Steel for
Structures
Exploring the Secrets of Structural Steels
Structural steels play a fundamental role in the construction of a wide range of infrastructure, from industrial warehouses to towering bridges and towering electricity pylons. In this article, we delve into the fascinating world of these steels, exploring their key characteristics, properties, and requirements to ensure optimal performance in demanding structural applications.
General Features and Technical Specifications
Structural steels, classified according to the EN10025 standard, are widely used materials in the construction industry due to their versatility and strength. These steels are identified by their guaranteed minimum yield strength (represented as E and expressed in N/mm²) or by their ultimate strength (represented as R and expressed in N/mm²), allowing engineers and designers to select the most suitable material for each specific application.
In addition to basic mechanical properties, such as yield strength and ultimate strength, structural steels may require complementary properties, such as resilience, which is measured in Joules and tested at different temperatures. These additional properties are essential to ensure optimal material performance under varying environmental conditions and demanding applications.
Identification and Symbols
Structural steels are identified by the letter “S” followed by the yield strength value in N/mm². They may also bear symbols denoting other important properties, such as toughness, measured in joules and tested at different temperatures. For example, S355J2G3 and S355J0 steels, also known as St 52-3 N and St 52-3 U respectively, show variations in toughness that make them suitable for various service conditions.
| EN 10 025 A 1:1993 | Elastic Limit * Re N/mm² |
Breaking Load Rm N/mm² |
DIN 17100 |
|---|---|---|---|
| S 235 xxx | 235 mín | <3mm: 360-510 >3mm: 340-470 |
RSt 37-2 |
| S 275 xxx | 275 mín | <3mm: 430-580 >3mm: 410-560 |
St 44-2 |
| S 355 xxx | 355 mín | <3mm: 510-680 >3mm: 490-630 |
St 52-3 |
| Resilience | Test Temperature | Supply |
|---|---|---|
| J = 27 Julios | R = Tª ambiente | G1 = Efervescente |
| K = 40 Julios | 0 = 0°C | G2 = Calmado |
| L = 60 Julios | 2 = -20°C | G3 = Normalizado |
| 3 = -30°C | G4 = s/Fabricante | |
| 4 = -40°C |
Essential Requirements and Considerations for Weldability
To meet quality and performance standards, structural steels must meet two essential basic conditions:
- A low carbon equivalent content. Carbon equivalent is calculated using a formula that takes into account various alloying elements present in the steel, and values above 0.42 may require additional precautions during the welding process.
– Preheat the areas to be welded before welding
– Slow down the cooling rate after welding
- Knowing the toughness of steel through laboratory testing at low temperatures is crucial to ensuring its resistance to fracture and deformation under adverse environmental conditions throughout its useful life.
These fundamental requirements determine the chemical composition of the steel, which must be carefully designed by the manufacturer to meet technical specifications and market demands.
In short, structural steels are vital materials in the construction industry, offering strength, durability, and versatility for a wide range of applications. By understanding the essential characteristics, specifications, and requirements of these steels, engineers and designers can select the most appropriate material for each project, ensuring its long-term success and safety.
Join us in the next article as we explore even more of the secrets of steels!
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