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Bridge structural steel q345qe steel strip with low temperature toughness and production method thereof

A bridge structure, low temperature toughness technology, applied in the metallurgical field, can solve the problems of poor low temperature toughness, cracking, warping deformation, etc., and achieve the effects of stable performance, improved uniformity, and small anisotropy

Active Publication Date: 2020-07-03
HANDAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Bridge structural steel Q345qE steel plates often have cracks, poor low-temperature toughness, and warping after flame cutting or plasma cutting, which has brought huge losses to bridge structure processing enterprises; after analysis, the chemical composition of hot-rolled steel strips, Anisotropy of microstructure and mechanical properties is the main cause of "cracking, poor low temperature toughness"

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] In this embodiment, the steel strip of low temperature ductile bridge structure steel Q345qE has a thickness of 18mm, and its chemical composition and mass percentage are C: 0.13%, Si: 0.15%, Mn: 1.20%, P: 0.015%, S: 0.004% , Als: 0.020%, Nb: 0.018%, Ti: 0.015%, and the balance is Fe and unavoidable impurities.

[0022] The present embodiment has low-temperature ductile bridge structure steel Q345qE steel strip production method including smelting, continuous casting, heating, rolling, cooling, coiling process, and concrete process steps are as follows:

[0023] (1) Continuous casting process: The electric dynamic soft reduction technology is adopted, and the light reduction amount is increased in the first 4 segments at the end of the liquid core during the continuous casting process. Each segment is increased from the original 0.3mm to 1.5mm, and the total reduction 6mm, so as to reduce the centerline segregation of the slab; the chemical composition and mass percenta...

Embodiment 2

[0033] In this embodiment, the steel strip of low temperature ductile bridge structure steel Q345qE has a thickness of 20 mm, and its chemical composition and mass percentage are C: 0.13%, Si: 0.12%, Mn: 1.21%, P: 0.014%, S: 0.003% , Als: 0.028%, Nb: 0.015%, Ti: 0.018%, and the balance is Fe and unavoidable impurities.

[0034] The present embodiment has low-temperature ductile bridge structure steel Q345qE steel strip production method including smelting, continuous casting, heating, rolling, cooling, coiling process, and concrete process steps are as follows:

[0035] (1) Continuous casting process: Adopting dynamic soft reduction technology, the first 4 segments at the end of the liquid core during continuous casting increase the amount of light reduction, and each segment increases from the original 0.3mm to 1.5mm, and the total reduction 6mm, so as to reduce the centerline segregation of the slab, the chemical composition and mass percentage of the slab are C: 0.13%, Si: ...

Embodiment 3

[0045] In this embodiment, the steel strip of low temperature ductile bridge structure steel Q345qE has a thickness of 16 mm, and its chemical composition and mass percentage are C: 0.13%, Si: 0.12%, Mn: 1.21%, P: 0.013%, S: 0.003% , Als: 0.025%, Nb: 0.015%, Ti: 0.016%, and the balance is Fe and unavoidable impurities.

[0046] The present embodiment has low-temperature ductile bridge structure steel Q345qE steel strip production method including smelting, continuous casting, heating, rolling, cooling, coiling process, and concrete process steps are as follows:

[0047] (1) Continuous casting process: Adopting dynamic soft reduction technology, the first 4 segments at the end of the liquid core during continuous casting increase the amount of light reduction, and each segment increases from the original 0.3mm to 1.5mm, and the total reduction 6mm, so as to reduce the centerline segregation of the slab, the chemical composition and mass percentage of the slab are C: 0.13%, Si: ...

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Abstract

The invention discloses a bridge structural steel Q345qE steel strip with low-temperature toughness and a production method thereof. The steel strip comprises, by mass percent, 0.08 to 0.14% of C, notlarger than 0.20% of Si, 1.10 to 1.45% of Mn, not larger than 0.018% of P, not larger than 0.006% of S, 0.010 to 0.045% of Als, 0.012 to 0.035% of Nb, 0.008 to 0.025% of Ti, and the balance Fe and inevitable impurities. The production method comprises smelting, continuous casting, heating, rolling, cooling and reeling. The bridge structural steel Q345qE steel strip with low-temperature toughnessis stable in reeling property, uniform in grain particle, small in anisotropism and capable of greatly improving stability during Q345qE steel strip machining.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a Q345qE steel strip of bridge structural steel with low-temperature toughness and a production method thereof. Background technique [0002] Structural steel for bridges is the main load-bearing component used in the construction of road bridges and railway bridges. It bears almost the entire weight of the bridge. The quality of structural steel for bridges affects the service life and safety of the entire bridge. Construction of road bridges and railway bridges generally Welding forming process and cold bending are mainly used, so the structural steel plates for bridges have high requirements on welding performance and low temperature toughness, that is, structural steel plates for bridges must have good comprehensive properties, sufficient strength and toughness, and good fatigue resistance. . With the development of highway and railway bridge industry, it is o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C21D8/02B22D11/12B22D11/16
CPCB22D11/1206B22D11/16C21D8/0226C22C38/002C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14
Inventor 贾改风王文录李红俊李斌王朔阳李冠楠潘竟忠
Owner HANDAN IRON & STEEL GROUP