EN 10209 Grade HC300EK

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HC300EK is a cold rolled enamelling steel grade with guaranteed minimum yield strength that retains its mechanical properties after deformation and enamel firing. This grade can be used for both one-side and two-side enamelling.

The use of HC300EK grade enables steel thicknesses to be reduced whilst avoiding deformation of the parts after enamel firing. This grade can replace hot rolled steel in the manufacture of water heater tanks. After manufacture, parts like these are generally subjected to a cyclic fatigue test under pressure, during which they must not be deformed. The use of HC300EK grade thus makes it possible to reduce thicknesses to a lower level than is possible with hot rolled steel.

Related Standards

This material data has been provided by ArcelorMittal.

"Typical" values were obtained via a literature search. "Predicted" values were imputed via artificial intelligence technology. While we have placed significant efforts in ensuring data accuracy, "typical" and "predicted" data should be considered indicative and verified by appropriate material testing. Please do contact us if additional information on the the predicted data method is required.
All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.

Ashby charts





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20 %

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Tensile strength

360 - 480 MPa

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As delivered

Yield strength

280 - 380 MPa

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As delivered | The guaranteed minimum yield strength after 5% deformation and enamel firing is 300 MPa

Chemical properties



0.075 %

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0.5 %

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0.006 %

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0.075 %

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0.5 %

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0.025 %

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Technological properties

Application areas

HC300EK grade is particularly suitable for the manufacture of water heater tanks. It can also be used for flat parts for household items (dripping pans, baking trays) and shower trays or for manufacturing architectural panels for building interiors or exteriors.

Chemical composition

The manufacturing conditions guarantee very good resistance to “fish scale” defects (TH > 100 in accordance with EN 10209).



Surface treatment:

The parts must be degreased before enamelling. When enamel containing a low level of adhesion oxides is used (e.g. water heater tank using Ni-free enamel), sand blasting or pickling may be necessary.

Enamel application and firing:

HC300EK grade is compatible with all the common enamelling processes: wet spraying, electrostatic liquid or powder enamelling. Both ground and conventional enamelling processes are feasible.

Where wet application is used, it is imperative to dry the enamel layer before firing.

Enamel firing is carried out at 830°C.


HC300EK grade can easily be welded, whatever the welding process may be. Other joining processes (clinching, crimping) may also be used.

Processing methods

HC300EK grade can be formed by bending, profiling or light drawing.