High-strength structural steel plates offered in A572 Grade 50 (ASTM) and Q345 (GB) specifications. These plates are supplied in heavy plate form (typical thickness range 8–300 mm) and are intended for demanding engineering and structural applications where a balance of strength, weldability and toughness is required.
Key features
- A572 Grade 50: a low-alloy, columbium-vanadium high-strength structural steel plate with excellent weldability and good toughness for cold environments. Typical mechanical targets include a minimum yield strength around 345 MPa, tensile strength at or above ~450 MPa, minimum elongation (A) 18% (200 mm gauge) / 21% (50 mm gauge) and required impact performance (nominally ≥34 J depending on thickness and test temperature).
- Q345: a Chinese-designation structural steel with nominal yield strength around 345 MPa. Q345 is supplied in grades Q345A/B/C/D/E to meet different quality classes and low-temperature toughness requirements; typical tensile strength ranges and impact requirements are comparable to structural-grade plates used in buildings, bridges and heavy equipment.
Typical applications
- Building and bridge structures
- Construction and earth-moving machinery (excavators, loaders, bulldozers)
- Mining and heavy trucks
- Cranes, hydraulic supports and other load-bearing components
- Pressure-retaining structural elements where specified
Commercial details for procurement
When requesting quotations, specify: grade (A572Gr50 or Q345 and sub-grade), plate thickness and dimensions, required mechanical/impact properties and test certificates (e.g., mill test report), surface condition and any cutting or processing requirements, quantity and delivery terms. These steels are suited to welding and fabrication; supply forms and exact chemical/mechanical limits should be confirmed on order against the applicable ASTM/GB standard.
If you need a tailored quote, provide your specification and required delivery timeline through the marketplace RFQ channel.
