S355G8+M is a structural grade steel supplied to the offshore industry. The material can be delivered as normalized (N) or thermo-mechanically rolled (M). Supplied in accordance with EN10225:2001, the steel offers good tensile and yield strength.
Chemical Composition (EN 10225 standard)
|
Element |
Max. % (Heat Analysis) |
|---|---|
|
C |
0.16 |
|
Si |
0.50 |
|
Mn |
1.60 |
|
P |
0.030 |
|
S |
0.030 |
|
N |
0.012 |
|
Cu |
0.35 |
|
Cr |
0.30 |
|
Mo |
0.08 |
|
Nb |
0.05 |
|
V |
0.10 |
|
Ti |
0.04 |
|
Al (min) |
0.020 |
S355G8+M Mechanical Properties
|
Grade |
S355G8+M Mechanical Properties (min) |
||||||||
|
Tensile Strength |
Yield Strength |
Elongation |
|||||||
|
Thickness (mm) |
Thickness t - mm |
||||||||
|
≤100 |
>100 |
≤16 |
16<t≤25 |
25<t≤40 |
40<t≤63 |
63<t≤100 |
100<t≤150 |
% |
|
|
S355G8+M |
470/630 |
460/620 |
355 |
355 |
345 |
335 |
325 |
320 |
22 |
S355G8+M Equivalent Grades Comparison Table
|
Standard |
Equivalent Grade |
Notes |
|---|---|---|
|
EN 10025-2 |
S355J2+N / S355K2+N |
Similar mechanical properties, but not for offshore use |
|
EN 10225 |
S355G8+M |
Specific for offshore structures |
|
ASTM / ASME |
A572 Grade 50 (approx.) |
Similar yield but not identical chemistry |
|
BS (UK) |
50D / 50DD |
Older British structural steel grades |
|
API (USA) |
API 2H Grade 50 |
Offshore steel with higher toughness |
|
ISO |
ISO 630-2 Grade S355N |
Close in composition and application |
|
JIS (Japan) |
SM490YA (approx.) |
Comparable yield strength |
|
China (GB/T) |
Q345D (approx.) |
Similar yield, lower toughness in cold |
