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Piercer plug material for producing seamless steel tube, and method for producing said material

A technology of seamless steel pipe and manufacturing method, which is applied in the directions of manufacturing tools, metal rolling, metal rolling, etc., can solve the problems such as the unusable plug of the piercer

Active Publication Date: 2015-06-03
신호코쿠머티리얼가부시키가이샤 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Piercer plugs that have produced such "spontaneous cracks" cannot be used in the manufacture of seamless steel pipes

Method used

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  • Piercer plug material for producing seamless steel tube, and method for producing said material
  • Piercer plug material for producing seamless steel tube, and method for producing said material
  • Piercer plug material for producing seamless steel tube, and method for producing said material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～6

[0194] Examples 1 to 6, namely, the blanks for piercer plugs under the heat treatment conditions 3-1, 3-2, and 6-3 of the present invention, regardless of the difference in the composition of steel 1 and steel 2, even if kept in the atmosphere for 30 days Also, none of the spontaneous cracks occurred. On the other hand, the blanks for piercer plugs of Comparative Examples 1 and 2, that is, the heat treatment condition A, spontaneously cracked from the 14th day, and 16 spontaneous cracks (80%) were confirmed after 30 days. No spontaneous cracks were confirmed in the blanks for piercer plugs under heat treatment conditions 3-1, 3-2, and 6-3. From the above, it was confirmed that the dehydrogenation effect of the present invention suppresses spontaneous cracking.

[0195] table 5

[0196]

[0197] [Machinability]

[0198] Prepare one blank for the piercer plug of steel 2 heat-treated under heat treatment conditions 3-1, 3-2, 6-3 and A, and drill the core part of the piercer plug. No...

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PUM

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Abstract

The present invention provides a piercer plug material for producing a seamless steel tube, the piercer plug being a plug for a seamless steel tube produced by means of the Mannesmann process, and exhibiting excellent season cracking resistance and machinability. The piercer plug material contains, in mass%, 0.08 to 0.3% of C, 0.1 to 1.0% of Si, 0.2 to 1.5% of Mn, 0.2 to 2.0% of Ni, and a total of 1.5 to 8% of W and / or Mo, the remainder being Fe and impurities, wherein the amount of diffusible hydrogen contained as impurities is restricted to 2 ppm or less. The piercer plug material has a hardness between HRC 6 and 40, inclusive.

Description

Technical field [0001] The present invention relates to a piercer plug (sometimes simply referred to as a "plug") used in the manufacture of seamless steel pipes by the Mannesmann method, and in particular to spontaneous crack resistance and machinability Excellent blank for piercing machine plug for seamless steel pipe manufacturing and its manufacturing method. Background technique [0002] In recent years, as the oil drilling environment has become severe, high-quality seamless steel pipes made of stainless steel and high-alloy steel are required as oil well pipes. However, when a seamless steel pipe is made of a material with high deformation resistance such as stainless steel, the tip of the piercer plug used for the piercing is subjected to a high surface pressure, and the tip is melted, and it must be replaced in a short time. [0003] Therefore, as disclosed in Patent Document 1, the conventional piercer plug for the manufacture of high-grade seamless steel pipes increases...

Claims

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Application Information

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IPC IPC(8): C22C38/00B22C9/22C21D1/32C21D3/06C21D9/00C22C38/12C22C38/54
CPCB22C9/22C21D8/105C21D9/08C21D9/085C21D2211/002C21D2211/008C22C38/005C22C38/02C22C38/04C22C38/42C22C38/44B21B25/00C22C38/08C22C38/12C22C38/16C22C38/48
Inventor 小奈浩太郎横沟勇太日高康善中西哲也
Owner 신호코쿠머티리얼가부시키가이샤
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