Material types
Hot-Rolled Steel
MANUFACTURING PROCESS
Hot rolling begins with steel slabs measuring 12,000 × 1,650 × 250 mm. The slabs are heated in specialised furnaces to approximately 1,250 °C before passing through a series of rolling stands, where their thickness is gradually reduced. The resulting hot-rolled steel is then wound into coils.
Hot-rolled steel is available in thicknesses ranging from approximately 1,50 to 20 mm. To achieve a cleaner surface finish, the steel coil can be pickled after cooling. During pickling, the material passes through an acid bath that removes iron oxide (mill scale) from the surface. Pickled steel is available in thicknesses ranging from approximately 1,50 to 15 mm.
Steel grades
Mild steel:
Used when formability and pressability are more important than strength.
Structural steel:
Used for general structural purposes, where the requirement for formability is not particularly high. Guaranteed minimum values for yield and tensile strength.
High-strength micro-alloyed steel:
Combines high strength with good formability. Ideal steel for bending, with good potential for weight savings.
Pressure vessel steel:
Intended for sealed, pressurised vessels.
Weathering steel:
Develops an effective, self-forming atmospheric corrosion protection layer.
Mechanical properties – mild steel
| Steel grade EN 10111:2008 |
Yield strength Re (N/mm²) |
Tensile strength Rm max (N/mm²) |
Min. elongation % A80 A5 |
|||
|---|---|---|---|---|---|---|
| 1,5 ≤ t < 2,0 | 2,0 ≤ t ≤ 11,0 | 1,5 ≤ t < 2,0 | 2,0 ≤ t < 3,0 | 3,0 ≤ t ≤ 11,0 | ||
| DD11 | 170-360 | 170-340 | 440 | 23 | 24 | 28 |
| DD12 | 170-340 | 170-320 | 420 | 25 | 26 | 30 |
| DD13 | 170-330 | 170-310 | 400 | 28 | 29 | 33 |
| DD14 | 170-310 | 170-290 | 380 | 31 | 32 | 36 |
Values are based on samples taken across the rolling direction.
Mechanical properties – structural steel
| Steel grade EN 10025-2:2019 |
Yield strength Re Min (N/mm²) |
Tensile strength Rm Min-max (N/mm²) |
Min. elongation % A80 A5 Thickness |
||||
|---|---|---|---|---|---|---|---|
| t ≤ 16 | t < 3,0 | 3,0 ≤ t | 1,5 < t ≤ 2,0 | 2,0 < t ≤ 2,5 | 2,5 < t < 3,0 | 3,0 ≤ t | |
| S235JR | 235 | 360-510 | 360-510 | 17 | 18 | 19 | 24 |
| S275JR | 275 | 430-580 | 410-560 | 15 | 16 | 17 | 21 |
| S355JR | 355 | 510-680 | 470-630 | 14 | 15 | 16 | 20 |
Values are based on samples taken across the rolling direction.
Mechanical properties – high-strength micro-alloyed steel
| EN 10149-2:2013 | Yield strength Re Min (N/mm²)* |
Tensile strength Rm (N/mm²) |
Min. elongation % A80 A5 |
180° bendability** min. mandrel diameter |
|
|---|---|---|---|---|---|
| t < 3,0 | t ≥ 3,0 | ||||
| S315MC | 315 | 390-510 | 20 | 24 | 0 x t |
| S355MC | 355 | 430-550 | 19 | 23 | 0,5 x t |
| S420MC | 420 | 480-620 | 16 | 19 | 0,5 x t |
| S460MC | 460 | 520-670 | 14 | 17 | 1,0 x t |
| S500MC | 500 | 550-700 | 12 | 14 | 1,0 x t |
| S550MC | 550 | 600-760 | 12 | 14 | 1,5 x t |
| S600MC | 600 | 650-820 | 11 | 13 | 1,5 x t |
| S650MC | 650 | 700-880 | 10 | 12 | 2,0 x t |
| S700MC | 700 | 750-950 | 10 | 12 | 2,0 x t |
*) Tensile test values are based on samples taken across the rolling direction.
**) Bend test values are based on samples taken across the rolling direction.
Surface
Hot-rolled sheet is available with the following surface finishes:
• Unpickled, also known as black
• Pickled and oiled
• Pickled, dry
Our standard finish is pickled and oiled.
Thickness tolerances
Thickness tolerances according to EN 10051:2024
| Nominal thickness (mm) | Thickness tolerances for steel with yield strength Re ≤ 300 MPa (category A) and nominal width (mm) | |||
|---|---|---|---|---|
| ≤ 1200 | > 1200 ≤ 1500 | > 1500 ≤ 1800 | > 1800 | |
| ≤ 2,00 | ±0,17 | ±0,19 | ±0,21 | – |
| > 2,00 ≤ 2,50 | ±0,18 | ±0,21 | ±0,23 | ±0,25 |
| > 2,50 ≤ 3,00 | ±0,20 | ±0,22 | ±0,24 | ±0,26 |
| > 3,00 ≤ 4,00 | ±0,22 | ±0,24 | ±0,26 | ±0,27 |
| > 4,00 ≤ 5,00 | ±0,24 | ±0,26 | ±0,28 | ±0,29 |
| > 5,00 ≤ 6,00 | ±0,26 | ±0,28 | ±0,29 | ±0,31 |
| > 6,00 ≤ 8,00 | ±0,29 | ±0,30 | ±0,31 | ±0,35 |
| > 8,00 ≤ 10,00 | ±0,32 | ±0,33 | ±0,34 | ±0,40 |
| > 10,00 ≤ 12,50 | ±0,35 | ±0,36 | ±0,37 | ±0,43 |
| > 12,50 ≤ 15,00 | ±0,37 | ±0,38 | ±0,40 | ±0,46 |
For steel grades with a specified yield strength
> 300 N/mm² the thickness tolerances are increased by 15%.
> 360 N/mm² the thickness tolerances are increased by 30%.
> 420 N/mm² the thickness tolerances are increased by 40%.
Modern rolling mills generally stay within 75% of EN 10051:2024.
Tighter tolerances can be agreed at an additional cost.
Width tolerances
Width tolerances according to EN 10051:2024
Nominal width (mm)
Mill edge, i.e. uncut edge (mm)
≤ 1200 − 0 / + 20 > 1200 ≤ 1850 − 0 / + 20 > 1850 − 0 / + 25
Wide range of materials
We offer a wide range of material grades, including hot-rolled, cold-rolled, hot-dip galvanized, Aluzinc, zinc-magnesium, electro-galvanized, Corrender, and coated materials. Material samples and test certificates can also be provided to document both mechanical and chemical properties.
Width tolerances according to EN 10051:2024
| Nominal width (mm) | Mill edge, i.e. uncut edge (mm) |
|---|---|
| ≤ 1200 | − 0 / + 20 |
| > 1200 ≤ 1850 | − 0 / + 20 |
| > 1850 | − 0 / + 25 |
Wide range of materials
We offer a wide range of material grades, including hot-rolled, cold-rolled, hot-dip galvanized, Aluzinc, zinc-magnesium, electro-galvanized, Corrender, and coated materials. Material samples and test certificates can also be provided to document both mechanical and chemical properties.