Difference between S460G1+M and S460G2+M steel plate

S460G1+M is a high-strength offshore structural steel plate certified under EN 10225 for fixed offshore structures, oil and gas platforms, and wind turbine foundations . The "+M" suffix indicates the thermomechanical controlled process (TMCP) , which refines grain structure through controlled rolling and accelerated cooling without additional heat treatment . It has a minimum yield strength of 460 MPa (for thickness ≤16mm) and tensile strength ranging from 540 to 700 MPa, with a minimum elongation of 17% . Maximum plate thickness is 100 mm . The chemical composition includes carbon ≤0.14% and sulfur ≤0.010% .

S460G2+M is also a thermomechanical rolled offshore structural steel certified under EN 10225, sharing the same minimum yield strength of 460 MPa and tensile strength range of 540-700 MPa as G1 . However, S460G2+M offers stricter chemical composition controls, featuring a lower sulfur limit of ≤0.007% (compared to ≤0.010% for G1) . The higher "G" number (G2 vs. G1) signifies more stringent requirements for purity and toughness. Like G1, it is impact tested at -40°C with a minimum energy requirement of 60 Joules .

Both S460G1+M and S460G2+M are EN 10225-certified thermomechanical rolled offshore structural steels with identical mechanical properties (minimum yield 460 MPa, tensile 540-700 MPa) and impact requirements (-40°C, 60J) . Their primary difference lies in chemical purity: S460G1+M is suitable for general offshore applications, while S460G2+M features stricter limits on sulfur (≤0.007%), offering enhanced low-temperature toughness and weldability for more demanding offshore structures . Both grades maintain good weldability and are available up to 100mm thickness . The selection between them depends on whether the project requires standard offshore performance (G1) or enhanced purity and toughness for critical applications (G2) .

Mechnical property for S460G1+M steel plate:
 

Mechnical property for S460G2+M steel plate:
 

Chemical composition for S460G1+M steel plate 
 

Chemical composition for S460G2+M steel plate