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Oxygen converter steelmaking method

A technology of oxygen converter and oxygen lance, which is applied in the field of steelmaking to achieve the effects of increasing consumption, reducing oxygen consumption and reducing CO2 emissions

Inactive Publication Date: 2016-09-21
HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to provide an oxygen converter steelmaking method to solve the technical problem that the converter does not add slag flux during the smelting process, but adds sludge balls and limestone to partially replace the scrap steel smelting process

Method used

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Embodiment 1

[0021] Embodiment 1: A kind of oxygen converter steelmaking method

[0022] Loading system: Quantitative loading is adopted, with 91.7t of molten iron and 8.2t of scrap steel.

[0023] Oxygen supply system: The oxygen lance position (H / mm) is 1170-1680mm away from the metal liquid surface.

[0024] Slagging system: Single slag operation is adopted, and the quality of slagging materials added is: limestone 804kg, lime 1650kg, raw burnt dolomite 1253kg, sludge ball 817kg, iron ore 797kg. The slag-making material conforms to the second grade or above of the ferrous metallurgical industry standard of the People's Republic of China.

[0025] Temperature system: the smelted steel type is HPB300, the temperature in the smelting process is stable, and the tapping temperature is 1668°C.

[0026] End point system: See Table 1 for the mass percentages of the chemical composition of carbon, manganese, phosphorus, sulfur and other end points.

[0027] Table 1 Example 1 endpoint chemical...

Embodiment 2

[0029] Embodiment 2: A kind of oxygen converter steelmaking method

[0030] Loading system: Quantitative loading is adopted, with 91.1t of molten iron and 8.1t of scrap steel.

[0031] Oxygen supply system: The oxygen lance position (H / mm) is 1150-1660mm away from the metal liquid surface.

[0032] Slagging system: single slag operation is adopted, and the quality of slagging materials added is: limestone 796kg, lime 1626kg, raw burnt dolomite 1233kg, sludge ball 806kg, iron ore 806kg. The slag-making material conforms to the second grade or above of the ferrous metallurgical industry standard of the People's Republic of China.

[0033] Temperature system: the smelted steel type is HPB300, the temperature in the smelting process is stable, and the tapping temperature is 1668°C.

[0034] End point system: carbon, manganese, phosphorus, sulfur content End point chemical composition mass percentage is shown in Table 2.

[0035] Table 2 The chemical composition of the end point...

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Abstract

The invention relates to an oxygen converter steelmaking method. The process system of the method comprises: a loading system: 90-94% by weight of molten iron and 6-10% by weight of steel scrap are quantitatively loaded; an oxygen supply system: the lance position (H / mm) of an oxygen lance is 1100-1800mm far from a metal level; a slagging system: the added slagging material comprises 14-17% by weight of limestones, 28-34% by weight of lime, 21-25% by weight of unfired dolomite, 14-17% by weight of sludge balls and 14-17% by weight of iron ores by virtue of a single-slag operation; a temperature system: a tapping temperature Ttapping=Tliquid phase+deltaTdegree of superheat+deltaTprocess, wherein Ttapping is the tapping temperature, Tliquid phae is a liquid phase line temperature, deltaTdegree of superheat is a degree of superheat, and deltaTprocess is a process temperature drop from tapping to starting pouring; and a terminal point system: the steel comprises terminal point chemical components in percentages by mass: 0.06-0.20% of C, 0.05-0.35% of Mn, less than or equal to 0.035% of P, less than or equal to 0.035% of S and the balance of Fe and trace elements.

Description

technical field [0001] The invention belongs to the steelmaking technology and relates to an oxygen converter steelmaking method. technical background [0002] After Thomas invented the alkaline iron and steel smelting method, lime has been used as an alkaline slagging agent in steelmaking in the world. It is speculated that it was probably due to the fact that the air converter was used in steelmaking at that time, and the heat in the furnace was not rich enough to pay for the heat required for the decomposition of limestone. However, since the LD oxygen iron and steel smelting method was born, the heat in converter production has been abundant, and coolant has to be added during smelting. Commonly used coolants generally include steel scrap, pig iron block and ore, etc. When the temperature in the late stage of each furnace blowing is too high, ore, limestone, dolomite, etc. are often added to cool down. This method of operation shows that the steelmaking industry is mor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/32
CPCC21C5/32Y02P10/20
Inventor 田志国
Owner HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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