ThePipingMart Blog Grades S355 Grade Steel – Composition, Properties, and Uses

S355 Grade Steel – Composition, Properties, and Uses

S355 Grade Steel

In our modern world, steel remains a precious material which performs essential roles in diverse industries. Many types of steel are available on the market, and one that stands out is S355 Grade Steel. This is a high-yield non-alloy steel that is ideal for both structural and engineering applications. Its popularity comes from its exceptional durability and strength. This blog will explore the composition, physical and mechanical properties, uses, hardness, and heat treatment of S355 Grade Steel.

S355 Grade Steel Composition

S355 Grade Steel is a low manganese, carbon, and silicon alloy. It is available in several forms, such as plates, bars, and sections. Combining these elements makes the steel achieve high durability, tensile strength, and resistance to abrasion and impact. Various grades exist, such as S355J2, S355JR, S355K2, and S355J0. Each variation has a unique composition to suit specific applications.

Ni Cr Mo Si Mn Cu C S P CEV*
Max 0.55 1.6 0.55 0.22 0.030 0.030 0.47

S355 Grade Steel Physical Properties

S355 Grade Steel has a range of impressive physical characteristics that make it ideal for demanding applications. Its density measurement is 7.85 g/cm3. The melting point of S355 grade steel is around 1420 to 1460°C. It also has excellent weldability and formability and can withstand extreme temperatures. All these properties mean that S355 Grade Steel can be used in various industries such as automotive, shipbuilding, and construction.

S355 Grade Steel Mechanical Properties

Besides its physical properties, S355 Grade Steel has impressive mechanical properties, making it popular in specific industries. S355 Grade Steel has a minimum yield strength of 355MPa, and its ultimate tensile strength is estimated at 470 to 630 MPa. It also has high elongation that ranges from 22% to 25%. Other mechanical properties of S355 Grade Steel include low-temperature impact tests, corrosion resistance, and fatigue strength.

S355 Grade Steel Uses

S355 Grade Steel is versatile and thus is ideal for various applications. The most popular ones include structural steel fabrication and heavy engineering. The automotive industry uses S355 Grade Steel to manufacture safety cages, seat frames and suspension components. It’s also used in shipbuilding due to its excellent strength-to-weight ratio. Other applications include wind turbines, pressure vessels, cranes, and drilling rigs.

S355 Grade Steel Hardness

The hardness of S355 Grade Steel depends on its carbon, manganese, and silicon composition. The variation of each element affects the final hardness properties. The carbon content of the steel determines the hardness level when heat treatment is applied. Generally, S355 Grade Steel has a Brinell hardness of 150 to 190 HBW, ideal for heavy-duty applications.

S355 Grade Steel Heat Treatment

S355 Grade Steel can undergo different heat treatment processes to improve its mechanical properties. Typical heat treatment processes include quenching, tempering, normalizing, and annealing. During quenching and tempering, the steel is subjected to high temperatures and cooled rapidly, making it much stronger. Normalizing makes the steel more malleable and improves strength, while annealing reduces internal stress and machinability.


S355 Grade Steel is an excellent non-alloy steel for industries requiring high strength and durability. It’s versatile and ideal for many applications, such as structural steel fabrication, heavy engineering, and shipbuilding. The physical and mechanical properties of S355 Grade Steel make it suitable for harsh environments and demanding uses. Further, heat treatment processes like quenching and tempering, normalizing, and annealing help improve its properties even further. S355 Grade Steel is a reliable and essential material in various industries, and understanding its composition, properties, and applications is crucial for those utilizing it.

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