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A kind of q345 grade anti-seismic steel and the method for producing q345 grade anti-seismic steel with a steel coil mill

A technology of steckel rolling mill and anti-seismic steel, which is applied in the field of metal material processing and forming, can solve the problems of low yield ratio and high strength, achieve low yield ratio, improve strength and toughness, and achieve significant economic benefits

Inactive Publication Date: 2017-06-13
KUNMING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The currently developed Q345 anti-seismic steel plate in my country mainly adopts the production process of medium and heavy plate, and all adopt hot rolling technology. There is no report on the production of anti-seismic steel plate by using a single double-stand compact stove coil rolling mill. For this reason, Wuhan Iron and Steel Group Corporation ( Kunming Iron and Steel Co., Ltd.) double-stand compact steckel rolling mill, which continuously completes rough rolling, intermediate rolling and finishing rolling, thus develops high-strength, low-yield-ratio Q345 seismic steel plate, which has no precedent.

Method used

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  • A kind of q345 grade anti-seismic steel and the method for producing q345 grade anti-seismic steel with a steel coil mill
  • A kind of q345 grade anti-seismic steel and the method for producing q345 grade anti-seismic steel with a steel coil mill
  • A kind of q345 grade anti-seismic steel and the method for producing q345 grade anti-seismic steel with a steel coil mill

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The Q345 anti-seismic steel, the percentage composition of the Q345 anti-seismic steel is: C0.16wt%, Si0.46wt%, Mn1.35wt%, S0.030wt%, P0.032wt%, Nb0.035wt%, V0.02wt% %, Ti0.02wt%, N0.007wt%, Als0.015wt%, and the rest are Fe and other impurities, which are unavoidable impurities.

[0025] The method for producing Q345 grade shock-resistant steel with this steckel mill: firstly, after heating the slab and spraying water to remove phosphorus, the rough rolling and finish rolling are continuously completed on the same double-stand compact steck The steel plate is sent to the coiler to be coiled, and then naturally air-cooled to room temperature, and the Q345 seismic steel plate with high strength and low yield ratio is obtained.

[0026] Specific steps are as follows:

[0027] Step 1. First, heat the slab at 1230°C for 170 minutes, and control the time of the slab in the soaking section to 50 minutes to ensure that the micro-alloys such as Nb and V precipitated in the slab...

Embodiment 2

[0037] The Q345 anti-seismic steel, the percentage components of the Q345 anti-seismic steel are: C0.08wt%, Si0.50wt%, Mn1.70wt%, S0.025wt%, P0.028wt%, Nb0.030wt%, V0.03wt% %, Ti0.03wt%, N0.009wt%, Als0.028wt%, the rest is Fe and unavoidable impurities.

[0038] The method for producing Q345 grade shock-resistant steel with this steckel mill: firstly, after heating the slab and spraying water to remove phosphorus, the rough rolling and finish rolling are continuously completed on the same double-stand compact steck The steel plate is sent to the coiler to be coiled, and then naturally air-cooled to room temperature, and the Q345 seismic steel plate with high strength and low yield ratio is obtained.

[0039] Specific steps are as follows:

[0040] Step 1. First, heat the slab for 190 minutes at a temperature of 1240° C., and control the time of the slab in the soaking section to 60 minutes to ensure that the micro-alloys such as Nb and V precipitated in the slab are fully re-...

Embodiment 3

[0050] The Q345 anti-seismic steel, the percentage composition of the Q345 anti-seismic steel is: C0.13wt%, Si0.35wt%, Mn1.55wt%, S0.032wt%, P0.025wt%, Nb0.030wt%, V0.04wt% %, Ti0.05wt%, N0.010wt%, Als0.015wt%, the rest is Fe and unavoidable impurities.

[0051] The method for producing Q345 grade shock-resistant steel with this steckel mill: firstly, after heating the slab and spraying water to remove phosphorus, the rough rolling and finish rolling are continuously completed on the same double-stand compact steck The steel plate is sent to the coiler to be coiled, and then naturally air-cooled to room temperature, and the Q345 seismic steel plate with high strength and low yield ratio is obtained.

[0052] Specific steps are as follows:

[0053] Step 1. First, heat the slab at a temperature of 1210°C for 150 minutes, and the time of the slab in the soaking section is controlled at 50 minutes to ensure that the micro-alloys such as Nb and V precipitated in the slab are fully...

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Abstract

The invention relates to Q345-grade anti-seismic steel and a method for producing the Q345-grade anti-seismic steel by virtue of a steckel mill, belonging to the technical fields of machining and forming of metal materials. The Q345-grade anti-seismic steel comprises the following components: C, Si, Mn, S, P, Nb, V, Ti, N, Als and the balance of Fe and impurities. The method comprises the steps of firstly heating a plate blank, spraying water to remove phosphorous, continuously finishing rough milling and precision milling on a double-stander compact steckel mill, feeding the finely milled steel plate to a reeling machine to be reeled, and naturally air cooling to the room temperature, so as to obtain the Q345-grade anti-seismic steel with high strength and low yield ratio. By adding microalloying elements such as Nb and V into the Q345-grade anti-seismic steel, the strength and the toughness of the Q345-grade anti-seismic steel are effectively improved. According to the Q345-grade anti-seismic steel produced by virtue of the method, the potential of the double-stander compact steckel mill manufactured by Kunming iron and steel Co., Ltd. is adequately explored, the variety of plate strip products is expanded, and the product structure is optimized.

Description

technical field [0001] The invention relates to a Q345 anti-seismic steel and a method for producing the Q345 anti-seismic steel with a steel coil mill, belonging to the technical field of metal material processing and forming. Background technique [0002] As a construction steel, the anti-seismic steel plate has the characteristics of high tensile strength, low yield ratio, excellent Z-direction performance, and good welding performance. With the development of high-rise buildings and the occurrence of geological disasters in recent years, the world and my country have paid attention to the development of seismic structural steel. The main anti-seismic steels used in the United States are ASTM A992 structural steel and ASTM A572 structural steel (additional yield ratio requirements). In recent years, Japan has developed a series of low yield ratio seismic structural steels, such as HT490 steel, HT590 steel and HT780 steel, etc., all of which have a narrow yield strength f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/14C21D8/02
CPCC21D8/02C22C38/02C22C38/04C22C38/06C22C38/14
Inventor 阴树标赵宇曹建春张卫强张志波李金柱杨春雷张红斌陈伟朱道飞黄帮福王建军张小明李庆超周晓龙
Owner KUNMING UNIV OF SCI & TECH
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