Tungsten Alloy Improves Crankshaft Performance

It is reported that the longest and the heaviest single Manen 7G80ME-C series full-stroke crankshaft was spring successfully off the assembly line in Dalian on Aug. 29, and its batch production will be implemented. Since Aug. 2006, Dalian Heavy Industries produced the first 500 marine crankshafts.

That crankshaft produced by Dali Heavy Industry is the world's longest full-stroke crankshaft with total length 12.575 m, full stroke 3.72 m, diameter rotating 4.74 m and weight 237.131 tons. It would be assembled in Dali low-speed marine diesel with more than 40,000 horsepower, and its diesel engine applied to a tanker weighted 319,000 dwt built by Dalian Shipbuilding Industry. Only three foreign companies had this type crankshaft machining capacity in the past.

Dali Heavy Industry has tackled seven national issues, and has a complete control of the most high-end marine crankshaft production technology, also completely broke long-term monopoly of Chinese shipbuilding as the foreign large-scale low-speed of the marine crankshafts. A world-class research and development base of the crankshaft is becoming.

Working as a significant component of marine diesel engines, high properties such as heavy weight, size accuracy, high performance, well machinability are required badly for the crankshaft features. Many studies and practices shows that tungsten alloy should be most proper material, which is superior to steel for crankshaft, as it is high density, i.e. its heavy dense. That’s to say, if you need the same weight, then the volume should be saved if you choose tungsten alloy for the crankshaft, then the assemble volume would be saved. Therefore, tungsten alloy becomes the most competitive material for crankshaft performance improvement.

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