Indicates the materials of the rolling bearing bushing bodies, both raw and finished, for railway, tramway and subway rolling stock; it provides information on the manufacturing process and on the examinations and tests to be carried out for the acceptance of the bushing bodies. It does not concern bushing bodies made of non-ferrous materials. Designation. Tests: tensile, bending, resilience, Brinell hardness; micrographic, radiographic, visual examination; dimensional control; chemical analysis. Proceedings. Table of results. Material: steel FeG38VR UNI 3158-68 or FeG45VR UNI 3158-68 or malleable cast iron gmn37 UNI 3779-69 or with ferritic spheroidal graphite cast iron gsq 42/15 UNI 4544 or with pearlitic spheroidal graphite cast iron gs 55/2 UNI 4544. Origin : UNIFER 2.140.
UNI 7155-1972 history
1972UNI 7155-1972 Roller-bearing axle-box cases for railway, tramway and metropolitan vehicles. Qualities, requirements and tests.