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Method for manufacturing hollow steel with lined pipe by machine drilling and hot rolling

A technology of mechanical drilling and lining pipe, which is applied in the direction of manufacturing tools, boring/drilling, drilling/drilling equipment, etc. Rolling steel compression ratio limitation and other issues, to achieve the effect of dense organization, improved purity, and improved fatigue life

Inactive Publication Date: 2010-01-13
SHOUGANG GUIYANG SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 2) If alloy steel pipe is used, it will increase the difficulty of controlling the pouring temperature because the melting point of the steel pipe and the billet are very close;
[0005] 3) Due to the slender shape of the ingot, it is difficult to effectively remove the gas and inclusions in the molten steel, and it is difficult to guarantee the purity of the material of the ingot;
[0006] 4) The low-magnification structure of the steel ingot is poor;
[0007] 5) The cross-sectional size of the steel ingot is limited (generally, the opposite side is ≤150mm), and the compression ratio of the rolled steel is limited

Method used

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Embodiment Construction

[0019] Below in conjunction with specific embodiment, the present invention will be further described, and concrete process is as follows:

[0020] 1) Cast the base body into square, hexagonal, cylindrical and other bar-shaped steel ingots or continuous casting billets according to known conventional steelmaking methods, or roll or forge the base body into cylindrical, square, etc. according to known conventional methods bar shaped steel;

[0021] 2) According to the specific specifications of the hollow steel and the size of the selected substrate, drill or bore a through hole in the center of the substrate according to the known mechanical deep hole drilling method;

[0022] 3) inserting a steel pipe whose outer diameter is 0.1-2.0 mm smaller than the diameter of the through hole into the through hole according to a conventional method;

[0023] 4) inserting a mandrel rod whose diameter is 0.2-2.0mm smaller than the inner diameter of the steel pipe and made of austenitic st...

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Abstract

The invention discloses a method for manufacturing hollow steel with a lined pipe by machine drilling and hot rolling, belonging to the production method of the hollow steel in steel drilling industry. The invention aims to provide a production method of hollow steel with a lined pipe, which has a matrix with hardly unlimited size and stable quality. The method comprises steps of manufacturing the matrix, machine-drilling a through hole, inserting a mandril, carrying out hot rolling and drawing out the mandril, wherein one steel pipe is inserted into the through hole after the machine drilling, and the mandril is inserted in the steel pipe. The invention has the advantages of compact matrix texture, good product performance, stable quality, and the like, thereby being an ideal method for manufacturing hollow steel with a line pipe, which is used for rock-drilling rods, in particular small-dimension rock-drilling rods.

Description

Technical field: [0001] The invention relates to a production method of hollow steel for rock drilling rods, in particular to a production method of hollow steel with an inner liner pipe; the production method of hollow steel belongs to the drilling steel industry. Background technique: [0002] As we all know, there are two main types of hollow steel for rock drilling rods: hollow steel without liner and hollow steel with liner. At present, the hollow ingot hot rolling method is mainly used to produce hollow steel with lined pipe, which is usually used to manufacture hollow steel with small specifications (≤R32, H32, especially H22); The steel pipe made of high-quality material is fixed in the center of the casting mold, and the molten steel is cast to form a hollow steel ingot with a liner. After cooling, an austenitic steel mandrel is inserted, heated and rolled to form a hollow steel with a mandrel, and the mandrel is drawn out after cooling. The hollow ingot hot rollin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/06B23B41/02
Inventor 王筑生张吉舟汪凌松熊家泽吴疆薛文涛刘厚权张波黄雄黄维
Owner SHOUGANG GUIYANG SPECIAL STEEL
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