S355G9+M steel plate for offshore platform

1. S355G9+M steel plate belongs to high-strength structural steel products with good comprehensive mechanical properties, welding properties and process properties. It is suitable for manufacturing structural parts such as offshore oil production platforms and terminal equipment. The impact of S355G9+M is -40 degrees, and the 9 after G represents the relevant number for the characteristics of the steel. As for the latter, +M means thermomechanical rolling, which is just a method of naming steel numbers in the standard.

2. Chemical composition of S355G9+M steel for offshore platform:

C Si Mn P S Ni Cr Mo Cu
≤0.12 0.15-0.55 ≤1.65 ≤0.015 ≤0.005 ≤0.7 ≤0.2 ≤0.08 ≤0.3
Nb V Ti Alt N B Ca Pb  
≤0.03 ≤0.06 ≤0.025 0.015-0.055 ≤0.010 ≤0.0005 ≤0.005 ≤0.010  

3. Mechanical properties of S355G9+M offshore platform steel plate:
Delivery state Thickness Mechanical properties
Hot rolled ≤16mm ReH(MPa) ≥355 ReH/Rm≤0.93
Rm(MPa) 470~630  
A(%) ≥22 Horizontal
Impact temperature(℃) -40  
Akv(J) ≥50  
Performance description Delivery state: TMCP
>16-25mm ReH(MPa) ≥355 ReH/Rm≤0.9
Rm(MPa) 470~630  
A(%) ≥22 Horizontal
Impact temperature(℃) -40  
Akv(J) ≥50  
Performance description Delivery state:TMCP
>25-40mm ReH(MPa) ≥345 ReH/Rm≤0.9
Rm(MPa) 470~630  
A(%) ≥22 Horizontal
Impact temperature(℃) -40  
Akv(J) ≥50  
Performance description Delivery state:TMCP
>40-63mm ReH(MPa) ≥335 ReH/Rm≤0.9
Rm(MPa) 470~630  
A(%) ≥22 Horizontal
Impact temperature(℃) -40  
Akv(J) ≥50  
Performance description Delivery state:TMCP
>63-100mm ReH(MPa) ≥325 ReH/Rm≤0.9
Rm(MPa) 470~630  
A(%) ≥22 Horizontal
Impact temperature(℃) -40  
Akv(J) ≥50  
Performance description Delivery state:TMCP

4. Delivery status of S355G9+M steel plate: normalizing, controlled rolling.

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