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A kind of vanadium-titanium microalloyed hot-rolled low-carbon bainite strip steel and production method thereof

A low-carbon bainite and micro-alloying technology, which is applied in the field of vanadium-titanium micro-alloyed hot-rolled low-carbon bainite strip steel and its production field, can solve the problems of high alloy cost, tendency of transverse cracking of cast slabs, etc. The effect of reducing the cost of microalloying, stable performance, and overcoming the tendency of transverse cracks in the slab

Active Publication Date: 2016-02-17
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a vanadium-titanium micro-alloyed hot-rolled low-carbon bainite strip steel and a production method thereof in order to overcome the disadvantages of high cost of existing steel alloys and the tendency of slab transverse cracks. Micro-alloying (using expensive ferroniobium alloy), and the produced vanadium-titanium micro-alloying hot-rolled low-carbon bainite strip steel overcomes the shortcoming of the transverse crack tendency of the slab, and has high strength and plasticity

Method used

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  • A kind of vanadium-titanium microalloyed hot-rolled low-carbon bainite strip steel and production method thereof
  • A kind of vanadium-titanium microalloyed hot-rolled low-carbon bainite strip steel and production method thereof
  • A kind of vanadium-titanium microalloyed hot-rolled low-carbon bainite strip steel and production method thereof

Examples

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Embodiment 1

[0034] This example is used to illustrate the vanadium-titanium microalloyed hot-rolled low-carbon bainite strip steel and its production method of the present invention.

[0035]The steel is smelted on a 200-ton converter, and the molten steel whose composition is shown in Table 1 is obtained, and the molten steel is continuously cast into a slab of 200mm×1700mm×10020mm (thickness×width×length), and the slabs obtained by continuous casting are successively Reheating, rough rolling, finish rolling, cooling and coiling are carried out, and strip steel is finally produced. Among them, the slab is heated to 1200°C in a natural gas heating furnace, and then rolled on a 2050mm hot rolling mill. 5 passes to obtain an intermediate slab with a thickness of 50mm, and then carry out finish rolling on the intermediate slab. The start rolling temperature of the finish rolling is controlled at 880°C, the finish rolling temperature is controlled at 790°C, and the finish rolling is carried o...

Embodiment 2-9

[0045] According to the method of embodiment 1, the difference is that the molten steel composition is as shown in table 1, the slab heating temperature, the start rolling temperature of rough rolling, the finish rolling temperature of rough rolling, the start rolling temperature of finish rolling, the finish rolling temperature of finish rolling The temperature, cooling rate and coiling temperature are shown in Table 2, respectively, and the thickness of the slab obtained by continuous casting, the thickness of the intermediate slab obtained by rough rolling, and the thickness of the hot-rolled strip are shown in Table 3, respectively.

[0046] From the vanadium-titanium microalloyed hot-rolled low-carbon bainite steel strip obtained in Examples 1-9, metallographic samples were taken, and after grinding, polishing, and etching, the microstructure was observed and analyzed with an optical microscope, and transmission Electron microscope was used to observe the precipitates.

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Abstract

The invention discloses a vanadium-titanium-microalloyed hot-rolled low-carbon bainite steel strip and a production method thereof. The method comprises the following steps: continuously casting molten steel to obtain a plate blank, and sequentially carrying out reheating, rough rolling, finish rolling, cooling and coiling on the plate blank. The plate blank contains 0.09-0.12 wt% of C, 0.10-0.20 wt% of Si, 1.75-1.85 wt% of Mn, 0.06-0.10 wt% of V, 0.035-0.050 wt% of Ti, and the balance of Fe and inevitable impurities. The method can be used for producing the vanadium-titanium-microalloyed hot-rolled low-carbon bainite steel strip with higher strength plasticity without performing Nb microalloying.

Description

technical field [0001] The invention relates to the technical field of metal composition design and thermal processing, in particular to a vanadium-titanium micro-alloyed hot-rolled low-carbon bainite strip steel and a production method thereof. Background technique [0002] Ultra-low carbon bainite (ULCB) steel is a new steel series with high strength, high toughness, good formability and welding performance developed in the past 20 years. It is called a new generation of steel materials for the 21st century by countries all over the world. [0003] At present, ULCB steel is mainly achieved by adding elements to improve hardenability such as Mn, Mo, B, etc., and through microalloying elements Nb, Ti, Cu, etc., using relaxation-precipitation controlled phase transformation (RCP) to achieve fine Small bainite lath structure and precipitation strengthening. The thick steel plate adopts aging treatment to give full play to the dispersed precipitation of Cu. However, in terms ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/14C22C33/04C21D8/02C21D6/00
Inventor 杨雄飞张开华陈永蒋仁贵姚永国
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP