Reduction factors for stainless steel bolts at elevated temperatures

摘要

This paper presents an experimental investigation of the mechanical properties of sixty A4-70 and A4-80 stainless steel bolts under steady-state temperatures ranging from 20 to 900 degrees C. The material responses at elevated temperatures of the parent materials, SUS316 and SUS316Ti stainless steels (also known as EN 1.4401 and EN 1.4571 steels), and of fire-resistant bolts are included for comparisons. The tensile strength degradation of stainless steel bolts in fire are found to be reasonably close to those specified by Eurocode 3 Part 1.2 for their parent materials, but the Young's modulus degradation is not so robust. At temperatures lower than 650 degrees C, the stainless steel bolts retain their 0.2% proof strength better than their parent materials. Importantly, in the temperature range of 500 to 900 degrees C the stainless steel bolts retain their tensile strength, Young's modulus and 0.2% proof strength better than fire-resistant bolts (BOLTEN110h, Young's modulus and 0.2% proof strength are derived in this paper for stainless steel bolts at elevated temperatures. (C) 2018 Elsevier Ltd. All rights reserved.