LF refining dephosphorization production process for low-phosphorus low-carbon steel

A production process, low-carbon steel technology, applied in the direction of improving process efficiency, etc., can solve problems such as furnace lining erosion, high end temperature of converter, large temperature drop, etc., to reduce steelmaking costs, improve product quality, and improve deep processing such as stamping performance effect

Inactive Publication Date: 2014-07-23
TANGSHAN GUOFENG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Compared with large state-owned iron and steel enterprises such as Baosteel and Wuhan Iron and Steel, private steel enterprises in many places have a larger proportion of ordinary steel output, and have higher requirements for the life of the converter in order to maintain a stable and high output; In the production of low-phosphorus and low-carbon steel, the temperature drop in the production process is too large, the end temperature of the converter is high, and the lining is severely eroded, which affects the overall steelmaking production plan. , Under the condition of high-phosphorus molten iron, the stable development of low-phosphorus and low-carbon steel is a technological problem that needs to be solved in steelmaking

Method used

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  • LF refining dephosphorization production process for low-phosphorus low-carbon steel
  • LF refining dephosphorization production process for low-phosphorus low-carbon steel
  • LF refining dephosphorization production process for low-phosphorus low-carbon steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A low-phosphorus and low-carbon steel LF refining and dephosphorization production process, the steel output of the converter is 130 tons, the mass percentage of the chemical composition of the product is: C: 0.017%, Si: 0.006%, Mn: 0.19%, P: 0.008%, S: 0.01%, AL: 0.03%, the rest is Fe and unavoidable impurities. Including the following process steps:

[0029] (1) Converter smelting: smelting end point mass percentage C: 0.07%, molten steel [O] 468ppm;

[0030] Final slag basicity: R3.0-3.5, slag penetration throughout the smelting process, tapping temperature 1661°C;

[0031] Converter tapping requires "bare steel" tapping without adding any deoxidized alloy materials; after tapping 1 / 4, add refining slag 300kg / furnace, lime 200kg / furnace in batches, and bottom blow argon gas during tapping;

[0032] The mass percentage of the molten steel composition in the argon blowing station out of the converter is: C: 0.058, Si: 0.005%, Mn: 0.06%, P: 0.014%, S: 0.011%, and the ...

Embodiment 2

[0042] A low-phosphorus and low-carbon steel LF refining and dephosphorization production process, the converter steel output is 130 tons, the product chemical composition mass percentage is: C: 0.016%, Si: 0.006%, Mn: 0.19%, P: 0.006%, S: 0.009%, AL: 0.04%, the rest is Fe and unavoidable impurities. Including the following process steps:

[0043] (1) Converter smelting: smelting key mass percentage: C0.069%, molten steel [O] 592ppm;

[0044] Final slag basicity: R3.0-3.5, slag penetration throughout the smelting process, tapping temperature 1652°C;

[0045] Converter tapping requires "bare steel" tapping without adding any deoxidized alloy materials; after tapping 1 / 4, add refining slag 500kg / furnace, and lime 300kg / furnace in batches, and argon gas is blown at the bottom during tapping;

[0046] The composition mass percentage of molten steel in the argon blowing station of the converter is: C: 0.055%, Si: 0.008%, Mn: 0.063%, P: 0.012%, S: 0.010%, and the rest is Fe and un...

Embodiment 3

[0056]A low-phosphorus and low-carbon steel LF refining dephosphorization production process, the converter steel output is 130 tons, the product chemical composition mass percentage is: C: 0.017%, Si: 0.005%, Mn: 0.18%, P: 0.008%, S: 0.009%, AL: 0.02%, the rest is Fe and unavoidable impurities. Including the following process steps:

[0057] (1) Converter smelting: smelting end point mass percentage C: 0.055%, molten steel [O] 604ppm;

[0058] Final slag basicity: R3.0-3.5, slag penetration throughout the smelting process, tapping temperature 1664°C;

[0059] Converter tapping requires "bare steel" tapping without adding any deoxidized alloy materials; after tapping 1 / 4, add refining slag 300kg / furnace, lime 200kg / furnace in batches, and bottom blow argon gas during tapping;

[0060] The mass percentage of molten steel out of the converter is: C: 0.049%, Si: 0.005%, Mn: 0.06%, P: 0.010%, S: 0.011%, and the rest is Fe and unavoidable impurities;

[0061] (2) LF refining: LF...

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Abstract

Belonging to the technical field of smelting processes in the metallurgical industry, the invention relates to an LF refining dephosphorization production process for low-phosphorus low-carbon steel. According to a technical scheme adopted by the invention, the product comprises the following chemical components by mass: 0.01-0.03% of C, 0.15-0.25% of Mn, less than or equal to 0.015% of S, less than or equal to 0.015% of P, less than or equal to 0.03% of Si, 0.02-0.04% of AlS, and the balance Fe and inevitable impurities. The smelting process control is as the following that: during LF refining, lime is added in two batches in terms of 400-600kg / furnace, the argon flow rate is 200-300NL / min; the LF output molten steel temperature is 1610-1630DEG C; the RH vacuum treatment cycle is 17-22min; the output molten steel temperature is 1585-1600DEG C; and the tundish molten steel temperature is 1550-1570DEG C. The production process provided by the invention effectively reduces the steelmaking cost, and improves the subsequent stamping and other deep processing performance of the product.

Description

technical field [0001] The invention relates to a low-phosphorus and low-carbon steel LF refining dephosphorization production process, which belongs to the technical field of smelting processes in the metallurgical industry. Background technique [0002] In recent years, the national iron and steel industry has suffered large losses. Private steel enterprises in many places have increased their efforts to develop new products on the one hand, and on the other hand, have strengthened cost research. In particular, the pre-iron system has used low-grade Mine, or recycling of converter slag to enrich the phosphorus element cycle, resulting in the phosphorus content in hot metal is 0.13-0.15%, which remains high, making it difficult to smelt low-phosphorus and low-carbon steel. [0003] Compared with large state-owned iron and steel enterprises such as Baosteel and Wuhan Iron and Steel, private steel enterprises in many places have a larger proportion of ordinary steel output, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C33/04C21C7/00C21C7/064C21C7/072C21C7/10
CPCY02P10/20
Inventor 董建梁义会顾克井刘志兴孙学玉耿赛晓
Owner TANGSHAN GUOFENG IRON & STEEL
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