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Production method suitable for direct charging and heating of steel plate blank for medium temperature pressure vessel

A technology of a pressure vessel and a production method, applied in the field of iron and steel smelting, can solve the problems of large component segregation, non-uniform performance, reducing effect, etc., and achieve the effect of reducing segregation, good internal quality, and avoiding ineffective light pressing

Inactive Publication Date: 2018-11-13
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 direct charging and heating of steel plate blank for medium temperature pressure vessel
  • Production method suitable for direct charging and heating of steel plate blank for medium temperature pressure vessel
  • Production method suitable for direct charging and heating of steel plate blank for medium temperature pressure vessel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0037] The liquidus line of molten steel is 1513°C, and the composition mass percentage of steel is:

[0038] Table 1 14Cr1MoR composition control performance

[0039]

[0040] (1) Continuous casting long nozzle argon 24L, submerged nozzle and upper nozzle argon 3L;

[0041] (2) The nozzle insertion depth is 154mm;

[0042] (3) Reverse taper 1.05%;

[0043] (4) Secondary cooling secondary water meter X PY-MEDC-260, roll gap mode PY-MEDC-260, amplitude 5.5mm, vibration frequency 152HZ;

[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: left 7.8°C, outside 6.7°C, inside 6.8°C, ...

Embodiment 2

[0048] Embodiment 2: be applicable to the production method of steel 14Cr1MoR slab (260mm * 1500mm section, as image 3 shown).

[0049] The liquidus line of molten steel is 1513°C, and the composition mass percentage of steel is:

[0050] Table 2 14Cr1MoR 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 141mm.

[0054] (3) Inverted taper 1.05%.

[0055] (4) Secondary cooling and secondary water meter PY-MEDC-260, roll gap mode PY-MEDC-260, amplitude 5.5mm, vibration frequency 152HZ;

[0056] (5) Reduction setting: the reduction amount of the 6th stage is 4.0mm; 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 guide roller is 2.0mm...

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PUM

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Abstract

The invention discloses a production method suitable for direct charging and heating of a steel plate blank for a medium temperature pressure vessel. The method is characterized in that a high-qualitysteel (14Cr1MoR) for the pressure container produced through a casting billet structure regulation technology, a solidification end position indetermination soft-reduction technology and a hot rollergap re-manufacturing technology under front end heavy reduction is adopted on an existing continuous casting machine for continuously casting the plate blank, the plate blank is continuously casted,and then is directly charged, heated and rolled, the small composition segregation of the plate blank can reduce the plate blank homogenization time in a furnace, the plate blank heating time can be reduced, the plate blank direct charging and heating needs are met, expansion of the equiaxed crystal area in the plate blank reduces agglomeration and segregation of inclusions and components on the 1 / 2 thickness, and the produced steel plate is uniform in property.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, in particular to a method for producing a steel slab suitable for direct loading and heating of medium-temperature pressure vessels. 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 a...

Claims

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Application Information

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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郭海冰
Owner 中普(邯郸)钢铁有限公司
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