Nahtloses Stahlrohr, Herstellungsverfahren für Nahtloses Stahlrohr, Druckbehälter und Druckbehälterherstellungsverfahren
Anmelder: JFE Steel Corporation 🇯🇵
Details
- Veröffentlichungs-Nr.
- EP4818349
- Anmeldetag
- 12. Februar 2025
- Veröffentlichung
- 21. August 2025
- Rechtsraum
- EP
Abstract
An object of the present invention is to provide a seamless steel pipe having a high martensite fraction and being thick-walled, and having excellent quench-cracking resistance, which can be extremely suitably used as a member of a pressure vessel and the like. Further, an object thereof is to provide a method for manufacturing a seamless steel pipe, a pressure vessel, and a method for manufacturing a pressure vessel.A seamless steel pipe has a specific component composition and P satisfies the following formula (1), a degree of segregation of Mn at an inner surface of the steel pipe of less than 1.50, and a metallic microstructure having an area fraction of martensite of 85% or more. [P] ≤ 0.042 - 0.002[C] - 0.024[Mn] - 0.001[Mo] - 0.001[Cr] - 0.002[Ni] (where [element] in formula (1) represents a content (mass%) of the element described in the brackets).
Anmelder
- Firma
- JFE Steel Corporation
- Land
- 🇯🇵 Japan
Japanischer Stahlkonzern mit Sitz in Tokio, entstanden aus Fusion von NKK und Kawasaki Steel, tätig in Produktion von Flach- und Langstahlerzeugnissen für Automobil-, Bau- und Schiffbauindustrie.
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