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Method for producing constructional steel plate blank suitable for direct mounting and heating and high-strength ship

A production method and steel slab technology, applied in the field of structural steel slabs for direct loading and heating of high-strength hulls, can solve the problems of reducing effect, uneven performance, large composition segregation, etc., to avoid ineffective light pressing and good internal quality , to reduce the effect of 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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  • Method for producing constructional steel plate blank suitable for direct mounting and heating and high-strength ship
  • Method for producing constructional steel plate blank suitable for direct mounting and heating and high-strength ship
  • Method for producing constructional steel plate blank suitable for direct mounting and heating and high-strength ship

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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) of the structural steel A36 slab of direct loading heating high-strength hull, as figure 2 shown.

[0037] The liquidus line of molten steel is 1515°C, and the composition mass percentage of steel is:

[0038] Table 1 A36 Component Control Achievements

[0039]

[0040] (1) Continuous casting long nozzle argon 26L, submerged nozzle and upper nozzle argon 4L;

[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 5.8mm, vibration frequency 151HZ;

[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;

[004...

Embodiment 2

[0048] Embodiment 2: be applicable to the production method (260mm * 1500mm section) of the structural steel E36 slab of high-strength ship hull of heating directly, as image 3 shown.

[0049] The liquidus line of molten steel is 1515°C, and the composition mass percentage of steel is:

[0050] Table 2 E36 component 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 146mm.

[0054] (3) Inverted taper 1.05%.

[0055] (4) Secondary cooling and secondary water meter PY_MEDC_260, roll gap mode PY_MEDC_260, amplitude 5.8mm, vibration frequency 151HZ;

[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 rol...

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Abstract

The invention discloses a method for producing a constructional steel plate blank suitable for direct mounting and heating and a high-strength ship. According to the method, a constructional steel (A36, D36 and E36) continuous plate blank for the high-quality high-strength ship is produced on an existing continuous casting machine through the casting blank structure regulating and controlling technology, the solidification tail end position indetermination light reduction technology and the hot roll gap rebuilding technology in a front end high reduction manner, the plate blank is directly subjected to direct furnace loading heating rolling after being subjected to continuous casting, the in-furnace ingredient balancing time of the plate blank can be shortened through small ingredient segregation of the plate blank, and therefore the plate blank heating time is shortened, and the direct mounting heating requirement of the plate blank is met. Indetermination and segregation of occludedforeign substances and ingredients at the 1 / 2 thickness are reduced through expansion of an equiaxed zone in the plate blank, and a produced steel plate is even in performance.

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 structural steel slabs for high-strength hulls. 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 shr...

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李子磊
Owner HEBEI PUYANG IRON & STEEL
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