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Production method for improving strength and toughness of extra-thick steel plate based on TMCP process

An extra-thick steel plate and performance technology, which is applied in the field of preparation based on the TMCP process to improve the strength and toughness of extra-thick steel plates, can solve the problems of high production cost, difficulty in meeting high-performance steel, and low production efficiency, and achieve excellent performance and The effect of shape size, large strength and toughness margin, and uniform performance

Inactive Publication Date: 2018-07-06
SD STEEL RIZHAO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology is widely used in the production of low-strength low-alloy steel and ship plates, but it is difficult to meet the requirements of higher-strength grades and high-performance steels that prevent crack propagation.
[0007] In summary, there are practical problems in the production of extra-thick plates by heat treatment, such as long process, need for supporting special equipment, and large energy consumption. There is an urgent need to develop a short-process production process for extra-thick steel plates with excellent strength and toughness

Method used

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  • Production method for improving strength and toughness of extra-thick steel plate based on TMCP process
  • Production method for improving strength and toughness of extra-thick steel plate based on TMCP process
  • Production method for improving strength and toughness of extra-thick steel plate based on TMCP process

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preparation example Construction

[0028] A preparation method for improving the strength and toughness of extra-thick steel plates based on TMCP process, including the following steps:

[0029] a) Reheat the 250-300mm continuous casting slab with the required composition, the heating temperature is 1150-1200℃, and the heating time is 9-11min / cm;

[0030] b) The continuous casting billet is rolled into a semi-finished product: the heated rectangular continuous casting billet undergoes a rough rolling stage at a rolling temperature of 1080-1130°C, and the intermittent rolling temperature is controlled in the range of 950-980°C;

[0031] c) The semi-finished product is sent to the finishing rolling mill, and the rolling schedule of the finishing rolling stage is accurately controlled, and the final rolling temperature is 780-820℃;

[0032] d) The starting temperature of the primary cooling of the steel plate after rolling is greater than 760℃, the secondary cooling is controlled within the range of the ferrite transformat...

Embodiment 1

[0039] The 250mm continuous casting slab with the required composition is reheated to 1150°C for 4 hours in the furnace. After coming out of the furnace, it enters the rough rolling mill for the first stage of high-temperature rolling. The rolling is started at 1100°C. The rolling speed is controlled at 1.5-1.8m / s. After multiple passes of longitudinal rolling and widening to the required width, when the thickness of the rolled piece is reduced to When 160mm, control the steel rolling rhythm, when the temperature drops to 960℃, start intermittent rolling, and roll into 114mm semi-finished products in two passes. The interval between the control passes is more than 30 seconds; it is sent to the finishing mill for rapid rolling It is made into a 60mm steel plate with 15 seconds between passes, and the final rolling is finished at 810°C. After rolling, 790°C starts to cool to Ar3-40°C at a cooling rate of 3°C / s, and then cools to 400°C at a rapid cooling rate of 20°C / s. Then air-...

Embodiment 2

[0041] The 300mm continuous casting slab with the required composition is reheated to 1200°C for 5 hours in the furnace. After coming out of the furnace, it enters the rough rolling mill for the first stage of high temperature rolling. The rolling is started at 1120°C. The rolling speed is controlled at 0.7-1.2m / s. After multiple passes of longitudinal rolling and widening to the required width, when the thickness of the rolled piece is reduced to At 195mm, control the steel rolling rhythm, when the temperature drops to 980℃, start intermittent rolling, and roll into a 140mm semi-finished product in two passes. The interval between the control passes is more than 70 seconds; it is sent to the finishing mill for rapid rolling To 80mm steel plate, the interval between passes is 10 seconds, and the final rolling is guaranteed at 790℃. After rolling, 770°C starts to cool to Ar3-50°C at a cooling rate of 5°C / s, and then cools to 350°C at a rapid cooling rate of 30°C / s. Then air-coo...

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Abstract

The invention relates to a production method for improving the strength and toughness of an extra-thick steel plate based on a TMCP process. The production method comprises the steps that a continuouscasting slab with the composition meeting the requirements is reheated, and then a qualified product is directly produced through a controlled rolling and controlled cooling process. The reasonable combination of strength and toughness is comprehensively considered on the aspects of rolling and cooling schedule optimization, the original austenite grain size is fully refined, the austenite deformation accumulation is increased, and a reasonable cooling system is adopted to ensure that the proportion of the structure is constant, so that the technological potential of modern material processing is fully reflected, the effect of phase change control technological means such as controlled rolling and controlled cooling on the improvement of strengthening and toughening of steel is brought into play, and the high fracture toughness of the low alloy ultra-thick steel product produced by the TMCP technology is ensured. The method has the beneficial effects of being low in cost, short in flow, high in precision, simplified in process and easily realizing industrialized mass production.

Description

Technical field [0001] The invention belongs to the field of steel plate preparation, and particularly relates to a preparation method for improving the strength and toughness of extra-thick steel plates based on a TMCP process. Background technique [0002] In recent years, with the development of marine resources, marine engineering equipment and transportation have developed in the direction of large-scale development, and the high strength and thickening of structural materials have been promoted. From the perspective of ensuring the safety of the overall structure and preventing brittle damage, It is more necessary for steel to have higher fracture toughness values ​​and high fracture toughness, so that even if brittle cracks appear, they can stop their propagation and ensure the safety of structural components. [0003] The common methods to improve the strength and toughness of steel plates are mainly through grain refinement. Grain refinement is the only way to improve the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/02
CPCC21D8/0226
Inventor 胡淑娥李灿明杨建勋刘晓美侯东华韩启彪成小龙胡晓英孙京波孔雅
Owner SD STEEL RIZHAO CO LTD
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