ASTM S690QL High Strength Hot Rolled Alloy Plates

ASTM S690QL High Strength Hot Rolled Alloy Plates

ASTM S690QL High Strength Steel Plates are thermomechanically rolled, quenched, and tempered alloy steel plates known for their high yield strength (minimum 690 MPa), toughness, and exceptional weldability. These plates are specifically engineered for use in critical structural applications where both strength and weight savings are essential, such as in cranes, bridges, heavy vehicles, and offshore structures.

Manufacturing Excellence:

Diamond Alloys is a trusted manufacturer, supplier, and exporter of ASTM S690QL high-strength plates, delivering top-tier materials that conform to international quality benchmarks. The manufacturing process incorporates hot rolling followed by quenching and tempering (Q+T), ensuring optimal strength, durability, and surface uniformity.

Rigorous Testing Protocols:

To maintain quality consistency and meet client specifications, each plate undergoes a comprehensive testing process. This includes ultrasonic testing (UT), tensile strength evaluation, hardness testing, chemical composition analysis, Charpy impact testing, flattening and flaring tests, macro and microstructural examinations, and Positive Material Identification (PMI). All tests are supervised by trained quality professionals.

Certifications Provided:

Diamond Alloys supplies complete certification documents with each order to verify material properties. These include EN 10204 3.1/3.2 certification, third-party inspection reports, ultrasonic test results, mechanical property charts, and chemical composition certificates for full traceability and client assurance.

Shipping Documentation:

Accurate and complete documentation accompanies every dispatch. This includes heat treatment records, quality assurance plans (QAP), commercial invoices, material test certificates, fumigation clearance (if required), packing lists, and guarantee letters for complete shipment transparency.

Packaging & Product Identification:

To ensure safe delivery and prevent surface damage during transit, plates are securely packed using waterproof wrapping, wooden pallets, or steel-bound crates. Each plate is clearly labeled with grade, size, heat number, batch number, and manufacturer’s mark for seamless product tracking and inventory control.

Definition Recap:

S690QL plates are high-strength quenched and tempered structural steel plates with excellent formability, weldability, and impact toughness at low temperatures. Designed to provide superior load-bearing performance with reduced structural weight, they are widely used in demanding applications across heavy machinery, mining, construction, and offshore industries.