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

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

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.

scholarly journals Development of Welding Wire for 690MPa High Tensile Strength Steel Plate.

DENKI-SEIKO ◽  
1996 ◽  
Vol 67 (3) ◽  
pp. 179-185
Author(s):  
Masaru Takenouchi ◽  
Ikuo Nagami ◽  
Takao Shimizu ◽  
Atsushi Kondo ◽  
Yoshiichi Tokuwa
Keyword(s):  
Tensile Strength ◽  
Steel Plate ◽  
High Tensile Strength ◽  
Welding Wire

Effect of Undermatched Weld on Deformation and Brittle Fracture Behaviors in High-Tensile Strength Steel Plate Welded Joint

2012 ◽  
Author(s):  
Masahito Mochizuki ◽  
Tomoya Kawabata
Keyword(s):  
Tensile Strength ◽  
Phase Transformation ◽  
Brittle Fracture ◽  
Steel Plate ◽  
Welded Joint ◽  
Base Plate ◽  
High Tensile Strength ◽  
Lower Strength ◽  
Fracture Behaviors ◽  
Plant Components

High tensile strength steel such as 950 MPa class is used in hydropower plant components due to its lower cost and higher reliability. This steel is already used for penstocks in the Kanna-gawa and Omaru-gawa hydropower plants in Japan. Proper welding is one of the most critical factors to ensure integrity of the plant components against brittle fracture from weld defects. For example, preheat- and interpass-temperature controls are essential to avoid weld defects and to ensure strength, since the weld process induces residual stress and possible weld deformations such as angular distortion or unevenness. Undermatching (lower strength in weld metal than in the base plate) makes high strength steel plate become easier to use for welding because restrictions in the welding process can be reduced by using softer welding consumables. Tensile strength in welded joints increases near the base plate when the undermatched zone is not much wider than the thickness. When the appropriate welding conditions for assuring strength and preventing brittle fracture are clarified, it becomes clear to be possible to use undermatched joints for penstock. In this paper, numerical simulation of stress-strain behavior during the weld process is performed by considering the microstructural effect due to phase transformation. Phase transformation data is obtained from measured dilatometric curves in continuous cooling transformation (CCT) diagrams. Phase transformation data involves many parameters, including not only the maximum temperature, cooling rate and heat input, but also the superposition of multi heat cycles. Then, the characteristics of deformation and strength in a welded joint of 950 MPa class steel plate for penstock with undermatched region, which is equivalent to using weld material with lower strength level, are discussed to expand the allowable welding conditions in penstock fabrication. Finally, brittle fracture behaviors are discussed by using standard crack-tip opening displacement (CTOD) tests and wide plate tests with through-thickness notch by the welded joint.

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