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VN microalloyed steel for coal mine hydraulic support and preparation method of VN microalloyed steel

A coal mine hydraulic and micro-alloying technology, applied in the direction of manufacturing tools, heat treatment equipment, furnaces, etc., can solve the problems of high equipment requirements, high cost, and high alloy addition, and achieve the effect of promoting the uniformity of structure and properties and strong feasibility.

Pending Publication Date: 2022-06-24
ANYANG IRON & STEEL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above-mentioned patented alloys are high in addition and high in cost. The existing patents basically use the TMCP process to obtain the steel for coal mine hydraulic supports. Compared with it, the equipment requirements are higher, and the steel for coal mine hydraulic supports produced by the existing TMCP technology mostly uses Ti-Nb- Microalloying routes such as Mo-Cr, while there are few steels for construction machinery produced by VN microalloying routes

Method used

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  • VN microalloyed steel for coal mine hydraulic support and preparation method of VN microalloyed steel
  • VN microalloyed steel for coal mine hydraulic support and preparation method of VN microalloyed steel
  • VN microalloyed steel for coal mine hydraulic support and preparation method of VN microalloyed steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A VN microalloyed coal mine hydraulic support steel and a preparation method thereof are prepared from the following raw materials according to the mass percentage: C: 0.16%, Si: 0.24%, Mn: 1.45%, P: 0.015%, S: 0.004 %, Al: 0.05%, N: 0.0079%, Nb: 0.018%, V: 0.042%, and the rest are Fe and unavoidable elements.

[0042] A kind of VN microalloying steel for production of coal mine hydraulic support and preparation method thereof, the chemical composition of the steel plate and its mass percentage are shown in Table 1, and the process steps of the production method of the steel plate for coal mine hydraulic support include:

[0043] Converter smelting: The raw materials are introduced into the smelting furnace for smelting, and the first billet is prepared, and the tapping C≥0.06% and P≤0.015% are controlled to avoid slag during the tapping process;

[0044] LF refining: white slag is carried out on the blanks in the first blank, and the white slag is kept for more than 15...

Embodiment 2

[0056] A VN micro-alloyed coal mine hydraulic support steel and a preparation method thereof are prepared from the following raw materials according to the mass percentage: C: 0.15%, Si: 0.24%, Mn: 1.43%, P: 0.017%, S: 0.005 %, Al: 0.006%, N: 0.0085%, Nb: 0.019%, V: 0.044%, and the rest are Fe and unavoidable elements.

[0057] A kind of VN microalloying steel for coal mine hydraulic support and preparation method thereof, the chemical composition of the steel plate and its mass percentage are shown in Table 3, and the process steps of the steel plate for coal mine hydraulic support production method include:

[0058] Converter smelting: the raw materials are introduced into the smelting furnace for smelting, and the first billet is prepared, and the tapping C≥0.06% and P≤0.015% are controlled to avoid slag during the tapping process;

[0059] LF refining: white slag is carried out on the blanks in the first blank, and the white slag is kept for more than 15 minutes, and the c...

Embodiment 3

[0071] A VN microalloyed coal mine hydraulic support steel and a preparation method thereof are prepared from the following raw materials according to the mass percentage: C: 0.17%, Si: 0.24%, Mn: 1.44%, P: 0.018%, S: 0.006 %, Al: 0.006%, N: 0.0090%, Nb: 0.020%, V: 0.044%, the rest are Fe elements and unavoidable elements,

[0072] A kind of VN microalloying steel for coal mine hydraulic support and preparation method thereof, the chemical composition of the steel plate and its mass percentage are shown in Table 5, and the process steps of the steel plate for coal mine hydraulic support production method include:

[0073] Converter smelting: the raw materials are introduced into the smelting furnace for smelting, and the first billet is prepared, and the tapping C≥0.06% and P≤0.015% are controlled to avoid slag during the tapping process;

[0074] LF refining: white slag is carried out on the blanks in the first blank, and the white slag is kept for more than 15 minutes, and t...

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Abstract

The invention discloses VN microalloying steel for a coal mine hydraulic support and a preparation method thereof.The VN microalloying steel is prepared from, by mass, 0.15%-0.18% of C, 0.20%-0.40% of Si, 1.3%-1.5% of Mn, smaller than or equal to 0.020% of P, smaller than or equal to 0.010% of S, smaller than or equal to 0.050% of Al, smaller than or equal to 0.0120% of N, 0.015%-0.020% of Nb, 0.040%-0.060% of V and the balance Fe and unavoidable elements. Compared with a traditional process, under the condition that the original austenite grain size of an extra-thick plate is large, VN precipitates are formed in deformation-induced austenite in the rolling process, and a controlled cooling process is combined, so that the production process of the steel for the 550MPa-grade coal mine hydraulic support is achieved. And the needle-shaped ferrite structure with good obdurability is obtained, the structure property uniformity of the plate is greatly promoted, and the process route has extremely high feasibility.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, in particular to a VN microalloyed coal mine hydraulic support steel and a preparation method thereof. Background technique [0002] With the development of large-scale, high-parameter and high-efficiency coal mine hydraulic supports, more and more high-strength structural steel is required, which greatly promotes the development of coal mine hydraulic support steel. [0003] CN201210119483.8 discloses a method for producing high toughness engineering machinery steel by using TMCP. Its components are calculated by weight percentage: C: 0.04-0.07%, Mn: 1.60-1.90%, Si: 0.25-0.45%, Al: 0.015-0.050%, P≤0.015%, S≤0.008%, Nb+Ti: 0.06-0.09%, Mo+Cr: 0.20-0.40%. Steel for construction machinery with yield strength ≥550MPa, tensile strength ≥700MPa and impact energy ≥200J is obtained by segmented rolling and laminar cooling. [0004] CN201410593263.8 discloses a steel plate for construct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/02C21D9/00C22C33/04C22C38/00C22C38/02C22C38/04C22C38/06C22C38/12
CPCC22C38/02C22C38/04C22C38/06C22C38/001C22C38/12C22C33/04C21D8/0226C21D9/0081C21D2211/002C21D2211/005C21D2211/009
Inventor 陈尹泽欧阳瑜武宝庆黄重孙斌韦弦宋立伟李娜徐博赵良生张青龙李淼徐党委
Owner ANYANG IRON & STEEL
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