ASTM A572 Grade 50 vs S355JR
ASTM A572 Grade 50 and S355JR are both high-strength, low-alloy structural steels commonly used in construction and engineering. While they have similar properties and can often be used interchangeably, there are some key differences to consider.
ASTM A572 Grade 50:
ASTM A572 Grade 50 chemical composition
Carbon (C): Maximum 0.23%
Manganese (Mn): 1.35%
Phosphorus (P): Maximum 0.040%
Sulfur (S): Maximum 0.050%
Silicon (Si): 0.15 - 0.40%
Vanadium (V): 0.01 - 0.15% (when specified)
Columbium (Cb): 0.005 - 0.05% (when specified)
Copper (Cu): Minimum 0.20% (when specified)
Origin: Defined by the American Society for Testing and Materials (ASTM).
Strength: Minimum yield strength of 345 MPa (50 ksi).
A572 Grade 50 Equivalent Materials:
EN S355: A European standard steel grade with similar properties to A572 Grade 50.
JIS SM490: A Japanese standard steel grade with comparable characteristics.
GB Q345B: A Chinese standard steel grade that is often considered equivalent.
S355JR:
S355JR chemical composition:
Carbon (C): Maximum 0.24%
Manganese (Mn): Maximum 1.70%
Phosphorus (P): Maximum 0.045%
Sulfur (S): Maximum 0.045%
Nitrogen (N): Maximum 0.014%
Silicon (Si): Maximum 0.60%
Copper (Cu): Maximum 0.60%
Origin: Defined by the European standard EN 10025-2.
Strength: Minimum yield strength of 355 MPa for thicknesses up to 16mm.
S355JR equivalent
S355JR steel, a European standard (EN 10025-2) structural steel, has several equivalents in other standards. A572 Grade 50 (ASTM standard) and ST52-3 (German DIN standard) are common equivalents. Other equivalents include Q355B (Chinese standard) and SM490B (Japanese standard). These materials share similar chemical compositions and mechanical properties, particularly yield strength and tensile strength, making them suitable for similar structural applications.
