S355J2

S355J2 Alloy Steel Product Overview

S355J2 is a low-carbon, high-strength structural steel under the EN 10025-2 standard, known for its excellent strength, toughness, and weldability. This non-alloy steel is part of the S355 family, offering a minimum yield strength of 355 MPa (for thicknesses ≤16 mm) and good impact resistance, particularly at low temperatures (tested at -20°C, denoted by "J2"). Typically supplied in the normalised or controlled rolled condition, S355J2 is a versatile material used in structural and engineering applications requiring durability and resistance to dynamic loads. Its low alloy content ensures good machinability and cost-effectiveness.

Applications

S355J2 is widely used in construction, engineering, and industrial applications where high strength and toughness are required:

Structural Applications:

• Building and bridge construction (beams, columns, and trusses).
• Offshore structures, such as oil platforms and wind turbine towers.
• Infrastructure projects, including railway bridges and road barriers.

Engineering Components:

• Cranes, heavy machinery frames, and lifting equipment.
• Structural components in agricultural and construction machinery.
• Piles and supports for foundation engineering.

Other Uses:

• Shipbuilding and marine structures.
• Pressure vessels and storage tanks (non-critical applications).
• Pipelines and structural hollow sections.

Chemical Composition

The chemical composition of S355J2 ensures its strength, toughness, and weldability:

• Carbon (C): Limited to ensure weldability and toughness.
• Manganese (Mn): Enhances strength and hardenability.
• Silicon (Si): Improves strength and elasticity.
• Phosphorus (P) and Sulfur (S): Kept low to minimise brittleness and improve weldability.
• Copper (Cu): Optional, enhances corrosion resistance.
• Nitrogen (N): Controlled to ensure fine-grain structure.

Supply Size

S355J2 is available in various forms and sizes to meet industrial requirements:

• Round Bars:
  Diameter 16 mm to 700 mm.
• Flat Bars:
  Minimum: 10 mm thickness x 80 mm width.
  Maximum: 500 mm thickness x 2000 mm width.