Offshore steel grade S420G1 is supplied under the specification EN10225:2001. The steel which is available in either quenched (Q) or thermo-mechanically rolled (M) condition, is used in the construction of fixed offshore structures including oil rigs and service platforms.
EN 10225 S420G1+M oil and offshore platform steel plate is mainly used in steel structures. This steel standard specification S420 includes four different steel grades S420G1+QT, S420G1+M, S420G2+QT and S420G2+M. They have owned different chemical composition and mechanical property. Oil and offshore platform steel plate S420G1+M owned the minimum yield strength at 420Mpa, and the tensile strength shall be above 500 Mpa. TMCP heat treatment is necessary for steel plate S420G1+M for any thickness when rolling.
Chemical composition for S420G1+M Platform steel (Ladle Analysis Max%)
|
Main chemical elements composition of S420G1+M |
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|
C |
Si |
Mn |
P |
S |
Cr |
Mo |
Nb+V |
Nb+V+Ti |
|
0.14 |
0.15-0.55 |
1.65 |
0.020 |
0.010 |
0.25 |
0.25 |
0.09 |
0.11 |
|
Ni |
Alt |
Cu |
N |
Nb |
Ti |
V |
Cr+Mo+Ni+Cu |
|
|
0.70 |
0.015-0.055 |
0.30 |
0.010 |
0.040 |
0.025 |
0.080 |
0.90 |
|
Mechanical Properties for S420G1+M oil and offshore steel
|
Grade |
Mechanical Properties (min) unless stated |
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|
Tensile Strength |
Yield Strength |
Elongation |
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|
Thickness t - (mm) |
Thickness t - mm |
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|
≤40 |
40<t≤100 |
≤16 |
16<t≤40 |
40<t≤63 |
63<t≤80 |
80<t≤100 |
% |
|
|
S420G1+M |
500/660 |
480/640 |
420 |
400 |
390 |
380 |
380 |
19 |
We can supply EN10225:S355G5+M, S355G6+M, S355G7+M, S355G8+M, S355G9+M, S355G10+M, S355G2+N, S355G3+N, S355G7+N, S355G8+N, S355G9+N, S355G10+N, S420G1+M, S420G2+M, S420G1+QT, S420G2+QT, S460G1+M, S460G2+M, S460G1+QT, S460G2+QT offshore structure steel plate. If you are interested in chemical composition, mechanical property, and yield strength, please contact us.
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