MARILOY™ S-400 Pipes

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Nippon Steel's MARILOY™ S-400 steel pipe is a steel product containing 1% chromium for enhanced corrosion resistance when used in or on the ocean. The origin of the word MARILOY comes from a combination of MARINE and ALLOY.
The addition of chromium produces an effect in which the rust layer on the surface prevents oxygen from infiltrating the base metal, thus inhibiting corrosion to half or less compared to ordinary steel. MARILOY™ S-400 steel pipes are mainly used for the cargo oil pipes in oil tankers, FPSO systems and water ballast pipes. Since its release about 25 years ago, more than 60,000 tons of MARILOY™ S-400 has been used, reflecting highly-valued efficiency of this product.

Features

  1. 1Chemical composition

    1%Cr

  2. 2Mechanical properties

    TS=400MPa, on the same level as carbon steels

  3. 3Weldability

    Similar to carbon steels.
    No preheating is required.

  4. 4Corrosion resistance

    Corrosion rate is half that of carbon steel in seawater(The diffusion rate of oxygen is slower in rust layers containing Cr compared to those that do not.)

Corrosion in Seawater-Gas Heat Exchanger Tubes
Corrosion loss of MARILOY™ S-400 is half that of carbon steel (SS400).

MARILOY™ Pipes Reduce Fabrication and Maintenance Costs

MARILOY™ Reduces Fabrication Costs

Coated carbon steel pipes Flange Ship : measure the length → Shop : cut, angle-weld and paint → Ship : joint with bolts
MARILOY™ pipes without inner surface coating Welding Sleeve Flange Ship : cut and weld Merit: Fabrication cost and time can be reduced.

MARILOY™ Reduces Maintenance Costs

Coated carbon steel pipes After a long-time service Cargo oil pipe Water ballast pipe Inner surface:Coating is sometimes damaged within several years, which can lead to local corrosion. Several repairs and/or replacement of pipes may be necessary during the ship's life. An example of damage to the tar epoxy coatin Blister →Breakage Local corrosion: 5 - 7mm/12.5years→Local repair
MARILOY™ pipes without inner surface coating After a long-time service Cargo oil pipe Inner surface:small pits ater ballast pipe nner surface:general corrosion MARILOY™ pipes are estimated to have a usable life of more than 30 years. General corrosion: 3mm/15 years→No need to repair

Supply Records of MARILOY™ S-400 Pipes

  1. 1Shipbuilding companies

    JAPAN MARINE UNITED CORPORATION SUMITOMO HEAVY INDUSTRIES, LTD.
    KAWASAKI HEAVY INDUSTRIES, LTD., NAMURA SHIPBUILDING CO., LTD. BOHAI SHIPBUILDING HEAVY INDUSTRY CO., LTD.
    NANTONG COSCO KHI SHIP ENGINEERING CO., LTD.
    HYUNDAI HEAVY INDUSTRIES CO,. LTD.
    DAEWOO SHIPBUILDING & MARINE ENGINEERING CO., LTD
    JURONG SHIPYARD PTE LTD, KEPPEL SHIPYARD LIMITED ···etc.

  2. 2 Ship-owners

    NIPPON YUSEN KABUSHIKI KAISHA, MITSUI O.S.K. LINES, LTD. KAWASAKI KISEN KAISHA, LTD., KYOEI TANKER CO., LTD.
    IDEMITSU TANKER CO., LTD., NS UNITED KAIUN KAISHA, LTD.
    JX OCEAN.,LTD., BW VLCC, FORMOSA PLASTICS CORPORATION, U.S.A.
    PETROBRAS, DSD SHIPPING AS, TSAKOS SHIPPING (LONDON) LTD. PLEIADES SHIPPING AGENTS S.A., DALIAN OCEAN SHIPPING COMPANY MODEC. INC ···etc.

  3. 3Type of ship, use

    VLCC(Cargo Oil pipes, Water ballast pipes), Bulk Carrier(Water ballast pipes) FPSO

Catalog

MARILOY™ S-400 Pipes, 1% Cr Steel for Cargo Oil and Water Ballast Pipes[PDF:6.54MB]
Pipes & Tubes[PDF:20.50MB]

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