PRODUCTION OF STEEL BOLT
PURPOSE:To improve delayed fracture resistance so as to improve fatigue strength in the case of producing a steel bolt as a high strength bolt, by decomposing phosphate film, which is formed on the surface of a steel bolt member in a lubricating film treatment process, at thermal treatment so as to...
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Main Authors | , , |
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Format | Patent |
Language | English |
Published |
16.08.1994
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Edition | 5 |
Subjects | |
Online Access | Get full text |
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Summary: | PURPOSE:To improve delayed fracture resistance so as to improve fatigue strength in the case of producing a steel bolt as a high strength bolt, by decomposing phosphate film, which is formed on the surface of a steel bolt member in a lubricating film treatment process, at thermal treatment so as to evade such a situation of infiltrating phosphor component into the inside of the steel bolt member. CONSTITUTION:In lubricating film process, phosphate film is formed on a surface of a steel bolt member, in a bolt forming process, a screw part is formed, in a micro shot process, shot particles are shot on a surface part of the steel bolt member where phosphate film is formed so as to reduce phosphate film, and it transfers to a thermal treatment process. |
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Bibliography: | Application Number: JP19930013159 |