S275JR Low Alloy Steel

S275JR Low-Alloy Steel: Composition, Properties, and Applications

Composition

S275JR is a non-alloy structural steel grade classified under the European standard EN 10025-2. Its chemical composition primarily consists of:

Carbon (C): ≤ 0.21%

Manganese (Mn): ≤ 1.50%

Silicon (Si): ≤ 0.50%

Phosphorus (P): ≤ 0.035%

Sulfur (S): ≤ 0.035%

The "JR" designation indicates good impact resistance at room temperature (minimum 27 J at 20°C), making it suitable for welded structures and general construction.                                                                                                                                                                                                                                                                 

Mechanical Properties

Yield Strength (Re): ≥ 275 MPa

Tensile Strength (Rm): 410–560 MPa

Elongation (A₅): ≥ 23% (depending on thickness)

Impact Toughness (KV): ≥ 27 J at +20°C

S275JR offers excellent weldability, formability, and machinability, balancing strength and ductility for structural applications.

Applications

Due to its cost-effectiveness and reliable performance, S275JR is widely used in:

Construction: Steel frames, beams, columns, and reinforcement structures.

Infrastructure: Bridges, transmission towers, and support structures.

General Engineering: Machinery components, storage tanks, and industrial equipment.

Transportation: Chassis and structural parts in heavy vehicles.

Its compliance with EN 10025-2 ensures consistent quality, making it a preferred choice for load-bearing structures in moderate environments.

Hot Tags: s275jr low alloy steel, China s275jr low alloy steel suppliers, factory, S44004, HARDOX600, CuZn36Pb3, SUS420J1, E250C N, 500HB Steel