High-uniformity steel plate with super-thick structure and manufacturing method thereof

A technology for uniformity and structure, applied in the field of high-uniformity and ultra-thick structural steel plates and their manufacturing, can solve the problems of low yield, high cost and unfavorable mass production, and achieve high yield, ensure uniformity of temperature structure, The effect of refining the grains of the internal structure

Active Publication Date: 2019-10-08
WUHAN IRON & STEEL GRP ECHENG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to propose a high-uniformity ultra-thick structural steel plate and its manufacturing method, to solve the problem that the existing ultra-thick steel plate is produced by die casting and normalizing process, the yield is low, and a higher temperature is required And long-term normalizing heat treatment, resulting in high cost is not conducive to the problem of mass production, a new method of rolling and cooling process to produce ultra-thick steel plates is provided, that is, online temperature-controlled rolling, staged cooling, and necessary The heat treatment process realizes the production of ultra-thick steel plates with a thickness specification of 80-150mm and high uniformity in the thickness direction. Ensure excellent uniformity of structure and performance, and ensure the safety of steel structures

Method used

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  • High-uniformity steel plate with super-thick structure and manufacturing method thereof
  • High-uniformity steel plate with super-thick structure and manufacturing method thereof
  • High-uniformity steel plate with super-thick structure and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Table 1 The composition of steel billets used in Example 1, wt%

[0060]

[0061] The thickness of the billet is 250mm, the heating temperature is 1193°C, and the soaking time is 45min; the starting rolling temperature in the rough rolling stage is 1176°C, the rolling passes are 6, the final rolling temperature is 1148°C, the waiting temperature is 140mm, and after cooling to 870°C, enter The heat preservation device is kept warm for 5 minutes; the starting temperature of the finishing rolling stage is 865°C, the finish rolling temperature is 857°C, and the thickness of the finished product is 80mm; air cooling to 780°C enters the online heat preservation and heating device, and after holding for 5 minutes, the gradient laminar flow cooling method is adopted. 5°C / s, cooling to 750°C, then cooling for the second time after standing still for 30s, the cooling rate is 5°C / s, cooling to 720°C, then standing still for 40s, and then cooling for the third time, the cooling r...

Embodiment 2

[0063] Table 2 The composition of steel billets used in Example 2, wt%

[0064]

[0065]The thickness of the steel billet is 250mm, the heating temperature is 1211°C, and the soaking time is 55min; the starting rolling temperature in the rough rolling stage is 1147°C, 5 rolling passes, the final rolling temperature is 1126°C, the waiting temperature is 130mm, and after cooling to 852°C, enter The heat preservation device is kept warm for 4 minutes; the starting temperature of the finish rolling stage is 847°C, the finish rolling temperature is 839°C, and the thickness of the finished product is 90mm; it is air-cooled to 750°C and enters the online heat preservation and heating device. After 6 minutes of heat preservation, the gradient laminar flow cooling method is adopted. 4°C / s, cooled to 715°C, and then cooled for the second time after standing still for 30s. / s, cooled to 620°C, steel plate, and then air cooled to room temperature. Then enter the heat treatment furnace...

Embodiment 3

[0067] Table 3 The composition of steel billets used in Example 3, wt%

[0068]

[0069] The thickness of the steel billet is 300mm, the heating temperature is 1245°C, and the soaking time is 48min; the starting rolling temperature in the rough rolling stage is 1156°C, the rolling passes are 6, the final rolling temperature is 1135°C, the waiting temperature is 125mm, and after cooling to 895°C, enter The heat preservation device keeps heat for 3 minutes; the start rolling temperature in the finishing rolling stage is 879°C, the finish rolling temperature is 860°C, and the thickness of the finished product is 110mm; air cooling to 720°C enters the online heat preservation and heating device, and after 10 minutes of heat preservation, the gradient laminar flow cooling method is adopted. It is 3°C / s, cooled to 673°C, and then cooled for the second time after standing still for 30s. / s, cooled to 575°C, steel plate, then air cooled to room temperature. Then enter the heat tre...

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Abstract

The invention discloses a high-uniformity steel plate with a super-thick structure and a manufacturing method thereof. The steel plate is prepared from C, Si, Mn, P, S, Nb, Ti, Cu, Als and the balanceFe and impurities. The manufacturing method comprises the steps that a mode of optimizing a rolling cooling process and sequentially conducting rough rolling, fine rolling and heat preservation or heating is adopted, so that the temperature uniformity of the surface and the core part of a steel blank in the rolling process is guaranteed, and uniform refining of internal tissue grains of steel isachieved; in the cooling process, a segmented stepped cooling mode is adopted, the temperature tissue uniformity of the steel plate in the thickness direction is further guaranteed by means of the redreturning process of stepped cooling, and the internal tissue grains are further refined, so that the high-uniformity super-thick steel plate is obtained. According to the high-uniformity steel platewith the super-thick structure and the manufacturing method thereof, the intensity difference of the surface-close layer, the position about 1 / 4 thickness and the position about 1 / 2 thickness of thesteel plate is smaller than or equal to 15 MPa, and the steel plate is uniform in strength property, high in strength and toughness and excellent in lamellar tearing resistant property and welding property.

Description

technical field [0001] The invention relates to the technical field of steel manufacture, in particular to a high-uniformity super-thick structural steel plate and a manufacturing method thereof. Background technique [0002] With the rapid development of my country's economy, the infrastructure construction is changing with each passing day, the urbanization process is accelerating, the urban population is continuously concentrated, and the construction speed of bridges and buildings is accelerating. The use of structural steel in bridges, buildings and other fields is increasing year by year. As an important structural part, structural steel requires thick plates and super-thick plates as stress-bearing parts. This requires super-thick plates not only to have high strength, high toughness, and lamellar tear resistance, but also to ensure excellent strength in the thickness direction. The uniformity of the structure and performance ensures the safety of the steel structure. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/16C22C38/12C22C38/14C21D8/02
CPCC21D8/0226C21D8/0247C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C38/16
Inventor 余宏伟王孝东梁宝珠张欢鲍海燕易勋杨波苏亮余爱华陈英
Owner WUHAN IRON & STEEL GRP ECHENG IRON & STEEL CO LTD
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