Steel plate



"NSafe™-Hull" -Highly ductile steel plates developed by original chemical composition design

NSafe-Hull is a highly ductile steel plates in which the ductility has been improved by the optimum use of Nippon Steel’s original chemical composition design. When an impact force is applied to a ship, it is absorbed by denting of the plates themselves. In the NSafe-Hull, the capacity to absorb collision energy has been improved three times over that of conventional plates. The critical striking ship speed is twice that of conventional plates as well. Consequently the high ductility offered by NSafe-Hull can increase the period in which cracks and ruptures occur in plates.
For example, even if a crude oil tanker is in an accident, NSafe-Hull can prevent the oil spill into the sea. NSafe-Hull contributes toward safer and securer marine transport of tankers, cargo ships and other types of ships.


Nearly tripling the capacity of a ship to absorb collision energy and nearly doubling the critical striking ship speed for penetration* over conventional steel plates.

Study on ship collision has led to the development of NSafe-Hull, a new plate that is suitable for a wider range of applications, including cargo hold hull and fuel oil tanks. NSafe-Hull’s high ductility is achieved by the original chemical composition design and crystaline size-order microstructural control. Its workability (shearing, bending, welding and painting) is identical to those of conventional steels. The safety and security only NSafe-Hull provides is now available to users.

* Critical striking ship speed: The maximum speed at which penetration does not occur after collision


"NSafe™-Hull" -Penetrating rupture-free performance even in a 12-knot collision

The stated performance of NSafe-Hull has been proved by collision simulations at the National Maritime Research Institute, Japan. The simulation results demonstrate that the penetration does not occur in the inner hull of double-hull structure of a crude oil tanker employing NSafe-Hull in the case of the maximum strike speed of 12 knots. In the case of the bulk carrier with NSafe-Hull, simulation results confirmed that the penetration does not occur in the single hull structure at the maximum speed of 5 knots. NSafe-Hull is assessed to be a shipbuilding steel plate that can prevent oil spill that might otherwise cause huge environmental damages, as well as massive cargo discharge and even human injury. NSafe-Hull leadss another evolutionary step in the enhancement of maritime safety.

* Figures: Schematic image of simulation results

Absorbed Energy by Struck Ship, Normarised

Absorbed energy by struck ship, normalised by value of case with conventional steel.

Critical Striking Ship Speed for Penetration, Normarised

Critical striking ship speed for penetration, normalised by value of case with conventional steel

Expected Advantages of Highly Ductile Steel Plate (NSafe-Hull) as Structural Members
Application sections Members Advantages
Bulk carriers Cargo hold single hull sections Side shell plating
Hold frames
Side longitudinal frames
Prevention of flooded cargo holds
Protection of cargo
Prevention of penetration by loading machine grab impacts
Fuel oil tanks
(top-side tank sections)
Side shell platings
Top-side tank bottom platings
Fuel oil tank longitudinal bulkheads
Longitudinal stiffeners
Prevention of oil spill
Prevention of penetration by loading machine grab impacts
Fuel oil tanks
(engine room)
Side shell platings
Fuel tank longitudinal bulkheads
Prevention of oil spill
Application section Member Expected application advantage
Tankers Cargo hold hull sections Outer hull platings
Outer hull longitudinal stiffeners
Prevention of oil spill
Cargo hold inner hull sections Inner hull platings
Inner hull longitudinal stiffeners
Prevention of oil spill
Fuel oil tank
(engine room)
Hull platings
Fuel oil tank longitudinal bulkheads
Prevention of oil spill

Examples of use

Ship name: Orange Phoenix
Completion: Oct. 2014
Length: 299.94 m
Breadth: 50 m
Dead weight: 206,600 DWT


NSafe-Hull (1.74MB)PDFファイル

  • Highly Ductile Steel PlateーNSafe-HullーDebuts as an Advanced Shipbuilding Plate.
  • NIPPON STEEL Values Applicability of NSafe-Hull to a Wide Variety of Ships.
  • The Top Ship Brand with Evaluated Performance

Steel Plates (1.55MB)PDFファイル

  • Features
  • Available Grades
  • Authorized Steel Grades by Product Type
  • Manufacturing Process and Quality Control Points
  • Thermo-Mechanical Control Process (TMCP)
  • 400 N/mm2-class Tensile Strength Steel Plates (As-rolled) Available Sizes
  • 490 N/mm2-class Tensile Strength Steel Plates (As-rolled) Available Sizes
  • 490 N/mm2-class Tensile Strength Steel Plates (TMCP: Thermo-Mechanical Control Process) Available Sizes
  • Weldable High-tensile Strength Steel Plates: WEL-TENTM Series
  • Abrasion-resistant Steel Plates: ABREXTM Series
  • Abrasion-resistant Steel Plates for Low Temperatures: ABREXTM LT Series
  • Low-temperature Steel Plates: N-TUFTM Series
  • Sulfuric Acid-resisting Steel Plates: S-TENTM Series
  • Ni-Added Weathering Steel Plates: NAW-TENTM Series
  • Highly Corrosion-resisting Steel Plates: COR-TENTM Series
  • Corrosion-resistant Steel Plates for Export: COR-TENTM
  • High Tensile Steel Plates for Building Structures: BT–HT Series
  • Steel Plates for Elasto-plastic Hysteretic-type Dampers for Building Structures: BT-LYPTM
  • Electromagnetic Mild Steel Plates: NS–MIPTM
  • Information Required for Orders
  • Examples of Marking
  • Conclusions
  • Reference for Use of Steel Plates
  • Reference Tables of Standards
  • NIPPON STEEL Specifications Table of Correlations between Old and New Specifications

Contact Information

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