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.


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.

Recommendations for use



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




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




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.

Brand correspondence



Thickness (mm)Min widthHC300EK
Max width
0.50 ≤ th < 0.806001460
0.80 ≤ th < 1.601680
1.60 ≤ th < 2.001365

Mechanical properties

Mechanical properties as delivered.


 Re (MPa)Rm (MPa)E (%)
HC300EK280/380360/480> 20


The guaranteed minimum yield strength after 5% deformation and enamel firing is 300 MPa.

Chemical composition

C (%)
Mn (%)
P (%)
S (%)
Si (%)
N (%)
HC300EK ≤ 0.075 ≤ 0.5 ≤ 0.075 ≤ 0.025 ≤ 0.500 ≤ 0.006

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

For commercial information (quotations, deliveries, product availability):

For technical questions about these products:

All details provided in the ArcelorMittal Flat Carbon Europe S.A. catalogue are for information purposes only. ArcelorMittal Flat Carbon Europe S.A. reserves the right to change its product range at any time without prior notice.