Experimental Research on Mechanical Properties and Tightening Methods of Stainless Steel High-Strength Bolts

ZHANG Tianxiong; WANG Yuanqing; CHEN Zhihua; BU Yidu; HE Wei; HENG Yuekun

doi:10.13204/j.gyjzG22050303

Volume 52 Issue 7

Oct. 2022

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ZHANG Tianxiong, WANG Yuanqing, CHEN Zhihua, BU Yidu, HE Wei, HENG Yuekun. Experimental Research on Mechanical Properties and Tightening Methods of Stainless Steel High-Strength Bolts[J]. INDUSTRIAL CONSTRUCTION, 2022, 52(7): 98-105,97. doi: 10.13204/j.gyjzG22050303

Citation:

ZHANG Tianxiong, WANG Yuanqing, CHEN Zhihua, BU Yidu, HE Wei, HENG Yuekun. Experimental Research on Mechanical Properties and Tightening Methods of Stainless Steel High-Strength Bolts[J]. INDUSTRIAL CONSTRUCTION, 2022, 52(7): 98-105,97. doi: 10.13204/j.gyjzG22050303

Citation:

ZHANG Tianxiong, WANG Yuanqing, CHEN Zhihua, BU Yidu, HE Wei, HENG Yuekun. Experimental Research on Mechanical Properties and Tightening Methods of Stainless Steel High-Strength Bolts[J]. INDUSTRIAL CONSTRUCTION, 2022, 52(7): 98-105,97. doi: 10.13204/j.gyjzG22050303

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Experimental Research on Mechanical Properties and Tightening Methods of Stainless Steel High-Strength Bolts

doi: 10.13204/j.gyjzG22050303

1. School of Civil Engineering, Tianjin University, Tianjin 300072, China;
2. Key Laboratory of Civil Engineering Safety and Durability of Ministry of Education, Tsinghua University, Beijing 100084, China;
3. Department of Civil Engineering, Beijing University of Technology, Beijing 100124, China;
4. Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

Received Date: 2022-05-03
Available Online: 2022-10-28

Abstract

Abstract

There are few researches on stainless steel high strength bolts worldwide, and there is a lack of uniform standards for bolt product specifications. In order to study the mechanical properties and tightening methods of stainless steel high strength bolts, physical tensile tests, hardness tests and tightening tests were carried out on two kinds of 10.9 grade stainless steel high-strength bolts. The tensile strength and hardness were obtained. The preload and tightening process were determined. The results showed that the two kinds of stainless steel high-strength bolts met the requirements of mechanical properties of grade 10.9 high-strength bolts. The thread galling of stainless steel bolts occurred during the tightening process. The lubricant Molykote D-321R had the best friction reduction effect on the galling and could reduce the torque coefficient of stainless steel high-strength bolts to the limit of torque coefficients of the high-strength bolts for steel structures. For the two methods of applying bolt preload, the torque method and the rotation angle method, the bolt preload obtained by the torque method was more consistent. The requirements for the construction preload of stainless steel high-strength bolts were proposed, and the construction torque was given to provide a reference for engineering application.
- stainless steel,
- high-strength bolt,
- mechanical properties,
- galling,
- torque coefficient,
- rotation angle method

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References(34)

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