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Continuous casting process for producing free-cutting steel through converter

A free-cutting steel and continuous casting technology, which is applied in the field of steel production, can solve the problems of fatigue and corrosion resistance reduction, transverse plasticity, poor toughness, and large difference in mechanical properties, etc., to improve center segregation and center porosity, and prevent crystallization Inter-cracks and central cracks, and the effect of increasing the central equiaxed crystal ratio

Pending Publication Date: 2022-05-06
NANJING IRON & STEEL CO LTD
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AI Technical Summary

Problems solved by technology

Generally, the machinability of steel increases with the increase of sulfur content in steel, but at the same time, the longitudinal and transverse mechanical properties of steel are greatly different, the transverse plasticity and toughness are poor, and the fatigue and corrosion resistance are also reduced.
[0003] In order to prevent the occurrence of intergranular cracks and central cracks in the continuous casting slab of free-cutting steel and improve the central segregation and looseness of the continuous casting slab, a weak cooling system is often used in continuous casting production. The above-mentioned defects of the billet

Method used

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  • Continuous casting process for producing free-cutting steel through converter
  • Continuous casting process for producing free-cutting steel through converter
  • Continuous casting process for producing free-cutting steel through converter

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Applied to a 100-ton converter, the composition content of the smelting end point is: C: 0.07%, Si: 0.06%, Mn: 1.50%, P: 0.0055%, S: 0.40%, O: 80ppm, and the balance is Fe and unavoidable impurities .

[0044] The continuous casting adopts 150*150mm section pouring, and the continuous casting parameters are as follows;

[0045] (1) Electromagnetic stirring (A*Hz): 250*2.0, improving core segregation and porosity inside the slab.

[0046] (2) Terminal stirring (A*Hz): 400*6.0.

[0047] (3) Superheat: 35°C.

[0048] (4) Pulling speed: Stable 2.2m / min, constant and fast pulling speed.

[0049] (5) Specific water volume of secondary cooling: weak cooling (0.75l / kg, foot roller water 7.0m 3 / h).

[0050] After testing, no obvious intergranular cracks and central cracks were found in the continuous casting slab. The central segregation rating was Class C 1.0, the central porosity was 1.0, and the central equiaxed grain rate was 25%.

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Abstract

The invention discloses a continuous casting process for producing free-cutting steel through a converter, and relates to the technical field of steel production, full protection pouring is adopted for continuous casting, long nozzle argon seal protection is adopted from a steel ladle to a tundish, submersed nozzle protection pouring is adopted from the tundish to a crystallizer, a covering agent is used for molten steel in the steel ladle and the tundish, and covering slag is used in the crystallizer; during pouring, a crystallizer is used for electromagnetic stirring, secondary cooling, vibration and tail end stirring parameters are controlled, and the casting speed of a continuous casting billet and the tundish molten steel temperature are controlled. By optimizing the continuous casting billet cooling process, the quality of the free-cutting steel can be effectively improved on the premise that the cost is not increased, and the rolling defects of the continuous casting billet are overcome.

Description

technical field [0001] The invention relates to the technical field of iron and steel production, in particular to a continuous casting process for producing free-cutting steel with a converter. Background technique [0002] Free-cutting steel refers to alloy steel in which a certain amount of free-cutting elements such as sulfur, phosphorus, lead, calcium, selenium, and tellurium are added to the steel to improve its machinability. For sulfur-containing free-cutting steel, a certain amount of sulfur is added to the steel to make sulfur, manganese and iron form manganese sulfide and iron sulfide inclusions. Such inclusions can interrupt the continuity of the base metal and promote chip breaking during cutting. Form a small and short crimp radius, which is easy to remove, reduces tool wear, reduces surface roughness, and improves tool life. Generally, the machinability of steel increases with the increase of sulfur content in steel, but at the same time, the longitudinal and...

Claims

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Application Information

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IPC IPC(8): B22D11/18B22D11/111B22D11/115B22D11/12B22D11/22C22C38/02C22C38/04C22C38/60
CPCB22D11/18B22D11/182B22D11/225B22D11/111B22D11/115B22D11/122B22D11/001C22C38/02C22C38/04C22C38/60
Inventor 周云
Owner NANJING IRON & STEEL CO LTD
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