This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Trend of Bolts for Use in Automobiles and Development of Class 10.9 Low Carbon Boron Steel Bolt
Annotation ability available
Sector:
Language:
English
Abstract
There are strong demands for reduced production costs of ordinary bolts, of which a large number are used throughout automobiles. In addition, there are continued demands for higher performance and lower weight in automobiles. For this reason, there is an increasing trend to develop steel for high strength bolts or to adopt the plastic region tightening method. At present, the principal materials used in high strength bolts of class 10.9 are medium carbon alloy steel. When a low carbon boron steel bolt is used as a class 10.9 bolt under high stress, delayed fracture may occur, so that these cannot always be used for the body and chassis applications. The authors have developed a new low carbon boron steel with increased delayed fracture strength on the same order as that of JIS-SCM435 (equivalent to SAE4135) medium carbon alloy steel. Attention was focused principally on decreasing the amounts of phosphorus and sulfur in the steel. By using this new material, the developed class 10.9 bolts can be applied to body and chassis applications with lower cost and maintaining the same level of performance in comparison with the conventional SCM435.
Recommended Content
| Technical Paper | Delayed Fracture of Class 12.8 Bolts in Automotive Rear Suspensions |
| Aerospace Material Specification | Bolts and Screws, Steel, Corrosion Resistant |
| Ground Vehicle Standard | Mechanical and Material Requirements for Externally Threaded Fasteners |
Authors
Citation
Murakami, A., Hagiwara, Y., and Ishida, M., "Trend of Bolts for Use in Automobiles and Development of Class 10.9 Low Carbon Boron Steel Bolt," SAE Technical Paper 970516, 1997, https://doi.org/10.4271/970516.Also In
References
- Hagiwara Y. “TOKUSYUKOU(The Special Steel)” 44 12 1995 7
- Hagiwara Y. et al. SAE paper 911300 1991
- Fukui S. “TETU TO HAGANE(Iron and Steel)” 55 1969 151
- Nakazato F. Terasawa F. “TETU TO HAGANE(Iron and Steel)” 61 1975 841
- Banerji S.K. McMahon, C.J. Jr. Feng H.C. Met. Trans. 9A 1978 237
- Bandyopadhyay N. Kameda J. McMahon, C.J. Jr Met.Trans. 14A 1983 881
- Hasegawa T. et.al. Wire Jour.Int. 25 1992 49
- Matsuyama S. “TETSU TO HAGANE(Iron and Steel)” 180 9 1994 679
- Ueno M. et.al. “TETSU TO HAGANE(Iron and Steel)” 74 5 1988 158
- Uehara N. et.al “DENKI-SEIKOU(Electric Furnace Steel)” 53 1 1982 10
- Isokawa K. Namiki K. “DENKI-SEIKOU(Electric Furnace Steel)” 55 1984 101
- Tumura T. Nakasato F. et al. FASTENERS November 1986 49
- Kimura T. Nakamura S. “DENKI-SEIKOU(Electric Furnace Steel)” 65 1 1994 31
- Forging Sub-Committee Material Working Group “SOSEI TO KAKOU(Journal of Japan Society of Technology of Plasticity)” 22 241 1981 139
- Osakada K. Kawasaki T. Mori K. Ann.CIRP 30 1 1981 135