Title:
STEEL PIPE WITH INNER SURFACE GROOVE HAVING EXCELLENT TRANSPORTABILITY AND METHOD FOR MANUFACTURING THE SAME
Document Type and Number:
Japanese Patent JP2020152967
Kind Code:
A
Abstract:
To provide a steel pipe with inner surface groove that does not cause cracks in the welded part and in which, on the inner surface, a plurality of recesses are present in a continuous straight line shape to the longitudinal direction.SOLUTION: The steel pipe with inner surface groove contains C: 0.2 mass% or more and 1.2 mass% or less, and P: 0.03 mass% or less, and in which the metallic structure of the welded part contains reheat-treated ferrite and carbide, and the particle size of the non-metallic inclusions contained in the steel pipe including the welded part is 20 μm or less, and, on the inner surface, a plurality of recesses are formed in a continuous straight-line shape to the longitudinal direction.SELECTED DRAWING: None
Inventors:
AKIZUKI MAKOTO
MIMACHI SHOHEI
KUROBE ATSUSHI
MIMACHI SHOHEI
KUROBE ATSUSHI
Application Number:
JP2019053412A
Publication Date:
September 24, 2020
Filing Date:
March 20, 2019
Export Citation:
Assignee:
NIPPON STEEL NISSHIN CO LTD
International Classes:
C22C38/00; B21C37/08; B21C37/20; B23K13/00; C21D9/08; C21D9/50