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    Investigation on Influence Factors of Mechanical Properties of Austenitic Stainless Steels for Cold Stretched Pressure Vessels

    Source: Journal of Pressure Vessel Technology:;2012:;volume( 134 ):;issue: 006::page 61407
    Author:
    Jinyang Zheng
    ,
    Cunjian Miao
    ,
    Yaxian Li
    ,
    Ping Xu
    ,
    Li Ma
    ,
    Abin Guo
    DOI: 10.1115/1.4007039
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Cold stretched pressure vessels from austenitic stainless steels (ASS) have been widely used all over the world for storage and transportation of cryogenic liquefied gases. Cold stretching (CS) is performed by pressurizing the finished vessels to a specific pressure to produce the required stress which in turn gives an amount of plastic deformation to withstand the pressure load. Nickel equivalent (Nieq) and preloading, which is introduced in welding procedure qualification for cold stretched pressure vessels, are considered to be important factors to mechanical behavior of ASS. During the qualification, welded joint will be preloaded considering the effect of CS on pressure vessels. After unloading, the preloaded welded joint will go through tensile test according to standard requirements. There are two kinds of preloading method. One is to apply required tensile stress σk on specimen and maintain it for a long time (stress-controlled preloading). The other is to stretch specimen to a specific strain of 9% (strain-controlled preloading). Different preloading and preloading rates may lead to differences in mechanical behavior of preloaded welded joint. In order to understand the effects of nickel equivalent, preloading and preloading rate on the mechanical behavior of ASS for cold stretched pressure vessels, a series of tests were conducted on base metal, welded joint, and preloaded welded joint of ASS EN1.4301 (equivalent to S30408 and AISI 304). As regards to the preloaded welded joint, the ultimate tensile strength (UTS) decreased as the nickel equivalent increased, while the elongation to fracture increased. It was more difficult to meet the available mechanical requirements with strain-controlled preloading case than with stress-controlled preloading case. Rates of preloading had some effect on the mechanical properties of welded joint but nearly no effect on the mechanical properties of preloaded welded joint. These results are helpful for choosing appropriate material and determining a proper preloading method for welding procedure qualification.
    keyword(s): Pressure vessels , Stress , Base metals , Mechanical properties , Mechanical behavior , Stainless steel , Tensile strength , Deformation , Welded joints , Fracture (Process) , Welding AND Vessels ,
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      Investigation on Influence Factors of Mechanical Properties of Austenitic Stainless Steels for Cold Stretched Pressure Vessels

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    http://yetl.yabesh.ir/yetl1/handle/yetl/150057
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    contributor authorJinyang Zheng
    contributor authorCunjian Miao
    contributor authorYaxian Li
    contributor authorPing Xu
    contributor authorLi Ma
    contributor authorAbin Guo
    date accessioned2017-05-09T00:53:54Z
    date available2017-05-09T00:53:54Z
    date copyright41244
    date issued2012
    identifier issn0094-9930
    identifier otherJPVTAS-926532#pvt_134_6_061407.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/150057
    description abstractCold stretched pressure vessels from austenitic stainless steels (ASS) have been widely used all over the world for storage and transportation of cryogenic liquefied gases. Cold stretching (CS) is performed by pressurizing the finished vessels to a specific pressure to produce the required stress which in turn gives an amount of plastic deformation to withstand the pressure load. Nickel equivalent (Nieq) and preloading, which is introduced in welding procedure qualification for cold stretched pressure vessels, are considered to be important factors to mechanical behavior of ASS. During the qualification, welded joint will be preloaded considering the effect of CS on pressure vessels. After unloading, the preloaded welded joint will go through tensile test according to standard requirements. There are two kinds of preloading method. One is to apply required tensile stress σk on specimen and maintain it for a long time (stress-controlled preloading). The other is to stretch specimen to a specific strain of 9% (strain-controlled preloading). Different preloading and preloading rates may lead to differences in mechanical behavior of preloaded welded joint. In order to understand the effects of nickel equivalent, preloading and preloading rate on the mechanical behavior of ASS for cold stretched pressure vessels, a series of tests were conducted on base metal, welded joint, and preloaded welded joint of ASS EN1.4301 (equivalent to S30408 and AISI 304). As regards to the preloaded welded joint, the ultimate tensile strength (UTS) decreased as the nickel equivalent increased, while the elongation to fracture increased. It was more difficult to meet the available mechanical requirements with strain-controlled preloading case than with stress-controlled preloading case. Rates of preloading had some effect on the mechanical properties of welded joint but nearly no effect on the mechanical properties of preloaded welded joint. These results are helpful for choosing appropriate material and determining a proper preloading method for welding procedure qualification.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleInvestigation on Influence Factors of Mechanical Properties of Austenitic Stainless Steels for Cold Stretched Pressure Vessels
    typeJournal Paper
    journal volume134
    journal issue6
    journal titleJournal of Pressure Vessel Technology
    identifier doi10.1115/1.4007039
    journal fristpage61407
    identifier eissn1528-8978
    keywordsPressure vessels
    keywordsStress
    keywordsBase metals
    keywordsMechanical properties
    keywordsMechanical behavior
    keywordsStainless steel
    keywordsTensile strength
    keywordsDeformation
    keywordsWelded joints
    keywordsFracture (Process)
    keywordsWelding AND Vessels
    treeJournal of Pressure Vessel Technology:;2012:;volume( 134 ):;issue: 006
    contenttypeFulltext
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