Production method applicable to directly installing and heating low-alloy high-strength structural steel plate billet

A low-alloy high-strength, 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 achieves the effect of avoiding ineffective light pressing, good internal quality, and reducing the degree of segregation

Inactive Publication Date: 2018-09-07
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 applicable to directly installing and heating low-alloy high-strength structural steel plate billet
  • Production method applicable to directly installing and heating low-alloy high-strength structural steel plate billet
  • Production method applicable to directly installing and heating low-alloy high-strength structural steel plate billet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1: the low-alloy high-strength structural steel Q500B slab production method (260mm * 2250mm section) that is suitable for direct heating, such as figure 2 shown.

[0037] The liquidus line of molten steel is 1516°C, and the composition mass percentage of steel is:

[0038] Table 1 Q500D component 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 153mm;

[0042] (3) Reverse taper 1.05%;

[0043] (4) Secondary cooling and secondary water meter PY_MEDC_260, roll gap mode PY_MEDC_260, amplitude 4.5mm, vibration frequency 157HZ;

[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...

Embodiment 2

[0048] Embodiment 2: the low-alloy high-strength structural steel Q500F slab production method (260mm * 1500mm section) that is suitable for direct heating, such as image 3 shown.

[0049] The liquidus line of molten steel is 1516°C, and the composition mass percentage of steel is:

[0050] Table 2 Q500F ingredient control performance

[0051]

[0052] (1) Continuous casting long nozzle argon 26L; submerged nozzle and upper nozzle argon 5L.

[0053] (2) The nozzle insertion depth is 144mm.

[0054] (3) Inverted taper 1.05%.

[0055] (4) Secondary cooling and secondary water meter PY_MEDC_260, roll gap mode PY_MEDC_260, amplitude 4.5mm, vibration frequency 157HZ;

[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 roll...

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PUM

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Abstract

The invention discloses a production method applicable to directly installing and heating a low-alloy high-strength structural steel plate billet. According to the method, high-quality, low-alloy andhigh-strength structural steel (Q500D, Q500E and Q500F) continuous casting plate billet produced by performing a cast billet structure adjusting and controlling technology, a soft press technology with the solidification tail end position uncertain and a hot roller seam remanufacturing technology under heavy reduction of the front end is adopted on an existing continuous casting machine, after continuous casting of the plate billet, direct furnace containing and heating rolling is performed, small component segregation of the plate billet can shorten the component homogenization time of the plate billet in a furnace, and therefore the plate billet heating time is shortened, and the direct installing and heating requirement of the plate billet is met; and due to expanding of an equiaxed zone in the plate billet, agglomeration and segregation of inclusions and components at a 1 / 2 thickness position are reduced, and a 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 directly heating low-alloy high-strength 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 shrinkage cavities and por...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06B22D11/16
CPCB22D11/16C22C38/02C22C38/04C22C38/06
Inventor 郭龙鑫郭恩元石跃强郭延生石现英杨云清陈建超
Owner HEBEI PUYANG IRON & STEEL
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