S355J2 steel is one of the popular structural steels used in various industries, especially construction and machine parts. The designation S indicates structural steel, the value 355 specifies the minimum yield strength given in MPa, and the symbol at the end J2 indicates fracture toughness at -20℃.
The S355J2 steel grade is used in structures requiring higher strength and resistance to dynamic loads. Thanks to its higher yield strength compared to S235JR steel, it is ideal for applications in more demanding conditions. The steel contains higher amounts of carbon (up to 0.22%) and manganese (up to 1.60%), which contributes to its strength and hardness. S355J2 steel is also well weldable and exhibits good formability and formability. This makes it easy to shape and process, making it a very good material for structural applications.
The advantage of this steel is that it can be used over a wide temperature range while maintaining high mechanical properties. It can be used at low temperatures, making it suitable for applications in cold climates. In addition, when galvanized, it shows good corrosion resistance and can be used in environments exposed to the elements.
In summary, S355J2 steel is a versatile and strong structural material that is used in many industries. Its high strength, good weldability and resistance to dynamic loads make it an ideal choice for projects requiring reliability and durability.
S2355J2 steel chemical composition
A very important factor in determining the mechanical properties of a steel is its chemical composition. According to melt analysis, the chemical composition of S2355J2 steel should be in accordance with the values given in the table below.
| Designation | C in % max. for a product with nominal thickness in mm | Mn % max. | P % max. | S % max. | Si % max. | Cu % max. | ||
|---|---|---|---|---|---|---|---|---|
| Steel mark | No. of steel | ≤ 40 | >40 | |||||
| S355J2 | 1.0577 | 0,20 | 0,22 | 1,6 | 0,025 | 0,025 | 0,55 | 0,55 |
Steel S355J2 mechanical properties
| Steel | Mechanical properties | ||||
|---|---|---|---|---|---|
| Steel mark | Rp0,2 [MPa] | Rm [MPa] | HB | Elongation [%] | Impact strength |
| S355J2 | 355 | 470 - 630 | 146 - 187 | ≥25 | 27 J (20°C) |
S355J2 steel application
S355J2 steel is widely used in construction and heavy industry where higher strength and resistance to dynamic loads are required. Thanks to its high strength and good weldability, it is often chosen for engineering projects where safety and reliability are crucial.
It is most often used for the construction of:
- bridge structures, i.e. welded and welded structures
- industrial machinery and its parts
- structural elements in civil engineering i.e. for the construction of buildings, halls, towers, concrete reinforcement bars, etc.
- support structures for industrial equipment, e.g. frames, brackets and towers
- support structures for overhead lines, e.g. telecommunication and power towers.
| EU EN | Steel number | Germany DIN | USA AISI | Poland PN |
| S355J2 | 1.0577 | St52-3N | 1020 | 18G2A |
S355J2 vs S235JR comparison
Comparing S355J2 steel with S235JR steel, the main difference is the value of yield strength and tensile strength. S355J2 steel has a higher yield strength (355 MPa) compared to S235JR steel (235 MPa), making it suitable for applications requiring higher strength.
In addition, S355J2 steel exhibits higher impact strength at lower temperatures
(-20℃), which is important in conditions where dynamic loads and low temperatures are present. The table below shows a comparison of the two steels:
| Steel | Mechanical properties | |||
|---|---|---|---|---|
| Steel mark | Rp0.2 [MPa] | Rm [MPa] | HB | Impact strength |
| S235JR | 235 | 360 - 510 | 100 - 154 | 27 J (20°C) |
| S355J2 | 355 | 470 - 630 | 146 - 187 | 60J (-20°C) |
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