Heavy rail of steel U75 V is rolled by 14 passes rough-rolling (BD1) - intermediate rolling (BD2) and 6 passes CCS finishing rolling ( UR
1
ER
UR2
UR
3
EF and UF) from 280 mm x 380 mm cast bloom. The structure in deformed sample of heavy rail of steel U75V at different pass was observed by using metallographic microscope. Results show that with increasing pass reduction ratio of heavy rail steel at BD1 E
BD2B
UR
]
and UF
the ratings of pearlite grain size at head
waist and bottom of heavy rail increase respectively from 6.0〜6. 5
6. 0 ~ 6. 5 and 6. 0 ~ 6. 5 to 8. 0 ~ 8. 5
7. 5 〜 8. 0 and 8. 0 ~ 8. 5
at that the spaces between lamellae of pearlite decrease respectively from 0. 51 |±m
0. 41 μm and 0. 49 to 0. 29 μm
0. 27 μm and 0. 25 μm
that are available to increase the mechanical properties of heavy rail.