Cold Stretching of Cryogenic Pressure Vessels From Austenitic Stainless Steels

2011 ◽  
Author(s):  
Jinyang Zheng ◽  
Abin Guo ◽  
Cunjian Miao ◽  
Ping Xu ◽  
Jian Yang ◽  
...  
Keyword(s):  
Stainless Steels ◽  
Austenitic Stainless Steels ◽  
Pressure Vessels ◽  
High Rate ◽  
Fatigue Properties ◽  
Numerical Studies ◽  
Deformation Hardening ◽  
Considerable Work ◽  
Cryogenic Pressure Vessels ◽  
Strength Improvement

Austenitic stainless steel (ASS) exhibits considerable work-hardening upon deformation while retaining the characteristics of the material. The high rate of austenite deformation hardening was utilized by cold stretching (CS) of cryogenic pressure vessels. A few percent deformation will give the vessel a considerable and homogeneous yield strength improvement, and the wall thickness may be greatly reduced. The authors have conducted extensive experimental and numerical studies on CS of cryogenic pressure vessels from ASS. A summary of our work as well as a brief introduction of the history, standards, safety, and advantages of CS are given in this paper. What should be further investigated, such as fatigue properties of cold stretched ASS especially under cryogenic temperature, design of cold stretched transportable cryogenic vessels based on life, are also presented.

Producing HP Pump Barrels Utilizing Powder Metallurgy and Hot Isostatic Pressing

2009 ◽  
Author(s):  
Martin Bjurstro¨m ◽  
Carl-Gustaf Hjorth
Keyword(s):  
High Pressure ◽  
Stainless Steel ◽  
Stainless Steels ◽  
Hot Isostatic Pressing ◽  
Austenitic Stainless Steels ◽  
Pressure Vessels ◽  
Uniform Structure ◽  
Isostatic Pressing ◽  
Near Net Shape ◽  
Hip Process

The fabrication of near net shape powder metal (PM) components by hot isostatic pressing (HIP) has been an important manufacturing technology for steel and stainless steel alloys since about 1985. The manufacturing process involves inert gas atomization of powder, 3D CAD capsule design, sheet metal capsule fabrication and densification by HIP in very large pressure vessels. Since 1985, several thousand tonnes of parts have been produced. The major applications are found in the oil and gas industry especially in offshore applications, the industrial power generation industry, and traditional engineering industries. Typically, the components replace castings, forgings and fabricated parts and are produced in high alloy grades such as martensitic steels, austenitic stainless steels, duplex (ferritic/austenitic) stainless steels and nickel based superalloys. The application of PM/HIP near net shapes to pump barrels for medium to high pressure use has a number of advantages compared to the traditional forging and welding approach. First, the need for machining of the components is reduced to a minimum and welding during final assembly is reduced substantially. Mechanical properties of the PM/HIP parts are isotropic and equal to the best forged properties in the flow direction. This derives from the fine microstructure using powder powder and the uniform structure from the HIP process. Furthermore, when using the PM HIP process the parts are produced near net shape with supports, nozzles and flanges integrated. This significantly reduces manufacturing lead-time and gives greater design flexibility which improves cost for the final component. The PM HIP near net shape route has received approval from ASTM, NACE and API for specific steel, stainless steel and nickel base alloys. This paper reviews the manufacturing sequence for PM near net shapes and discusses the details of several successful applications. The application of the PM/HIP process to high pressure pump barrels is highlighted.

scholarly journals Effect of Microstructure on Creep Fatigue Properties for Type 316 Austenitic Stainless Steels

1996 ◽  
Vol 82 (6) ◽  
pp. 538-543 ◽  
Author(s):  
Nobuhiro FUJITA ◽  
Takanori NAKAZAWA ◽  
Hazime KOMATSU ◽  
Hitoshi KAGUCHI ◽  
Hideaki KANEKO ◽  
...  
Keyword(s):  
Stainless Steels ◽  
Austenitic Stainless Steels ◽  
Fatigue Properties ◽  
Creep Fatigue ◽  
Effect Of Microstructure

Producing HP Pump Barrels Utilizing Powder Metallurgy and Hot Isostatic Pressing

2009 ◽  
Author(s):  
Martin Bjurstro¨m ◽  
Carl-Gustaf Hjorth
Keyword(s):  
High Pressure ◽  
Stainless Steel ◽  
Stainless Steels ◽  
Hot Isostatic Pressing ◽  
Austenitic Stainless Steels ◽  
Pressure Vessels ◽  
Uniform Structure ◽  
Isostatic Pressing ◽  
Near Net Shape ◽  
Hip Process

The fabrication of near net shape powder metal (PM) components by hot isostatic pressing (HIP) has been an important manufacturing technology for steel and stainless steel alloys since about 1985. The manufacturing process involves inert gas atomization of powder, 3D CAD capsule design, sheet metal capsule fabrication and densification by HIP in very large pressure vessels. Since 1985, several thousand tonnes of parts have been produced. The major applications are found in the oil and gas industry especially in offshore applications, the industrial power generation industry, and traditional engineering industries. Typically, the components replace castings, forgings and fabricated parts and are produced in high alloy grades such as martensitic steels, austenitic stainless steels, duplex (ferritic/austenitic) stainless steels and nickel based superalloys. The application of PM/HIP near net shapes to pump barrels for medium to high pressure use has a number of advantages compared to the traditional forging and welding approach. First, the need for machining of the components is reduced to a minimum and welding during final assembly is reduced substantially. Mechanical properties of the PM/HIP parts are isotropic and equal to the best forged properties in the flow direction. This derives from the fine microstructure using powder powder and the uniform structure from the HIP process. Furthermore, when using the PM HIP process the parts are produced near net shape with supports, nozzles and flanges integrated. This significantly reduces manufacturing lead-time and gives greater design flexibility which improves cost for the final component. The PM HIP near net shape route has received approval from ASTM, NACE and API for specific steel, stainless steel and nickel base alloys. This paper reviews the manufacturing sequence for PM near net shapes and discusses the details of several successful applications. The application of the PM/HIP process to high pressure pump barrels is highlighted.

scholarly journals Tensile and Fatigue Properties of Austenitic Stainless Steels at LNG Temperature

1979 ◽  
Vol 65 (12) ◽  
pp. 1756-1765 ◽  
Author(s):  
Koji MUKAI ◽  
Kazuo HOSHINO ◽  
Tokio FUJIOKA
Keyword(s):  
Stainless Steels ◽  
Austenitic Stainless Steels ◽  
Fatigue Properties

Safety Factor of Austenitic Stainless Steel Pressure Vessels With Strain-Strengthening

2008 ◽  
Author(s):  
Gang Chen ◽  
Yang-Chun Deng ◽  
Xiao-Feng Yang
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Yield Strength ◽  
Safety Factor ◽  
Stainless Steels ◽  
Cryogenic Temperature ◽  
Austenitic Stainless Steels ◽  
Pressure Vessels ◽  
Different Levels ◽  
Strain Strengthening

The yield strength of austenitic stainless steels can be increased significantly through the strain-strengthening process. In this study, we presented the basic principle of strain-strengthening and introduced two strain-strengthening processes of austenitic stainless steels, Avesta process at normal temperature and Ardeform process at cryogenic temperature, in which Avesta process was much easier to operate. The design safety factor of pressure vessels with different levels of strain strengthening by Avesta process was also investigated. It was recommended that the strain during Avesta strain-strengthening process should be limited within 5%.

scholarly journals 310 Fatigue Properties of Pre-strained Austenitic Stainless Steels

2006 ◽  
Vol 2006 (0) ◽  
pp. 137-138
Author(s):  
Nobusuke HATTORI ◽  
Shin-ichi NISHIDA ◽  
Ikuto YOSHIOKA ◽  
Masayuki KOGA
Keyword(s):  
Stainless Steels ◽  
Austenitic Stainless Steels ◽  
Fatigue Properties

Research and Application on Mechanical Behavior of Austenitic Stainless Steels for Cold Stretched Pressure Vessel

2011 ◽  
Author(s):  
Yu Han ◽  
Xuedong Chen ◽  
Quankun Liu
Keyword(s):  
Yield Strength ◽  
Strain Rate ◽  
Stainless Steels ◽  
Pressure Vessel ◽  
Volume Fraction ◽  
Austenitic Stainless Steels ◽  
Small Strain ◽  
Pressure Vessels ◽  
Minor Effect ◽  
Static Conditions

Austenitic stainless steels (ASS) have good ductility and toughness but low yield strength. In order to save material and realize lightweight of pressure vessels, the cold stretching technology can be used to enhance ASS’s yield strength. Based on the control of different strain, the material parameters of strength, ductility and volume fraction of strain-induced martensite (SIM) were obtained. The results show that cold stretching can significantly improve ASS’s yield strength and have minor effect on material’s plasticity and content of SIM. The ASS still maintain enough plastic margin after cold stretching and thus can substantially reduce the wall thickness of vessel. In the quasi-static conditions, the mechanical parameters are not sensitive to strain rate. However, too small strain rate will lead to occurrence of serrated yielding, which is called Portevin-Le Chatelier (PLC) effect. The conclusions for the cold stretching in pressure vessel provide theoretic basis reference for engineering applications.

Evaluation of Hydrogen Environment Embrittlement and Fatigue Properties of Stainless Steels in High Pressure Gaseous Hydrogen: Investigation of Materials Properties in High Pressure Gaseous Hydrogen—2

2007 ◽  
Author(s):  
Tomohiko Omura ◽  
Mitsuo Miyahara ◽  
Hiroyuki Semba ◽  
Masaaki Igarashi ◽  
Hiroyuki Hirata
Keyword(s):  
High Pressure ◽  
Aluminum Alloy ◽  
Fatigue Life ◽  
Stainless Steels ◽  
Austenitic Stainless Steels ◽  
Hydrogen Gas ◽  
Gaseous Hydrogen ◽  
Fatigue Properties ◽  
Chemical Compositions ◽  
Hydrogen Environment

Hydrogen environment embrittlement (HEE) susceptibility in high pressure gaseous hydrogen was investigated on 300 series austenitic stainless steels and A6061-T6 aluminum alloy. Tensile properties of these materials were evaluated by Slow Strain Rate Testing (SSRT) in gaseous hydrogen pressurized up to 90MPa (13053 psig) in the temperature range from −40 to 85 degrees C (−40 to 185 degrees F). HEE susceptibilities of austenitic stainless steels strongly depended upon the chemical compositions and testing temperatures. A6061-T6 aluminum alloy showed no degradation by hydrogen. Fatigue properties in high pressure gaseous hydrogen were evaluated by the external cyclic pressurization test using tubular specimens. The tubular specimen was filled with high pressure hydrogen gas, and the outside of the specimen was cyclically pressurized with water. Type 304 showed a decrease in the fatigue life in hydrogen gas, while as for type 316L and A6061-T6 the difference of the fatigue life between hydrogen and argon environments was small. HEE susceptibility of investigated materials was discussed based on the stability of an austenitic structure.

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