S355J2 - 1.0577

S355J2, also known by the steel number 1.0577, is a low-carbon, non-alloy structural steel that falls under the European standard EN 10025-2.

The "S" denotes "structural," indicating its use in load-bearing structures, while "355" refers to its minimum yield strength of 355 megapascals. This yield strength is the stress level at which the steel can withstand deformation, making it suitable for a variety of construction and engineering applications.

The "J2" portion of the classification signifies the material's resilience to impacts at low temperatures, specifically at -20°C, with a minimum energy absorption of 27 joules. This property ensures the steel's toughness in colder climates and its suitability for outdoor structures subjected to harsh environmental conditions.

Chemically, S355J2 is composed of elements like manganese, silicon, and minor levels of phosphorus and sulfur. These elements contribute to the steel's mechanical stability and enhance its structural capabilities. Its low carbon content ensures improved weldability without preheating, a valuable characteristic for constructing complex and large structures.

S355J2 is widely used across various applications, including heavy machinery like bulldozers and excavators, as well as construction for oil and gas platforms, transmission towers, and railcars. Its robust tensile strength, weldability, and impact resistance make it a versatile choice in both civil and industrial engineering.

Mechanical Properties

Chemical Properties

Applications

S355J2 steel is widely used across numerous industries due to its ideal combination of mechanical properties, making it suitable for both construction and machine building.

In construction, it is used in industrial and civil projects, particularly for metal structures like bridges and high-rise buildings. Its robust characteristics and ability to sustain impact energy make it a preferred choice for infrastructure built in cold regions, such as Arctic oil and gas pipelines.

In mechanical engineering, S355J2 is utilized in manufacturing various components of heavy machinery, such as dump trucks. It is also integral to the production of railway wagons and agricultural equipment. The steel's improved weldability, especially in the S355J2G3 variant, makes it suitable for high-demand, low-temperature projects requiring superior welding quality. Moreover, S355J2 is employed in the creation of offshore structures, further highlighting its versatility.

The grade is not generally recommended for applications where superior corrosion resistance is a primary concern, such as marine environments, unless it receives appropriate protective coatings.