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High-uniform longitudinal-and-transverse toughness wide-width steel plate and TMCP process production method thereof

A production method and vertical and horizontal technology, which are applied in the production field of high-uniform vertical and horizontal toughness wide-width steel plates and their TMCP process, can solve the problems of long process, high energy consumption, supporting special equipment, etc., and achieve uniform performance and uniform texture distribution. , the effect of reducing the effect of the difference in horizontal and vertical deformation

Active Publication Date: 2019-07-12
SD STEEL RIZHAO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] To sum up, if large-thickness steel plate is produced by heat treatment process, there are practical problems such as long process, need for supporting special equipment, and high energy consumption. The production of extremely wide-sized steel plate needs hardware guarantees such as large-thickness billet and rolling mill with large rolling force, so there is an urgent need Development of a TMCP process production method for large-thickness and wide-width steel

Method used

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  • High-uniform longitudinal-and-transverse toughness wide-width steel plate and TMCP process production method thereof
  • High-uniform longitudinal-and-transverse toughness wide-width steel plate and TMCP process production method thereof
  • High-uniform longitudinal-and-transverse toughness wide-width steel plate and TMCP process production method thereof

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Experimental program
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Effect test

Embodiment 1

[0032] The chemical composition includes (by weight%): C: 0.08%, Si: 0.35%, Mn: 1.45%, Nb: 0.025%, Ti0.018%, Cr: 0.35%, Mo: 0.25%, Als: 0.035% , P: 0.012%, S: 0.003%, CEV: 0.44%, and the rest is Fe and unavoidable impurities. The 300mm×2300mm continuous casting slab is reheated to 1205°C for 5.5 hours in the furnace. After coming out of the furnace, enter the rough rolling mill for 3 passes of cross rolling in the high temperature zone, start rolling at 1140°C, and control the rolling speed at 1.8-2.2m / s. The rolling at this stage ends at 1100°C, and the thickness of the rolled piece is 210mm at this time; The steel billet is cooled below 1000°C, and continues to be widened by cross rolling for 2 passes to reach a steel plate with a rough width of more than 4100mm. At this time, the thickness of the rolled piece is 167mm, and the interval between rolling passes is more than 100 seconds; ℃ into the finish rolling mill at a rolling speed of 3-3.5m / s to quickly longitudinally rol...

Embodiment 2

[0034]The chemical composition includes (by weight%): C: 0.05%, Si: 0.20%, Mn: 1.52%, Nb: 0.055%, Ti0.025%, Cr: 0.25%, Mo: 0.20%, Als: 0.032% , P: 0.010%, S: 0.005%, CEV: 0.39%, and the rest is Fe and unavoidable impurities. The 300mm×2200mm continuous casting slab is reheated to 1220°C for 5.8 hours in the furnace. After being out of the furnace, enter the rough rolling mill for 2 passes of cross rolling in the high temperature zone, start rolling at 1120°C, and control the rolling speed at 1.2-1.8m / s. The rolling at this stage ends at 1080°C, and the thickness of the rolled piece is 225mm at this time; The steel billet is cooled to below 980°C, and continues to be widened by cross rolling for 2 passes to reach a steel plate with a rough width of more than 3600mm. At this time, the thickness of the rolled piece is 180mm, and the interval between rolling passes is more than 120 seconds; ℃ into the finish rolling mill at a rolling speed of 3.2-4m / s to quickly longitudinally rol...

Embodiment 3

[0036] The chemical composition includes (by weight%): C: 0.04%, Si: 0.50%, Mn: 1.20%, Nb: 0.070%, Ti0.010%, Cr: 0.40%, Mo: 0.10%, Als: 0.15% , P: 0.014%, S: 0.008%, CEV: 0.47%, and the rest is Fe and unavoidable impurities. The 270mm×2250mm continuous casting slab is reheated to 1180°C for 6.0 hours in the furnace. After being out of the furnace, enter the rough rolling mill for 4 passes of cross rolling in the high temperature zone, start rolling at 1150°C, and control the rolling speed at 1.0-1.6m / s. The rolling at this stage ends at 1110°C, and the thickness of the rolled piece is 200mm at this time; The steel billet is cooled to below 990°C, and continues to be widened by cross rolling for 4 passes to reach a steel plate with a rough width of more than 3800mm. At this time, the thickness of the rolled piece is 156mm, and the interval between rolling passes is more than 100 seconds; ℃ into the finish rolling mill at a rolling speed of 2.8-3.4m / s to quickly longitudinally r...

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Abstract

The invention relates to a high-uniform longitudinal-and-transverse toughness wide-width steel plate and a TMCP process production method thereof. A conventional-size continuous casting slab with ingredients reaching the requirement is reheated, and the heated continuous casting slab is rolled to have the final finished product thickness through manners of widening and longitudinal rolling in sequence. Through the optimized matching design of a heating system, the rolling temperature, the deformation amount in each stage, the gate interval time, the rolling speed and a cooling system, the effect of the rolling effect of a high temperature zone and a low temperature zone on original austenite grain refining and phase change promotion is sufficiently used, the type and form of a phase changetransformation product are reasonably controlled, and high-uniform longitudinal-and-transverse performance and online direct production of an accurate shape and size large thickness wide plate are achieved. The maximum thickness of the steel plate is 90 mm, the width of the steel plate is 3000 mm-4000 mm, the yield strength of the steel plate is 400 MPa-600 MPa, the tensile strength is 500 MPa-700 MPa, and the CVN (at -40 DEG C and in the longitudinal / transverse direction) is larger than and equal to 64 J.

Description

technical field [0001] The invention belongs to the technical field of medium-thick steel plate preparation, and in particular relates to a wide-width steel plate with high uniform longitudinal and transverse toughness and a TMCP production method thereof. Background technique [0002] In recent years, with the pace of domestic industrialization getting faster and faster, the scale is getting bigger and bigger, and some mechanical equipment and projects are developing in the direction of large-scale. In order to reduce welding costs, reduce weld seams and improve welding quality, steel plates are required The geometric size develops and expands in the direction of width and length. Therefore, in recent years, industries such as marine engineering equipment, construction machinery, coal mining machinery, large mining vehicles, bridges and steel structures have a strong demand for wide steel plates. At the same time, due to the advantages of the TMCP process combined with cont...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/38C22C38/26C22C38/28C22C38/22C22C38/06C21D8/02
CPCC21D8/0226C22C38/02C22C38/04C22C38/06C22C38/22C22C38/26C22C38/28C22C38/38
Inventor 胡淑娥王绍禄胡晓英王业勤刘熙章李灿明孙京波孔雅
Owner SD STEEL RIZHAO CO LTD
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