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Perforated plugs for the manufacture of seamless pipes

A perforated plug and seamless pipe technology, applied in the field of perforated plugs for seamless pipe manufacturing, can solve the problems of high cost, quality deviation, etc., and achieve the effect of improving ductility

Active Publication Date: 2020-04-03
신호코쿠머티리얼가부시키가이샤
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although these inventions succeeded in prolonging the life of the piercing plug, there were problems such as high cost and variation in quality.

Method used

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  • Perforated plugs for the manufacture of seamless pipes
  • Perforated plugs for the manufacture of seamless pipes
  • Perforated plugs for the manufacture of seamless pipes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] After casting a piercing plug having an outer diameter of 185 mm having the composition shown in Table 1, carbide aggregation treatment was performed by heating at 700 to 750° C. for 5 hours in an electric furnace. In some comparative examples, the carbide aggregation treatment was not performed. Then, the furnace was kept at 1000° C. for 4 hours in a combustion gas atmosphere having a CO concentration of 1%, and then furnace cooled to perform scale-providing treatment.

[0074] Using the obtained perforated plugs with scale formed on the surface, 13Cr stainless steel pipes were produced, and the lifetime was evaluated. The results are shown in Table 2. The damage of the perforated plug of the comparative example is head melting loss, cracking damage, and wrinkling of the body, and the service life is short, but the damage of the perforated plug of the present invention is only the head melting loss, and the service life is also greatly extended.

[0075] Table 1

[...

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Abstract

The invention provides a piercing point for seamless pipe manufacturing. The piercing point has the advantages of improved high temperature strength, properties of oxide scales, ductile property, toughness, and thermal cracking resistant property, and long service life. The surface of the piercing point is covered by oxide scale. The piercing point is characterized in that the piercing point other than the oxide scales is composed of the following components in percentage by weight: 0.10 to 0.25% of C, 0.05 to 0.80% of Si, 0.20 to 1.00% of Mn, 2.5 to 3.5% of Ni, 1.0 to 2.0% of Cr, 2.5 to 3.5% of Mo, 2.5 to 3.5% of W, 0.07 to 0.40% of Nb, 0.03 to 0.40% of Ti, and the balance being Fe and inevitable impurities. The texture of the piercing point other than the oxide scales comprises 1 to 10% of carbides and martensite.

Description

technical field [0001] The present invention relates to a piercing plug for manufacturing seamless pipes used in the manufacture of seamless pipes by the Mannesmann piercing method, and more particularly to a piercing plug with an extended life. Background technique [0002] Oil well pipes are mainly manufactured by the Mannesmann perforation method. Piercing plugs used for piercing are exposed to the harshest conditions of use among tools. In recent years, stainless steel and high alloys with high deformation resistance in hot state have been used for seamless pipes. As a result, the life of piercing plugs has been decreasing. In extreme cases, one pass of piercing has become the limit. [0003] Regarding the extension of the life of the piercing plug, there have been reports that the life is improved by surface modification using PTA surfacing and arc spraying. [0004] Patent document 1 discloses a kind of iron wire material mainly composed of Fe by arc spraying on the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/50
Inventor 横沟勇太小奈浩太郎
Owner 신호코쿠머티리얼가부시키가이샤
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