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Rare earth treated normalized Q460GJ steel plate for buildings and production method of steel plate

A production method and construction technology, applied in the field of normalized Q460GJ construction steel plate and its production method, can solve the problems of different chemical composition and production process, and achieve excellent laminar tear resistance and low yield strength ratio. , the effect of improving the overall performance

Inactive Publication Date: 2016-06-08
INNER MONGOLIA BAOTOU STEEL UNION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Adding rare earth elements in the steelmaking process can significantly improve the comprehensive performance of construction steel. In recent years, metallurgists at home and abroad have done a lot of research work, but because the chemical composition and production process of each steel are different, there is no The current method, for Q460GJ construction steel plate, there is no application case of adding rare earth elements

Method used

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  • Rare earth treated normalized Q460GJ steel plate for buildings and production method of steel plate
  • Rare earth treated normalized Q460GJ steel plate for buildings and production method of steel plate
  • Rare earth treated normalized Q460GJ steel plate for buildings and production method of steel plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The raw material molten iron is subjected to deep desulfurization of molten iron, top-bottom blowing of converter, argon blowing of ladle, external refining of LF furnace, RH vacuum treatment and continuous casting process to obtain 300mm thick slab with chemical composition weight percentage shown in Table 1. The slab heating temperature is 1220°C, the heating time is 243min, the rolling start temperature of the first stage is 1190°C, and the relative reduction ratio of a single pass is controlled at least 20% in at least two passes. When the thickness of the rolled piece is 120mm, After the temperature reaches 910°C, the second-stage rolling is carried out, the final rolling temperature is 840°C, and the thickness of the finished steel plate is 60mm. After rolling, the steel plate enters the accelerated cooling (ACC) equipment and is cooled to 680°C at a rate of 5°C / s. After hot straightening, the cooling bed is cooled. After finishing and shot blasting, it is sent to...

Embodiment 2

[0028] The implementation is the same as in Example 1, wherein the heating temperature is 1215°C, the heating time is 230min, the rolling start temperature of the first stage rolling is 1185°C, the starting rolling temperature of the second stage rolling is 900°C, and the thickness of the rolled piece is 126mm. The final rolling temperature is 850°C, and the thickness of the finished steel plate is 70mm. The cooling rate of the steel plate is 6°C / s, and the final cooling temperature is 670°C. After hot straightening, the cooling bed is cooled. After finishing and shot blasting, it is sent to the normalizing furnace for normalizing treatment. The normalizing temperature is 880°C, and the time T in the furnace is 1.5t+10. The unit of T is min, and t is the thickness of the steel plate in mm. Finally, the finished steel plate can be obtained.

Embodiment 3

[0030] The implementation is the same as in Example 1, wherein the heating temperature is 1210°C, the heating time is 230min, the rolling start temperature of the first stage rolling is 1190°C, the starting rolling temperature of the second stage rolling is 890°C, and the thickness of the rolled piece is 128mm. The final rolling temperature is 860°C, and the thickness of the finished steel plate is 80mm. The cooling rate of the steel plate is 8°C / s, and the final cooling temperature is 660°C. After hot straightening, the cooling bed is cooled. After finishing and shot blasting, it is sent to the normalizing furnace for normalizing treatment. The normalizing temperature is 880°C, and the time T in the furnace is 1.5t+10. The unit of T is min, and t is the thickness of the steel plate in mm. Finally, the finished steel plate can be obtained. The metallographic structure diagram of embodiment 3 steel plate 1 / 2 thickness place is as figure 2 As shown, the metallographic struct...

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Abstract

The invention discloses a rare earth treated normalized Q460GJ steel plate for buildings and a production method of the steel plate, and belongs to the technical field of steel for buildings. The steel plate comprises chemical components in percentage by weight as follows: 0.17-0.19% of C, 0.35-0.45% of Si, 1.50-1.60% of Mn, <=0.015% of P, <=0.010% of S, 0.03-0.04% of Nb, 0.05-0.06% of V, 0.01-0.02% of Ti, 0.2-0.3% of Ni, 0.020-0.040% of Als, 0.0010-0.0020% of rare earth La and the balance of Fe and impurities. The production method comprises the following steps: step I, smelting; step II, continuous casting; step III, heating; step IV, rolling and cooling; and step V, normalizing heat treatment. Therefore, the steel plate for buildings can be obtained, and the steel plate is in a metallographic structure of ferrites and pearlites with fine and uniform crystalline grains.

Description

technical field [0001] The invention specifically relates to a rare earth-treated normalizing Q460GJ construction steel plate and a production method thereof, belonging to the technical field of construction steel. Background technique [0002] Steel plates for construction are mainly used in high-rise buildings, super high-rise buildings, large-span stadiums, airports, railway stations, exhibition centers, steel structure workshops, and power transmission and transformation towers, etc. Large-scale construction projects with complex stress and high reliability requirements, For example, the CCTV main building, the National Swimming Center, and the National Stadium have used Q420 and Q460-grade steel plates for some of their components. It is expected that high-performance Q42O, Q460 and higher-grade steel grades will be widely used at home and abroad in the future. Construction steel requires steel plates to have low yield ratio, good toughness and plasticity, narrow yield ...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/02C22C38/12C22C38/14C22C38/08C22C38/06C22C33/04C21D8/02
CPCC22C38/04C21D6/005C21D8/0226C21D8/0263C22C33/04C22C38/005C22C38/02C22C38/06C22C38/08C22C38/12C22C38/14
Inventor 高军杨雄张昭陆斌刘洋吴鹏飞王皓刘丹
Owner INNER MONGOLIA BAOTOU STEEL UNION
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