Kobe Kobe Steel certified for stronger crankshafts

Stronger and more compact crankshafts will enable more efficient two-stroke engine design Stronger and more compact crankshafts will enable more efficient two-stroke engine design
Industry Database

Kobe Steel will be able to build smaller, stronger crankshafts after receiving certification from ClassNK to use greater design margins in the manufacture of crank components.

The factor K is used in the calculation of the fatigue strength of steel components. Kobe was previously approved to a K-factor of 1.05, but the latest certification from ClassNK raises that to 1.15 – indicating a design margin of 15%.

Kobe said that the increased design margin is a result of proprietary refining techniques that minimise impurities in the steel, as well as a die-forging process that creates a stronger throw compared to the bending technique normally used.

The company noted that ship owners face increasing demands on engine room space from emissions abatement technology and bigger engines. “As a result, the need is growing for more compact engines to improve fuel efficiency and secure more cargo space,” it suggested.

The company claims that a crankshaft designed to bear higher loads could improve power output as much as adding an extra cylinder, contributing to the design of more compact, efficient engines.

Kobe Steel is planning to explore possibilities for weight and space savings with engine makers and ship builders.

The certification applies to cranks for built-up, rather than solid, crankshafts. This type of crankshaft is most often used in larger engines.

Latest Jobs

Chief Engineer, London

SVITZER is the largest global company within towage and related services. We employ over 4000 employ... Read more

Cargo Inspector

To perform volume/ temperature measurements, sampling, calculations, and reporting to ensure that th... Read more

Marine Systems Support Engineer

Would you like to work in an exciting and pivotal role within the Maritime Services business functio... Read more

Marine Engineer Technical Consultant and Surveyor

Exponent is a leading engineering and scientific consulting firm. Read more


We are looking for an experienced and talented Digital Marketing Executive to join our award winning... Read more

Media Sales Executive

We are looking for an experienced Sales Executive to join our award winning B2B media company. Merc... Read more

View all jobs