STEEL PIPE AND STEEL SHEET
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Applicant
NIPPON STEEL CORPORATION
Representative
Vossius & Partner Patentanwälte Rechtsanwälte mbB
Application number
EP18923989A1
Kind
A1
Document number
3816311
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STEEL PIPE AND STEEL SHEET

3816311 - EP18923989A1 - EPO

Application Jun 29, 2018 - Publication May 05, 2021

SHINOHARA Yasuhiro HARA Takuya EBIHARA Kiyoshi TSUTSUI Kazuteru HATTORI Yutaka ABE Nozomu HASHIMOTO Akira

Abstract

This steel pipe has a base material portion composed of a tubular steel plate having a predetermined chemical composition and a welded part that is provided at a butt portion of the steel plate and extends in the longitudinal direction of the steel plate, an internal microstructure includes 85% or more of one or both of granular bainite and bainite in terms of the total area ratio and includes 1.0% or less of an MA in terms of the area ratio, the internal microstructure has a maximum hardness of 248 Hv or less and an average hardness of 170 to 220 Hv, the base material portion has a texture having an integration degree of {100}<110> of 1.5 or more in a plane parallel to a plate surface at a 1/4 position of a plate thickness from the surface in a plate thickness direction, a surface layer area microstructure includes 95% or more of one or both of granular bainite and tempered bainite in terms of the total area ratio, the surface layer area microstructure has a maximum hardness of 250 Hv or less, and the steel plate has a plate thickness of 15 mm or less.

Description

Claims

Patent References

Patent Publication Date Title
JPS63001369B N/A N/A
JPS62112722B N/A N/A
JPH06256842B N/A N/A
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