Hot rolled steels for one-side enamelling are steels with a specific chemical composition, which can guarantee:

• Excellent resistance to "fish scale" defects in the enamelled parts
• Conservation of mechanical properties after forming and firing of the enamel

Two grades are available to match the requirements of different applications: S240EK AM FCE and S300EK AM FCE, which can be supplied pickled or unpickled and oiled or unoiled.

Grades S240EK AM FCE and S300EK AM FCE are used to manufacture water heater tanks with very good mechanical strength and good resistance to in-service stresses. In addition, by using these grades, and S300EK AM FCE in particular, the thickness of the steel can be reduced.

After enamelling, the inside wall of the tank has excellent corrosion, heat and moisture resistance.

Hot rolled steels for one-side enamelling are mainly intended for the manufacture of tanks for water heaters. They can also be used for enamelled tubes or coiled pipes.

Forming of hot rolled grades for one-side enamelling presents no particular problems:

• Grade S300EK AM FCE is particularly recommended for the manufacture of cylindrical sections by rolling 
• Grade S240EK AM FCE is preferable for deep drawn top and bottom parts

All the usual welding processes can be used (TIG, MIG, seam welding, laser).

Surface preparation and enamelling of water heaters

The surface must be treated by pickling or shot blasting.

Enamel can be applied in a wet or dry process.
Firing is performed at a temperature of about 830°C.

Conservation of mechanical properties after enamelling

The mechanical properties of hot rolled steel for one-side enamelling remain unchanged after forming and firing of the enamel. This offers the following advantages:

• It extends the life span of water heaters by increasing their fatigue safety margin
• The thickness of the steel can be reduced, thereby reducing the cost of the raw materials for the water heater. Simulation and calculation tools at your disposal in our laboratories will enable us to optimise the thickness required for the piece and arrive at the best balance between cost and technical requirements

Hot rolled steel for one-side enamelling: unpickled

Full table

Thickness (mm)	S240EK AM FCE		S300EK AM FCE
	Min width	Max width	Min width	Max width
1.50 ≤ th < 1.70	600	1250	660	1320
1.70 ≤ th < 1.80		1460		1498
1.80 ≤ th < 1.90		1520		1545
1.90 ≤ th < 2.00		1575		1598
2.00 ≤ th < 2.20		1630		1635
2.20 ≤ th < 2.30		1740
2.30 ≤ th < 2.40		1800		1735
2.40 ≤ th < 2.50		1855
2.50 ≤ th < 2.70		1885		1838
2.70 ≤ th < 2.80				1860
2.80 ≤ th < 2.90				1885
2.90 ≤ th < 3.30				1935
3.30 ≤ th < 6.10		2035		2035
6.10 ≤ th < 16.00		2137		1885
16.00 ≤ th < 25.00		-	-	-

S240EK AM FCE

S240EK AM FCE

Thickness (mm)	Min width	Max width
1.50 ≤ th < 1.70	600	1250
1.70 ≤ th < 1.80		1460
1.80 ≤ th < 1.90		1520
1.90 ≤ th < 2.00		1575
2.00 ≤ th < 2.20		1630
2.20 ≤ th < 2.30		1740
2.30 ≤ th < 2.40		1800
2.40 ≤ th < 2.50		1855
2.50 ≤ th < 2.70		1885
2.70 ≤ th < 2.80
2.80 ≤ th < 2.90
2.90 ≤ th < 3.30
3.30 ≤ th < 6.10		2035
6.10 ≤ th < 16.00		2137
16.00 ≤ th < 25.00		-

S300EK AM FCE

S300EK AM FCE

Thickness (mm)	Min width	Max width
1.50 ≤ th < 1.70	660	1320
1.70 ≤ th < 1.80		1498
1.80 ≤ th < 1.90		1545
1.90 ≤ th < 2.00		1598
2.00 ≤ th < 2.20		1635
2.20 ≤ th < 2.30
2.30 ≤ th < 2.40		1735
2.40 ≤ th < 2.50
2.50 ≤ th < 2.70		1838
2.70 ≤ th < 2.80		1860
2.80 ≤ th < 2.90		1885
2.90 ≤ th < 3.30		1935
3.30 ≤ th < 6.10		2035
6.10 ≤ th < 16.00		1885
16.00 ≤ th < 25.00	-	-

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Hot rolled steel for one-side enamelling: pickled

Full table

Thickness (mm)	S240EK AM FCE		S300EK AM FCE
	Min width	Max width	Min width	Max width
1.50 ≤ th < 1.60	628	1250	660	1320
1.60 ≤ th < 1.80	600	1400		1400
1.80 ≤ th < 1.90		1520	600	1545
1.90 ≤ th < 2.00		1575		1595
2.00 ≤ th < 2.10		1625		1638
2.10 ≤ th < 2.20		1685
2.20 ≤ th < 2.25		1740		1660
2.25 ≤ th < 2.30		1770		1738
2.30 ≤ th < 2.40		1800
2.40 ≤ th < 2.50		1855
2.50 ≤ th < 2.75		1885		1838
2.75 ≤ th < 3.00				1938
3.00 ≤ th < 4.00		2000		2000
4.00 ≤ th < 6.00			660
6.00 ≤ th < 6.45			628
6.45 ≤ th < 6.50		1565	-	1565
6.50 ≤ th < 6.60		1550		1550

S240EK AM FCE

S240EK AM FCE

Thickness (mm)	Min width	Max width
1.50 ≤ th < 1.60	628	1250
1.60 ≤ th < 1.80	600	1400
1.80 ≤ th < 1.90		1520
1.90 ≤ th < 2.00		1575
2.00 ≤ th < 2.10		1625
2.10 ≤ th < 2.20		1685
2.20 ≤ th < 2.25		1740
2.25 ≤ th < 2.30		1770
2.30 ≤ th < 2.40		1800
2.40 ≤ th < 2.50		1855
2.50 ≤ th < 2.75		1885
2.75 ≤ th < 3.00
3.00 ≤ th < 4.00		2000
4.00 ≤ th < 6.00
6.00 ≤ th < 6.45
6.45 ≤ th < 6.50		1565
6.50 ≤ th < 6.60		1550

S300EK AM FCE

S300EK AM FCE

Thickness (mm)	Min width	Max width
1.50 ≤ th < 1.60	660	1320
1.60 ≤ th < 1.80		1400
1.80 ≤ th < 1.90	600	1545
1.90 ≤ th < 2.00		1595
2.00 ≤ th < 2.10		1638
2.10 ≤ th < 2.20
2.20 ≤ th < 2.25		1660
2.25 ≤ th < 2.30		1738
2.30 ≤ th < 2.40
2.40 ≤ th < 2.50
2.50 ≤ th < 2.75		1838
2.75 ≤ th < 3.00		1938
3.00 ≤ th < 4.00		2000
4.00 ≤ th < 6.00	660
6.00 ≤ th < 6.45	628
6.45 ≤ th < 6.50	-	1565
6.50 ≤ th < 6.60		1550

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