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Production method of quenched and tempered steel plate blank used for high-strength structure and applied to direct-assembly heating

A production method and technology for structure, which is applied in the field of direct loading and heating of quenched and tempered steel slabs for high-strength structures, can solve the problems of reducing effect, uneven performance, large composition segregation, etc., to avoid ineffective light reduction, internal quality Good, the effect of reducing segregation

Inactive Publication Date: 2018-11-06
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 of quenched and tempered steel plate blank used for high-strength structure and applied to direct-assembly heating
  • Production method of quenched and tempered steel plate blank used for high-strength structure and applied to direct-assembly heating
  • Production method of quenched and tempered steel plate blank used for high-strength structure and applied to direct-assembly heating

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Embodiment 1

[0037] Embodiment 1: be applicable to the production method of quenched and tempered steel Q800D slab (260mm * 2250mm section, such as figure 2 shown).

[0038] The liquidus line of molten steel is 1516°C, and the composition mass percentage of steel is:

[0039] Table 1 Q800D component control performance

[0040]

[0041] (1) Continuous casting long nozzle argon 23L, submerged nozzle and upper nozzle argon 3L;

[0042] (2) The nozzle insertion depth is 153mm;

[0043] (3) Reverse taper 1.05%;

[0044] (4) PY-PERI-260 secondary cooling secondary water meter, roll gap mode PY-PERI-260, amplitude 4.5mm, vibration frequency 157HZ;

[0045] (5) Dynamic reduction setting: the reduction amount of the 6th stage is 3.5mm; 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;

[0046] (6) Crystallizer water temperat...

Embodiment 2

[0049] Embodiment 2: be applicable to the production method of quenched and tempered steel Q800F slab (260mm * 1500mm section, such as image 3 shown).

[0050] The liquidus line of molten steel is 1516°C, and the composition mass percentage of steel is:

[0051] Table 2 Q800F ingredient control performance

[0052]

[0053] (1) Continuous casting long nozzle argon 24L; submerged nozzle and upper nozzle argon 4L.

[0054] (2) The nozzle insertion depth is 142mm.

[0055] (3) Inverted taper 1.05%.

[0056] (4) Secondary cooling and secondary water meter PY_MEDC_260, roll gap mode PY_MEDC_260, amplitude 4.5mm, vibration frequency 157HZ;

[0057] (5) Reduction setting: the reduction amount of the 6th stage is 3.0mm; 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 g...

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Abstract

The invention discloses a production method of a quenched and tempered steel plate blank used for a high-strength structure and applied to direct-assembly heating. According to the production method,the plate blank of high-quality high-strength quenched and tempered steel (Q800D, Q800E and Q800F) is cast continuously on an existing continuous casting machine by adopting the front-end heavy-reduction casting blank structure adjustment and control technology, the condensation tail-end uncertain-position soft reduction technology, and the hot-roll gap reconstruction technology; after being castcontinuously, the plate blank is directly fed into a furnace for being heated and rolled; through the relatively small composition segregation of the plate blank, the time of uniform composition of the plate blank in the furnace can be shortened, thereby further shortening the plate blank heating time and meeting the direct-assembly heating demand of the plate blank; through the expansion of an equiaxed crystal zone in the plate blank, the condensation and the segregation of inclusions and components at the one-half thickness can be reduced; and accordingly, the performance of a produced steelplate can be 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 directly heating a quenched and tempered steel slab for high-strength 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/16B22D11/12
CPCB22D11/16B22D11/1206
Inventor 郭龙鑫郭恩元杨云清石跃强石现英郭延生付中原
Owner 中普(邯郸)钢铁有限公司
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