st 55 steel

Chemical composition

C *<=0.20

Si <=0.55

Mn <=1.60

P <=0.040

S <=0.040

Cu 0.25 - 0.40

N <=0.009

* For thicknesses >= 30 mm C <= 0,22%

Mechanical properties

DIN EN 10025 (03/1994)

Hot rolled products of non-alloy structural steels.

Flat and long products

Yield stress (longitudinal)

>=355 N/mm² (<=16 mm)

>=345 N/mm² (16 - 40 mm)

>=335 N/mm² (40 - 63 mm)

>=325 N/mm² (63 - 80 mm)

>=315 N/mm² (80 - 100 mm)

>=295 N/mm² (100 - 150 mm)

>=285 N/mm² (150 - 200 mm)

>=275 N/mm² (200 - 250 mm)

Tensile strength ( longitudinal)

510 - 680 N/mm² (<=3 mm)

490 - 630 N/mm² (3 - 100 mm)

470 - 630 N/mm² (100 - 150 mm)

450 - 630 N/mm² (150 - 250 mm)