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A kind of hot-rolled steel strip for Q235 anti-seismic structure and its preparation method

A technology for seismic structures and steel strips, which is applied in the field of hot-rolled steel strips for Q235 seismic structures and their preparation, can solve the problems of high alloy cost, poor equipment and process adaptability, low yield-to-strength ratio, etc. Effect of narrow strength fluctuation range, low yield ratio

Active Publication Date: 2018-01-26
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention has prepared Q345 grade anti-seismic steel plate with high strength, high toughness, low yield ratio, and excellent Z-direction performance. However, due to the addition of alloy elements such as Nb, V, and Ti, the alloy cost is relatively high. In addition, the invention Applicable to steckel mills, with poor equipment and process adaptability

Method used

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  • A kind of hot-rolled steel strip for Q235 anti-seismic structure and its preparation method
  • A kind of hot-rolled steel strip for Q235 anti-seismic structure and its preparation method
  • A kind of hot-rolled steel strip for Q235 anti-seismic structure and its preparation method

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preparation example Construction

[0032] The production process of the above-mentioned hot-rolled steel strip for Q235-grade anti-seismic structure is as follows: desulfurization of molten iron → converter smelting combined blowing → deoxidation and alloying → small platform behind the furnace to feed Al wire → LF refining heating → continuous casting →Slab heating→High pressure water descaling→Rough rolling→Hot coil box coiling→Finish rolling→Laminar cooling→Coiling→Packing and storage, including the following steps:

[0033] a. Slab heating: heat the slab at 1160-1200°C for 160-320 minutes; not only ensure that the slab is fully heated, chemical elements are fully dissolved, but also prevent abnormal growth of austenite grains;

[0034] b. Rough rolling: the slab heated in step a is rolled for 5 or 7 passes, and the deformation of each pass is ≥ 20%. The rolling line is full-length and fully descaled during rolling; the thickness of the finished product is different, The thickness of the intermediate billet ...

Embodiment 1

[0045] 11.75mm thick Q235KZ anti-seismic structural steel adopts the C-Mn steel composition route, and the steel billet is obtained through molten iron pretreatment, converter smelting, LF heating furnace refining, and continuous casting. The specific chemical composition weight percentage is: C 0.15%; Si 0.12% ; Mn0.15%; P 0.02%; S 0.01%; billet reheating temperature is 1185 ℃, reheating time is 288min; %, 30%, 30%, the thickness of the intermediate billet is 31mm; the finishing rolling is 6-stand hot continuous rolling, and the reduction rates of each pass are 33%, 30%, 0, 21%, 0, 10%, and the final rolling The temperature is 867°C. After the finish rolling, it is cooled to 600°C at a cooling rate of 19°C / s by means of sparse cooling.

[0046] After testing, the mechanical properties of the Q235KZ anti-seismic steel produced in this example are: Rel: 273MPa, Rm: 421MPa, A: 32.5%, Rel / Rm: 0.65, Charpy impact energy at 0°C: 133J, yield platform length: 2.6% , the metallograph...

Embodiment 2

[0048] 7.5mm thick Q235KZ anti-seismic structural steel adopts the C-Mn steel composition route, and the billet is obtained through molten iron pretreatment, converter smelting, LF heating furnace refining, and continuous casting. The specific chemical composition weight percentage is: C 0.15%; Si 0.13% ; Mn0.19%; P 0.014%; S 0.012%; billet reheating temperature is 1190 ℃, reheating time is 308min; %, 30%, 30%, the thickness of the intermediate billet is 33mm; the finishing rolling is 6-stand hot continuous rolling, and the reduction rates of each pass are 34%, 30%, 0, 22%, 0, 10%, and the final rolling The temperature is 865°C. After the finish rolling, it is cooled to 605°C at a cooling rate of 17°C / s by means of sparse cooling.

[0049] After testing, the mechanical properties of the Q235KZ anti-seismic steel produced in this example are: Rel: 313MPa, Rm: 461MPa, A: 35.0%, Rel / Rm: 0.68, Charpy impact energy at 0°C: 142J, yield platform length: 2.4% , the metallographic str...

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Abstract

The invention relates to hot rolled steel and a preparation method thereof, in particular to a hot-rolled steel belt used for a Q235-level anti-seismic structure and a preparation method of the hot-rolled steel belt. The hot-rolled steel belt used for the Q235-level anti-seismic structure is composed of, by mass percentage, 0.13%-0.18% of C, 0.01%-0.20% of Si, 0.10%-0.30% of Mn, smaller than or equal to 0.025% of P, smaller than or equal to 0.015% of S and the balance Fe and inevitable impurities. The hot-rolled steel belt produced through the method and used for the Q235-level anti-seismic structure is low in alloy cost and simple in process and has the beneficial effects of being low in yield-strength ratio, high in ductility, high in impact toughness, narrow in strength fluctuating range, good in welding performance, capable of obtaining an obvious yielding platform and the like.

Description

technical field [0001] The invention relates to a hot-rolled steel strip and a preparation method thereof, in particular to a hot-rolled steel strip for a Q235 earthquake-resistant structure and a preparation method thereof. Background technique [0002] The steel used in traditional building structures emphasizes firmness, and high-strength steel is mainly used; the steel used in modern building structures has higher and higher requirements for earthquake resistance, not only requiring sufficient tensile strength and yield strength, but also requiring high ductility, high toughness, low Comprehensive properties such as yield ratio, good welding performance, good lamellar tear resistance and narrow strength fluctuation range. The lower yield strength ratio enables the steel to absorb more earthquake energy from the initial plastic deformation to the final fracture, the obvious yield platform effectively prolongs the fracture resistance time of the steel, and good toughness c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C33/04C21D8/02
CPCC21D8/0226C21D2211/005C22C33/04C22C38/02C22C38/04
Inventor 熊雪刚张开华叶晓瑜刘勇黄徐晶郭韬刘富贵邱敏刘序江崔凯禹肖尧
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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