European Standard
Grade: C45
Plates Thickness: up to 150mm
Length: random lenght
EN C45 Plates Application examples include:
automotive parts such as crankshafts, axle shafts, steering components,
shafts in locomotive construction, shipbuilding and heavy engines
parts for machine tools and general mechanical engineering
turbine and generator shafts in power stations
components and accessories for the oil and gas industry
fastening elements such as high strength bolts
landing gear and control elements in aviation
tools in oil and gas exploration
Steel grades are selected to meet property requirements for a given application.
Demand of higher strength and toughness require increasing alloy content for improved hardenability:
Carbon content is systematically increased in unalloyed grades from 0.22% to 0.55%
Next are a series of 1% Chrome (Cr) and 1% Cr / 0.25% Mo grades with carbon content increasing again from 0.25% to 0.55%.
For higher stressed components CrNiMo steels are used with both nickel and chromium stepping up between 1% and 2%
In NiCrMo steels nickel is present up to 4% and Mo up to 0.7% to ensure through-hardening of components like generator shafts.
In CrMoV steels carbon is partly replaced by alloys - up to 0.9% Mo - to retain good weldability or extra high toughness.
Molybdenum’s most important role in these grades is to increase the hardenability and to promote a uniformly hardened microstructure across the full cross section.
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