George S. Hamilton has been appointed assistant manager of Bethlehem Steel Corporation's Boston repair yard, according to William H. Collins, general manager of the facility.

Mr. Hamilton succeeds Mr. Collins who was named manager on February 1. The new assistant manager was previously general manager of Seatrain Line, Inc.'s marine operations and terminal facilities at Edgewater, N.J. He had earlier been associated with Bethlehem's former operation at Quincy, Mass.