PS, just noticed your previous post. You can of course get the 152 x 152 in 44kg and 51 kg, but they are non-standard made by Tata and may not be easily available.
The 51kg beam is 170 deep, which would just about fit your floor depth, but the stiffness would be less than the 254 x 146 specified. The SE would be able to tell you if it would be OK for deflection, as he will know the loads on the beam.
The 51kg beam is 170 deep, which would just about fit your floor depth, but the stiffness would be less than the 254 x 146 specified. The SE would be able to tell you if it would be OK for deflection, as he will know the loads on the beam.