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An Approach to Increase Strength of Materials for Built-up Type Crankshafts

机译：An Approach to Increase Strength of Materials for Built-up Type Crankshafts

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摘要

Recently, there is an increasing need for improving the efficiency of low-speed diesel engines for ships. In response, Kobe Steel has newly developed an inexpensive low-alloyed steel for semi-built-up type crankshafts. This steel has a high yield point and high fatigue strength while avoiding the risk of quench cracking, which often occurs in large, forged steel products. Crank throws were manufactured from multiple steel types, including the newly developed steel, and the material properties of samples of steel pieces taken from their major parts were evaluated. The results confirmed that the newly developed steel has mechanical properties and a fatigue strength superior to those of conventional steel. It is expected that this newly developed steel will be applied to next generation engines and contribute to compliance with environmental regulations, which are expected to become increasingly stringent.

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