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Method for producing Q460-grade building steel with low yield ratio and high toughness under air cooling

A low yield ratio, construction steel technology, applied in the field of steel plates for building structures, can solve the problems of high cost and high steel yield, and achieve the effects of good low temperature toughness, low yield ratio and stable production

Active Publication Date: 2021-06-08
广西柳钢华创科技研发有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the invention is to solve the problem of relatively high yield strength and high cost of steel for building structures

Method used

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  • Method for producing Q460-grade building steel with low yield ratio and high toughness under air cooling
  • Method for producing Q460-grade building steel with low yield ratio and high toughness under air cooling
  • Method for producing Q460-grade building steel with low yield ratio and high toughness under air cooling

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] The metallographic structure of embodiment 1 is as Figure 1a and Figure 1b As shown, the metallographic structure of Example 1 is F+P+a small amount of B, the grain size of F at the edge is 9 to 14, the proportion of fine grains with a grain size of 14 on the surface is 78%, and the grain size of F at the center is 78%. Level 10;

Embodiment 2

[0068] The metallographic structure of embodiment 2 is as Figure 2a and Figure 2b As shown, the metallographic structure of Example 2 is F+P, the F grain size of the edge is 9 to 13, the fine grain ratio of the surface grain size is 13 is 76%, and the F grain size of the center is 11 ;

[0069] The precipitate image of embodiment 2, energy spectrum result and size histogram are as follows Figure 2c , Figure 2d , Figure 2e , Figure 2f and Figure 2g As shown, the average size of the precipitates is 11.02nm, most of the precipitates are concentrated in the range of 0-10nm, and the volume percentage of the precipitates is 0.178%;

[0070] The K-T curve of embodiment 2 is as Figure 2h Shown, the ductile-brittle transition temperature T 50％FAT = -28.5°C;

Embodiment 3

[0071] The metallographic structure of embodiment 3 is as Figure 3a and Figure 3b As shown, the metallographic structure of Example 3 is F+P+a small amount of B, the grain size of F at the edge is 9 to 14, the proportion of fine grains with a grain size of 14 on the surface is 82%, and the grain size of F at the center is 82%. Grade 11;

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Abstract

The invention provides a method for producing Q460-grade building steel with a low yield ratio and high toughness under air cooling. The method sequentially comprises the following steps of converter molten steel smelting, LF refining, RH, slab continuous casting, slab heating, descaling, rough rolling, finish rolling and steel plate inspection. The Q460-grade building steel with the low yield ratio and the high toughness comprises the following chemical components in percentage by weight of 0.14 to 0.17 Wt% of C, 0.25 to 0.45 Wt% of Si, 1.50 to 1.70 Wt% of Mn, less than or equal to 0.02 Wt% of P, less than or equal to 0.008 Wt% of S, 0.040 to 0.055 Wt% of V, 0.018 to 0.028 Wt% of Ti, 0.020-0.050Wt% of ALt, and the balance of Fe and inevitable trace elements. According to the method, Cr and Mo elements do not need to be added, cooling equipment does not need to be controlled or off-line heat treatment is not needed, through design and optimization of components and the process, fine grain strengthening serves as a main strengthening manner, precipitation strengthening is carried out twice, the precipitation proportion and the refining degree of a ferrite structure are controlled, therefore the material obtains the use performance such as the lower yield ratio and the better low-temperature toughness, and stable production of the product is realized.

Description

technical field [0001] The invention relates to a steel plate for building structure, in particular to a production method of Q460 grade steel for building with low yield ratio and high toughness under air cooling. Background technique [0002] In recent years, the height of high-rise buildings has been increasing, the cost of materials and engineering has been continuously reduced, and the requirements for safety and seismic performance have become higher and higher. In order to enable domestic construction steel to meet the needs of domestic high-rise building manufacturing and catch up with the advanced level of foreign construction steel production, the National Iron and Steel Revitalization Plan has included earthquake-resistant, earthquake-resistant, and fire-resistant high-performance construction steel as a key variety and given priority support. [0003] Steel plates for high-rise buildings are different from steel plates for general or other special structures. In ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/12C22C38/14C22C38/06C21D8/02
CPCC22C38/02C22C38/04C22C38/12C22C38/14C22C38/06C21D8/0226C21D2211/005C21D2211/009C21D2211/002
Inventor 樊雷肖娟杨跃标李显潘刚陈利周从锐袁勤攀朱鹏宇张广川赵贤平廖桓萱何涛甘雯雯
Owner 广西柳钢华创科技研发有限公司
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