The seamless steel pipe is made by perforating the whole round steel, and the steel pipe without weld seam on the surface. It is mainly used as high-precision structural steel pipes for petrochemical industry, boiler pipes, automobiles and aviation.
Seamless tubing can be made from any of several alloys and metals, such as carbon steel, stainless steel, molybdenum, or tungsten. Seamless pipes are used in those industrial applications that require the highest safety requirements. To produce seamless steel pipes, the solid block is pierced with a piercing plug before the pipe is drawn to the desired size.
Some of the differences between seamless and welded pipes are:
Seamless pipes are extruded and drawn from billets, while welded pipes are produced from roll formed and welded strips.
Due to the higher range of security offered by seamless pipe, it is more expensive than welded pipe.
Seamless pipes are available in relatively short lengths, while welded pipes can be manufactured in longer continuous lengths.
Seamless pipe generally does not show any signs of corrosion until and unless it is subjected to a highly corrosive environment, whereas in welded pipe the welded area is more susceptible to corrosion attack.
The welded area is considered to be inhomogeneous, so it exhibits different ductility and lower corrosion resistance, as well as larger dimensional changes. Seamless pipes eliminate any such problems and thus offer high corrosion resistance.
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Dongfeng Motor disclosed on Thursday that the company was commissioned by Nissan Motors Co., Ltd. to develop the right-hand-operated series cab for Nissan and Renault F91G right-hand trucks on the basis of its body data. Nissan Motors Co., Ltd. will split three times. Pay development expenses of 55 million yuan.
According to the announcement, the results delivered by the company to Nissan Automobil Co., Ltd. include, but are not limited to, engineering drawings, standards, test results, research papers, and other engineering, technical, and commercial data.
Nissan Motors Co., Ltd., through its wholly-owned subsidiary Nissan (China) Investment Co., Ltd., holds a 50% stake in the company's controlling shareholder Dongfeng Motor Co., Ltd., and this transaction constitutes a related party transaction in accordance with relevant regulations.