Anchor rod steel for coal mines and production method thereof

A production method and bolt steel technology, applied in the metallurgical field, can solve the problems of waste of resources, high production cost, unreasonable chemical composition design, etc., and achieve the effect of saving energy and simplifying the process

Active Publication Date: 2015-03-25
WUHU XINXING DUCTILE IRON PIPES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the metal rod body of the anchor rod is rolled and fitted with trays and nuts, or the finished thread is fitted with trays and nuts. The metal rod body is generally produced by hot rolling. The process flow is converter smelting→refining furnace→continuous casting→billet inspection→ Heating in the heating furnace → rolling in the rolling mill → finishing and collection, the production cost is high, the chemical composition design is unreasonable, the waste of resources is serious, and it does not meet the needs of the development of an economical society

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A bolt steel for coal mines, composed of the following elements by mass percentage: C: 0.22%, Si: 0.47%, Mn: 1.43%, V: 0.075%, P: 0.033%, S: 0.017%, Cr: 0.029% , Ni: 0.011%, Cu: 0.032%, and the balance is Fe and impurity elements.

[0024] The production method of present embodiment coal mine anchor rod steel comprises the following steps:

[0025] (1) Converter smelting process: ordinary carbon structural steel 20MnSi is used as billet material, smelted by conventional steelmaking process, the mass percentage of carbon at the end point of the converter is controlled to be 0.12%, and the end point temperature of the converter is 1660°C-1680°C , to ensure that the tapping temperature meets the casting temperature requirements of continuous casting;

[0026] (2) Ladle vanadium microalloying process: 45t of molten steel, first add 40kg of silicon aluminum barium and 20kg of aluminum ingot deoxidizer when tapping 1 / 3 of the steel, and then add vanadium nitrogen alloy, when...

Embodiment 2

[0032] A bolt steel for coal mines, composed of the following elements by mass percentage: C: 0.25%, Si: 0.70%, Mn: 0.85%, V: 0.025%, P: 0.040%, S: 0.040%, Cr: 0.10% , Ni: 0.10%, Cu: 0.15%, and the balance is Fe and impurity elements.

[0033] The production method of present embodiment coal mine anchor rod steel comprises the following steps:

[0034] (1) Converter smelting process: ordinary carbon structural steel 20MnSi is used as billet material, and conventional steelmaking process is used for smelting. The carbon at the end point of the converter is 0.04%, and the end point temperature of the converter is 1660°C-1680°C;

[0035] (2) Ladle vanadium microalloying process: 45t of molten steel, first add 40kg of silicon aluminum barium and 20kg of aluminum ingot deoxidizer when tapping 1 / 3 of the steel, and then add vanadium nitrogen alloy, when the 2 / 3 of tapping is completed, the feeding During the steel process, the ladle is guaranteed to be softly blown throughout, and ...

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Abstract

The invention provides anchor rod steel for coal mines. The anchor rod steel is composed of the following elements according to mass percent: 0.20-0.25% of C, 0.85-1.55% of Mn, 0.40-0.70% of Si, 0.025-0.095% of V, not larger than 0.040% of P, not larger than 0.040% of S, not larger than 0.10% of Cr, not larger than 0.10% of Ni, not larger than 0.15% of Cu and the balance of Fe and impurity elements. The invention further provides a production method of the anchor rod steel for coal mines. The production method adopts a technological process of converter refining, vanadium in steel micro-alloying, full protection casting, billet checking, heating in a heating furnace, continuous rolling and rapid cooling after rolling, a refining procedure is omitted, thereby not only simplifying the procedures, but also saving the energy resources, and the anchor rod steel produced by the method provided by the invention is characterized in that the yield strength is not smaller than 400 MPa, the tensile strength is smaller than 585 MPa and the stretch rate is not smaller than 18%.

Description

technical field [0001] The invention belongs to the metallurgical industry, and more specifically relates to a bolt steel for coal mines and a production method thereof. Background technique [0002] my country's coal mine roadway support has experienced wood support, masonry support, and steel support. In recent years, due to the increasingly complex requirements of coal mine mining, underground support has become more and more difficult. The requirements for support materials It is also getting higher and higher. Coal mines urgently need underground support materials with low price, good quality and reliable safety performance. Bolt support is the first choice for coal mine roadway support. It has low cost, good support effect, easy operation, It has the advantages of flexible use and less construction headroom. At present, the metal rod body of the anchor rod is rolled and fitted with trays and nuts, or the finished thread is fitted with trays and nuts. The metal rod body ...

Claims

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Application Information

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IPC IPC(8): C22C38/58C22C38/46C22C38/38C22C38/24C22C38/16C22C38/12C22C33/04B22D11/00C21D8/00
Inventor 杨明生郭海昌宋红伟吴新兵朱丽丽陈永峰
Owner WUHU XINXING DUCTILE IRON PIPES
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