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Title: Production of high strength TMCP steel plate for offshore structures

Abstract

Titanium-oxide bearing steel (Ti-O steel), which has improved toughness in the heat-affected zone (HAZ) by utilizing intragranular ferrite (IGF), has been developed, and successfully put into commercial production. This was also the first application of yield strength (YS) 420 N/mm{sup 2} class TMCP steel plates to offshore structures. In the Ti-O steel, IGF grows radially from Ti-oxides finely dispersed in the steel as nuclei when HAZ transforms from austenite to ferrite after welding, and thus the microstructure of the HAZ is remarkably refined. As Ti-oxide particles are chemically stable even in the region near the fusion line which was reheated to a high-temperature above 1,350 C, control of the microstructure is possible in the entire HAZ and excellent crack tip opening displacement (CTOD) properties can be obtained. By applying Ti-O steel, Nippon Steel has succeeded in the mass production (approximately 9,000 tons) of YS 420 N/mm{sup 2} class TMCP steel plate for offshore structures in the North Sea. In addition to high strength and strict CTOD properties, various other properties including low carbon equivalent, narrow YS range, etc., were required for this plate. In order to satisfy these requirements, it was necessary to take comprehensive measured in the entire productionmore » process including steel making, continuous casting and plate rolling. The Ti-O steel with low carbon equivalent satisfies the required strength and low-temperature toughness of the base material and exhibits excellent toughness in the CTOD and Charpy tests of the welded joints, and offers good field weldability. Furthermore, the YS was controlled within a narrow range of less than 100 N/mm{sup 2} by strictly controlling the range of chemical composition and the TMCP condition.« less

Authors:
; ; ; ; ;  [1];  [2]
  1. Nippon Steel Corp., Kimitsu City (Japan)
  2. Nippon Steel Corp., Tokyo (Japan). Plate Technical Div.
Publication Date:
OSTI Identifier:
33203
Report Number(s):
CONF-930641-
ISBN 0-7918-0785-1; TRN: IM9518%%24
Resource Type:
Book
Resource Relation:
Conference: OMAE `93: 12th international conference on offshore mechanics and arctic engineering, Glasgow (United Kingdom), 20-24 Jun 1993; Other Information: PBD: 1993; Related Information: Is Part Of OMAE 1993: Volume 3, Part A -- Materials engineering; Salama, M.M.; Toyoda, Masao; Liu, S.; Dos Santos, J.F.; Kocak, M.; Williams, J. [eds.]; PB: 434 p.
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; MANGANESE STEELS; PRODUCTION; WELDED JOINTS; MECHANICAL PROPERTIES; OFFSHORE PLATFORMS; TITANIUM ADDITIONS; AUSTENITE; FERRITES; MICROSTRUCTURE; CHEMICAL COMPOSITION; CASTING; ROLLING; CHARPY TEST; TENSILE PROPERTIES; HARDNESS; HEAT AFFECTED ZONE; FRACTURE MECHANICS; EXPERIMENTAL DATA

Citation Formats

Yoshida, Yuzuru, Tamehiro, Hiroshi, Chijiiwa, Rikio, Funato, Kazuo, Doi, Naoki, Tanaka, Kazuaki, and Kibe, Masaomi. Production of high strength TMCP steel plate for offshore structures. United States: N. p., 1993. Web.
Yoshida, Yuzuru, Tamehiro, Hiroshi, Chijiiwa, Rikio, Funato, Kazuo, Doi, Naoki, Tanaka, Kazuaki, & Kibe, Masaomi. Production of high strength TMCP steel plate for offshore structures. United States.
Yoshida, Yuzuru, Tamehiro, Hiroshi, Chijiiwa, Rikio, Funato, Kazuo, Doi, Naoki, Tanaka, Kazuaki, and Kibe, Masaomi. Fri . "Production of high strength TMCP steel plate for offshore structures". United States.
@article{osti_33203,
title = {Production of high strength TMCP steel plate for offshore structures},
author = {Yoshida, Yuzuru and Tamehiro, Hiroshi and Chijiiwa, Rikio and Funato, Kazuo and Doi, Naoki and Tanaka, Kazuaki and Kibe, Masaomi},
abstractNote = {Titanium-oxide bearing steel (Ti-O steel), which has improved toughness in the heat-affected zone (HAZ) by utilizing intragranular ferrite (IGF), has been developed, and successfully put into commercial production. This was also the first application of yield strength (YS) 420 N/mm{sup 2} class TMCP steel plates to offshore structures. In the Ti-O steel, IGF grows radially from Ti-oxides finely dispersed in the steel as nuclei when HAZ transforms from austenite to ferrite after welding, and thus the microstructure of the HAZ is remarkably refined. As Ti-oxide particles are chemically stable even in the region near the fusion line which was reheated to a high-temperature above 1,350 C, control of the microstructure is possible in the entire HAZ and excellent crack tip opening displacement (CTOD) properties can be obtained. By applying Ti-O steel, Nippon Steel has succeeded in the mass production (approximately 9,000 tons) of YS 420 N/mm{sup 2} class TMCP steel plate for offshore structures in the North Sea. In addition to high strength and strict CTOD properties, various other properties including low carbon equivalent, narrow YS range, etc., were required for this plate. In order to satisfy these requirements, it was necessary to take comprehensive measured in the entire production process including steel making, continuous casting and plate rolling. The Ti-O steel with low carbon equivalent satisfies the required strength and low-temperature toughness of the base material and exhibits excellent toughness in the CTOD and Charpy tests of the welded joints, and offers good field weldability. Furthermore, the YS was controlled within a narrow range of less than 100 N/mm{sup 2} by strictly controlling the range of chemical composition and the TMCP condition.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1993},
month = {12}
}

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