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High-strength full-thread equal-strong resin bolting reinforcing bar and production method thereof

A production method and full-thread technology are applied in the field of micro-alloyed roadway support steel, which can solve the problems such as the inability to meet the needs of the development of bolt support technology and the difficulty of bolt support, so as to increase the safety reserve, The effect of reducing support cost and increasing structural strength

Active Publication Date: 2014-04-23
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high ground stress, high rock burst and large rheology of surrounding rock brought about by deep mining, it has caused serious difficulties in the bolt support of coal roadways
At present, the strength of hot-rolled resin anchor bolts used in coal mine shaft and tunnel support is mostly 335MPa and 400MPa ordinary anchor bolts, but they can no longer meet the needs of the development of bolt support technology.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Control the chemical composition of molten steel: 0.21wt% of C, 0.40wt% of Si, 1.44wt% of Mn, 0.068wt% of V, 0.025wt% of P, 0.021wt% of S, the rest is Fe and unavoidable Impurities.

[0032] The production process is: converter smelting, ladle argon blowing, continuous casting, rolling process, wherein, in the converter smelting process, vanadium-nitrogen alloy is used for microalloying, and high-strength supplementary blowing is used in the smelting process. The control end point [C] is 0.14wt%, using silicon-calcium-barium for deoxidation, wherein the amount of silicon-calcium-barium added is 1.05kg / t 钢 During the process of putting steel into the steel stream, the vanadium-nitrogen alloy is added into the steel flow impact zone of the ladle along with the steel stream at the later stage of adding the silicon-manganese alloy and ferrosilicon alloy; Perform soft blowing operation, argon blowing time is 9.5min; in the continuous casting process, the average temperature...

Embodiment 2

[0034] Control the chemical composition of molten steel: 0.19wt% of C, 0.37wt% of Si, 1.40wt% of Mn, 0.070wt% of V, 0.021wt% of P, 0.014wt% of S, the rest is Fe and unavoidable Impurities.

[0035] The production process is: converter smelting, ladle argon blowing, continuous casting, rolling process, wherein, in the converter smelting process, vanadium-nitrogen alloy is used for microalloying, and high-strength supplementary blowing is used in the smelting process. The control end point [C] is 0.12wt%, using silicon aluminum barium calcium deoxidation, the addition of silicon aluminum barium calcium is 1.40kg / t 钢 During the process of putting steel into the steel stream, the vanadium-nitrogen alloy is added into the steel flow impact zone of the ladle along with the steel stream at the later stage of adding the silicon-manganese alloy and ferrosilicon alloy; Carry out "soft blowing" operation, argon blowing time is 8.5min; in the continuous casting process, the average tempe...

Embodiment 3

[0037] Control the chemical composition of molten steel: 0.23wt% of C, 0.52wt% of Si, 1.45wt% of Mn, 0.066wt% of V, 0.017wt% of P, 0.023wt% of S, the rest is Fe and unavoidable Impurities.

[0038] The production process is: converter smelting, ladle argon blowing, continuous casting, rolling process, wherein, in the converter smelting process, vanadium-nitrogen alloy is used for microalloying, and high-strength supplementary blowing is used in the smelting process. The control end point [C] is 0.14wt%, using a mixture of silicon-calcium-barium and silicon-aluminum-barium-calcium for deoxidation, wherein the amount of the mixture added is 1.20kg / t 钢 During the process of putting steel into the steel stream, the vanadium-nitrogen alloy is added into the steel flow impact zone of the ladle along with the steel stream at the later stage of adding the silicon-manganese alloy and ferrosilicon alloy; Carry out soft blowing operation, argon blowing time is 8min; in the continuous ca...

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Abstract

The invention provides a high-strength full-thread equal-strong resin bolting reinforcing bar and a production method thereof. The high-strength full-thread equal-strong resin bolting reinforcing bar comprises the following chemical components: 0.18-0.27wt% of C, 0.30-0.75wt% of Si, 1.35-1.60wt% of Mn, 0.06-0.09wt% of V, less than or equal to 0.035wt% of P, less than or equal to 0.035wt% of S and the balance of Fe and inevitable impurities. During a smelting process, a vanadium nitrogen alloy is micro-alloyed, so as to increase the strength and toughness of the reinforcing bar. Due to the high strength of the high-strength full-thread equal-strong resin bolting reinforcing bar according to the invention, the steel material can be saved, the shoring cost is lowered, the structure strength is enhanced and the safety storage is increased.

Description

technical field [0001] The invention belongs to the field of steel for micro-alloyed roadway support. Specifically, the invention relates to a steel anchor bar and a production method thereof, in particular to a vanadium-nitrogen micro-alloyed full-thread equal-strength resin anchor bar and its production method. Background technique [0002] Coal roadway bolt support technology has developed extremely rapidly in recent years. Hot-rolled resin anchor bars are mainly used in the bolt support of coal mine wells and tunnels, and bolt support is an important support technology widely used. This support system has obvious advantages in improving the roadway support effect, ensuring the safety of the roadway, reducing the labor intensity of workers, and simplifying the maintenance process of the end area of ​​the coal mining face, which is very conducive to the rapid advancement of the coal mining face. Realize the high production and high efficiency of the mine. [0003] With ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/12C22C33/06C21C7/06
Inventor 李雪峰杜传治梁辉
Owner LAIWU IRON & STEEL GRP
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