S550QL 1.8926 steel Chemical composition and equivalent

S550QL Structural Steel Chemical Composition

S550QL steel is a structural steel grade with a minimum yield strength of 550 MPa intended for structural applications requiring extra strength and toughness. It is a low-alloyed steel with high yield strength and good weldability properties. The chemical composition of S550QL steel is comprised of the following elements:

• Carbon – 0.22% • Silicon – 0.60% • Manganese – 1.60% • Phosphorus – 0.025% • Sulfur – 0.010% • Chromium – 0.9% • Molybdenum – 0.5% • Nickel – 0.6% • Vanadium – 0.2% • Copper – 0.3%

Mechanical Properties

S550QL steel is used for applications requiring a high strength-to-weight ratio, like heavy machinery and construction. The steel has a minimum yield strength of 550 MPa, a tensile strength of 640 to 770 MPa, and a toughness index of 10. The steel also has an elongation at fracture of 16%.

EN10025-6 S550QL Steel Equivalent Grades

The equivalent grades of S550QL steel are S550MC, S550Q, S600Q and S690Q.

S550QL high-strength quenched and tempered steel grade produced in compliance with EN 10025-6. It is a structural steel grade with a minimum yield strength of 550 MPa intended for structural applications requiring extra strength and toughness. The chemical composition of S550QL steel is comprised of carbon, silicon, manganese, phosphorus, sulfur, chromium, molybdenum, nickel, vanadium, and copper. The steel is used for applications requiring a high strength-to-weight ratio, like heavy machinery and construction. The equivalent grades of S550QL steel are S550MC, S550Q, S600Q and S690Q.

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