Otel beton (fier beton) – un material folosit pe scara larga în construcții, fiind utilizat la armarea betonului, la elemente și structuri din beton armat și beton precomprimat. Este produs prin laminare la cald și poate avea profil neted – OB37 sau profil periodic (striat) -PC52.  Greutatea specifica a otelului: 7850kg/mc = 7.85tone/mc

Greutatea specifica la otel beton (fier beton) in functie de diametru:

Ø 3,0 mm = 0,057 kg/ml ; Ø 4,0 mm = 0,100 kg/ml ; Ø 5,6 mm = 0,193 kg/ml ; Ø 6,0 mm = 0,222 kg/ml ; Ø 7,0 mm = 0,302 kg/ml ; Ø 7,1 mm = 0,310 kg/ml ; Ø 8,0 mm = 0,395 kg/ml ; Ø 9,0 mm = 0,499 kg/ml ; Ø 10,0 mm = 0,617 kg/ml ; Ø 12,0 mm = 0,888 kg/ml ; Ø 14,0 mm = 1,210 kg/ml ; Ø 16,0 mm = 1,580kg/ml ; Ø 18,0 mm = 1,990 kg/ml ; Ø 20,0 mm = 2,470 kg/ml ; Ø 22,0 mm = 2,980 kg/ml ; Ø 25,0 mm =3,850 kg/ml ; Ø 28,0 mm = 4,840 kg/ml ; Ø 32,0 mm = 6,310 kg/ml ; Ø 36,0 mm = 7,990 kg/ml ; Ø 40,0mm = 9,870 kg/ml.

Aria laterala specifica la otel beton (fier beton)  in functie de diametru:

Ø 3,0 mm = 0,01884 mp/ml ; Ø 4,0 mm = 0,02512 mp/ml ; Ø 5,6 mm = 0,03517 mp/ml ; Ø 6,0 mm =0,03768 mp/ml ; Ø 7,0 mm = 0,04396 mp/ml ; Ø 7,1 mm = 0,04459 mp/ml ; Ø 8,0 mm = 0,05024 mp/ml ; Ø 9,0 mm = 0,05652 mp/ml ; Ø 10,0 mm = 0,06280 mp/ml ; Ø 12,0 mm = 0,07536 mp/ml ; Ø 14,0 mm =0,08792 mp/ml ; Ø 16,0 mm = 0,10048 mp/ml ; Ø 18,0 mm = 0,11304 mp/ml ; Ø 20,0 mm = 0,12560mp/ml ; Ø 22,0 mm = 0,13816 mp/ml ; Ø 25,0 mm = 0,15700 mp/ml ; Ø 28,0 mm = 0,17584 mp/ml ; Ø32,0 mm = 0,20096 mp/ml ; Ø 36,0 mm = 0,22608 mp/ml ; Ø 40,0 mm = 0,25120 mp/ml .