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Low-cost production method for container steel casting blanks

A container, low-cost technology, applied in the direction of improving process efficiency, manufacturing converters, etc., can solve the problems of low utilization rate of molten iron phosphorus, low surface crack rate of cast slabs, low cost, etc., to improve the utilization rate of molten iron phosphorus, The effect of improving the yield of molten steel and reducing the production cost

Inactive Publication Date: 2013-12-11
LIUZHOU IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method to solve the problem of low utilization rate of molten iron phosphorus in the production of high-phosphorus steel for containers at present, and the problems of pouring and billet quality under the condition of low nickel content in molten steel; provide a single slag less Slag smelting is a low-carbon and high-phosphorus converter smelting method. Under the premise that the carbon content of molten steel at the end of the converter meets the process requirements, the phosphorus content is stably controlled at 0.060~0.085%, and the consumption of slagging materials such as lime and light burning is controlled below 40kg per ton of steel. ;Provide a pouring process of high phosphorus, high copper and low nickel continuous casting slab, so that the continuous casting pours smoothly and the surface crack rate of the slab is low. The method for producing steel slabs for containers at low cost

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0103] Example 1: 120-ton system: 106.07 tons of molten iron, 15.61 tons of scrap steel, basicity control at the end of the converter: 1.64; add 18.4 kg of light-fired steel per ton and 8.2 kg of lime per ton of steel, and the oxygen supply intensity is 2.1 to 3.1 Nm 3 / min·t, blowing to oxygen consumption 9.8Nm 3 End the oxygen supply at / t and then blow the gun again to the end point; tap carbon (C) at the end point: 0.05%, tap phosphorus (P): 0.069%, tap temperature: 1652°C, for the cooling water of the continuous casting mold The flow rate is controlled, the flow rate of cooling water is controlled at 7.9m / s, the specific water volume of secondary cooling is 1.03L / kg, the temperature of the tundish is controlled at 1533-1539°C; the section of the casting machine is 1010mm, and the casting speed is controlled at 1.45m / min to obtain steel The chemical composition of the slab is:

[0104] .

Embodiment 2

[0105] Example 2: 120-ton system: 109.54 tons of molten iron, 10.23 tons of scrap steel, basicity control at the end of the converter: 2.31; add 21.6 kg of light-fired steel per ton and 9.8 kg of lime per ton of steel, and the oxygen supply intensity is 2.2 to 3.4 Nm 3 / min·t, blowing to oxygen consumption 7.1Nm 3End the oxygen supply at / t and blow again to the end point; tap carbon (C) at the end point: 0.07%, tap phosphorus (P): 0.081%, tap temperature: 1641°C, for continuous casting crystallizer cooling water The flow rate is controlled, the flow rate of cooling water is controlled at 8.3m / s, the specific water volume of secondary cooling is 0.72L / kg, the temperature of the tundish is controlled at 1529-1536°C; the section of the casting machine is 1400mm, and the casting speed is controlled at 1.12m / min to obtain steel The chemical composition of the slab is:

[0106] .

Embodiment 3

[0107] Example 3: 120-ton system: 107.54 tons of molten iron, 14.23 tons of scrap steel, basicity control at the end of the converter: 1.89; add 18.8 kg of light-fired steel per ton and 8.4 kg of lime per ton of steel, and the oxygen supply intensity is 2.1 to 3.3 Nm 3 / min·t, one oxygen supply blowing to the end point; the end point tapping carbon (C): 0.06%, tapping phosphorus (P): 0.072%, tapping temperature: 1649 ° C, the cooling water flow rate of the continuous casting crystallizer is adjusted Control, control the flow rate of cooling water to 8.8m / s, the specific water volume of secondary cooling to 0.74L / kg, the temperature of the tundish to be controlled at 1534-1542°C; the cross-section of the casting machine: 1350mm, and the casting speed to be controlled at 1.12m / min to obtain the cast slab The chemical composition is:

[0108] .

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Abstract

The invention discloses a low-cost production method for container steel casting blanks. The method is characterized in that a 100 to 120-ton system comprises molten iron (106-110 tons) and waste steel (12 tons); a 150 to 180-ton system comprises the molten iron (132-140 tons) and the waste steel (20 tons); the converter terminal alkalinity is controlled to be 1.6-2.5; a slag reservation operation is adopted; in the secondary cooling process, the 120-ton system has the specific water flow of 0.7-1.0 L / kg and the 150-ton system has the specific water flow of 0.7-1.1 L / kg; the tundish temperature is controlled to be 1529-1543 DEG C; and the drawing speed is controlled to be 1.45-1.10 m / min according to different cross sections (1000-1800 mm) of a casting machine. The method has the advantages that the molten steel yield is increased, the iron loss is reduced, the molten iron phosphorus utilization rate is increased, the production cost is greatly reduced, the consumption of slag-making materials is lowered, the environmental pressure is reduced, and the national energy-saving and emission-reducing requirements are met.

Description

technical field [0001] The invention relates to a production method of a steel casting slab for a container, in particular to a method for producing a steel casting slab for a container with a grade of SPA-H at low cost. Background technique [0002] Liuzhou Iron and Steel Co., Ltd. successfully developed SPA-H container board in 2010. After the outbreak of the financial crisis, affected by the market environment and the characteristics of weathering steel products, the benefits of container products have been poor. How to reduce the production cost of weathering steel products and ensure smooth production To improve the performance and product quality, to obtain greater economic benefits has become the research goal of each production plant. [0003] In traditional oxygen top-blown converter steelmaking, in order to remove impurities such as phosphorus and sulfur in steel, a large amount of lime and other slagging materials need to be added to form foam slag. During the oxy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/35B22D11/18
CPCY02P10/20
Inventor 覃强韦军尤邓深
Owner LIUZHOU IRON & STEEL
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