Steel plate


High-tensile / Excellent Quality HAZ Toughness Plate

  • The needs of high tensile steel are growing up as the size of facility increases.
  • NIPPON STEEL has wide range Pre-Qualification material with high toughness for offshore structure using advanced technology.
  • NIPPON STEEL has supplied offshore structural steel for various projects all over the world.
  • NIPPON STEEL has applied the TMCP(*1) process to offshore structural high tensile steel with excellent weldability and HAZ(*2) toughness for the first time in the world.
    (*1:Thermo Mechanical Control Process. *2:Heat Affected Zone)
  • The shift to high tensile steel leads the reduction in the size and weight of steel structure. As the result, it is possible to reduce “Distribution and installation cost” while mounting equipment.


  • Excellent TMCP technology
  • Improvement of HAZ toughness
  • Good weldability
  • World-class product lineup

Benefits of use

  • Compatible with the needs in place for high strength structures
    In addition to Gr50 and Gr60 steel plates specified by API standards, we have newly developed Gr80 steel plates, being the first in the world to put it into practical use.
  • Weight reductions
    Allows for capacity in TOPSIDE-loaded equipment.

Improvement of HAZ toughness technology

Basic concept

Metallurgical factors Measures
Refinement of
effective grain size
  • Inhibition of austenite grain coarsening by fine particles such as TiN
  • Utilization of intra granular ferrite (IGF) nucleated from particles such as Ti2O3
  • Utilization of both the above measures by dispersing high–temperature–stable oxide and sulfide particles
Decrease of MA–constituents
  • Reduction in carbon content and carbon equivalent
  • Reduction in silicon, alminium and niobium content
Improvement of matrix toughness
  • Fixation of free nitrogen such as TiN, AlN, etc.
  • Addition of nickel

Concept of HTUFFTM steel

Concept of controlling microstructure

WM: Weld Metal FL:Fusion Line γ:Austenite GBF:Grain Boundary Ferrite FSP:Ferrite Side Plate IGF:Intra-granular Ferrite Bu:Upper Bainite


Steel Plates for Offshore Structures (7.09MB)PDFファイル

  • Steel Plates for Offshore Structures
  • Product Range
  • Manufacturing Process and Quality Control Points
    • Thermo–Mechanical Control Process(TMCP)
  • Improvement of HAZ Toughness
  • Primary Steel with Pre–Production Qualification
    • Grade 50~80 (YS355~550MPa)
    • Grade 100 (YS690MPa)
  • Welding Materials

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

Solution for Offshore Oil and Gas (14.1 MB)PDFファイル

  • Promote technology development -key driver for innovation
  • Global Supply Network (Steel Plates, Pipe and Tubes, Spiral-weld Pipes)
  • Supply Record for TLP's
  • The power of Group to comprehensive that are a NIPPON STEEL provide solutions level above
  • Provision of high-performance items for all products, from those used for development, to production and transport
  • Bases in Japan
  • Overseas Offices and Branches
  • High-tensile / Excellent Quality HAZ Toughness Plate
  • TMCP-type Steel Plates for LNG Storage Tanks A841Gr-G (Ni Reduction of Over 20%)
  • S-TENTM1
  • NIPPON STEEL's High Grade H-Shapes
  • High Tensile Wire Rod for Rope
  • Resin Coated Flat Wire for Extra Flexibility
  • Welding Consumables for Offshore
  • Superiority of Seamless Flux Cored Wires (NSWE's SFW)
  • NIPPON STEEL's Duplex Stainless Steel Seamless Pipe & Tube
  • NIPPON STEEL's Corrosion Resistant Alloy Seamless Pipe & Tube

Contact Information

For further product information

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