scholarly journals Investigation on Enhancement of Property of Ductile Crack Initiation in 780MPa Class High Tensile Strength Steel Plate-Studies of Safety against Fracture on 780MPa Class High Tensile Strength Steel Plate after Prestrain (Report 4)-

2005 ◽  
Vol 23 (2) ◽  
pp. 319-328 ◽  
Author(s):  
Tomoya KAWABATA ◽  
Kazushige ARIMOCHI ◽  
Masao TOYODA
Keyword(s):  
Tensile Strength ◽  
Crack Initiation ◽  
Steel Plate ◽  
Ductile Crack ◽  
High Tensile Strength

Full penetration welding of thick high tensile strength steel plate with high-power disk laser in low vacuum

2018 ◽  
Vol 32 (5) ◽  
pp. 289-302
Author(s):  
Seiji Katayama ◽  
Ryouji Ido ◽  
Koji Nishimoto ◽  
Masami Mizutani ◽  
Yousuke Mizutani
Keyword(s):  
Tensile Strength ◽  
High Power ◽  
Steel Plate ◽  
High Tensile Strength ◽  
Disk Laser ◽  
Full Penetration

scholarly journals Evaluation of the Form-Forming Mechanism for High-Tensile-Strength Steel Plate

2017 ◽  
Vol 58 (12) ◽  
pp. 1708-1714 ◽  
Author(s):  
Kouji Kanno ◽  
Souichiro Nishino ◽  
Kunio Ohya
Keyword(s):  
Tensile Strength ◽  
Steel Plate ◽  
High Tensile Strength ◽  
Forming Mechanism

Safety of Mega Container Ship Focusing on Brittle Crack Initiation and Arrest Behavior of Heavy Thickness Plate

2008 ◽  
Author(s):  
Masanobu Toyoda ◽  
Noboru Kiji ◽  
Yoshiyuki Nakajima ◽  
Tetsuo Okada ◽  
Yasumasa Nakanishi ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Crack Initiation ◽  
Yield Strength ◽  
Base Metal ◽  
Steel Plate ◽  
Brittle Crack ◽  
Hull Structure ◽  
Structural Details ◽  
Weld Structure ◽  
Welding Joints

The enlargement of containership requires the higher tensile strength steel and thicker plate around the hatch coaming more than the prescribed classification rules. These call the concerns about the safety of brittle crack initiation and arrestability of hull structure. It is known that increasing of stress and thickness of plates will reduce the toughness of base metal and welding joints. Therefore, the authors conducted to assure the toughness of base metal and welding joint for new higher tensile strength steel of 460MPa yield strength (YP460) and 60mm thickness. It has been considered that weld assembled steel plate structure has some arrestability at intersections of plates, though there are no prescription on the rules. And it was reported that very thicker mother plate has not enough toughness to arrest brittle crack recently. The authors investigated the structural arrestability by model testing and FE analysis and established it. Furthermore, structural details for intersections were also established. Both preventing the brittle crack initiation and arresting the brittle crack of weld structure were described, focusing on developing higher yield strength and heavier thickness of YP460 for containership in this paper.

scholarly journals Improvement in Impact Properties of 80kg/mm2 Grade High Tensile Strength Steel Plate

1980 ◽  
Vol 66 (2) ◽  
pp. 253-262
Author(s):  
Seiichi WATANABE ◽  
Hiroo OHTANI ◽  
Kazuo SAKAI ◽  
Hiromi UCHIMURA
Keyword(s):  
Tensile Strength ◽  
Steel Plate ◽  
High Tensile Strength ◽  
Impact Properties

Effect of Edge Shape of Tool in Finish Blanking

2014 ◽  
Vol 939 ◽  
pp. 253-259
Author(s):  
Tomohiro Yamada ◽  
Zhi Gang Wang ◽  
Takuya Fukao
Keyword(s):  
Tensile Strength ◽  
Process Parameters ◽  
Steel Plate ◽  
Experimental Results ◽  
High Tensile Strength ◽  
Limited Effect ◽  
Edge Angle ◽  
Small Clearance ◽  
Tool Shape

In the present paper, the finish-blanking method is taken up because it is an easy-to-use method by using a tool with rounded edge and a small clearance between the punch and die. In finish blanking, the process parameters such as the tool shape and clearance are significant. The purpose of the present work is to clarify the effect of tool shape of PW punch in finish blanking. In the present paper, a high-tensile-strength-steel plate with a thickness of 6mm was used. The edge shape of punch was changed, and the clearance was changed within the range of 0.65%t - 12%t. The experimental results show that the edge angle of PW punch should be in the range of 30° - 60°, and the clearance should be less than 2.0%t to obtain the ratio of the burnished surface more than 80%. The edge shape of the punch has a very limited effect on the shear droop, when the clearance is less than 2.0%t. It was also found that the PW punch is more suitable to control the burr depth than Rounded punch.

Effect of Mn content on corrosion characteristics of lean Mn TWIP steel

2018 ◽  
Vol 32 (19) ◽  
pp. 1840083 ◽  
Author(s):  
K. M. Moon ◽  
D. A. Kim ◽  
Y. H. Kim ◽  
M. H. Lee
Keyword(s):  
Tensile Strength ◽  
Oxide Film ◽  
Electrochemical Method ◽  
Steel Plate ◽  
Twip Steel ◽  
Manganese Content ◽  
The Body ◽  
High Tensile Strength ◽  
Corrosion Properties ◽  
Mn Content

It is important that the steel plate is manufactured with a high tensile strength to reduce the weight of the body. It is generally accepted that twinning induced plasticity (TWIP) steel is a special steel with not only a high ductility but also a high-tensile strength compared to general steel. While numerous investigations have been carried out on the TWIP steel with an amount of manganese of at least 20%, the investigation of steel with manganese content of less than 20% has seldom been considered until now. In this study, the TWIP steel with manganese of less than 20% (12Mn, 15Mn and 18Mn TWIP steel) was investigated to determine the corrosion properties using electrochemical method. The 18Mn and 12Mn samples exhibited the best and worst corrosion resistance, respectively. It is suggested that the 18Mn sample forms a stable oxide film on the surface because it contains a larger amount of manganese and aluminum compared to the other samples, and their composition enables the easy formation of the oxide film.

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