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The EN10025-6 high strength structural steel grades are a range of steels used for applications requiring high levels of strength and durability. EN10025-6 standard include many grades, each with different mechanical properties and chemical composition. These grades are: S460Q, S460QL, S460QL1, S500Q, S500QL, S500QL1, S690Q, S690QL, S690QL1, S620Q, S620QL, S620QL1. Each grade has a specified minimum yield strength and a specified minimum tensile strength. The yield strength is the amount of force a material can withstand before it begins to deform permanently, while the tensile strength is the maximum amount of force the material can withstand before it breaks.
The chemical composition of the EN10025-6 grades varies depending on the grade. For example, the S460Q grade contains 0.20-0.22% carbon, 1.60-1.90% manganese, 0.50-0.80% silicon, 0.025% phosphorus, 0.015% sulfur, and 0.15-0.41% niobium, as well as other elements. The S500Q grade has slightly different chemical composition, containing 0.20-0.22% carbon, 1.60-1.90% manganese, 0.50-0.8% silicon, 0.025% phosphorus, 0.015% sulfur, and 0.50-1.00% niobium.
The steel grades in the EN10025-6 standard are all weldable and can be cold-formed. The steel can also be used in a variety of heat treatments, such as quenching and tempering. This allows the steel to have a variety of mechanical properties, such as improved toughness, ductility, and strength. The different grades of EN10025-6 high strength structural steel can be used for a variety of applications, from bridges and buildings to oil and gas platforms. As a general rule, the higher the grade, the higher the strength. This means that the higher grades are more suitable for applications that require higher strength, such as bridges, while lower grades are more suitable for applications that require more ductility, such as buildings.