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A kind of wide-width steel plate with high uniform longitudinal and transverse toughness and TMCP process production method thereof

A vertically and horizontally uniform technology, applied in the field of high uniform vertically and laterally toughness wide steel plate and its TMCP process production, can solve the problems of supporting special equipment, large energy consumption, long process, etc., to meet the requirements of mass production and surplus strength and toughness The effect of large quantity and easy welding

Active Publication Date: 2021-03-16
SD STEEL RIZHAO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • A kind of wide-width steel plate with high uniform longitudinal and transverse toughness and TMCP process production method thereof
  • A kind of wide-width steel plate with high uniform longitudinal and transverse toughness and TMCP process production method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The chemical compositions were included (in wt%): C: 0.08%, Si: 0.35%, Mn: 1.45%, Nb: 0.025%, Ti 0.018%, Cr: 0.35%, Mo: 0.25%, Als: 0.035% , P: 0.012%, S: 0.003%, CEV: 0.44%, the rest is Fe and inevitable impurities 300mm × 2300mm continuous casting billet reheated to 1205 ℃, in the furnace for 5.5 hours. After being released from the furnace, it enters the rough rolling mill for 3 passes of cross-rolling in the high temperature area, and starts rolling at 1140 °C. The steel billet is cooled to below 1000°C, and the cross-rolling method is continued to widen for 2 passes to reach the gross width of the steel plate above 4100mm. At this time, the thickness of the rolled piece is 167mm, and the rolling pass interval is more than 100 seconds; The temperature is sent to the finishing mill at a rolling speed of 3-3.5m / s to form a 85mm steel plate. After rolling, the water cooling temperature was controlled at 710°C, and the cooling rate was 25°C / s to 300°C. Then, the water...

Embodiment 2

[0034]The chemical compositions were included (in wt%): C: 0.05%, Si: 0.20%, Mn: 1.52%, Nb: 0.055%, Ti 0.025%, Cr: 0.25%, Mo: 0.20%, Als: 0.032% , P: 0.010%, S: 0.005%, CEV: 0.39%, the rest is Fe and unavoidable impurities 300mm × 2200mm continuous casting billet reheated to 1220 ° C, in the furnace for 5.8 hours. After being released from the furnace, it enters the rough rolling mill for 2 passes of cross-rolling in the high temperature area, starts rolling at 1120 °C, and controls 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; The steel billet is cooled to below 980°C, and the cross-rolling method is continued to widen for 2 passes to reach the gross width of the steel plate above 3600mm. At this time, the thickness of the rolled piece is 180mm, and the rolling pass interval is more than 120 seconds; The temperature is sent to the finishing mill at a rolling speed of 3.2-4m / s to form a 90mm steel pl...

Embodiment 3

[0036] The chemical compositions are included (in wt%): C: 0.04%, Si: 0.50%, Mn: 1.20%, Nb: 0.070%, Ti 0.010%, Cr: 0.40%, Mo: 0.10%, Als: 0.15% , P: 0.014%, S: 0.008%, CEV: 0.47%, the rest is Fe and inevitable impurities 270mm × 2250mm continuous casting slab reheated to 1180 ℃, in the furnace for 6.0 hours. After being released from the furnace, it enters the rough rolling mill for 4 passes of cross-rolling in the high temperature area, and starts rolling at 1150 °C. The billet is cooled to below 990°C, and the cross-rolling method is continued to widen 4 passes to reach the gross width of the steel plate above 3800mm. At this time, the thickness of the rolled piece is 156mm, and the rolling pass interval is more than 100 seconds; The temperature is sent to the finishing mill at a rolling speed of 2.8-3.4m / s to form a 80mm steel plate. After rolling, the water cooling temperature was controlled at 730°C, and cooled to 340°C at a rapid cooling rate of 28°C / s. Then, the water...

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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 high-uniform longitudinal and transverse toughness wide-width steel plate and a TMCP process production method thereof. Background technique [0002] In recent years, as the pace of domestic industrialization is getting faster and faster, the scale is getting bigger and bigger, some mechanical equipment and projects are developing in the direction of large-scale. In order to reduce the welding cost, reduce the welding seam and improve the welding quality, the steel plate is required to be welded. The geometric dimensions are developing and expanding in the direction of width and length. Therefore, in recent years, industries such as marine engineering equipment, construction machinery, coal mining machinery, large mining trucks, bridges and steel structures have a strong demand for wide-width steel plates. At the same time, due to the ad...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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