MECHANICAL CHARACTERISTICS OF 9% <font>Ni</font> STEEL WELDED JOINT FOR LNG STORAGE TANK AT CRYOGENIC

Yoon, Yong-Keun; Kim, J.H.; Shim, Kyu-Taek; Kim, Young-Kyun

doi:10.1142/s2010194512003431

Cited by 22 publications

(10 citation statements)

References 4 publications

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“…For various materials applications, the cryogenic temperature may range from 300 K to 4 K depending upon what type of material we are using. 84–107 Applications where specific strength is the primary need for material selection, nonferrous metals & their alloys and reinforced plastics are used but for applications that requires temperature less than 77 K, steel dominates.…”

Section: Methodsmentioning

confidence: 99%

“…For such applications precipitation hardened stainless steels are considered because of both martensite and austenitic phases in the matrix. 86–88…”

Section: Methodsmentioning

confidence: 99%

“…For such applications precipitation hardened stainless steels are considered because of both martensite and austenitic phases in the matrix. [86][87][88] Bearings used in cryogenic applications like pumping cryogens and cryogenic engines are highly different than bearing used in other applications. For such applications, rolling element bearings are used.…”

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Effect of cryogenic treatment on properties of materials: A review

Singh

Pandey

2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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The objective of this review paper is to introduce Cryogenic temperature effect on different properties of materials. Results showed that cryogenic operation improves properties like hardness, fatigue strength, tensile strength, toughness and resistance to wear in comparison to conventional operations. The improvement is a result of microstructural changes at cryogenic temperature which helps in conversion of austenite to martensite and carbide nucleation. The results also showed that doing tempering before or after cryogenic operation has significant influence on material properties which helps to achieve better carbide distribution. Different heat treatment sequences which involve tempering before or after Deep Cryogenic Treatment (DCT), provides varied results. Soaking time at cryogenic temperature also has an important role in refinement of microstructure and affect material properties.

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Section: Methodsmentioning

confidence: 99%

“…For such applications precipitation hardened stainless steels are considered because of both martensite and austenitic phases in the matrix. 86–88…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Effect of cryogenic treatment on properties of materials: A review

Singh

Pandey

2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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“…Saitho et al studied the mechanical properties of 9% nickel steel considering various welding consumables and processes [5]. Yoon et al estimated fatigue crack growth characteristics of a 9% nickel steel welded joint [6]. Khourshid et al investigated the influence of welding parameters on the brittle fracture of 9% nickel steel [7].…”

Section: Methodsmentioning

confidence: 99%

An Investigation of the Mechanical Properties of a Weldment of 7% Nickel Alloy Steels

Lee

Kim

2016

Metals

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During the last decade, the demand for natural gas has steadily increased for the prevention of environmental pollution. For this reason, many liquefied natural gas (LNG) carriers have been manufactured. Since one of the most important issues in the design of LNG carriers is to guarantee structural safety, the use of low-temperature materials is increasing. Among commonly employed low-temperature materials, nickel steel has many benefits such as good strength and outstanding corrosion resistance. Accordingly, nickel steels are one of the most commonly used low-temperature steels for LNG storage tanks. However, the study of fracture toughness with various welding consumables of 7% nickel alloy steel is insufficient for ensuring the structural safety of LNG storage tanks. Therefore, the aim of this study was to evaluate fracture toughness of several different weldments for 7% nickel alloy steels. The weldment of 7% nickel alloy steel was fabricated by tungsten inert gas (TIG), flux cored arc welding (FCAW), and gas metal arc welding (GMAW). In order to assess the material performance of the weldments at low temperature, fracture toughness such as crack tip opening displacement (CTOD) and the absorbed impact energy of weldments were compared with those of 9% nickel steel weldments.

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“…A brittle fracture occurs even under a typically acceptable low load and develops a crack instantaneously, often leading to catastrophic damage to the structure. Of the various destruction phenomena, this one is the most dangerous as it can cause destruction of structural machinery and equipment and even produce a large-scale accident [20,21]. In steel, the propagation speed of a brittle crack can be as fast as 2000 m per second.…”

Section: Analysis Of Brittle Fracture Of Heat-affected Zonementioning

confidence: 99%

A Study on the Development of an Optimization Algorithm and Determination Procedure for Toughness Deterioration Characteristics through Flux Core Arc Heat Input Control of ASTM A553-1 (9% Nickel Steel)

Park

Kim

Pyo

2022

Metals

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The International Maritime Organization has adopted the reduction of carbon dioxide emissions from ships as an important priority, and is continuously strengthening its regulations on marine air pollution. By 2035, it is expected that LNG-powered ships will account for more than 50% of the available ships. Accordingly, the demand for equipment related to LNG-fueled ships is expected to grow as well, requiring the development of a lot of equipment. However, the characteristics of LNG-powered ships mean that they require a high level of reliability and long history of operating reliably. Even when a product is developed, numerous demonstrations and quality assurance measures are needed to reach the technological level ship owners and customers require. Therefore, an optimization procedure to determine the welding quality for 9% Ni steel is necessary. In this study, the heat input criteria that induce brittle fracture characteristics were analyzed to optimize the flux core arc welding process for 9% Ni steel used in the manufacture of LNG storage tanks. We developed an optimization algorithm (Welding Current, Arc Voltage, Welding Speed) that can select a group of fracture conditions by examining the tendency of the tissue to brittle fracture due to excessive heat input among potential quality issues of cryogenic steel. Capable of selecting the range in which quality deterioration occurs, determining quality of a weld and avoiding the range in which toughness degradation occurs, through which a process to derive high quality 9% Ni welds is proposed.

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MECHANICAL CHARACTERISTICS OF 9% Ni STEEL WELDED JOINT FOR LNG STORAGE TANK AT CRYOGENIC

Cited by 22 publications

References 4 publications

Effect of cryogenic treatment on properties of materials: A review

Effect of cryogenic treatment on properties of materials: A review

An Investigation of the Mechanical Properties of a Weldment of 7% Nickel Alloy Steels

A Study on the Development of an Optimization Algorithm and Determination Procedure for Toughness Deterioration Characteristics through Flux Core Arc Heat Input Control of ASTM A553-1 (9% Nickel Steel)

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