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High-strength and high-plasticity bolting steel for supporting in coal mines and manufacturing method thereof

A high-strength, high-plasticity technology, applied in the field of alloy steel, can solve the problems of high energy consumption, low steel cost, high production efficiency, and achieve the effects of low energy consumption, low production cost, and improved yield strength and tensile strength

Inactive Publication Date: 2015-03-11
CENT IRON & STEEL RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a kind of high-strength, high-plastic anchor steel for coal mine support and its manufacturing method, which solves the low strength of the existing hot-rolled anchor steel and the cost and energy consumption of the heat-treated anchor steel. High disadvantage, this steel has high production efficiency, low production cost, simple production process, and good comprehensive mechanical properties

Method used

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  • High-strength and high-plasticity bolting steel for supporting in coal mines and manufacturing method thereof

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Experimental program
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Effect test

Embodiment 1

[0017] Embodiment 1: The chemical composition of the anchor rod steel of the present invention is C: 0.24 by weight percentage (wt.%); Si: 0.79; Mn: 2.02; Cr: 0.46; Ni: 0.48; Mo: 0.39, B : 0.001; S: 0.006, P: 0.008, the balance being Fe and unavoidable impurities. Manufacturing process: converter smelting, LF refining, billet continuous casting, heating in a heating furnace at 1250°C, rolling in a bar and wire rolling mill, starting rolling temperature at 1100°C, finishing rolling temperature at 880°C, rolling specification Φ20mm, air cooling after rolling.

Embodiment 2

[0018] Embodiment 2: The chemical composition of the present invention is C: 0.16; Si: 1.10; Mn: 2.40; Cr: 0.48; Ni: 0.60; Mo: 0.40, B: 0.0015; , the balance is Fe and unavoidable impurities. Manufacturing process: converter smelting, LF refining, billet continuous casting, heating in a heating furnace at 1250°C, rolling in a bar and wire rolling mill, starting rolling temperature at 1100°C, finishing rolling temperature at 850°C, rolling specification Φ20mm, air cooling after rolling.

Embodiment 3

[0019] Embodiment 3: The chemical composition of the present invention is C: 0.25; Si: 0.80; Mn: 2.1; Cr: 0.38; Ni: 0.50; Mo: 0.32, B: 0.0010; , the balance is Fe and unavoidable impurities. Manufacturing process: converter smelting, LF refining, billet continuous casting, heating in a heating furnace at 1250°C, rolling in a bar and wire rolling mill, starting rolling temperature at 1100°C, finishing rolling temperature at 850°C, rolling specification Φ20mm, air cooling after rolling.

[0020] The test results of the mechanical properties of the embodiments are shown in Table 1.

[0021] Table 1 embodiment mechanical property testing result

[0022]

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Abstract

The invention relates to a high-strength and high-plasticity bolting steel for supporting in coal mines and a manufacturing method thereof, and belongs to the technical field of alloy steel. The bolting steel comprises the following chemical components by weight percent: 0.15-0.35wt% of C, 0.60-1.20wt% of Si, 2.00-2.50wt% of Mn, 0.30-0.80wt% of Cr, 0.40-0.80wt% of Ni, 0.30-0.60wt% of Mo, 0.0008-0.002wt% of B, 0-0.010wt% of S, 0-0.020wt% of P and the balance of Fe and unavoidable impurities. The manufacturing method comprises the following steps: converter or electric furnace smelting, external refining, square billet continuous casting, heating, bar and wire rolling mill rolling, and air-cooling to the room temperature. According to the compounds and technology, a bainite-martensite-retained austenite duplex structure can be obtained through rolled products, the yield strength of the material is greater than 1000 MPa, the tensile strength of the material is greater than 1300 MPa, and the elongation rate of the material is greater than 15%. The bolting steel is low in product cost and good in comprehensive performance without heat treatment.

Description

technical field [0001] The invention belongs to the technical field of alloy steel, and in particular relates to a high-strength and high-plastic anchor steel for coal mine support and a manufacturing method thereof. Background technique [0002] With the continuous increase of coal mining depth, roadway support is becoming more and more difficult, and the improvement of mechanized mining in mines has caused the roadway section to continue to expand. There is an urgent need for new anchor steels with high strength and high plasticity. At present, hot-rolled low-alloy high-strength rebar anchor rods with a diameter of 18-22mm are generally used in my country. The yield strength is generally lower than 600MPa, and the heat treatment process of quenching and tempering is often used for those exceeding 700MPa, which consumes a lot of energy and high production costs. , the comprehensive mechanical properties are poor and it is difficult to obtain high strength and high plasticity...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C21D8/06
Inventor 雍岐龙梁小凯孙新军李昭东
Owner CENT IRON & STEEL RES INST