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Research Papers: Operations, Applications and Components

Applicability of the ASME Exemption Curve for Chinese Pressure Vessel Steel Q345R

[+] Author and Article Information
Qingfeng Cui

Institute of Process Equipment,
School of Mechanical Engineering,
East China University of Science
and Technology,
130 Meilong Street,
Shanghai 200237, China
e-mail: cqf_mail@163.com

Hu Hui

Institute of Process Equipment,
School of Mechanical Engineering,
East China University of Science
and Technology,
130 Meilong Street,
Shanghai 200237, China
e-mail: huihu@ecust.edu.cn

PeiNing Li

Institute of Process Equipment,
School of Mechanical Engineering,
East China University of Science
and Technology,
130 Meilong Street,
Shanghai 200237, China
e-mail: lpn_mail@163.com

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received August 6, 2014; final manuscript received May 13, 2015; published online August 6, 2015. Assoc. Editor: Allen C. Smith.

J. Pressure Vessel Technol 137(6), 061602 (Aug 06, 2015) (7 pages) Paper No: PVT-14-1128; doi: 10.1115/1.4030673 History: Received August 06, 2014

Q345R steel is the most commonly used material in fabrication of the pressure vessels and boilers in China, due to its excellent properties. In 2010, ASME code case 2642 accepted Q345R steel for use in construction of pressure vessels. The code case specified impact test exemption curve A for the impact test requirements for Q345R. However, this provision severely limits the application of this material at low temperature, since most of the minimum design metal temperature (MDMT) of curve A is above the freezing point. In this paper, a series of tests (such as uniaxial tensile test, impact test, and fracture toughness test) were carried out at low temperature to investigate the mechanical properties of Q345R steel plates with thickness of 36–80 mm. This study of low temperature usage of Q345R steel was conducted using the fracture mechanics assessment procedure of API 579-1/ASME FFS-1. The fracture toughness is given by master curve (MC) method in the transition regime. The results show that Q345R can be used at lower temperature and that classifying Q345R steel into curve D is appropriate.

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References

Figures

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Fig. 1

Impact test exemption curves in ASME VIII-1 UCS66

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Fig. 2

Yield and ultimate strength of Q345R steel at different temperatures

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Fig. 3

Charpy impact energy of Q345R steel at different temperatures

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Fig. 4

Envelope of allowable Kmax during precracking

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Fig. 5

Dimensions of the 1T-SE(B) specimen and photograph of the experimental setup

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Fig. 7

Fracture toughness comparison

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Fig. 8

Assessment results of exemption curve D (AW)

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Fig. 9

Toughness ratio Kr changing with different R/t

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Fig. 10

Assessment results of plate and cylinder

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