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High-strength and ductility steel plate for coal mine machinery and preparation method thereof

Inactive Publication Date: 2020-07-28
NANJING IRON & STEEL CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to meet the mechanical property requirements of high-strength steel, more hardenable elements such as Cr and Mo are added in the alloy addition. While increasing the cost of the alloy, it also inevitably increases the hardness of the hard and brittle phase in the subsequent welding process. The ratio affects its comprehensive performance

Method used

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  • High-strength and ductility steel plate for coal mine machinery and preparation method thereof
  • High-strength and ductility steel plate for coal mine machinery and preparation method thereof
  • High-strength and ductility steel plate for coal mine machinery and preparation method thereof

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Embodiment Construction

[0023] A high-strength and tough steel plate for coal mine machinery, its chemical composition and mass percentage are as follows: C: 0.12% to 0.14%, Si: 0.20% to 0.25%, Mn: 1.5% to 1.6%, P≤0.010%, S≤0.005% , Ni: 0.2% to 0.3%, B: 0.006% to 0.009%, Ti: 0.01% to 0.03%, Zr: 0.01% to 0.03%, N≤0.005%, and the balance is iron Fe and unavoidable impurities.

[0024] The preparation method of the above-mentioned steel plate: converter smelting→LF furnace refining→RH vacuum treatment→continuous casting→slab heating→hot rolling→laminar flow cooling→off-line stack cooling, wherein the thickness of the casting slab is 250mm, and the casting slab is heated to 1250°C , one-stage rolling is carried out on a thick plate rolling mill, the starting rolling temperature is 1100°C, and the final rolling temperature is 880-920°C. After rolling, the steel plate is cooled to ≤300°C at a cooling rate of 25-30°C / s, and then the steel plate The off-line pile is cold.

[0025] Below in conjunction with ...

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Abstract

The invention discloses a high-strength and ductility steel plate for coal mine machinery and a preparation method thereof and relates to the technical field of iron and steel smelting. The high-strength and ductility steel plate for the coal mine machinery comprises following chemical components by mass: 0.12%-0.14% of C, 0.20%-0.25% of Si, 1.5%-1.6% of Mn, less than or equal to 0.010% of P, lessthan or equal to 0.005% of S, 0.2%-0.3% of Ni, 0.006%-0.009% of B, 0.01%-0.03% of Ti, 0.01%-0.03% of Zr, less than or equal to 0.005% of N, and the balance Fe and inevitable impurities. The high-strength and ductility steel plate for the coal mine machinery is prepared by using the one-stage rolling and online quenching process and has the low alloy addition amount and excellent comprehensive mechanical performance. Compared with high-strength and ductility steel plates prepared through an existing two-stage low-temperature rolling process and an offline thermal treatment process, the high-strength and ductility steel plate for the coal mine machinery, provided by the invention, has the advantages of low cost and high added value.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, in particular to a high-strength and tough steel plate for coal mining machinery and a preparation method thereof. Background technique [0002] With the development of the coal mine machinery industry, more than 70% of the steel plates for high-end coal mine hydraulic supports and other structural parts are made of Q690 and above low-alloy high-strength steel. This series of structural steel has the advantages of high strength and good toughness, and can be widely used in key components of coal mine machinery and equipment. In order to meet the mechanical property requirements of high-strength steel, more hardenable elements such as Cr and Mo are added in the alloy addition, which increases the cost of the alloy and inevitably increases the hardness of the hard and brittle phase in the subsequent welding process. The ratio affects its comprehensive performance. At present, with...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/08C22C38/14C22C33/04C21D8/02
CPCC21D8/0205C21D8/0226C21D8/0263C22C33/04C22C38/001C22C38/002C22C38/02C22C38/04C22C38/08C22C38/14
Inventor 闫强军雷晓荣张清辉衣海龙刘通吴俊平冯勇靳建锋杨柳黄彪凯姜金星
Owner NANJING IRON & STEEL CO LTD
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