, the oxygen supply intensity is controlled at 3.5Nm 3 / (min*t), the gun position is controlled at 2400mm; at the stage of oxygen supply 20-40%, the oxygen supply intensity is controlled at 3.0Nm 3 / (min*t), the gun position is controlled at 2650mm; at the stage of oxygen supply 40-90%, the oxygen supply intensity is controlled at 3.5Nm 3 / (min*t), the gun position is controlled at 2000mm; at the stage of oxygen supply 90-100%, the oxygen supply intensity is controlled at 3.5Nm 3 / (min*t), gun position co...

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Abstract

The invention relates to a smelting method of steel with high phosphorus content. The smelting method is suitable for a converter of 180-250t. The smelting method comprises the following steps: in the converter blowing process, adjusting the oxygen lance position and the oxygen supply strength according to the oxygen supply amount; and carrying out endpoint control on the converter, wherein the endpoint control comprises the following steps: on the basis of the percentage by mass, controlling MgO to be 15-18%, FeO to be 9%-12% and endpoint phosphorus to be 0.030%-0.070%, and controlling the alkalinity of slag at the endpoint to be 2.0-2.5. According to the smelting method, the endpoint phosphorus content of the converter can be increased, consumption of ferro-phosphorus alloy is reduced, and on the basis of the percentage by mass, the method is suitable for smelting the grade of steel, of which the phosphorus content in a finished product is greater than or equal to 0.070%.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a method for smelting steel with high phosphorus content. Background technique [0002] The composition system of weathering steel mainly includes Cr-Ni-Cu-P system and Cr-Ni-Cu system. Among the elements such as Cr, Ni, Cu, P and Si that affect weather resistance, P is the most economical and effective. A small amount of P can greatly improve the weather resistance of steel. Therefore, in weather-resistant steel such as containers, railway vehicles, bridges, power towers, and cement mixing tanks, controlling the higher phosphorus content is conducive to ensuring its excellent weather resistance and weldability. . [0003] In the conventional process, due to the high oxidative atmosphere of the converter, the phosphorus element is easily oxidized. At the same time, in order to protect the furnace lining, the slag with high alkalinity is generally used for control. Generally...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/30C21C5/36
Inventor 李海波赵东伟高攀包春林朱国森刘锟王志鹏刘风刚吕成洵姜仁波赵晓东闵常杰
Owner SHOUGANG CORPORATION
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