Development of YS 500MPa class TMCP steel plates for offshore structures

Akihiko Kojima; Akihito Kiyose; Yoshio Terada; Atsuhiko Yoshie; Ryuji Uemori; Shuji Aihara; Shiroh Imai; Yuzuru Yoshida; Toshihiko Adachi; Kazuaki Tanaka; Takao Nakashima

Development of YS 500MPa class TMCP steel plates for offshore structures

Akihiko Kojima, Akihito Kiyose, Yoshio Terada, Atsuhiko Yoshie, Ryuji Uemori, Shuji Aihara, Shiroh Imai, Yuzuru Yoshida, Toshihiko Adachi, Kazuaki Tanaka, Takao Nakashima

Research output: Contribution to conference › Paper › peer-review

5 Citations (Scopus)

Abstract

New steel manufacturing technology has been developed to attain excellent crack tip opening displacement (CTOD) properties in a heat affected zone (HAZ) as well as yield strength (YS) of 500MPa in base metal. In the new steels, the HAZ microstructure near a weld fusion line is markedly refined by utilizing not only the formation of intragranular ferrite (IGF) but the strong retardation of austenite (here in after " γ ") grain growth. The IGF grows radially from oxides in the same way as in titanium-oxide bearing steels (TiO steels). The γ grain growth retardation is due to the pinning effect by fine particles including ultrafine oxides. Since these oxides dispersed in the steels are chemically stable even near the fusion line, the microstructure control is possible and the HAZ microstructure can be remarkably refined. Based on the new technology, YS 500MPa class thermomechanical control process (TMCP) steel plates with a low carbon equivalent and a 63.5mm thickness for offshore structures have been manufactured and tested. The steel plates have satisfied the required strength and low-temperature toughness of the base metal. They have also exhibited excellent CTOD properties and Charpy impact properties of joints welded by flux cored arc welding (FCAW) with 0.7kJ/mm and welded by submerged arc welding (SAW) with 3.5kJ/mm, as well as good weldability. The newly developed YS 460MPa and YS 500MPa class TMCP steel plates are being mass produced for offshore structures.

Original language	English
Pages	167-175
Number of pages	9
Publication status	Published - 2001
Externally published	Yes
Event	20th International Conference on Offshore Mechanics and Arctic Engineering; Materials - Rio de Janeiro, Brazil Duration: Jun 3 2001 → Jun 8 2001

Other

Other	20th International Conference on Offshore Mechanics and Arctic Engineering; Materials
Country/Territory	Brazil
City	Rio de Janeiro
Period	6/3/01 → 6/8/01

All Science Journal Classification (ASJC) codes

Ocean Engineering
Energy Engineering and Power Technology
Mechanical Engineering

Cite this

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title = "Development of YS 500MPa class TMCP steel plates for offshore structures",

abstract = "New steel manufacturing technology has been developed to attain excellent crack tip opening displacement (CTOD) properties in a heat affected zone (HAZ) as well as yield strength (YS) of 500MPa in base metal. In the new steels, the HAZ microstructure near a weld fusion line is markedly refined by utilizing not only the formation of intragranular ferrite (IGF) but the strong retardation of austenite (here in after {"} γ {"}) grain growth. The IGF grows radially from oxides in the same way as in titanium-oxide bearing steels (TiO steels). The γ grain growth retardation is due to the pinning effect by fine particles including ultrafine oxides. Since these oxides dispersed in the steels are chemically stable even near the fusion line, the microstructure control is possible and the HAZ microstructure can be remarkably refined. Based on the new technology, YS 500MPa class thermomechanical control process (TMCP) steel plates with a low carbon equivalent and a 63.5mm thickness for offshore structures have been manufactured and tested. The steel plates have satisfied the required strength and low-temperature toughness of the base metal. They have also exhibited excellent CTOD properties and Charpy impact properties of joints welded by flux cored arc welding (FCAW) with 0.7kJ/mm and welded by submerged arc welding (SAW) with 3.5kJ/mm, as well as good weldability. The newly developed YS 460MPa and YS 500MPa class TMCP steel plates are being mass produced for offshore structures.",

author = "Akihiko Kojima and Akihito Kiyose and Yoshio Terada and Atsuhiko Yoshie and Ryuji Uemori and Shuji Aihara and Shiroh Imai and Yuzuru Yoshida and Toshihiko Adachi and Kazuaki Tanaka and Takao Nakashima",

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language = "English",

pages = "167--175",

note = "20th International Conference on Offshore Mechanics and Arctic Engineering; Materials ; Conference date: 03-06-2001 Through 08-06-2001",

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TY - CONF

T1 - Development of YS 500MPa class TMCP steel plates for offshore structures

AU - Kojima, Akihiko

AU - Kiyose, Akihito

AU - Terada, Yoshio

AU - Yoshie, Atsuhiko

AU - Uemori, Ryuji

AU - Aihara, Shuji

AU - Imai, Shiroh

AU - Yoshida, Yuzuru

AU - Adachi, Toshihiko

AU - Tanaka, Kazuaki

AU - Nakashima, Takao

PY - 2001

Y1 - 2001

N2 - New steel manufacturing technology has been developed to attain excellent crack tip opening displacement (CTOD) properties in a heat affected zone (HAZ) as well as yield strength (YS) of 500MPa in base metal. In the new steels, the HAZ microstructure near a weld fusion line is markedly refined by utilizing not only the formation of intragranular ferrite (IGF) but the strong retardation of austenite (here in after " γ ") grain growth. The IGF grows radially from oxides in the same way as in titanium-oxide bearing steels (TiO steels). The γ grain growth retardation is due to the pinning effect by fine particles including ultrafine oxides. Since these oxides dispersed in the steels are chemically stable even near the fusion line, the microstructure control is possible and the HAZ microstructure can be remarkably refined. Based on the new technology, YS 500MPa class thermomechanical control process (TMCP) steel plates with a low carbon equivalent and a 63.5mm thickness for offshore structures have been manufactured and tested. The steel plates have satisfied the required strength and low-temperature toughness of the base metal. They have also exhibited excellent CTOD properties and Charpy impact properties of joints welded by flux cored arc welding (FCAW) with 0.7kJ/mm and welded by submerged arc welding (SAW) with 3.5kJ/mm, as well as good weldability. The newly developed YS 460MPa and YS 500MPa class TMCP steel plates are being mass produced for offshore structures.

AB - New steel manufacturing technology has been developed to attain excellent crack tip opening displacement (CTOD) properties in a heat affected zone (HAZ) as well as yield strength (YS) of 500MPa in base metal. In the new steels, the HAZ microstructure near a weld fusion line is markedly refined by utilizing not only the formation of intragranular ferrite (IGF) but the strong retardation of austenite (here in after " γ ") grain growth. The IGF grows radially from oxides in the same way as in titanium-oxide bearing steels (TiO steels). The γ grain growth retardation is due to the pinning effect by fine particles including ultrafine oxides. Since these oxides dispersed in the steels are chemically stable even near the fusion line, the microstructure control is possible and the HAZ microstructure can be remarkably refined. Based on the new technology, YS 500MPa class thermomechanical control process (TMCP) steel plates with a low carbon equivalent and a 63.5mm thickness for offshore structures have been manufactured and tested. The steel plates have satisfied the required strength and low-temperature toughness of the base metal. They have also exhibited excellent CTOD properties and Charpy impact properties of joints welded by flux cored arc welding (FCAW) with 0.7kJ/mm and welded by submerged arc welding (SAW) with 3.5kJ/mm, as well as good weldability. The newly developed YS 460MPa and YS 500MPa class TMCP steel plates are being mass produced for offshore structures.

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M3 - Paper

AN - SCOPUS:0344741328

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EP - 175

T2 - 20th International Conference on Offshore Mechanics and Arctic Engineering; Materials

Y2 - 3 June 2001 through 8 June 2001

ER -

Development of YS 500MPa class TMCP steel plates for offshore structures

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