A continuous casting process for medium-carbon structural steel with low-sulfur content directly in converter

A medium-thin slab continuous casting, low sulfur content technology, applied in the field of metallurgy, can solve problems such as inability to pour and product quality cannot meet requirements, achieve good product quality, solve nozzle nodules and product surface defects, and reduce costs.

Active Publication Date: 2021-12-28
TANGSHAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention solves the problem of nozzle nodulation during straight-up continuous casting of medium-carbon structural steel converter, which causes continuous casting failure and the problem that product quality cannot meet the requirements

Method used

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  • A continuous casting process for medium-carbon structural steel with low-sulfur content directly in converter
  • A continuous casting process for medium-carbon structural steel with low-sulfur content directly in converter

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Experimental program
Comparison scheme
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Embodiment 1

[0033] In this embodiment, the process of continuous casting of medium and thin slabs directly on the carbon structural steel converter includes the following steps:

[0034] (1) Hot metal pretreatment process: the temperature of hot metal before treatment is 1270°C, S: 0.032%; using the magnesium powder injection process, 4 kg / t of lime powder is added to the iron ladle in advance, and the S in hot metal after desulfurization: 0.009%, Remove the iron slag after desulfurization;

[0035] (2) Converter smelting process:

[0036] A. The ladle is required to use red envelopes continuously, and it is forbidden to place the first three furnaces and the furnace ladle for major repairs and spare ladles. The time for the ladle to be used is 50 minutes from the continuous casting stop to the converter tapping;

[0037] B. Converter smelting cycle, that is, from the beginning of iron loading to the completion of tapping is 27 minutes; the cycle of argon blowing treatment is 13 minutes;...

Embodiment 2

[0043] In this embodiment, the process of continuous casting of medium and thin slabs directly on the carbon structural steel converter includes the following steps:

[0044] (1) Hot metal pretreatment process: the temperature of hot metal before treatment is 1265 ° C, S: 0.030%; using the magnesium powder injection process, 6 kg / t steel lime powder is added in advance to the iron ladle, and S in hot metal after desulfurization: 0.007%, Remove the iron slag after desulfurization;

[0045] (2) Converter smelting process:

[0046] A. The ladle is required to use red envelopes continuously, and it is forbidden to place the first three furnaces and the furnace ladle for major repairs and spare ladles. The time for the used ladle from continuous casting to converter tapping is 45 minutes;

[0047] B. Converter smelting cycle, that is, 26 minutes from the beginning of iron loading to the completion of tapping; 11 minutes of argon blowing treatment cycle; 6 minutes of hanging bag ...

Embodiment 3

[0053] In this embodiment, the process of continuous casting of medium and thin slabs directly on the carbon structural steel converter includes the following steps:

[0054] (1) Hot metal pretreatment process: the temperature of hot metal before treatment is 1280°C, S: 0.025%; using the magnesium powder injection process, 3 kg / t steel lime powder is added in advance in the iron ladle, and S in hot metal after desulfurization: 0.006%, Remove the iron slag after desulfurization;

[0055] (2) Converter smelting process:

[0056] A. The ladle is required to use red envelopes continuously, and it is forbidden to place the first three furnaces and the furnace ladle for major repairs and spare ladles. The time for the ladle used is 54 minutes from the continuous casting stop to the converter tapping;

[0057] B. Converter smelting cycle, that is, 26 minutes from the beginning of iron loading to the completion of tapping; the argon blowing treatment cycle is 12 minutes; the hanging ...

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Abstract

The invention discloses a process for continuous casting of medium-carbon structural steel with low sulfur content directly on a medium-thin slab. The pretreatment of molten iron uses the process of spraying magnesium powder. Lime powder of 3-7kg / t steel is added in advance in the iron ladle to control The composition of the end point of the converter is: C≥0.06%, S≤0.012%, P≤0.022%, and the end point temperature is 1670~1680°C; during the tapping process, ferrosilicon is used for deoxidation, silicon blending, high carbon ferromanganese blending manganese, and reasonable feeding is controlled Sequence and ladle argon stirring intensity, so that the final S of molten steel is ≤0.008%; control the continuous casting casting speed at 1.6-1.8m / min, use argon blowing stopper rod and argon blowing nozzle, and control the argon flow rate at 3-6L / min. The invention realizes the continuous casting process of medium-carbon structural steel with low sulfur content by blowing argon into the converter and solves the technical problems of nodules and product surface defects in the casting process of the medium-thin slab continuous casting process. The products produced The quality is good and meets the standards and user requirements.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a continuous casting process of a low-sulfur medium-carbon structural steel converter directly above a medium-thin slab. Background technique [0002] Converter molten steel does not go through the LF refining straight up continuous casting process, which can greatly reduce the energy consumption and cost of steelmaking. In the conventional slab process, the continuous casting process of molten steel directly from the converter has been frequently reported. After the molten iron has been desulfurized, some domestic enterprises and most European enterprises use CAS treatment stations or argon blowing after the furnace to directly supply conventional slab continuous casting. . Qiangang and other units use CAS treatment station to smelt aluminum-killed steel. After the converter is tapped, the molten steel is hoisted to the CAS treatment station. After alloying and a...

Claims

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Application Information

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IPC IPC(8): C21C5/30C21C7/06C21C7/064C21C1/02C21C5/36B22D11/16
CPCC21C5/30C21C7/06C21C7/0645C21C1/025C21C5/36B22D11/16
Inventor 杨杰吴振刚李军明张军国单庆林张响王占国张涛梁娟
Owner TANGSHAN IRON & STEEL GROUP
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