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Nippon Steel produced and marketed; Strong and user-friendly steel plate for constructions and building structures, Steel plate for strong and tough bridges, Railway wheels which are extensively adopted in railway operations worldwide etc.
Bridges/ Civil Engineering
- Weathering steel COR-TEN™Bridge
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Weathering steel can be used without coating. Eliminating the need for a coating coat including re-coating contributes to reduction in life-cycle cost. The feature is "to prevent rust," which is the weakest point of iron due to "rust." At first, rust is generated similarly to normal steel, but dense protective rust is eventually formed on the surface with the function of alloy elements. In this way, progress of rust is controlled. An esthetic effect whereby the subdued color of protective rust matches the scenery in Japan and that it is loved as a local landmark may be expected.
- Nickel-based weathering steel NAW-TEN™Bridge
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For bridges using weathering steel, reduction in life-cycle cost is evaluated and it accounts for about 30% compared to steel bridges. However, salt environments adversely affect weathering steel, limiting its use. NSSMC has developed its original high-weathering steel NAW-TEN™, which showed improved salt damage resistance better than general weathering steel by addition of nickel. This technology received the Ichimura Industrial Award and the Contribution Award in FY1999 and received the Monozukuri Nippon Grand Award, Excellence Prize in FY2009.
- CORSPACETMBridge
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A steel pipe sheet pile attaching the pipe joint to a steel pipe pile is continuously built in a closed shape like a circle at the site. It integrally behaves as a steel well foundation and high horizontal resistance/vertical support force can be obtained. In construction, it can also be used as temporary coffering and is excellent in economy.
- Higher yield strength steel plates SBHS for birdgesSteel gider
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Since the strength, which is a design criterion, is improved by 23% maximum compared to conventional steel, economical design/construction due to its light weight can be performed. The feature is high strength allowing for high weldability. Preheating can be omitted or reduced in welding. It was used for the Tokyo Gate Bridge, the world-first large full-weld truss-box compound bridge, and it greatly contributed to efficient welding, quality improvement, and work environment improvement.
- Lean Duplex Stainless Steel (NSSC2120™ and SUS323L)Ports and rivers
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This is a new type of stainless steel optimum for measures against tsunamis and water control measures such as dams, floodgates, and gates. The two-phase metallographic structure has achieved strength approximately twice that of the conventional type (SUS304). This is resource-saving stainless steel with less Ni and other alloy elements while its corrosion resistance is higher.
- Cable wireCable
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With rolling-process inline-type molten salt bath heat treatment (DLP), LP treatment of wires is omitted. Steel material with a low environmental load was developed with no lead and reduction in CO2 emissions, and the world's highest strength of 2.0 GPa class was also achieved.
Construction
- BT-HT series (high-tensile steel plates for building construction)Column
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The BT-HT series is high-tensile steel for which the yield point does not decrease even for thick products. Most types are manufactured by applying the thermo mechanical control process (TMCP). The high-tensile steel with excellent weldability has been applied to various buildings.
- High HAZ toughness steel (HTUFF™) (for large heat input welding for building construction)Column
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As the size of buildings increases (higher-rise and larger span), the strength and the cross section of steel materials for steel frames need to be increased. High HAZ toughness steel (HTUFF™) for building construction can be processed by large heat input welding that is required to increase the strength and the cross section. The steel can secure the performance at welds and can improve the welding efficiency at the same time.
- COR-TEN™Surface designed material
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Weathering Steel COR-TEN™ can overcome atmospheric corrosion by using it to form a protective layer on its surface.
Note: COR-TEN is a registered trademark of United States Steel Corp.
Railways
- Wheel
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The speed of high-speed trains exceeds 300 km/h. Subways or city trains have increased the requirements for acceleration and braking. Operating conditions of the wheel are becoming increasingly harsh. NSSMC's wheel has the world's highest-level cleanliness from its excellent steelmaking technology. Consistent quality control is performed by highly advanced hot-rolled forming, processing, and inspection technology. It has obtained customers' trust together with a long-standing record. We are providing overseas countries as well as Japan with high-quality and high-value-added wheels.
- Brake disc
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It has been used for all Shinkansen cars. In the development of the forged steel brake disc with fin for the Shinkansen, we received an award from the Japan Society of Mechanical Engineers. In addition, the newly developed center-fastening brake disc was used for N700A, which started operation on February 8, 2013. If a hazard is detected, it enables quicker stop and stable and strong braking force. It has been successful in weight reduction by 20% or more compared to conventional products, it contributes to energy saving, and it improves riding comfort.
- Axle
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The axle is one of the most important parts in safety together with the wheels out of parts consisting of wheels and axle. We started manufacturing axles in 1916. Then, along with the high speed of trains, the operating conditions are harsh and we developed an induction hardening axle with extremely high safety. It has been widely used for high-speed/high-load trains including the Shinkansen. Moreover, we have developed a hollow axle to reduce unsprung weight and greatly contributed to improvement of energy saving and riding comfort.
- Drive unit (gear)
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The unit that transfers the power of the motor, etc. to the wheel through gears. NSSMC's drive unit has been used for many trains including high-speed trains like the Shinkansen. The drive unit for high speed has achieved about 10% weight reduction using aluminum alloy for the gear case. Also, we will implement the development of a drive unit meeting low noise requirements, using a design with highly advanced gear analysis technology and high-speed load-testing facilities under an anechoic environment.
- Steering truck
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NSSMC developed a steering truck together with customers to reduce slip between the wheel and the rail at curves. It enables smoother operation on a curve than a normal truck with automatic steering of the axle in passing a curve so that the automobile is steered along with the curve, and squeaking noise is controlled.
- PQ monitoring truck
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A PQ monitoring truck jointly developed by NSSMC, Sumitomo Metal Technology Inc., Tokyo Metro Co., Ltd. and National Traffic Safety and Environment Laboratory enabled measurement of the derailment coefficient during commercial operation for the first time in the world. The derailment coefficient is changed by lubrication between the wheel and the rail, surface condition, temperature, or humidity. The PQ monitoring truck is useful for maintenance and it contributes to further improvement of safety by monitoring the track and analyzing any changes to it.
- Rail
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The heaviest and the highest-quality rail with a weight of 60 kg per meter is used for Shinkansen rails, and strength and durability are ensured. When the 300km/h operation starts, high accuracy of +-0.3 mm or less for the rail irregularity tolerance is required. NSSMC achieved highly accurate quality control by introducing a shape inspection system using laser and it supports safe, high-speed operation of the Shinkansen.
