NK Hull Structure Plate

NK Hull Structure Plate is manufactured for shipbuilding and offshore structural applications requiring compliance with ClassNK (Nippon Kaiji Kyokai) classification requirements. Available in both normal-strength and high-strength grades, these steel plates are suitable for hull structures, decks, bulkheads, bottoms, and other primary load-bearing components.

CTL&SL

Grinding Polishing

Cutting

Beveling

Forming

Maching

Auto Welding

Heat treatment

Painting

Engineering Services

NK Standard Marine Steel Plate Mechanical Property

The Grades Of NK Standard Ship Plates We Can Provide Include

Equivalent Grades CoMParison

Refined through LF and VD vacuum degassing processes to keep S and P impurities low, helping prevent internal defects and laminations.

Controlled carbon equivalent (Ceq ≤ 0.38%) via TMCP processing provides consistent weldability and helps reduce preheating requirements during shipyard fabrication.

Offers verified Charpy V-Notch impact energy at temperatures down to -40℃ to maintain structural integrity in cold water conditions.

Advanced S-reduction and Ca-treatment deliver Z-direction performance (Z15/Z25/Z35) to prevent lamellar tearing in thick joints (≥25 mm) per ClassNK and ASTM A770.

Commercial Shipbuilding: Shell plating, strength decks, bottom structures, and side framing for bulk carriers, tankers, and container ships.

Offshore Engineering: Hull structures for FPSO, offshore platform jacket legs, and support pontoon structures.

Specialized Vessels: Ice-strengthened hulls and low-temperature storage barges using Grade E / EH Impact-tested plates.

Beveling & Edge Preparation: Factory-performed V, K, or X-shape bevel cutting to expedite on-site shipyard welding.

Custom Cutting & Profiling: Precision CNC flame and plasma cutting according to client structural CAD drawings.

Surface Pre-treatment: Automated SA 2.5 shot blasting combined with weldable shop priming (15–25 μm thickness).

100% Non-Destructive Testing (NDT): Every plate undergoes ultrasonic testing (UT) in accordance with ASTM A578 Level B/C or ClassNK rules to ensure internal sound structure.

Physical Traceability: Hard-stamped with the ClassNK emblem, Heat Number, Plate Number, and Grade on the edge, matching 100% with the official EN 10204 3.2 Mill Test Certificate.

Steelmaking & Refining: Processed via 120T converter, Ladle Furnace (LF), and Vacuum Degassing (VD) to strictly control sulfur and phosphorus levels.

Rolling & Cooling: Utilizes a heavy plate rolling mill equipped with an Automated Accelerated Cooling (ACC) system to ensure uniform microstructural grain refinement and consistent mechanical performance.

Corrosion Protection: VCI anti-rust oil film, waterproof plastic wrapping, and edge protectors applied prior to sea freight.

Bundling & Securing: Heavy-duty steel straps with timber dunnage to prevent inter-plate friction during transit.

Flexible Marine Logistics: Containerized loading for standard sizes (under 11.8m) or breakbulk/RO-RO vessels for extra-wide and long plates.

Hot Tags: nk hull structure plate, China nk hull structure plate manufacturers, suppliers, factory