500 MPa-grade high-strength anti-seismic structural steel and production method thereof

A technology of anti-seismic structure and production method, applied in the direction of metal rolling, etc., can solve the problems of high yield ratio, difficulty in guaranteeing strength, and inability to meet the anti-seismic requirements of high-rise steel

Pending Publication Date: 2021-07-02
SHOUGANG JINGTANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] TMCP process steel plate has the advantages of low cost, good low temperature toughness and weldability, etc., but the applicant found in the process of invention that: TMCP process steel plate has large fluctuations in strength and high yield strength ratio, which cannot meet the high shock resistance requirements of Gaojian Steel
The current common method is to use the normalizing process, although the yield ratio can be reduced, but a large amount of alloy needs to be added, the weldability is poor, and the strength is difficult to guarantee

Method used

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  • 500 MPa-grade high-strength anti-seismic structural steel and production method thereof
  • 500 MPa-grade high-strength anti-seismic structural steel and production method thereof
  • 500 MPa-grade high-strength anti-seismic structural steel and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] A 500MPa-grade high-strength anti-seismic structural steel, the chemical composition of the steel is: C: 0.11%, Si: 0.22%, Mn: 1.18%, Alt: 0.038%, Nb: 0.012%, Ti: 0.016% , Ni: 0.16%, Cr: 0.43%, Mo: 0.26%, P: 0.011%, S: 0.0009%, the rest is Fe and unavoidable impurities;

[0062] The preparation method provided above is used for preparation, and the important parameters in the preparation process are as follows: the size of the slab is 200*1850*2800 (mm), the size of the steel plate is 35*1980*13150 (mm), the compression ratio is 5.71, and the width ratio is 1.07. The center segregation of slab is C type 0.5. The heating temperature is 1151°C, the double-stand two-stage controlled rolling, the finishing rolling start temperature is 858°C, the final rolling temperature is 821°C, the waiting thickness is 70mm, the final cooling temperature is 590°C, and the cooling rate is 18°C / S.

Embodiment 2

[0064] A 500MPa grade high-strength anti-seismic structural steel, the chemical composition of the steel is: C: 0.12%, Si: 0.25%, Mn: 1.15%, Alt: 0.035%, Nb: 0.010%, Ti: 0.014%, Ni : 0.15%, Cr: 0.46%, Mo: 0.27%, P: 0.010%, S: 0.001%, the rest is Fe and unavoidable impurities,

[0065] The preparation method provided above is used for preparation, and the important parameters in the preparation process are as follows: the size of the slab is 250*1850*3550 (mm), the size of the steel plate is 50*2820*10090 (mm), the compression ratio is 5.0, and the width ratio is 1.53. The center segregation of slab is C type 0.5. The heating temperature is 1160°C, the double-stand two-stage controlled rolling, the finishing rolling start temperature is 840°C, the final rolling temperature is 801°C, the waiting thickness is 100mm, the final cooling temperature is 565°C, and the cooling rate is 13°C / S.

experiment example

[0067] Example 1-2 and 5 batches were randomly selected for performance testing, and the test results are shown in the table below.

[0068]

[0069]

[0070] It can be obtained from the examples and sampling data that the structural steel is prepared by adopting the formula and process provided by the implementation of the present invention, which realizes narrow strength fluctuation control, greatly reduces the yield ratio, and improves the Z-direction performance of the steel plate. High strength and good shock resistance at the same time, the yield strength of the prepared structural steel is ≥520-580 (MPa), the tensile strength is ≥660-720 (MPa), the yield ratio is ≤0.82, and the average impact energy at -20°C is ≥ 180J, Z direction average value ≥60%.

[0071] One or more technical solutions in the embodiments of the present invention also have at least the following technical effects or advantages:

[0072] (1) The structural steel ratio provided by the embodimen...

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Abstract

The invention particularly relates to 500 MPa-grade high-strength anti-seismic structural steel and a production method thereof, and belongs to the technical field of steel preparation. The steel comprises the following chemical components of, by mass, 0.10%-0.13% of C, 0.15%-0.35% of Si, 1.0%-1.2% of Mn, 0.02%-0.06% of Alt, 0.007%-0.15% of Nb, 0.010%-0.02% of Ti, 0.1%-0.2% of Ni, 0.4%-0.5% of Cr, 0.2%-0.3% of Mo, less than 0.012% of P, less than 0.002% of S and the balance Fe and inevitable impurities. The structural steel is guaranteed to be high in strength, narrow in strength fluctuation and low in yield ratio and has good weldability, low-temperature toughness and lamellar tearing resistance.

Description

technical field [0001] The invention belongs to the technical field of steel preparation, and in particular relates to a 500MPa high-strength anti-seismic structural steel and a production method thereof. Background technique [0002] Compared with traditional concrete buildings, steel structure buildings have higher construction efficiency, are more green and environmentally friendly, and have better earthquake resistance. With the rapid development of steel structure buildings, the demand for high-rise construction steel is developing in the direction of high strength, narrow strength fluctuation, low yield ratio, good weldability, low temperature toughness, and lamellar tear resistance. [0003] TMCP process steel plate has the advantages of low cost, good low temperature toughness and weldability, etc., but the applicant found in the process of invention that: TMCP process steel plate has large fluctuations in strength and high yield strength ratio, which cannot meet the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/44C22C38/48C22C38/50C22C33/04B21B3/00
CPCC22C38/02C22C38/04C22C38/06C22C38/48C22C38/50C22C38/44C22C38/002C22C33/04B21B3/00B21B2003/001
Inventor 韩承良王根矶于文飞王庆敏王东柱王志勇马国金武卫阳魏运飞冯博马龙腾王彦锋杨永达齐岩师大兴于海波孙博
Owner SHOUGANG JINGTANG IRON & STEEL CO LTD
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