Nippon Steel & Living Co., Ltd. is the first in the world to develop a new high-efficiency corrosion-resistant steel plate NSGP-1 (Environment No. 1) with a quality grade of AH32. The steel plate is mainly used for crude oil carriers and giant oil tankers. Compared with the traditional steel plate, the corrosion resistance of the steel plate is about 5 times that of the original steel plate, which can save the coating process for preventing corrosion, improve the safety and environmental protection of the ship, and apply the welding and processing of the steel plate. It is identical to traditional steel and requires no special construction management during construction.
It is reported that in order to verify the corrosion resistance of the new steel plate, the former Nippon Steel cooperated with Nippon Yusen to use the corrosion-resistant steel plate on the bottom plate of the large oil tanker (MLCC) "Takamine" built by Mitsubishi Heavy Industries in 2004, passing 2.5 years. The actual ship test showed that the new steel plate can effectively prevent corrosion. The maximum corrosion pit of the NSGP-1 steel plate is only 2.8 mm, while the corrosion depth of the conventional steel plate is 6.3 mm. According to international practice, the hull needs to be repainted if the corrosion pit exceeds 4mm, and welding repair is required if it exceeds 7mm. In addition, NYK used 15 tankers for testing, 6 of which used NSGP-1 steel plates. The test results show that the corrosion rate of NSGP-1 is only 1/5 of that of conventional steel plates. NSGP-1 has been officially accepted for ordering in Japan since 2007. By 2011, it has been applied to the construction of six oil tankers. It has been six years since the longest flight, and no corrosion has been found. It is confirmed that NSGP-1 steel has Good corrosion resistance.
Nippon Steel lives in SMICORE. The high-corrosion-resistant thick plate SMICORE is used on the upper deck and bottom plate of the tanker crude oil tank developed by Sumitomo Metal. The toughness grade is DH32 and the thickness specification is 16.5mm. The mechanical properties, weldability and welded joint properties of the steel sheet are comparable to those of conventional thick plates for crude oil tanks, and corrosion resistance is better. In August 2005, SMICORE was tested on tanks No. 2 and No. 3 of the SANKOBLOSSOM tanker. After two years and nine months of sailing, the SANKO BLOSSOM tanker conducted the first dock inspection. The inspection results show that the reduction of the thickness of the steel plate on the upper deck of the crude oil tank is about 60% of the thickness reduction of the traditional steel plate; in the bottom plate part, there is no pitting corrosion exceeding 2 mm in depth, and the pitting corrosion of the steel plate of the crude oil tank bottom plate No. 2 The depth is about 1/4 of the pitting depth of the traditional steel plate, and the pitting depth of the steel plate of the No. 3 crude oil tank is about 60% of the pitting depth of the conventional steel plate. The corrosion resistance of SMICORE applied to the upper deck and bottom plate of the crude oil tank was confirmed.
JFE's JFE-SIP-OT. JFE's typical grade for corrosion-resistant ship plates for crude oil carriers is DH36 grade JFE-SIP-OT with a thickness specification of up to 25 mm. The JFE-SIP-OT steel composition design is based on the experimental study on the corrosion mechanism of the crude oil tank. The corrosion rate of the steel in the corrosive environment of the crude oil warehouse is only 1/7 of that of the conventional steel plate, and the corrosion resistance of the painted steel plate can be improved. The test shows that the pitting corrosion depth of the JFE-SIP-OT painted steel plate is only the conventional coating. 65% of the paint steel plate. JFE cooperated with Mitsui Merchant Marine to apply the corrosion-resistant steel to the floor and upper deck of the VLCC ship built by Ishikawa Iwhama (IHI) at the end of 2007.
Kobe Steel's crude oil ship corrosion resistant steel. Kobe Steel has developed corrosion-resistant ship plates for AH32 crude oil carriers. Aiming at the main corrosion factors of crude oil in crude oil and crude oil containing low pH chloride solution, the corresponding alloying elements are added to the developed steel and the composition is optimized to make the surface of the steel in the corrosive environment of crude oil. The corrosion product becomes a stable protective film, preventing S from coming into contact with the steel substrate and suppressing the corrosion reaction. In addition, the composition of the steel can also increase the pH of the liquid in the pitting corrosion pit, slow down the reaction rate of the cathode, and suppress the pitting corrosion. Tests have shown that the corrosion rate of corrosion-resistant marine steel developed by Kobe is only 1/4 of that of conventional steel under S corrosion, and the pitting corrosion rate of low-pH chloride solution is only 1/5 of that of conventional steel.
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