HOT-ROLLED SHEET

MANUFACTURING PROCESS

The material used in hot rolling is steel slabs with typical dimensions of 12,000 x 1,650 x 250 mm. The slabs are heated in special ovens to up to 1,250° C and then pass through a series of rollers that gradually reduce their thickness. Finally, the slabs are moved onto a roll. Hot-rolled sheet is produced in thicknesses of approx. 1.5 to 20 mm. For better surface finish, the sheet can be pickled after cooling off. Pickling means that the sheet goes through an acid bath that removes iron oxide from the surface. Strip pickled sheet is manufactured in thicknesses of approx. 1.5 to 12 mm.

STEEL GRADES

Mild steel:
Used when forming and drawing properties are more important than tensile ones.
Structural steel:
Used for general construction purposes that do not place such high requirements to plasticity. Guaranteed minimum yield and tensile strength values
High-strength micro-alloyed steel:
Combines high strength and good plasticity. The perfect steel for bending, which also provides great opportunities for weight savings.
Pressure vessel steel:
Designed for closed pressurised containers.
Weathering steel:
Develops an effective atmospheric rust protection of its own.

MECHANICAL PROPERTIES — SOFT STEELS
Steel grades
EN 10111
Yield strength Re
(N/mm2)
Tensile strength Rm
max
(N/mm2)
Elongation min %
A80                 A5
1,5 ≤ t < 2,0 2,0 ≤ t ≤ 8,0 1,5 ≤ t < 2,0 2,0 ≤ t < 3,0 3,0 ≤ t ≤ 8,0
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 transversely to the direction of rolling.
MECHANICAL PROPERTIES — STRUCTURAL STEEL
Steel grades
EN 10 025-2
Yield strength Re
Min
(N/mm2)
Tensile strength Rm
Min-max
(N/mm2)
Elongation min %
A80                 A5
Thickness
t<3 3≤t 1,5≤t<2,0 2,0≤t<2,5 32,5≤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 transversely to the direction of rolling.
MECHANICAL PROPERTIES — HIGH-STRENGTH MICRO-ALLOYED STEELS
EN 10 149 – 2 Yield strength Re
Min (N/mm2)*
Tensile strength Rm
Min-Max (N/mm2)
Elongation min %
A80                 A5
Bendability 180°**
min. mandrel diameter
1,5≤t<2,0 2,0≤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 transversely to the direction of rolling.
**) Bending test values are based on samples taken transversely to the direction of rolling.

SURFACE

Hot-rolled sheet is available with the following variety of surface designs:

  • Unpickled, also referred to as black steel
  • Pickled and oiled
  • Pickled and dry

We offer by default pickled and oiled.

THICKNESS TOLERANCES, ACCORDING TO EN 10 051:

Nominal thickness (mm) Thickness tolerances for 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
above 350 N/mm², tolerances are raised by 15%.
above 400 N/mm², tolerances are raised by 30%.
above 460 N/mm², tolerances are raised by 40%.
Modern rolling mills generally stay within 75% of EN 10051.
Narrower tolerances are available at extra charge.

WIDTH TOLERANCES, ACCORDING TO EN 10 051:

Nominal thickness
(mm)
Width tolerance
(roller edges) (mm)
≤ 700 ≤ 1200 – 0 +20
> 1200 ≤ 1500 – 0 +20
> 1500 ≤ 2070 – 0 +25