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High Strength Steel for Cylinder Head Bolt
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English
Abstract
JIS SCM440M (SAE4140H), heat treated to the strength level of 120 to 140 kgf/mm2(171 to 199 ksi) -ISO 12.9 class-, is currently used for cylinder head bolts of Japanese passenger cars. Lower alloy steels, such as SAE 1541 for example, have not been substituted for JIS SCM440H so far because of their high susceptibility to delayed fracture. Daido Steel has tackled this problem and succeeded in applying the lower alloy SAE 1541 steel to 12.9 class cylinder head bolts by enhancing the resistance to delayed fracture by reducing impurities, especially sulphur. In this paper mechanical properties and delayed fracture characteristics of SAE 1541-ULS (Ultra Low Sulphur) steel are reported. 1541-ULS (S<0.005%, S+P< 0.020%) shows outstanding resistance to delayed fracture compared to conventional steel. Furthermore, the amount of MnS inclusions decreases remarkably in ULS steel, which results in high toughness. On the basis of these results, 1541-ULS steels have been used as cylinder head bolts of passenger cars.
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Citation
Namiki, K., Isokawa, K., Kojima, H., and Okoshi, N., "High Strength Steel for Cylinder Head Bolt," SAE Technical Paper 840573, 1984, https://doi.org/10.4271/840573.Also In
References
- Fukui S. Asada C. Trans. ISIJ 9 448
- Hughel: T. J. SAE Technical Paper, 820122 1982
- Banerji S. K. McMahon C. J. Jr. Feng H. C. Met. Trans. 9A 1978 237
- Brian C. L. Feng H. C. Banerji S. K. Met. Trans. 10A 1979 123
- Brian C. L. Feng H. C. McMahon C. J. Jr. Met. Trans. 9A 1978 625
- Uyehara: N. SAE Technical Paper, 839657 1983
- Bandyopadhyay N. McMahon C. J. Jr. Met. Trans. 14A 1983 1313
- Briant C. L. Banerji S. K. Met. Trans. Trans. 10A 1979 1729
- Bandyopadhyay N. Kameda Jun McMahon C. J. Jr. Met. Trans. 14A 1983
- Barth C. F. Steigerwald E. A. Met. Trans. 1 1970 3451