Here's a detailed overview of S355K2G4, a high-performance low alloy high yield strength steel plate compliant with the European standard EN 10025-4. This grade is renowned for its exceptional mechanical properties, particularly in cold environments and critical structural applications.

1. Grade Designation and Key Parameters

S355K2G4 Explanation:

S: Structural steel.

355: Minimum yield strength of 355 MPa (for thickness ≤16mm).

K2: Denotes impact toughness at -20°C with a minimum energy of 27 J (纵向,longitudinal direction).

G4: Indicates the steel is produced using fully killed steel practice (deoxidized with aluminum, ensuring uniform microstructure and minimal porosity).

Standards Compliance:

EN 10025-4: High-strength structural steels, quenched and tempered (Q&T) or normalized.

Equivalent Grades:

Chinese: Q355D (close match, but check impact test temperatures).

American: ASTM A572 Grade 50 (no direct K2G4 equivalent, but A572 Gr 50 with optional impact testing).

 

 

 

 

 

 

 

Advantages Over Other Grades

Grade	S355K2G4	S355J2 (EN 10025-2)	Q345D (GB/T 1591)
Impact Temp	-20°C (K2)	-20°C (J2)	-20°C (D grade)
Production Practice	Fully killed (G4)	Semi-killed or killed	Normalized
P/S Content	≤0.025% (stricter)	≤0.035%	≤0.035%
Typical Use	Critical structures in cold climates	General cold-region structures	Chinese cold

 

 

 

 

 

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