... strip, a sintered porous tin bronze bush 1)SF-2 triple-layer composite material has a copper-plated steelbase ... oil indentations, whichare filled with lubricating grease before assembly. 2)Being a kind of boundary lubricating bearing, these products ... they are widely applied in civil equipments, steel strip coldrolling machines, coal mining equipment, automobilesteering joints, and bushes for steel ...