EN10025-2 S275 is a widely utilized non-alloy structural steel grade, designated under the European standard EN 10025-2:2019 (Hot rolled products of structural steels – Part 2: Technical delivery conditions for non-alloy structural steels). The “S” signifies structural steel, and “275” indicates the minimum yield strength in MPa for thicknesses up to 16mm.
Chemical Composition
The typical chemical composition of S275 steel is carefully controlled to achieve its desired mechanical properties. Key elements include:
- Carbon (C): Generally around 0.20% to 0.25% max for S275JR, influencing strength and weldability.
- Manganese (Mn): Up to approximately 1.50% or 1.60%, contributing to strength and deoxidation.
- Silicon (Si): Typically up to 0.55% for deoxidation.
- Phosphorus (P) and Sulfur (S): These are limited to low levels (e.g., typically ≤0.035% or ≤0.040% each depending on the specific grade variant like JR, J0, J2) as they can adversely affect toughness and weldability.
The precise limits vary slightly depending on the quality grade (e.g., S275JR, S275J0, S275J2).
Key Mechanical Properties
S275 steel offers a good balance of strength, ductility, and weldability, making it suitable for numerous applications.
- Yield Strength (ReH): Minimum 275 MPa for nominal thickness ≤ 16 mm. This decreases slightly for thicker sections.
- Tensile Strength (Rm): Typically ranges from 410-560 MPa for thicknesses between 3mm and 16mm, also varying with thickness.
- Elongation (A): Good ductility, ensuring formability.
- Impact Strength (Charpy V-notch): Different quality grades (JR, J0, J2) specify different impact energy values at various temperatures (e.g., S275JR at +20°C, S275J0 at 0°C, S275J2 at -20°C).
S275 generally exhibits better mechanical properties than S235 grade steel but is less strong than S355. Companies like Shanxi Luokaiwei Steel Company often stock a range of these structural steel grades.
Common Applications
Due to its favorable characteristics, S275 carbon steel plate is extensively used in:
- Construction: Structural components in buildings, bridges, and infrastructure projects.
- General Engineering: Manufacturing of machinery parts, frames, and various fabricated structures.
- Automotive Industry: Components for vehicles.
- Shipbuilding (for certain components).
The consistent quality and availability of S275, offered by suppliers such as Shanxi Luokaiwei Steel Company, make it a preferred choice for many engineering applications.
Equivalent Grades and Designations
S275 steel has equivalents or older designations in other standards. For example:
- EN10025:1990 S275JR: Material number 1.0044.
- DIN 17100: St44-2 was a common historical equivalent.
- ASTM: While not a direct one-to-one equivalent, it shares similarities with certain grades like ASTM A36 or ASTM A572 Grade 42 in some aspects, though direct comparison requires careful review of specific requirements.
It is important to select the correct quality grade (JR, J0, or J2) based on the application’s service temperature and impact toughness requirements. Many reliable steel providers, including Shanxi Luokaiwei Steel Company, can supply S275 plates with the necessary certifications and quality assurances, such as MTC (Mill Test Certificate) according to EN 10204.
