S355M weathering steel chemical composition and mechanical properties

The chemical composition and mechanical properties of S355M weathering steel are as follows:

Chemical composition of S355M weathering steel:
Carbon (C) content: Usually between 0.14% and 0.22%, which helps to provide the right strength and toughness.
- Silicon (Si) content: usually below 0.50%.
- Manganese (Mn) content: usually below 1.60%, the addition of manganese can increase the hardening ability and strength.
- Phosphorus (P) content: Maximum 0.035%. High phosphorus content may negatively affect welding performance.
- Sulfur (S) content: Maximum 0.030%. Low sulfur content helps to improve welding performance.
- Niobium (Nb) content: usually between 0.06% and 0.10%, the addition of niobium can improve impact toughness.
Molybdenum (Mo) content: usually below 0.30%, the addition of molybdenum can improve strength and toughness.

Mechanical properties of S355M weathering steel:
Yield Strength: The yield strength of S355M weathering steel is a minimum of 355MPa, meaning that when loading exceeds this value, the material begins to produce plastic deformation.
- Tensile Strength: The tensile strength of S355M weathering steel is 470 to 630MPa, which is the maximum tensile force that the material can withstand.
Elongation (elongation) : The elongation of S355M weathering steel is usually between 22% and 27%, indicating the ductility of the material before breaking.
Reduction of Area: The reduction of area of S355M weathering steel is usually between 45% and 55%, indicating the plastic deformation ability of the material in the fine neck area before fracture.

It is important to note that the specific chemical composition and mechanical properties may vary according to manufacturer and standard requirements. Therefore, in practical applications, it is recommended to refer to the specific S355M weathering steel specification table or contact the supplier to obtain accurate data.