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Production process of hollow steel for rock drilling tool

A production process and drilling tool technology, which is applied in the production process field of hollow steel for rock drilling tools, to achieve the effects of increasing service life, reducing scrap rate, and improving as-cast structure

Inactive Publication Date: 2013-07-03
SHOUGANG GUIYANG SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the biggest problem restricting the production of "drilling method" is how to improve the straightness of the billet and the purity of molten steel, so as to reduce the reject rate in the drilling process and improve the service life of hollow steel for rock drilling tools

Method used

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  • Production process of hollow steel for rock drilling tool
  • Production process of hollow steel for rock drilling tool

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1. The main chemical composition of hollow steel 55SiMnMo for rock drilling tools is shown in Table 1 by weight percentage:

[0021] Table I

[0022]

[0023] The steel is tapped in an ultra-high power 60t eccentric bottom tapping electric arc furnace with a Consid continuous feeding system. After being refined and reduced in a 60tLF furnace, it is then subjected to VD degassing treatment for 25 minutes; after the VD degassing treatment, argon pressure of 0.28MPa is used. , The flow rate is 90NL / min, and the cover is soft blown for 9 minutes. After calcium treatment, the argon pressure is 0.25MPa, and the flow rate is 65NL / min. The continuous casting machine, the superheat is controlled at 30±5°C, the casting speed is controlled at 1.95-2.30m / min, the tundish baking temperature is 1150°C, the mold liquid level is automatically controlled, with electromagnetic stirring and full protection casting; casting The billet adopts the "steel pusher type slow c...

Embodiment 2

[0025] Embodiment 2: Hollow steel 95CrMo for rock drilling tools. By weight percentage, its main chemical composition is as shown in Table 2:

[0026] Table II

[0027]

[0028] Process control: use the ultra-high power 60t eccentric bottom tapping electric arc furnace with Consdie continuous feeding system to tap steel, after refining and reducing in 60tLF furnace, then go through VD degassing treatment for 30min; after VD degassing treatment, use argon Air pressure 0.28MPa, flow rate 90NL / min for 9 minutes of soft blowing with the lid closed, after calcium treatment, use argon pressure 0.25MPa, flow rate 65NL / min for soft blowing for 12 minutes, then hang the bag to the continuous casting machine for casting; the continuous casting process uses For a continuous casting machine with a cross-section of 150mm×150mm, the superheat is controlled at 30±5°C, the casting speed is controlled at 1.95-2.30m / min, the tundish baking temperature is 1150°C, the mold liquid level ...

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Abstract

The invention discloses a production process of hollow steel for a rock drilling tool, which comprises a smelting procedure and a continuous casting procedure. Through controlling the soft-bubbling argon gas pressure, flow and time in the smelting procedure as well as the casting speed, superheat degree and tundish baking temperature in the continuous casting procedure and adopting the cooling system provided with a clamping device and using the pusher type slow cooling technology, the flatness of the casting blank and the purity of molten steel can be obviously improved, the blank with high purity and flatness can be provided for producing the hollow steel by the hole-drilling method, the flatness of the blank can be controlled within 5 thousandths, the hole-drilling eccentricity ratio is controlled within 3 percent, the rejection ratio of the drilled holes is greatly reduced, and the fatigue strength of the hollow steel for the rock drilling rod is increased, therefore, the service life of the rock drilling rod is prolonged.

Description

[0001] technical field [0002] The invention relates to a production process of steel, in particular to a production process of hollow steel for rock drilling tools, and belongs to the technical field of metallurgy. Background technique [0003] At present, the production of hollow steel for rock drilling tools is mainly carried out by "cast pipe method", "drilling method" and "hot perforation-hot drawing (rolling) method". The piercing-hot drawing (rolling) method” greatly reduces the fatigue strength of the steel due to various metallurgical and processing defects, thereby greatly reducing the service life of the hollow steel. The "drilling method" can eliminate a large number of metallurgical defects in the manufacturing process, so the metallurgical quality of the product is high, and the billet rate is improved after the continuous casting technology is adopted, so the material consumption is low, so this production process is widely used. However, the biggest problem...

Claims

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Application Information

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IPC IPC(8): C22C38/12C22C38/44
Inventor 夏辉华白映林周英豪何勇王翔郑玉龙刘银波陈昌贵代飞叶朗肖丹刘华高皓
Owner SHOUGANG GUIYANG SPECIAL STEEL
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