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A kind of low-carbon v-n-nb microalloyed hot-rolled strip steel and its preparation method

A hot-rolled strip and micro-alloying technology, applied in the field of hot-rolled strip manufacturing, can solve the problems of excessive expensive alloying elements, unstable production process, etc., achieve a simple preparation process, and promote the formation of intragranular acicular ferrite. The effect of nuclear, low production cost

Active Publication Date: 2019-12-03
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention provides a low-carbon V-N-Nb microalloyed hot-rolled steel strip and its preparation method, which solves the problem of using expensive Excessive alloying elements and unstable production process

Method used

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  • A kind of low-carbon v-n-nb microalloyed hot-rolled strip steel and its preparation method
  • A kind of low-carbon v-n-nb microalloyed hot-rolled strip steel and its preparation method
  • A kind of low-carbon v-n-nb microalloyed hot-rolled strip steel and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A low-carbon V-N-Nb microalloyed hot-rolled steel strip with a thickness of 18.0mm, the chemical composition of which is: C: 0.06%, Mn: 2.2%, Si: 0.50%, S: 0.003%, P: 0.015%, Al: 0.0l%, V: 0.15%, N: 0.020%, Nb: 0.06%, Ti: 0.02%, Cr: 0.50%, the balance is Fe and other unavoidable impurities;

[0041] A kind of preparation method that is 18.0mm low-carbon V-N-Nb micro-alloyed hot-rolled strip steel, specifically comprises the following steps:

[0042] Step 1, casting:

[0043] According to the composition ratio of hot-rolled strip steel, it is smelted at 1550°C, and the obtained molten steel is cast and forged to obtain a billet with a thickness of 130mm;

[0044] Step 2, heating:

[0045] Heat the billet to 1200°C and keep it warm for 4h;

[0046] Step 3, rolling:

[0047] (1) The heated billet is subjected to 2 passes of rough rolling, the starting rolling temperature is 1180°C, the final rolling temperature is 1110°C, the average reduction rate of a single pass is ...

Embodiment 2

[0054] A low-carbon V-N-Nb micro-alloyed hot-rolled steel strip with a thickness of 10.0 mm, its chemical composition by weight percentage is: C: 0.11%, Mn: 1.9%, Si: 0.29%, S: 0.002%, P: 0.009%, Al: 0.05%, V: 0.10%, N: 0.012%, Nb: 0.04%, Ti: 0.015%, Cr: 0.36%, the balance is Fe and other unavoidable impurities;

[0055] A method for preparing a low-carbon V-N-Nb microalloyed hot-rolled steel strip with a thickness of 10.0mm, specifically comprising the following steps:

[0056] Step 1, casting:

[0057] According to the composition ratio of hot-rolled strip steel, it is smelted at 1550°C, and the obtained molten steel is cast and forged to obtain a billet with a thickness of 80mm;

[0058] Step 2, heating:

[0059] Heat the billet to 1150°C and keep it warm for 3h;

[0060] Step 3, rolling:

[0061] (1) The heated billet is subjected to 3 passes of rough rolling, the starting rolling temperature is 1130°C, the final rolling temperature is 1060°C, the average reduction rat...

Embodiment 3

[0068] A low-carbon V-N-Nb microalloyed hot-rolled steel strip with a thickness of 2.5 mm, the chemical composition of which is: C: 0.15%, Mn: 1.5%, Si: 0.10%, S: 0.003%, P: 0.012 %, Al: 0.01%, V: 0.06%, N: 0.008%, Nb: 0.03%, Ti: 0.01%, Cr: 0.20%, the balance is Fe and other unavoidable impurities;

[0069] A kind of thickness is the preparation method of 2.5mm low-carbon V-N-Nb micro-alloyed hot-rolled steel strip, specifically comprising the following steps:

[0070] Step 1, casting:

[0071] According to the composition ratio of hot-rolled strip steel, it is smelted at 1550°C, and the obtained molten steel is cast and forged to obtain a billet with a thickness of 50mm;

[0072] Step 2, heating:

[0073] Heat the billet to 1100°C and keep it warm for 2h;

[0074] Step 3, rolling:

[0075] (1) The heated slab is subjected to 4 passes of rough rolling, the starting rolling temperature is 1080°C, the final rolling temperature is 1005°C, the average reduction rate of a singl...

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Abstract

A low-carbon V‑N‑Nb microalloyed hot-rolled strip steel and its preparation method, belonging to the field of hot-rolled strip steel manufacturing, its chemical composition in weight percentage: C: 0.06~0.15%, Mn: 1.5~2.2%, Si: 0.10~0.50%, S: <0.005%, P: <0.015%, Al: 0.01~0.05%, V: 0.06~0.15%, N: 0.008~0.020%, Nb: 0.03~0.06%, Ti: 0.01 ~0.02%, Cr: 0.20~0.50%, the balance is Fe and other inevitable impurities. Method: 1) Melt according to the composition ratio and then cast and forge to obtain a steel billet; 2) Heating and maintaining; 3) The steel billet is subjected to multiple passes of rough rolling and finish rolling to obtain a hot-rolled plate; 4) The hot-rolled plate is first water-cooled and then cooled in the furnace to room temperature; this invention adopts low-carbon component design, with V-N-Nb micro-alloying as the core, and deformation in the austenite induces VN precipitates during the finishing rolling process. The preparation cost is low and the structural properties are stable, making it easy to realize industrial production. .

Description

technical field [0001] The invention belongs to the field of hot-rolled steel strip manufacturing, and in particular relates to a low-carbon V-N-Nb microalloyed hot-rolled steel strip and a preparation method thereof. Background technique [0002] With the continuous development of construction machinery and heavy-duty automobile industries towards high standards, large-scale and lightweight, the comprehensive requirements for steel plates are constantly increasing. , excellent formability, and good weldability. Because of its simple production process and wide application range, hot-rolled strip steel has a great demand in the structural steel market. Among them, the demand for 690MPa low-alloy high-strength steel is increasing day by day, mainly used as hydraulic supports and mining heavy trucks. Welded structural parts such as frames, heavy-duty vehicle compartments, girders, and wheels require high strength, good elongation, and excellent low-temperature impact toughnes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/24C22C38/26C22C38/28C22C33/04B21C37/04C21D8/02
CPCB21C37/04C21D8/0205C21D8/0226C21D8/0263C22C33/04C22C38/001C22C38/02C22C38/04C22C38/06C22C38/24C22C38/26C22C38/28
Inventor 杜林秀张彬胡军高秀华刘悦刘玉杰董营
Owner NORTHEASTERN UNIV LIAONING
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