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Super duplex stainless steel seamless steel tube and preparation method

A duplex stainless steel and seamless steel pipe technology, applied in the direction of pipes, rigid pipes, mechanical equipment, etc., can solve the problems of difficult manufacturing and achieve the effects of improving surface quality, reducing pollution, and reducing corrosion rate

Active Publication Date: 2013-10-23
JIANGSU YINHUAN PRECISION STEEL TUBE CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, when S32750 super duplex stainless steel stays between 600-1000 ° C, intermetallic phases or carbonitrides are precipitated along the grain boundaries or within the grains, such as σ phase, χ phase, M23C6 and Cr2N, etc., where σ is relative to the performance of stainless steel The impact is the most serious, so it is very difficult to manufacture

Method used

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  • Super duplex stainless steel seamless steel tube and preparation method

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Embodiment 1

[0031] This embodiment is a U-shaped seamless nickel-chromium-iron alloy heat transfer tube for a nuclear power steam generator. Its chemical composition and mass percentage are: C: 0.0156%, Mn: 0.652%, P: 0.0287%, S: 0.0005%, Si : 0.44%, Ni: 6.32%, Cr: 25.35%, Mo: 3.36%, N: 0.289%, Cu: 0.125%, and the balance Fe.

[0032] The preparation method of the super duplex stainless steel seamless steel pipe of this embodiment is carried out according to the following procedures: round steel inspection—hot piercing—pickling—inspection and grinding—the first cold rolling—deoiling—the first solution treatment—straightening - pipe cutting - pickling - inspection and grinding - the second cold rolling - degreasing - second solution treatment - straightening - pipe cutting - pickling - inspection and grinding - welding head - lubrication - cold drawing - degreasing - the first Three solid solution treatment - straightening - pipe cutting - pickling - inspection and grinding - the third col...

Embodiment 2

[0044] This embodiment provides a U-shaped seamless nickel-chromium-iron alloy heat transfer tube for a nuclear power steam generator. Its chemical composition and mass percentage are: C: 0.015%, Mn: 0.66%, P: 0.028%, S: 0.0004%, Si : 0.5%, Ni: 6.3%, Cr: 25.3%, Mo: 3.3%, N: 0.29%, Cu: 0.12%, and the balance Fe.

[0045] The preparation method of the super duplex stainless steel seamless steel pipe of this embodiment is carried out according to the following procedures: round steel inspection—hot piercing—pickling—inspection and grinding—the first cold rolling—deoiling—the first solution treatment—straightening - pipe cutting - pickling - inspection and grinding - the second cold rolling - degreasing - second solution treatment - straightening - pipe cutting - pickling - inspection and grinding - welding head - lubrication - cold drawing - degreasing - the first Three solid solution treatment - straightening - pipe cutting - pickling - inspection and grinding - the third cold r...

Embodiment 3

[0057] This embodiment provides a U-shaped seamless nickel-chromium-iron alloy heat transfer tube for a nuclear power steam generator. Its chemical composition and mass percentage are: C: 0.016%, Mn: 0.65%, P: 0.029%, S: 0.0006%, Si : 0.4%, Ni: 6.4%, Cr: 25.4%, Mo: 3.4%, N: 0.28%, Cu: 0.13%, and the balance is Fe.

[0058] The preparation method of the super duplex stainless steel seamless steel pipe of this embodiment is carried out according to the following procedures: round steel inspection—hot piercing—pickling—inspection and grinding—the first cold rolling—deoiling—the first solution treatment—straightening - pipe cutting - pickling - inspection and grinding - the second cold rolling - degreasing - second solution treatment - straightening - pipe cutting - pickling - inspection and grinding - welding head - lubrication - cold drawing - degreasing - the first Three solid solution treatment - straightening - pipe cutting - pickling - inspection and grinding - the third col...

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Abstract

The invention relates to a super duplex stainless steel seamless steel tube and a preparation method. The super duplex stainless steel seamless steel tube comprises the following chemical components in percentage by weight: 0.015-0.016% of C, 0.65-0.66% of Mn, 0.028-0.029% of P, 0.0004-0.0006% of S, 0.4-0.5% of Si, 6.3-6.4% of Ni, 25.3-25.4% of Cr, 3.3-3.4% of Mo, 0.28-0.29% of N, 0.12-0.13% of Cu and the balance of Fe. The super duplex stainless steel seamless steel tube has the advantages that the pittingresistance, the crevice corrosion resistance and the intercrystalline corrosion resistance are very high, the corrosion rates in organic acid and inorganic acid are low, and intermetallic phases or carbonitride cannot be separated along crystal boundaries or in a transgranular manner when staying at the temperature of 600 to 1000 DEG C.

Description

technical field [0001] The invention relates to a seamless steel pipe and a manufacturing method thereof, in particular to a super duplex stainless steel seamless steel pipe and a manufacturing method thereof. Background technique [0002] Duplex steel has been industrially produced and applied since 1930. After more than 70 years of development and improvement, it has now developed into the third generation of duplex stainless steel represented by S32750. The common characteristics of the third generation of stainless steel are low carbon, high molybdenum and high Nitrogen has excellent resistance to pitting corrosion (anti-pitting corrosion equivalent PREN>40), resistance to stress corrosion and crevice corrosion. The third generation duplex stainless steel is also called super duplex stainless steel. After nearly 20 years of research and development and industrial production, S32750 duplex stainless steel seamless steel pipe has been included in ASTM and EN standards....

Claims

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Application Information

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IPC IPC(8): C22C38/44F16L9/02C21D9/08C21D8/10
Inventor 庄建新
Owner JIANGSU YINHUAN PRECISION STEEL TUBE CO LTD
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