AH36 Marine Steel Plate for Offshore Structures | High Strength Grade

Manufacturing Process & Quality Assurance

Raw Material & Steelmaking

The process begins with select iron ore and scrap metal, melted in advanced furnaces. Through precise secondary refining, the chemical composition—including carbon, manganese, silicon, and micro-alloying elements—is carefully adjusted to lay the precise foundation for AH36's required strength and toughness.

Hot Rolling & Forming

The continuously cast steel slab is reheated and passed through a series of rolling mills. Under high temperature, it is progressively rolled to the specified thickness. This hot-rolling process not only shapes the plate but also refines the internal grain structure of the steel, initiating the development of its mechanical properties.

Normalizing Heat Treatment (Critical Stage)

For AH36 plates, the Normalizing heat treatment is a pivotal stage. The rolled plate is reheated to approximately 900°C, held until uniformly heated, and then allowed to cool in still air.
Grain Refinement: Eliminates internal stresses and uneven microstructure from hot rolling, resulting in a fine and uniform grain structure.
Property Optimization: Significantly enhances the overall mechanical properties, particularly low-temperature impact toughness. This ensures resistance to brittle fracture in harsh environments like frigid waters, while maintaining good strength and weldability.

Finishing, Inspection & Certification

Finally, the plate undergoes precision leveling, cutting, and surface inspection. Every batch is subjected to rigorous destructive and non-destructive testing to verify compliance with the specified standards.