Method for smelting weather resistant steel through high-phosphorus-content steel discharging by converter

Abstract

The invention relates to a method for smelting weather resistant steel through high-phosphorus-content steel discharging by a converter. The method comprises the steps of adding waste steel liquor which is treated by KR desulfuration into the converter in a blending manner; performing slag retaining and slag making operations in the converter: retaining 3-5 tons of furnace slag of the last converter, and making slag only through light-roasted dolomite; in a converter blowing process, lifting an oxygen gun to a high position after the oxygen gun is ignited, quickly reducing the position of the oxygen gun step by step after a gas mixing stage, adding roasted dolomite and ores for cooling in the later stage of oxygen blowing, and quickly pulling carbons at the low gun position in the later stage of blowing; controlling an end point of the converter to discharge the steel. According to the method, auxiliary material consumption of the converter can be reduced, the phosphorus content of the end point of the converter is increased, the phosphorus iron consumption is alleviated, the final slag TFe content of the converter is reduced, and the iron loss in the converter blowing process is relieved.

Description

technical field

[0001] The invention relates to the technical field of converter steelmaking, in particular to a method for smelting weather-resistant steel by tapping high-phosphorus steel in a converter. Background technique

[0002] Weathering steel, also known as atmospheric corrosion-resistant steel, is a type of low-alloy high-strength steel with good corrosion resistance in the atmosphere, and its corrosion resistance is 5 to 6 times that of ordinary carbon steel. Weathering steel is widely used in the manufacture of structural parts such as containers, railway vehicles, and bridges. With the continuous development of my country's railway transportation, road transportation and shipping, the demand for containers and railway vehicles has increased, and the production of phosphorus-containing weathering steel has a good market prospect. At present, my country mainly develops weathering steel mainly based on Cu-P-Cr-Ni.

[0003] P in molten iron is a harmful element f...

Examples

Embodiment

[0033] To produce 10 furnaces of phosphorus-containing weathering steel, the same dephosphorization converter is used for continuous smelting, and the previous furnace smelting only dephosphorizes but does not decarburize.

[0034] Steel scrap is added to the iron converter, and the molten iron is desulfurized by KR and then mixed into the converter; 3-5 tons of slag from the previous furnace is retained, and 4-6 tons of light-burned dolomite is added within 2 minutes before blowing to form slag, and the amount of oxygen blowing in the middle and late stages of blowing reaches When 70%-80%, add raw burnt dolomite and ore to cool down, the ratio of ore and raw burnt dolomite is 1:1, and the total amount is within 8 tons; the blowing gun position of the converter blowing is 2.5m, and the gun is lowered five times , the terminal gun position is 1.6m; the steel is tapped after the converter terminal is controlled. Among them, the blowing process oxygen lance position diagram can b...

technical field

[0001] The invention relates to the technical field of converter steelmaking, in particular to a method for smelting weather-resistant steel by tapping high-phosphorus steel in a converter. Background technique

[0002] Weathering steel, also known as atmospheric corrosion-resistant steel, is a type of low-alloy high-strength steel with good corrosion resistance in the atmosphere, and its corrosion resistance is 5 to 6 times that of ordinary carbon steel. Weathering steel is widely used in the manufacture of structural parts such as containers, railway vehicles, and bridges. With the continuous development of my country's railway transportation, road transportation and shipping, the demand for containers and railway vehicles has increased, and the production of phosphorus-containing weathering steel has a good market prospect. At present, my country mainly develops weathering steel mainly based on Cu-P-Cr-Ni.

[0003] P in molten iron is a harmful element f...

Examples

Embodiment

[0033] To produce 10 furnaces of phosphorus-containing weathering steel, the same dephosphorization converter is used for continuous smelting, and the previous furnace smelting only dephosphorizes but does not decarburize.

[0034] Steel scrap is added to the iron converter, and the molten iron is desulfurized by KR and then mixed into the converter; 3-5 tons of slag from the previous furnace is retained, and 4-6 tons of light-burned dolomite is added within 2 minutes before blowing to form slag, and the amount of oxygen blowing in the middle and late stages of blowing reaches When 70%-80%, add raw burnt dolomite and ore to cool down, the ratio of ore and raw burnt dolomite is 1:1, and the total amount is within 8 tons; the blowing gun position of the converter blowing is 2.5m, and the gun is lowered five times , the terminal gun position is 1.6m; the steel is tapped after the converter terminal is controlled. Among them, the blowing process oxygen lance position diagram can b...

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