S355G8+M/+N
S355G8 comes under the standard EN10225:2001 which the technical delivery condition for weldable steels for fixed offshore structures.
S355G8 can either be normalised (N) or thermo-mechnically rolled (M) and is a structural grade offering good tensile and yield strength. The steel is used throughout the offshore oil and gas industry in the construction of structures and platforms.
Please refer to the technical information below for S355G8+M and S355G8+N.
Chemical Composition of S355G8+M/+N
| % | |
|---|---|
| C | 0.14 |
| Si | 0.15/0.55 |
| Mn | 1.00/1.65 |
| P | 0.02 |
| S | 0.007 |
| Cr | 0.25 |
| Mo | 0.08 |
| Ni | 0.5 |
| Al | 0.015/0.055 |
| Cu | 0.3 |
| N | 0.01 |
| Nb | 0.04 |
| Ti | 0.025 |
| V | 0.06 |
| Nb+V | 0.06 |
Mechanical Properties of S355G8+M/+N
| Grade | Mechanical Properties (min) unless sated | Tensile Strength Rm MPa | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Tensile Strength | Nominal Thickness (mm) | ||||||||
| Thickness (mm) | Elongation A | ||||||||
| < 100 | >100 | <16 | >16 <25 | >25 <40 | >40 <63 | >63 <100 | >100 <150 | % | |
| S355G8+M | 470/630 | - | 355 | 355 | 345 | 335 | 325 | - | 22 |
| S355G8+N | 470/630 | 460/620 | 355 | 355 | 345 | 335 | 325 | 320 | 22 |