Foundry and Development of Ductile Iron Crankshaft

Song Liu*
Institute of Continuing Education, Chongqing College of Electronic Engineering, 401331, Chongqing, China.

© 2015 Song Liu

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: ( This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.


In this paper, we introduce the production of ductile iron crankshaft of the engine status quo and development. Ductile iron crankshaft discussed smelting process, alloying and manufacturing process mode. This paper focuses on the application of isothermal hardened spheroidal graphite cast iron in the crankshaft, especially its application in the power of the engine crankshaft. We also introduce a way for casting production technique of high strength-high toughness nodular iron crankshaft. In order to increase the strength, toughness of the nodular iron crankshaft and improve casting quality, a series of investigations were carried out on the mini-amount alloying technique, control technique of iron melt eutectic point, nodularizing treating technique, curved parting method and the structure normalization process and, as the result, the high-strength and high toughness nodular iron crankshaft was successfully developed. The tensile strength of the crankshaft was increased from original 872 MPa to 927 MPa.

Keywords: Crankshaft, development, high strength, high toughness, spheroidal graphite iron.