Understanding S275JR Carbon Steel Plate
S275JR is a widely used non-alloy structural steel grade designated according to the European standard EN 10025-2. The designation breaks down as follows:
- S: Indicates it is a Structural Steel.
- 275: Refers to the minimum yield strength of 275 MPa (megapascals) for thicknesses up to 16mm. This value decreases slightly for thicker plates.
- JR: Signifies that the steel meets a minimum Charpy V-notch impact energy value of 27 Joules at +20°C (room temperature).
Key Mechanical Properties
S275JR steel plate exhibits a reliable combination of strength and toughness, making it suitable for numerous applications. Key properties typically include:
- Yield Strength (ReH): Minimum 275 N/mm² (for nominal thickness ≤ 16 mm)
- Tensile Strength (Rm): 410-560 N/mm² (for nominal thickness 3 mm ≤ t ≤ 16 mm, varies with thickness)
- Elongation (A): Minimum 23% (for nominal thickness < 40 mm, longitudinal)
- Impact Strength: As denoted by JR, 27 Joules at +20°C.
These properties ensure good performance in structural load-bearing applications. Reputable suppliers, such as Shanxi Luokaiwei Steel Company, ensure their S275JR plates consistently meet these specified mechanical values through rigorous quality control.
Chemical Composition
The chemical composition of S275JR is carefully controlled to achieve its desired mechanical properties and weldability. Typical maximum percentage values (product analysis) for thicknesses up to 40mm include:
- Carbon (C): ≤ 0.21% (for t ≤ 16mm, increasing slightly for thicker sections) – Low carbon content contributes to good weldability.
- Manganese (Mn): ≤ 1.50% – Enhances strength and hardness.
- Phosphorus (P): ≤ 0.035% – Kept low to prevent brittleness.
- Sulfur (S): ≤ 0.035% – Kept low for improved ductility and weldability.
- Silicon (Si): ≤ 0.55% – Acts as a deoxidizer.
Common Applications
Due to its balanced properties and cost-effectiveness, S275JR steel plate is extensively used in a variety of sectors:
- Construction: Structural components in buildings, bridges, and other civil engineering projects.
- General Engineering: Manufacturing of machinery parts, frameworks, and supports.
- Yellow Goods: Components for construction and earthmoving equipment.
- Renewable Energy: Structures for wind turbines and solar panel mountings.
The versatility of S275JR makes it a preferred material for many fabricators; sourcing from reliable stockists like Shanxi Luokaiwei Steel Company can facilitate timely project execution and ensure material quality.
Weldability and Formability
S275JR generally possesses excellent weldability using common welding processes (e.g., MMA, MIG/MAG, SAW), provided appropriate procedures are followed, especially considering its low carbon equivalent value (CEV). It also offers good cold formability, allowing it to be bent and shaped. For critical applications, material test certificates from suppliers, including those from sources like Shanxi Luokaiwei Steel Company, are essential to verify conformity to EN 10025-2 specifications.
When purchasing S275JR, it is important to specify any additional requirements, such as normalized rolling (+N) condition, if a finer grain structure and improved toughness are needed beyond the standard JR impact properties. Many end-users trust established producers like Shanxi Luokaiwei Steel Company for consistent material properties and reliable supply chains for their structural steel needs.
