Unlocking Strength: A Guide to EN10025-4 Thermomechanical Rolled Structural Steels

Introduction: EN10025-4 is a European standard for hot-rolled structural steel products. It is part of the EN 10025 series of standards which specifies technical delivery conditions for flat and long products of hot rolled structural steels. EN10025-4 specifically focuses on thermomechanical rolled weldable fine grain structural steels.

 

Here are the main aspects of the EN10025-4 specification, including its sub-grades and end uses:

 

Main aspects of EN10025-4:

Scope: EN10025-4 covers technical delivery conditions for thermomechanical rolled weldable fine grain structural steels in the grades S275M, S275ML, S355M, S355ML, S420M, S420ML, S460M, and S460ML.

 

Chemical Composition: The standard specifies the chemical composition requirements for these grades of steel, including elements such as carbon, manganese, silicon, phosphorus, sulfur, niobium, vanadium, titanium, and aluminum.

 

Mechanical Properties: EN10025-4 defines the mechanical properties such as yield strength, tensile strength, elongation, and impact energy for each grade of steel at different thicknesses.

 

Thermomechanical Rolling: The steel grades covered by EN10025-4 undergo thermomechanical rolling during the manufacturing process, which involves controlled rolling and cooling to achieve the desired mechanical properties.

 

Weldability: The steels specified in EN10025-4 are designed to be weldable with standard welding methods, providing suitable precautions are taken during welding to avoid detrimental effects on the material properties.

 

Sub-grades of EN10025-4:

S275M, S275ML: These grades are thermomechanical rolled weldable fine grain structural steels with minimum yield strengths of 275 MPa. They are suitable for general structural engineering applications.

 

S355M, S355ML: These grades are thermomechanical rolled weldable fine grain structural steels with minimum yield strengths of 355 MPa. They offer higher strength compared to S275 grades and are often used in building construction, bridges, and machinery.

 

S420M, S420ML: These grades are thermomechanical rolled weldable fine grain structural steels with minimum yield strengths of 420 MPa. They offer even higher strength compared to S355 grades and are suitable for applications requiring higher load-bearing capacity, such as heavy construction equipment and structural components in large buildings.

 

S460M, S460ML: These grades are thermomechanical rolled weldable fine grain structural steels with minimum yield strengths of 460 MPa. They provide the highest strength within the EN10025-4 standard and are used in applications where exceptionally high strength is required, such as in heavy-duty lifting equipment, offshore structures, and high-rise buildings.

 

End Uses:

The end uses of EN10025-4 compliant steels are similar to those of EN10025-3, as they are both structural steels suitable for a wide range of applications in construction, infrastructure, machinery, and other industries. These end uses include:

Structural components in buildings and bridges

Offshore platforms and structures

Crane booms and chassis

Mining equipment

Pressure vessels

Transportation vehicles such as trucks, trailers, and railway wagons

Additional Information of Suffix Used for Each Sub Grades:

Designation for a specific grade of structural steel in the EN 10025-4 standard. Let's break down the meaning of this designation:

S: Structural steel. This indicates that the steel is intended for structural applications, such as building construction, bridges, and other load-bearing structures.

275/355/420/460: Minimum yield strength of 460 MPa. This number denotes the minimum amount of stress the steel can withstand before it begins to deform plastically. In this case, S460ML has a minimum yield strength of 460 megapascals (MPa).

M: Thermomechanical rolling. The "M" indicates that the steel has been subjected to thermomechanical rolling during its production process. Thermomechanical rolling involves controlled rolling and cooling to improve the mechanical properties of the steel, particularly its strength and toughness.

L: Low temperature. The "L" indicates that the steel has been tested for its impact properties at low temperatures. This ensures that the steel retains its strength and toughness even in cold environments.

 

Overall, EN10025-4 provides specifications for thermomechanical rolled weldable fine grain structural steels that offer good weldability, high strength, and toughness, making them suitable for various structural and engineering applications.

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