Production method suitable for directly charged and heated plate slab for high-rise building structure

A production method and high-rise building technology, applied in the field of iron and steel smelting, can solve the problems of reducing effect, uneven performance, large component segregation, etc., and achieve the effects of avoiding invalid light reduction, good internal quality, and reducing segregation

Inactive Publication Date: 2018-11-13
HEBEI PUYANG IRON & STEEL
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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 charged and heated plate slab for high-rise building structure
  • Production method suitable for directly charged and heated plate slab for high-rise building structure
  • Production method suitable for directly charged and heated plate slab for high-rise building structure

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Experimental program
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Effect test

Embodiment 1

[0035] Embodiment 1: be applicable to the production method (260mm * 2250mm section) of steel Q345GJB slab of direct packing heating high-rise building structure, as figure 2 shown.

[0036] The liquidus line of molten steel is 1511°C, and the composition mass percentage of steel is:

[0037] Table 1 Q345GJB component control performance

[0038]

[0039] (1) Continuous casting long nozzle argon 26L, submerged nozzle and upper nozzle argon 5L;

[0040] (2) The nozzle insertion depth is 152mm;

[0041] (3) Reverse taper 0.95%;

[0042] (4) Secondary cooling and secondary water meter PY_MEDC_260, roll gap mode PY_MEDC_260, amplitude 5.8mm, vibration frequency 151HZ;

[0043] (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;

[0...

Embodiment 2

[0047] Embodiment 2: be applicable to the production method (260mm * 1500mm section) of steel Q345GJE slab of direct-pack heating high-rise building structure, as image 3 shown.

[0048] The liquidus line of molten steel is 1511°C, and the composition mass percentage of steel is:

[0049] Table 2 Q345GJE component control performance

[0050]

[0051] (1) Continuous casting long nozzle argon 26L; submerged nozzle and upper nozzle argon 5L.

[0052] (2) The nozzle insertion depth is 142mm.

[0053] (3) Reverse taper 1.0%.

[0054] (4) Secondary cooling and secondary water meter PY_MEDC_260, roll gap mode PY_MEDC_260, amplitude 5.8mm, vibration frequency 151HZ;

[0055] (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 ...

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Abstract

The invention discloses a production method suitable for a directly charged and heated plate slab for a high-rise building structure. The method comprises the steps of continuously casting a slab by adopting high quality high-rise building structural steel (Q345GJB, Q345GJC, Q345GJD and Q345GJE) produced by means of a front end large reduction casting blank tissue regulating technique, a solidification end position indeterminate light reduction technique and a hot roll gap reconstructive technique based on an existing continuous casting machine and directly charging a furnace to be heated androlled after continuous casting the slab, wherein the heterogeneous component time of the slab in the furnace can be shortened as a result of relative small composition segregation of the slab, so that the slab heating time is shortened then and the demand on direct charging and heating the slab is met. Agglomeration and segregation of occluded foreign substances and components at 1 / 2 thickness are reduced as an isometric crystal region in the slab is expanded, and the produced steel plate is uniform in performance.

Description

technical field [0001] The invention relates to the field of iron and steel smelting, in particular to a production method suitable for direct loading and heating of steel slabs for high-rise building structures. 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 shrinkage cavi...

Claims

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Application Information

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IPC IPC(8): B22D11/16B22D11/12
CPCB22D11/1206B22D11/16
Inventor 郭龙鑫郭恩元杨云清石跃强郭延生石现英刘柱王中山袁君张学慧
Owner HEBEI PUYANG IRON & STEEL
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