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Experimental study on the minimum design metal temperature of Q345R steel

Q345R 钢最低设计金属温度的试验研究

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Abstract

As the material most widely used in manufacturing pressure vessels in China, Q345R steel has been permitted in ASME Code Case 2642 to be used for fabricating pressure vessels since 2010. It is listed in the material group corresponding to the exemption curve A for Charpy V-notched (CVN) impact test requirements. However, recent studies indicate that the mechanical property of Q345R has been underestimated and the curve A classification is over-conservative. In this paper, the K1d–T relationship for two batches of Q345R produced in 2009 and 2014 is empirically obtained by curve–fitting and regression analysis from a large amount of CVN data based on K1c–CVN correlations and the temperature-shift method. Based on the theory of derivation for the ASME exemption curves, the specific exemption curves for the two batches are generated by combining the K1d–T relationship and the K1(min)–t relationship developed from the failure assessment diagram (FAD). Such exemption curve is not in parallel to the ASME curves, and lies over curve C and between curves B and D, but better reflects the actual toughness and expands the impact test exemption area, especially for small components with a thickness less than 20 mm. Furthermore, the method presented in this paper (the Materials Properties Council (MPC) method) is compared with the master curve (MC) method, concluding that the two methods are reliable for determining the exemption curve, and the MC method expands a further area for the impact test exemption and results in a lower minimum design metal temperature (MDMT) than the MPC method.

中文概要

目的

Q345R 是中国应用最多、最广泛的压力容器钢板 材料,其低温韧性在国际上被严重低估。本文旨 在通过大量试验研究,探明Q345R 在低温下的实 际韧性表征,得到其特有的冲击试验豁免曲线, 并确定其合适的使用温度范围。

创新点

1. 基于大量低温试验数据,并考虑应变率的影响, 得到了Q345R 特有的冲击试验豁免曲线;2. 采用 主曲线方法代替纯冲击试验方法评价Q345R 低 温韧性,得到了基于主曲线方法的Q345R 豁免曲 线;3. 通过比较两类韧性评价方法所得的豁免曲 线,最终确定合适的Q345R 使用温度范围。

方法

1. 利用试验获得大量的冲击试验数据(图3),通 过计算K1(min)–t 关系(图5)和Kc–T 关系(图9), 并考虑应变率的影响(公式(18)),得到Q345R 特有的冲击试验豁免曲线(图10);2. 利用试验 方法获得Q345R 的主曲线(图4),并用其代替 原来的Kc–T 关系,得到基于主曲线方法的Q345R 豁免曲线(图14);3. 比较两类方法的K1d–T 关 系(图13)和豁免曲线(图14)。

结论

1. Q345R 的低温韧性在国际上被严重低估;2. 得 到了Q345R 特有的冲击试验豁免曲线及其合适 的使用温度范围;3. 主曲线方法的引入能进一步 拓展Q345R 的使用温度范围。

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Authors and Affiliations

  1. Institute of Process Equipment, Zhejiang University, Hangzhou, 310027, China

    Xiang-Yu Shu, Ying-Zhe Wu & Jin-Yang Zheng

  2. National Technology Research Center on Pressure Vessel and Pipeline Safety Engineering, Hefei, 215021, China

    Bi-Nan Shou

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  1. Xiang-Yu Shu
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  2. Ying-Zhe Wu
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Correspondence to Jin-Yang Zheng.

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Project supported by the National Key Research and Development Program of China (No.2016YFC0801905).

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Shu, XY., Wu, YZ., Zheng, JY. et al. Experimental study on the minimum design metal temperature of Q345R steel. J. Zhejiang Univ. Sci. A 19, 491–504 (2018). https://doi.org/10.1631/jzus.A1700188

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  • DOI: https://doi.org/10.1631/jzus.A1700188

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