EN 10025 S275NL Low Alloy Steel Plate

EN 10025 S275NL is a normalized low-alloy structural steel plate specified in the European standard EN 10025, renowned for its excellent combination of strength, toughness, and weldability. It is widely used in construction, machinery manufacturing, and engineering structures requiring reliable performance under dynamic or low-temperature conditions. Below is a detailed overview of its key attributes, chemical composition, mechanical properties, applications, and processing considerations:

1. Chemical Composition (Typical, % by Weight)

The alloying elements in S275NL are carefully balanced to enhance strength and low-temperature toughness, with strict limits on harmful elements to ensure purity:

 

Element	Content Range	Role
Carbon (C)	≤0.20	Improves strength; controlled to avoid brittleness.
Manganese (Mn)	1.50 max	Enhances strength and toughness; promotes grain refinement.
Silicon (Si)	0.55 max	Aids deoxidation; improves strength.
Phosphorus (P)	≤0.025	Restricted to prevent low-temperature brittleness.
Sulfur (S)	≤0.015	Limited to reduce hot cracking during welding.
Aluminum (Al)	≥0.02	Acts as a deoxidizer; refines grains for better toughness.
Niobium (Nb), Vanadium (V), Titanium (Ti)	≤0.05 (total)	Microalloying elements; refine grains and strengthen via precipitation.

2. Mechanical Properties

S275NL is defined by its high strength, good ductility, and excellent notch toughness, especially at low temperatures:

 

Yield Strength: ≥275 MPa (for thickness ≤16 mm; decreases slightly with increasing thickness, e.g., ≥255 MPa for 40-63 mm).

Tensile Strength: 410-560 MPa.

Elongation: ≥22% (for thickness ≤16 mm).

Notch Toughness: Charpy V-notch (CVN) impact energy ≥27 J at -50°C (normalized condition), ensuring resistance to brittle fracture in cold environments.

 

 

 

 

 

 

 

 

 

 

 

 

 

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