TAGS: EN 10225 | Grade S355G2 | marine platform steel plate | Steel for marine engineering | structural steel |
EN 10225 Grade S355G2 normalized or normalized formed (+N)
EN 10225 is a European standard that specifies technical delivery conditions for weldable structural steels used in the fabrication of offshore structures. The standard was developed by the European Committee for Standardization (CEN) and is widely recognized in the oil, gas, and offshore industries.
The EN 10225 standard covers a range of steel grades suitable for various applications in offshore structures, including fixed offshore structures, floating offshore structures, and mobile offshore units. These structures can include platforms, jackets, topsides, subsea structures, and other components used in the offshore environment.
EN 10225 specifies different steel grades based on their minimum yield strength, ranging from S355 to S690. Each grade has specific requirements for toughness, weldability, and impact resistance to ensure the structural integrity and safety of offshore installations.The standard covers a range of steel grades, including:
S355G2+N
S355G3+N
S355G5+M
S355G6+M
S355G7+N
S355G7+M
S355G8+N
S355G8+M
S355G9+N
S355G9+M
S355G10+N
S355G10+M
S420G1+Q
S420G2+Q
S460G1+Q
S460G2+Q
S500G1+Q
S500G2+Q
S500G3+Q
S550G1+Q
S550G2+Q
S550G3+Q
S620G1+Q
S620G2+Q
S620G3+Q
S690G1+Q
S690G2+Q
S690G3+Q
These steel grades have different minimum yield strengths and are suitable for various applications in offshore structures. The EN 10225 standard specifies requirements for chemical composition, mechanical properties, heat treatment, and delivery conditions for each grade.
EN 10225 Grade S355G2 is a weldable structural steel that is primarily used in the fabrication of offshore structures. It belongs to the S355 series of steel grades, which have a minimum yield strength of 355 MPa.
The letter "G" in the grade designation indicates that the steel is specified as "general" structural steel suitable for construction in the offshore industry. The number "2" indicates the quality class within the grade, with higher numbers representing better quality and performance.
EN 10225 Grade S355G2 offers good weldability and high strength properties, making it suitable for use in various offshore applications such as platforms, jackets, topsides, subsea structures, and other components used in the harsh offshore environment.
EN 10225 Grade S355G2 is a weldable structural steel primarily used in the fabrication of offshore structures. The "+N" designation in "S355G2 normalized or normalized formed (+N)" indicates that the steel undergoes a process called normalization or normalizing formation.
Normalization involves heating the steel to a specific temperature and then allowing it to cool in still air. This process helps to refine the grain structure of the steel, improve its mechanical properties, and relieve internal stresses. Normalized steel typically exhibits enhanced toughness and ductility compared to non-normalized steel.
By being designated as "+N," Grade S355G2 indicates that it has undergone this normalization process. This treatment can provide improved properties such as higher strength, better impact resistance, and increased weldability, making it suitable for offshore applications where structural integrity and performance are critical.
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Property
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Value
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Comment
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Carbon equivalent (CEV)
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0.43 [-]
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Cast
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Carbon equivalent note
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CEV = C + Mn/6 + (Cr+Mo+V)/5 + (Cu+Ni)/15 and PCM = C + Si/30 + (Cr+Mn+Cu)/20 + Ni/60 + Mo/15 + V/10 + 5B
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Property
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Temperature
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Value
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Comment
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|---|---|---|---|
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Charpy impact energy
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-20 °C
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50 J
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min. | for thickness 5-20 mm
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Elongation
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22 %
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min. A5.65√So | for thickness 5-20 mm | Transverse
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Tensile strength
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470 - 630 MPa
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for thickness 5-20 mm | Transverse
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Yield strength
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345 MPa
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min. | for thickness 16-20 mm | Transverse
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355 MPa
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min. | for thickness 5-16 mm | Transverse
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Property
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Value
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Comment
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|---|---|---|
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Aluminium
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0.02 %
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min. | for thickness 5-20 mm
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Carbon
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0.2 %
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max. | for thickness 5-20 mm
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Chromium
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0.3 %
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max. | for thickness 5-20 mm
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Copper
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0.35 %
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max. | for thickness 5-20 mm
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Manganese
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0.9 - 1.65 %
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for thickness 5-20 mm
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Molybdenum
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0.1 %
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max. | for thickness 5-20 mm
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Nickel
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0.5 %
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max. | for thickness 5-20 mm
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Niobium
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0.06 %
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max. | for thickness 5-20 mm
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Nitrogen
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0.015 %
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max. | for thickness 5-20 mm
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Phosphorus
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0.035 %
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max. | for thickness 5-20 mm
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Silicon
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0.5 %
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max. | for thickness 5-20 mm
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Sulfur
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0.03 %
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max. | for thickness 5-20 mm
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Titanium
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0.03 %
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max. | for thickness 5-20 mm
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Vanadium
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0.12 %
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max. | for thickness 5-20 mm
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Property
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Application areas
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Offshore structures such as platforms and equipment for new offshore windmill towers.
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Chemical composition
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A ratio Al/N ≥ 2 shall be applied The above chemical properties are based on cast analysis data. Product analysis may be requested at the time of order.
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Delivery condtion
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For the dimensions available please visitDimension tables (see Table A). Table A with a thickness range as indicated in the Mechanical properties.
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Other
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Available options Options available (after previous agreement):
Ultrasonic testing
Reduced carbon equivalent (CEV) or parameter crack measurement (PCM) value
Transversal impact test
Improved deformation properties perpendicular to the surface of the product as per EN 10164 (Z test)
Post-weld heat treatment test (PWHT)
Other options specified in the standard
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