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 Chemical composition

1%Cr

② Mechanical properties

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

③ Weldability

Similar to carbon steels.

No preheating is required.

④ Corrosion 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.)

MARILOY™ Pipes Reduce Fabrication and Maintenance Costs

MARILOY™ Reduces Fabrication Costs

MARILOY™ Reduces Maintenance Costs

Supply Records of MARILOY™ S-400 Pipes

① Shipbuilding 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 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 Type of ship, use

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