Paper Title:
Experimental Study on Mechanical Properties of Preloaded Diskspring Steel in Medium Temperature Range
  Abstract

Flange connections in petrochemical equipments easily leak high temperature gas or fluid. Configuration of flange with preloaded diskspring technique are introduced to solve this problem. However, the preloaded diskspring as an important role in flange is easily corroded at high temperature. Temperature fluctuation and strong corrosive circumstances would lower strength of diskspring and causes stress relaxation. Therefore, it is important to search suitable material for diskspring without reduction of strength and stress relaxation used in medium temperature range and strong corrosive circumstances. In this paper, precipitation hardening stainless steel 0Cr17Ni7Al (17-7PH) was studied systematically. Medium temperature mechanical properties are tested experimentally by electric stretch mechanical experiment setup with heater. The medium temperature elastic modulus variations are measured. The variation of elastic hysteresis curve loop area with reciprocating load-unload is measured at different temperature. Experimental results show that the elastic modulus of this material decreases only 0.1% from room temperature to 350°C. The elastic modulus remain almost unchanged at temperature below 300°C which ensure that the loading stability of diskspring does not change when temperature is changed under 300°C. It was found that the elastic hysteretic loop area can be minimized by five times loading-unloading at 300°C which ensure to decrease diskspring’s stress relaxation during long time use within medium temperature range, and it is a key basis for this type of diskspring making. Conclusion: 17-7PH is an ideal elastic material for diskspring used in medium temperature range and highly corrosion environment, and diskspring should be prestressing treated five times at 300°Cduring manufacture to decrease stress relaxation.

  Info
Periodical
Advanced Materials Research (Volumes 129-131)
Edited by
Xie Yi and Li Mi
Pages
547-551
DOI
10.4028/www.scientific.net/AMR.129-131.547
Citation
X. Y. Zhou, D. W. Zhang, X. Ma, "Experimental Study on Mechanical Properties of Preloaded Diskspring Steel in Medium Temperature Range", Advanced Materials Research, Vols. 129-131, pp. 547-551, 2010
Online since
August 2010
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Tatsuya Miyajima, Fukue Nagata, W. Kanematsu, Yoshiyuki Yokogawa, Mototsugu Sakai
927
Authors: Bo Zhou, Shi Cheng Zhao, Hui Qi, Li Min Zhou
Abstract:Shape memory polymer (SMP) is being used in many engineering fields due to its shape memory effect and the advantages of large recoverable...
465
Authors: Zhi Wang, Wen Wen Liu, Yun Hai Du
Chapter 1: Advanced Material Engineering and Nanotechnology
Abstract:The tensile elastic modulus, bend elastic modulus and tensile strength of the composite materials hose were determined by uniaxial tension...
3
Authors: Ewa Marcisz, Adam Niesłony, Tadeusz Łagoda
Chapter 1: Fatigue Life Prediction
Abstract:The paper presents the concept of division of the total strain amplitudes. Simulations were performed for high-alloy steel X6NiCr3220 for...
43