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Production method suitable for directly installing furnace and heating steel slab with high-quality carbon structure

A carbon structure and production method technology, applied in the field of iron and steel smelting, can solve the problems of reduction effect, uneven performance, large component segregation, etc., and achieve the effect of avoiding ineffective light pressing, good internal quality, and reducing segregation

Inactive Publication Date: 2018-09-07
中普(邯郸)钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The heating time is shortened after the high-temperature continuous casting slab is directly loaded, and the temperature can meet the rolling requirements. However, due to the large component segregation, the performance is uneven, so it takes a long time to soak to complete the component diffusion, which reduces the energy saving of direct loading heating rolling. Effect

Method used

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  • Production method suitable for directly installing furnace and heating steel slab with high-quality carbon structure
  • Production method suitable for directly installing furnace and heating steel slab with high-quality carbon structure
  • Production method suitable for directly installing furnace and heating steel slab with high-quality carbon structure

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Experimental program
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Effect test

Embodiment 1

[0036] Embodiment 1: be applicable to the production method (260mm * 2250mm section, as figure 2 shown).

[0037] The liquidus line of molten steel is 1494°C, and the composition mass percentage of steel is:

[0038] Table 1 45 steel composition control performance

[0039]

[0040] (1) Continuous casting long nozzle argon 26L, submerged nozzle and upper nozzle argon 5L;

[0041] (2) The nozzle insertion depth is 152mm;

[0042] (3) Reverse taper 0.95%;

[0043] (4) PY-HIGHC-260 secondary cooling secondary water meter, roll gap mode PY-HIGHC-260, amplitude 6.5mm, vibration frequency 142HZ;

[0044] (5) Dynamic reduction setting: the reduction amount of the 6th stage is 4.0mm; the reduction amount of the 7th and 8th stages is 2.5 and 2.0mm respectively; The diameter of the middle roller sleeve of the section guide roller is 2.0mm larger than the diameter of the roller sleeves on both sides;

[0045] (6) Crystallizer water temperature difference: 7.4°C, 6.8°C, 6.9°C, 7.6...

Embodiment 2

[0048] Embodiment 2: be applicable to the production method (260mm * 1500mm section, as image 3 shown).

[0049] The liquidus line of molten steel is 1494°C, and the composition mass percentage of steel is:

[0050] Table 2 45 steel composition control performance

[0051]

[0052] (1) Continuous casting long nozzle argon 24L; submerged nozzle and upper nozzle argon 4L.

[0053] (2) The nozzle insertion depth is 142mm.

[0054] (3) Reverse taper 1.0%.

[0055] (4) PY-HIGHC-260 secondary cooling secondary water meter, roll gap mode PY-HIGHC-260, amplitude 6.5mm, vibration frequency 142HZ;

[0056] (5) Reduction setting: the reduction amount of the 6th stage is 3.5mm; the 7th, 8th, and 9th stages are set as large reductions, and the reductions are 2.5 and 2.0mm respectively; the 9th, 10th, and 11th stages are set as light reductions , The reduction is 1.0, 1.0, 1.0mm; the size of the middle roller sleeve of the 10-section guide roller is 2.0mm larger than the roller sle...

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Abstract

The invention discloses a production method suitable for directly installing furnace and heating a steel slab with high-quality carbon structure. The method adopts front-end heavy reduction to carry out a casting blank tissue regulation and control technology, a soft reduction technology of solidification tail-end position uncertainty and a hot roll gap reconstruction technology on an existing continuous casting machine to produce a continuous casting slab with a high-quality high-grade carbon structure (45 steel ) after the slab is subjected to continuous casting, the slab is directly installed the furnace for hot rolling, composition segregation with a smaller slab can reduce the time of the component diffused uniformly in the furnace, so that the heating time of the slab is further shortened to meet the requirement for direct installing and heating of the slab; the expansion of the medium axis crystal area of the slab reduces the cohesion and segregation in 1 / 2 of thickness of inclusion and the component, so that the performance of the produced steel plate is uniform.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, in particular to a production method suitable for direct loading and heating of high-quality carbon structural steel slabs. Background technique [0002] Continuous casting is an important process in the production of medium and thick steel plates. The surface quality of the continuous casting slab has been greatly improved, and the surface quality can basically meet the production requirements, but the internal quality of the continuous casting slab still needs to be further improved. The internal quality of the continuous casting slab is the prerequisite for the production of high-quality medium-thick steel plates . Continuous casting slabs inevitably have composition segregation in the thickness direction, and a large number of low-melting inclusions and composition segregation during solidification condense at 1 / 2 of the thickness, and at the same time defects such as shrinka...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06B22D11/16
CPCC22C38/02B22D11/16C22C38/002C22C38/04C22C38/06
Inventor 郭龙鑫郭恩元杨云清石跃强石现英郭延生郭潇
Owner 中普(邯郸)钢铁有限公司
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