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Production method of low-sulfur peritectic steel continuous casting round billet

A technology for continuous casting of round billets and production methods, which is applied to the improvement of process efficiency, furnace types, furnaces, etc., can solve the problems of easy nozzle flocculation, defects of peritectic steel, and difficulty in desulfurization in refining furnaces, so as to ensure surface quality, The effect of improving fluidity and reducing oxidation

Inactive Publication Date: 2020-08-11
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Purpose of the invention: the purpose of the present invention is to provide a production method for continuous casting of low-sulfur peritectic steel round slabs, which solves the difficulty of desulfurization in refining furnaces during continuous casting of existing low-sulfur peritectic steels, and the nozzle flocculation is easy to occur during casting. Prone to the problem of peritectic steel defects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The production method of low-sulfur peritectic steel continuous casting round billet includes the following process: scrap steel + hot metal hot charging - 100tEBT electric arc furnace smelting - 100tLF refining - 100tVD vacuum degassing - continuous casting Φ150mm round billet, of which:

[0019] (1) Use scrap steel and molten iron hot charging as raw materials, send 37 tons of scrap steel and 74 tons of molten iron to a 100tEBT electric arc furnace for smelting into molten steel, and the tapping temperature is 1640°C; When the concentration is less than 0.006%, the steel is tapped, and 119kg of aluminum shot is added to the molten steel for initial deoxidation; at the same time, 700kg of lime and 100kg of fluorite are added for slagging during the tapping process;

[0020] (2) Send the molten steel after preliminary deoxidation in step (1) to a 100tLF refining furnace for refining. During refining, add silicon carbide deoxidizer to the molten steel to carry out diffusi...

Embodiment 2

[0025] The production method of low-sulfur peritectic steel continuous casting round billet includes the following process scrap steel + hot metal hot charging - 100tEBT electric arc furnace smelting - 100tLF refining - 100tVD vacuum degassing - continuous casting Φ150mm round billet, of which:

[0026] (1) Use scrap steel and molten iron hot charging as raw materials, send scrap steel (40 tons) and molten iron (66 tons) to a 100tEBT electric arc furnace for smelting into molten steel, and the tapping temperature is 1628°C; during smelting, when the P in molten steel When the content of the element is less than 0.004%, the steel is tapped, and 100kg of aluminum shot is added to the molten steel for initial deoxidation; at the same time, 700kg of lime and 140kg of fluorite are added during the tapping process for slagging;

[0027] (2) Send the molten steel after preliminary deoxidation in step (1) to a 100tLF refining furnace for refining. During refining, add silicon carbide d...

Embodiment 3

[0032] The production method of low-sulfur peritectic steel continuous casting round billet includes the following process scrap steel + hot metal hot charging - 100tEBT electric arc furnace smelting - 100tLF refining - 100tVD vacuum degassing - continuous casting Φ150mm round billet, of which:

[0033] (1) Use scrap steel and molten iron hot charging as raw materials, send scrap steel (45 tons) and molten iron (63 tons) to a 100tEBT electric arc furnace for smelting into molten steel, and the tapping temperature is 1635°C; during smelting, when the P in molten steel When the content of the element is less than 0.007%, the steel is tapped, and 100kg of aluminum shot is added to the molten steel for initial deoxidation; at the same time, 710kg of lime and 160kg of fluorite are added during the tapping process for slagging;

[0034] (2) Send the molten steel after preliminary deoxidation in step (1) to a 100tLF refining furnace for refining. During refining, add silicon carbide d...

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Abstract

The invention discloses a production method of a low-sulfur peritectic steel continuous casting round billet. The production method comprises the following steps that by using scrap steel and molten iron hot charging as a raw material, a raw material is sent into an electric arc furnace to smelt into molten steel, aluminum shots are added into the molten steel to perform primary deoxidation duringtapping, and lime and fluorite are added to perform slagging; during refining, a silicon carbide deoxidizing agent is added into the molten steel for slag surface diffusion deoxidization, white slagis produced during refining, the content of S and Al in the obtained molten steel is controlled, then the molten steel enters a refining furnace for vacuum degassing treatment, and after vacuum degassing treatment, the chemical components of the molten steel are adjusted to be controlled within a preset range; and finally, continuously casting the molten steel into a round billet. The molten steelis effectively desulfurized, the oxidability of the molten steel is reduced, the purity of the molten steel is ensured, the fluidity of the molten steel is improved, smooth casting in the continuouscasting process is ensured, smooth production is ensured, the working efficiency is improved, and meanwhile the surface quality of round billets is effectively ensured.

Description

technical field [0001] The invention relates to a production method of a low-sulfur steel continuous casting round billet, in particular to a production method of a low-sulfur peritectic steel continuous casting round billet. Background technique [0002] Seamless steel pipe refers to a steel pipe that is made of a single piece of metal and has no seams on the surface. Seamless steel pipes are widely used, mainly used as petroleum geological drilling pipes, cracking pipes for petrochemical industry, boiler pipes, bearing pipes, and high-precision structural steel pipes for automobiles and aviation. Seamless steel pipes are made of round steel pipes. In the past, when the continuous casting technology was immature, it was mainly made by piercing tube blanks. With the improvement of continuous casting technology, it is now possible to directly use continuous casting round billets instead of tube billets to produce seamless steel pipes. The use of continuous casting round bi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C21C5/52C21C7/064C21C7/10C22C38/04C22C38/02C22C38/06C22C38/42C22C38/46C22C38/44C22C38/54C22C38/32C22C38/20C22C38/24C22C38/22C22C38/16C22C38/12C22C38/08C22C38/40
CPCC21C5/52C21C7/0056C21C7/064C21C7/10C22C33/04C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/16C22C38/20C22C38/22C22C38/24C22C38/32C22C38/40C22C38/42C22C38/44C22C38/46C22C38/54Y02P10/20
Inventor 赵张发李林李磊
Owner NANJING IRON & STEEL CO LTD
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