introduction material of S355 series

The S355 series is a group of structural steel grades designated by the European standard EN 10025. These grades are widely used in various construction and engineering applications due to their excellent mechanical properties and versatility. Here are some materials within the S355 series:

1. S355JR: S355JR is the most common grade in the S355 series. It offers good strength, ductility, and weldability, making it suitable for a wide range of structural applications.

2. S355J0: S355J0 is characterized by its enhanced impact strength, making it ideal for structures subjected to dynamic loading conditions. It is often used in bridges, machinery, and offshore structures.

3. S355J2: S355J2 is similar to S355JR but with improved impact resistance at low temperatures. It is commonly used in construction, civil engineering, and structural applications requiring higher toughness.

4. S355K2: S355K2 is a grade with a higher yield strength compared to other members of the S355 series. It is particularly suitable for load-bearing structures and heavy machinery.

5. S355NL: S355NL is a normalized weldable fine grain structural steel. It offers good toughness and excellent weldability, making it suitable for low-temperature applications and structures exposed to harsh environments.

The S355 series steel grades exhibit a minimum yield strength of 355 megapascals (MPa) and conform to European standards, ensuring consistent quality and performance. These materials are known for their high strength-to-weight ratio, which allows for efficient designs and cost-effective construction.

It’s important to consult the specific requirements and standards of your project to determine the most appropriate material within the S355 series for your application.

S355JR is a grade of steel that is commonly used in construction and engineering applications. It is part of the S355 series of structural steel grades designated by the European standard EN 10025. The “JR” in S355JR stands for “Junior,” which means that the steel has undergone a Charpy V-notch impact test at 27 Joules at room temperature.

Here are some key characteristics and properties of S355JR steel:

1. Strength: S355JR has a minimum yield strength of 355 megapascals (MPa), which makes it a relatively strong structural steel grade.

2. Ductility: It offers good ductility, allowing it to be easily formed and shaped without compromising its structural integrity.

3. Weldability: S355JR steel exhibits excellent weldability, which means it can be readily welded using common welding methods.

4. Impact resistance: The Charpy V-notch impact test performed on S355JR determines its resistance to brittle fracture and its ability to absorb energy during impact or sudden loading.

5. Structural applications: S355JR is widely used in various structural applications, including building frames, bridges, offshore structures, machinery, and equipment.

It’s important to note that while S355JR is a popular steel grade, there are other grades within the S355 series, such as S355J0, S355J2, etc., which have slightly different properties and applications.

The chemical composition and mechanical properties of S355JR steel are as follows:

Chemical Composition (in weight percentage):

– Carbon (C): 0.24%
– Silicon (Si): 0.55%
– Manganese (Mn): 1.60%
– Phosphorus (P): 0.035%
– Sulfur (S): 0.035%
– Nitrogen (N): 0.012%
– Copper (Cu): 0.55% (max)
– Chromium (Cr): 0.30% (max)
– Nickel (Ni): 0.30% (max)
– Molybdenum (Mo): 0.10% (max)

Mechanical Properties:

– Yield Strength (Reh): Minimum 355 megapascals (MPa)
– Tensile Strength (Rm): 470-630 MPa
– Elongation (A): Minimum 22% (in 200mm), minimum 17% (in 50mm)
– Charpy V-notch Impact Test: 27 Joules at room temperature

These values are based on the EN 10025-2:2004 European standard for hot-rolled structural steel. It’s important to note that the mechanical properties may vary slightly depending on the thickness of the steel plate or the form of the material (e.g., bar, sheet, or coil).

S355JR is known for its good weldability, machinability, and formability, making it suitable for various structural applications. Its combination of strength and ductility allows for efficient and cost-effective designs in construction, engineering, and manufacturing industries.