This specification covers a grade of special quality round and ovate steel wire intended for the manufacture of valve springs requiring resistance to set when used at moderately elevated temperatures and higher stress levels. This wire shall be in the oil tempered condition as specified by the purchased. GMN11189 has higher tensile strength requirements than GM2901M.

Materials Description. This steel shall be made by the electric fumace, open hearth, or basic oxygen process. This steel shall be strand cast. The subsequent refining processes must include the use of secondary ladle refining and the use of silicon for deoxidation purposes. The resulting inclusions thus shall predominantly be of a deformable nature. This material is considered super clean steel.

Typical Application. Engine valve springs.