Sheet Steel Q550C/D/E
General Technical Characteristics
Sheet steel grades Q550C, Q550D, and Q550E are high-strength low-alloy structural steels produced in accordance with the GB/T 1591 standard. These grades offer a high yield strength of at least 550 MPa, excellent weldability, and strong resistance to dynamic loads.
The main difference between the grades lies in impact toughness and testing temperature:
- Q550C — tested at 0°C
- Q550D — tested at -20°C
- Q550E — tested at -40°C
The steel is supplied in plate form with thicknesses typically ranging from 6 mm up to 100 mm and more.
Chemical Composition and Mechanical Properties
Q550C/D/E steel features an alloyed chemical composition including carbon (C), manganese (Mn), silicon (Si), and microalloying elements such as niobium (Nb), vanadium (V), titanium (Ti), and others.
This composition provides:
- high strength
- good ductility
- excellent weldability
Mechanical properties:
- yield strength: ≥ 550 MPa
- tensile strength: ~650–800 MPa
- high impact toughness at low temperatures
- resistance to deformation and heavy loads
Applications
Q550C/D/E sheet steel is widely used in demanding applications across multiple industries:
- structural steel construction
- bridge engineering
- machinery manufacturing
- cranes and heavy equipment production
- energy and infrastructure projects
It is ideal for critical welded structures operating under high loads and low-temperature conditions.
Features
Key advantages of Q550 steel:
- higher strength compared to Q460 grades
- potential for weight reduction in structures
- good weldability without complex procedures
- resistance to brittle fracture (especially Q550D/E)
- reliable performance in cold climates
Standards and Supply Formats
Q550C/D/E steel is produced according to the GB/T 1591 standard, with possible equivalents in EN and ASTM specifications.
Supply formats:
- standard size plates
- cut-to-size services
- plasma and oxy-fuel cutting
- custom parts based on drawings
- optional machining services
Order Q550 Steel Today!
If you need high-strength sheet steel for demanding and critical applications, choose Q550C, Q550D, or Q550E.
Contact us today to purchase high-quality steel plates at competitive prices with fast delivery and guaranteed performance!
