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Continuous casting production control method for super-large section heavy rail steel

A production control method and super-large cross-section technology, applied in the direction of manufacturing tools, casting equipment, casting melt containers, etc., to achieve the effects of optimizing solidification structure, high-level quality control, and improving compactness

Inactive Publication Date: 2018-03-13
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, some key specific content of the quality control equipment process for heavy rail billet shells with super large cross-section (320mm*410mm) is not covered.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] This embodiment is a steelmaking plant using the method invented by this equipment technology to produce ultra-large section (320mm*410) U71Mn heavy rail steel continuous casting billets. The specific implementation of the technology of the present invention is: adopting the tubular crystallizer equipment with a parabolic taper curve; the tubular crystallizer waterway has two inlets and two circuits; the cooling water volume of the crystallizer is 3625L / min, the water pressure is 0.85MPa; the crystallizer immersion nozzle adopts Double-sided holes, the side holes are inclined 15° downward, the nozzle outer diameter is φ95mm, the inner diameter is φ45mm, and the matching insertion depth is controlled at 108mm; the mold electric stirrer is installed at a position 620mm from the upper mouth of the mold (based on the middle of the mold electric stirrer height ); Mold electromagnetic stirring current intensity is 350A, stirring current frequency is 2.4Hz. The subsequent stage...

Embodiment 2

[0023] In this embodiment, a steelmaking plant uses the method invented by this equipment technology to produce ultra-large section (320mm*410) U75V heavy rail steel continuous casting billets. The specific implementation of the technology of the present invention is: adopting the tubular crystallizer equipment with a parabolic taper curve; the tubular crystallizer has two inlets and two circuits; the cooling water volume of the crystallizer is 3550L / min, and the water pressure is 0.80MPa; the crystallizer immersion nozzle adopts Double-sided holes, side holes inclined 15° downward, nozzle outer diameter φ95mm, inner diameter φ45mm, matching insertion depth is controlled at 100mm; mold electric stirrer is installed at a position 620mm away from the upper mouth of the mold (based on the middle of the mold electric stirrer height ); Crystallizer electromagnetic stirring current intensity 300A, stirring current frequency 2.4Hz. The subsequent stage of the mold is carried out befor...

Embodiment 3

[0026] This embodiment is a steelmaking plant using the method invented by this equipment technology to produce ultra-large section (320mm*410) U78CrV heavy rail steel continuous casting billets. The specific implementation of the technology of the present invention is: adopting the tubular crystallizer equipment with a parabolic taper curve; the tubular crystallizer has two inlets and two loops; the cooling water volume of the crystallizer is 3700L / min, the water pressure is 0.90MPa; the crystallizer immersion nozzle adopts Double-sided holes, the side holes are inclined 15° downward, the outer diameter of the nozzle is φ95mm, the inner diameter is φ45mm, and the matching insertion depth is controlled at 120mm; the mold electric stirrer is installed at a position 620mm from the upper mouth of the mold (based on the middle of the mold electric stirrer height ); Mould electromagnetic stirring current intensity is 400A, stirring current frequency is 2.4Hz. The subsequent stage of...

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Abstract

The invention discloses a continuous casting production control method for a super-large section heavy rail steel, and particularly relates to the continuous casting production control method in the field of ferrous metallurgy for the super-large section heavy rail steel. According to the continuous casting production control method for the large-section heavy rail steel, a parabolic taper curve type tubular mold is adopted, a cooling water pipeline is provided with two cooling water inlets and two cooling water outlets, a super-large section heavy rail steel mold adopts an immersion type water port, a double-side hole mode is adopted in the immersion type water port, the intensity of stirring currents ranges from 300-400A, the current frequency is 2.4Hz, the specific water flow of secondary cooling water is matched with the pulling rate at mold subsequent solidification section, and the solidification tail end is pressed down. According to the method, molten steel flow fields and solidification cooling of the mold are effectively controlled, a secondary cooling system is reasonably controlled on the basis, a force field is externally applied to a casting blank, the casting blank solidification structure is optimized, the segregation of solute elements is improved, and the compactness of the center of the casting blank is improved.

Description

Technical field [0001] The invention relates to a production control method for the continuous casting of super large section heavy rail steel, in particular to a production control method for the continuous casting of super large section heavy rail steel in the field of iron and steel metallurgy. Background technique [0002] Steel rail is the main component of railway track. In the process of railway transportation, it provides effective support and guidance for the locomotive and needs to withstand the huge vertical pressure from the wheels. Based on the development needs of my country's infrastructure construction, railway transportation is developing at a rapid pace, and is constantly becoming high-speed and heavy-duty. The size of steel rails is also gradually increasing. In order to reduce welded joints and ensure higher integrity of railway rails, the fixed length of large-sized rails is also increasing. Rolling large-size and long-length rails by using small-section cas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/18B22D11/22B22D41/50B22D11/115
CPCB22D11/18B22D11/115B22D11/22B22D41/50
Inventor 李红光陈天明郭华李扬洲
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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