PDF brochure DOMEX

Domex range of
hot-rolled high
strength sheet
steel
Domex is the brand name of hot-rolled sheet
steel from SSAB Tunnplåt.
Domex high strength steels are low-alloy,
cold forming steels intended for the engineering and automotive industries. The entire
range extends from Domex MC cold-forming
steels to wear-resistant or corrosion resistant
steels, as well as ballistic protection sheet
steel and electrical sheet steel.
Domex is being continuously developed as
evidenced by the extra-high strength steels.
New ultra-high strength steels with even
higher strength which are currently now
under development, open up entirely new
opportunities.
This brochure describes the range and
characteristics of Domex hot-rolled sheet
steel. It is a general overview to assist in the
selection of the right Domex steel for your
particular product.
CO N T E N TS
4- 5
Domex hot-rolled high strength sheet steel
6-9
Domex high strength cold-forming steels
10-11
Other high strength steels
12-13
Domex hardenable steels – an overview
14-15
Tolerances
16
Other technical information
17
Design approach when using high strength steels
18- 21 High strength steels in production
22- 23 Technical customer service and information
3
Domex
hot-rolled
sheet steel
High strength steels
Domex is the brand name of
SSAB Tunnplåt’s hot-rolled
products and is available as
high strength and extra-high
strength cold-forming steels.
Corrosion-resistant steels,
wear-resistant steels, sheet
steel for ballistic protection,
electrical sheet steel and
hardenable steels are other
members of the Domex family.
Domex high strength coldforming steels are modern
structural steels. Domex YP/
XP steels have been used for
many years in the engineering industry and have been
under continual development.
Domex MC high strength
4
steels have now become well
established on the market and
supersede the Domex YP/XP
steels. New ultra-high strength
Domex 800 and Domex 900
steels are under development
• Domex MC is a range of
high strength cold-forming
steels distinguished by high
strength, excellent formability and good weldability,
which makes them suitable
for a wide range of applications.
Domex high strength steels
have also gradually been
adapted to suit special applications. The following
Domex products each with
specific properties are becoming increasingly widespread
in their use:
• Domex Wear is an abrasionresistant steel with good
wear resistance.
• Domex Weather Resistant
is a corrosion resistant steel
with an atmospheric protection against corrosion.
• Domex Protect has a hardness that gives the sheet
good ballistic and penetration protection properties.
• Domex Pole sheet has high
strength and magnetic properties that make it suitable
for generators.
Domex high strength cold-forming steels
Hardenable steels
Domex hardenable steels
include high-carbon steels,
boron-alloyed steels and casehardening steels:
• Domex high-carbon steels
are suitable for applications
that require very high hardness.
• Domex boron-alloyed steels
are used as wear steel or
high strength structural
steel.
• Domex case-hardening
steels are intended for parts
that require high surface
hardness.
Delivery forms
Domex can be supplied as
coils, slit strip or cut-to-length
sheet. The steels can be supplied with as-rolled or pickled
and oiled surface, and also
with as-rolled or trimmed
edges.
Domex wear-resistant steels
Domex corrosion-resistant steels
Domex hardenable steels
5
Domex high
strength coldforming steels
Domex MC
All Domex high strength coldforming steels are produced
in modern plants under strict
process control. The steels are
micro-alloyed with niobium,
titanium and vanadium,
which enables low carbon
and manganese contents to
be maintained. The steels are
produced by metallurgical
processes that ensure very
high purity of the steels, and
they are then finished in a
carefully controlled thermomechanical rolling process
that ensures consistent properties.
Domex MC high strength
cold-forming steels are
characterised by:
• Excellent formability
in relation to their high
strength.
• Good weldability due to
their low contents of alloying elements.
• Good impact strength at
low temperatures, which
should be specified at the
time of ordering.
• Suitable for laser cutting.
• Suitable for hot-dip galvanising due to their appropriately formulated chemical
composition. The order
should specify that the steel
will be hot-dip galvanised.
Domex MC steels are available
in the strength levels shown in
the figure below.
Steel grades and
mechanical properties
Domex MC high strength
steels are modern low-alloy
structural steels for cold forming. Domex MC is available in
nine steel grades, with grade
designations corresponding to
the minimum yield strength
in the direction of rolling,
Strength levels of Domex cold-forming steels
6
ranging from 315
N/mm2 up to 700 N/mm2.
Domex MC meets the requirements of the EN 10149-2 standard, and is also guaranteed
to allow for tighter minimum
bending radii.
Domex MC has a high yield
strength/tensile strength
relationship. The steel has
high internal purity and can
be bent both along and across
the direction of rolling, with
the minimum radii shown
in the table. The mechanical
properties in the table are
guaranteed in the direction
of rolling.
Impact strength
Domex MC cold-forming
steels have high impact
strength. The test temperatures and the energy levels
that can be guaranteed are
shown in the table.
Mechanical properties
Grade
Yield strength
ReH (N/mm2)
min.
Tensile strength
Rm (N/mm2)
min.- max.
Elongation
min. (%)
A80
A5
t<3
t>3
Domex 240 YP
240
360-460
28**)
Domex 315 MC
Domex 355 MC
Domex 420 MC
Domex 460 MC
Domex 500 MC
Domex 550 MC
Domex 600 MC
Domex 650 MC
Domex 700 MC
315
355
420
460
500
550
600
650*)
700*)
390-510
430-550
480-620
520-670
550-700
600-760
650-820
700-880
750-950
20
19
16
15
14
14
13
12
10
Bending radius
min.
t<3 mm
Bending radius
min.
3<t<6 mm
Bending radius
min.
t>6 mm
28
0,3 x t
0,5 x t
0,7 x t
24
23
20
19
18
17
16
14
12
0.2 x t
0.2 x t
0.4 x t
0.5 x t
0.6 x t
0.6 x t
0.7 x t
0.8 x t
0.8 x t
0.3 x t
0.3 x t
0.5 x t
0.7 x t
0.8 x t
1.0 x t
1.1 x t
1.2 x t
1.2 x t
0.4 x t
0.5 x t
0.8 x t
0.9 x t
1.0 x t
1.2 x t
1.4 x t
1.5 x t
1.6 x t
The bending guarantee is for a 90° bend in practical application.
*) For thicknesses >8 mm, the minimum yield strength may be 20 N/mm2 lower.
**) Denotes A5 (not A80).
Impact strengtht
Designation suffix
Test
temperature
B
D
E
Not impact tested
-20°
-40°
Energy level
Grades
40 J
27 J
Domex 315 MC B- Domex 650 MC B
Domex 315 MC D- Domex 700 MC D
Domex 315 MC E- Domex 700 MC E
Impact strength D can be guaranteed for thicknesses up to 12 mm, and impact strength E can be guaranteed for thicknesses up to 10 mm.
Charpy V testing is carried out on the material in the direction of rolling in accordance with EN 10045-1 for thicknesses from 6 mm upwards.
Chemical composition
Grade
Domex 240 YP
Domex 315 MC
Domex 355 MC
Domex 420 MC
Domex 460 MC
Domex 500 MC
Domex 550 MC
Domex 600 MC
Domex 650 MC
Domex 700 MC
C
(%)
max
Si
(%)
max
Mn
(%)
max
P
(%)
max
S
(%)
max
Al
(%)
min
Nb
(%)
max
V
(%)
max
Ti
(%)
max
0.10
0.10
0.10
0.10
0.10
0.12
0.12
0.12
0.12
0.03
0.03
0.03
0.10
0.10
0.10
0.10
0.10
0.10
1.30
1.50
1.50
1.50
1.60
1.80
1.90
2.00
2.10
0.025
0.025
0.025
0.025
0.025
0.025
0.025
0.025
0.025
0.010
0.010
0.010
0.010
0.010
0.010
0.010
0.010
0.010
0.015
0.015
0.015
0.015
0.015
0.015
0.015
0.015
0.015
0.09
0.09
0.09
0.09
0.09
0.09
0.09
0.09
0.09
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.15
0.15
0.15
0.15
0.15
0.15
0.15
0.15
0.15
The sum of Nb, V and Ti is 0.22% max., Mo is 0.50% max. and B is 0.005% max.
If the material is to be hot-dip galvanized with a thin or thick coat of zinc, this must be specified in the order. For a thick zinc coat, Si is 0.30% max.
7
Dimensions
and delivery
forms
Coils
The delivery range for Domex
MC in coils with as-rolled
surface and as-rolled edge are
shown in the graphs for the
various grades.
The Domex 240 YP, 315 MC
and 355 MC grades are available in thicknesses from 1.8
mm, and other grades from
2.0 mm.
The delivery range for
pickled coils conforms to the
graphs up to a maximum
thickness of 12 mm.
Coils with trimmed edges
can be supplied up to a strip
8
thickness of 10 mm, depending on the steel grade.
Cut-to-length sheet
The delivery range for cutto-length sheet conforms to
the graphs for coils. Pickled
cut-to-length sheet can be
supplied in thicknesses up to
12 mm. Thicknesses above 12
mm are available subject to
special agreement.
As-rolled cut-to-length
sheet can be supplied in thicknesses down to a minimum
of 2 mm. Cut-to-length sheets
are available in lengths up to
13 metres. Lengths up to 16
metres can be supplied subject to special agreement.
Slit strip
Slit strip can be supplied in
widths between 140 mm and
600 mm. Strip is available in
thicknesses of up to 8 mm
depending on the grade, as
shown in the table.
Trimmed edges
If the material is supplied with
trimmed edges, the width is
reduced by 35 mm.
Dimensions of coils and cut-to-length sheet
Dimensions of slit strip
Grade
Strip with as-rolled surface.
Min.-max. thicknesses
Strip with pickled surface.
Min.- max. thicknesses
Grade
Strip with as-rolled surface.
Min.-max. thicknesses
Strip with pickled surface.
Min.-max. thicknesses
Domex 240 YP
Domex 315 MC
Domex 355 MC
Domex 420 MC
Domex 460 MC
Domex 500 MC
Domex 550 MC
Domex 600 MC
Domex 650 MC
Domex 700 MC
1.8–8 mm
1.8–8 mm
1.8–8 mm
2.5–8 mm
2.5–8 mm
2.5–8 mm
2.5–8 mm
2.5–8 mm
2.5–8 mm
2.5–8 mm
1.8–8 mm
1.8–8 mm
1.8–8 mm
2.0–8 mm
2.0–8 mm
2.0–6 mm
2.0–6 mm
2.0–5 mm
2.0–4 mm
2.0–3 mm
Domex 240 YP
Domex 315 MC
Domex 355 MC
Domex 420 MC
Domex 460 MC
Domex 500 MC
Domex 550 MC
Domex 600 MC
Domex 650 MC
Domex 700 MC
*)1.8–16 mm
*)1.8–15 mm
*)1.8–15 mm
2.0–12 mm
2.0-12 mm
2.0-12 mm
2.0-12 mm
2.0-10 mm
2.0-10 mm
2.0-10 mm
1.8–12 mm
1.8–12 mm
1.8–12 mm
2.0–12 mm
2.0–12 mm
2.0–12 mm
2.0–12 mm
2.0–10 mm
2.0–10 mm
2.0–10 mm
*) For cut-to-length sheet, the minimum is 2.0 mm.
59
Other high
strength steels
Domex Wear
Domex Wear enables a reduction in weight and extended
useful life of most utility
products that are subjected to
wear. You can achieve benefits
that would otherwise not be
feasible for durability or economy reasons. Moreover, the
wear-resistant and formable
steel eliminates the need for
hardening the material, which
contributes to a smoother
production flow. The steel has
high strength and toughness,
and is easier to weld and bend
than many other wear-resistant steels.
Domex Wear is produced
in thicknesses between 3
and 6 mm and widths of 900
- 1600 mm, depending on the
thickness.
10
Domex Weather Resistant
In addition to having good
resistance to corrosion,
Domex Weather Resistant steel
is also characterised by good
formability, weldability and
impact strength. It is produced in three strength levels,
and the guaranteed minimum yield strengths are 350
N/mm2, 550 N/mm2 and 700
N/mm2. A typical application
for corrosion-resistant steels
is for containers, where high
strength and resistance to corrosion enable a more suitable
design to be produced, reduce
the need for maintenance
and simplify production. The
material offers major benefits
for industrial chimneys, both
externally and in the flue gas
passages, since the corrosionresistant steels can cope well
with the sulphurous environment.
Domex 355 W is rolled in
thicknesses of 1.8 - 12 mm,
and Domex 550 W and Domex
700 W in thicknesses of 3 - 6
mm. The widths vary between
800 and 1600 mm, depending
on the yield strength and
thickness.
Domex Protect
Domex Protect is the name
used for our ballistic protection steels. The steels can be
used for protecting cars and
security vehicles that may be
exposed to small arms fire.
The steel can also be used as
Chemical composition (typical values)
Grade
C
(%)
Si
(%)
Mn
(%)
P
(%)
S
(%)
Others
Domex Wear
Domex Wear
0.17
0.30
1.8
0.01
0.002
Cr, Mo, Ti
Domex Weather Resistant
Domex 355 W
Domex 550 W
Domex 700 W
0.065
0.070
0.060
0.35
0.35
0.35
0.35
0.65
1.00
0.09
0.09
0.02
0.01
0.01
0.01
Cu, Cr
Cu, Cr
Cu, Cr
Domex Protect
Domex Protect 250
Domex Protect 300
Domex Protect 500
0.06
0.17
0.30
0.07
0.30
0.25
1.8
1.8
1.2
0.01
0.01
0.01
0.002
0.002
0.002
Mo, Nb, Ti
Cr, Mo, Ti
Cr, B
protection against burglaries,
such as in safety doors.
Domex Protect is produced
in thicknesses of 3 - 6 mm,
with hardnesses up to 500
HV10 and widths of 900 1300 mm.
Domex Protect can assist in
lowering the weight of vehicles
protected against ballistic
attack.
Domex Pole sheet
Due to its low content of
alloying elements, Domex Pole
sheet has good magnetic properties. Consistent mechanical
properties and good flatness
make the sheet very well suited
for automatic punching and
laser cutting.
Hot-rolled Pole sheet is produced with yield strengths of
up to 700 N/mm2. Domex Pole
sheet is rolled in thicknesses
ranging between 2 and 5 mm
and widths between 800 and
1600 mm, depending on the
yield strength and thickness.
Domex Pole sheet is used
for rotor rings and poles
of generators, since strict
demands on the magnetic and
mechanical properties and
on flatness are made in this
application.
Mechanical properties
Grade
Yield strength
ReH (N/mm2)
min.
Tensile strength
Rm (N/mm2)
min.
Hardness
Typical values
Bending radius
min. ***)
t≤ 3 mm.
3<t≤ 6 mm.
Domex Wear
Domex Wear
(790) typical value
850
approx. 285 HB
2xt
2xt
Domex Weather Resistant
Domex 355 W
Domex 550 W
Domex 700 W **)
355
550
700
490*)
600
750
1xt
1xt
2xt
1xt
1xt
2xt
0.8 x t
2xt
5xt
1.2 x t
2xt
5xt
Domex Protect
Domex Protect 250
Domex Protect 300
Domex Protect 500
approx. 250 HV10
approx. 300 HV10
approx. 500 HV10
*) For thicknesses <3 mm, the minimum tensile strength is ≥510 N/mm2.
**) Grade in the course of development.
***) Min. bending radius for 90° bend. For Domex 355 W thicker than 6 mm, the minimum bending radius is 2 x t.
11
12
13
Hardenable
steels
Domex case-hardening steels
Domex case-hardening steels
are characterised by good
formability and the scope they
offer for giving the finished
part a hard surface by case
hardening, while maintaining
a tough core.
Domex case-hardening
steels are used in applications
such as wear parts and gearwheels, and are available in
the sizes shown in the graph
below.
Domex case-hardening
steels conform to the requirements of EN 10084.
Domex high-carbon steels
Domex high-carbon steels
are characterised by good
formability and the scope they
offer for producing parts with
very high hardness and good
toughness by quenching and
tempering.
Domex high-carbon steels
are suitable for applications in
which high strength, hardness and wear resistance are
important, such as for knives,
wear parts, saw blades, springs
and chains.
Domex high-carbon steels
conform to the requirements
of EN 10083-1.
Domex boron steels
Domex boron steels may be
a suitable alternative for applications involving abrasive
wear for which conventional
steels are inadequate. Domex
boron steels are alloyed with
boron in order to improve
their hardenability. The steels
are easy to harden and are
often used without tempering.
Domex boron steels are
often used as wear steels or as
high strength structural steels.
Typical applications include
punching tools, spades, knives,
plough shares and saw blades.
Domex boron steels conform to the requirements of
EN 10083-3. Domex boron
steels have also long been
produced as SSAB Tunnplåt
own steel grades, designated
Domex 014 B, 024 B, 034 B
and 044 B.
Case-hardening steels
Boron steels
Boron steels
Boron steels
High-carbon steels
High-carbon steels
14
Hardness HRC
Chemical compositions of Domex case-hardening steels
Grade
C (%)
min.-max.
Si (%)
min.-max.
Mn (%)
min.-max.
Cr (%)
min.-max.
Grade
Quenched in
water, approx.
Quenched in
oil, approx.
Domex C10
Domex C15
Domex 17Cr3
Domex 16MnCr5
Domex 20MnCr5
0.07–0.13
0.12–0.18
0.14–0.20
0.14–0.19
0.17–0.22
0.15–0.35
0.15–0.35
0.15–0.35
0.15–0.35
0.15–0.35
0.30–0.60
0.30–0.60
0.60–0.90
1.00–1.30
1.10–1.40
max 0.40
max 0.40
0.70–1.00
0.80–1.00
1.00–1.30
Domex C10
Domex C15
Domex 17Cr3
Domex 16MnCr5
Domex 20MnCr5
43
43
45
40
40
42
P (%) max. 0.025
S (%) max. 0.025
Hardness HRC
Chemical compositions of Domex high-carbon steels
Grade
C (%)
min.-max.
Si (%)
min.-max.
Mn (%)
min.-max.
Cr (%)
min.-max.
Domex C22
Domex C35
Domex C45
Domex C55
Domex C60
Domex C67
Domex C75
Domex 42CrMo4
Domex 51CrV4
0.17–0.24
0.32–0.39
0.42–0.50
0.52–0.60
0.57–0.65
0.65–0.73
0.70–0.80
0.38–0.45
0.47–0.55
0.15–0.35
0.15–0.35
0.15–0.35
0.15–0.35
0.15–0.35
0.15–0.35
0.15–0.35
0.15–0.35
0.15–0.35
0.40–0.70
0.50–0.80
0.50–0.80
0.60–0.90
0.60–0.90
0.60–0.90
0.60–0.90
0.60–0.90
0.70–1.10
0.20–0.40
0.20–0.40
0.20–0.40
0.20–0.40
0.20–0.40
0.20–0.40
0.20–0.40
0.90–1.20
0.90–1.20
Others
min.-max.
Mo 0.15–0.30
V 0.10–0.25
Grade
Quenched in
water, approx.
Quenched in
oil, approx.
Domex C22
Domex C35
Domex C45
Domex C55
Domex C60
Domex C67
Domex C75
Domex 42CrMo4
Domex 51CrV4
–
53
58
61
63
66
67
57
61
–
50
55
57
60
63
64
54
58
P (%) max. 0.025
S (%) max. 0.025
Hardness HRC
Chemical compositions of Domex boron steels
Grade
C (%)
min.-max.
Si (%)
Mn (%)
min.-max. min.-max.
Cr (%)
min.-max.
B (%)
min.-max.
Grade
Quenched in
water, approx.
Quenched in
oil, approx.
Domex 014 B
Domex 024 B
Domex 034 B
Domex 044 B
Domex 20MnB5
Domex 30MnB5
Domex 38MnB5
Domex 27MnCrB5
Domex 33MnCrB5
Domex 39MnCrB6
0.20-0.25
0.20-0.25
0.25-0.30
0.25-0.30
0.17–0.23
0.27–0.33
0.36–0.42
0.24–0.30
0.30–0.36
0.36–0.42
0.20-0.35
0.20-0.35
0.20-0.35
0.20-0.35
0.20-0.35
0.20-0.35
0.20-0.35
0.20-0.35
0.20-0.35
0.20-0.35
0.15-0.25
0.15-0.25
0.15-0.25
0.40-0.60
0.10–0.30
0.10–0.30
0.10–0.30
0.30–0.60
0.30–0.60
0.30–0.60
0.0008–0.0050
0.0008–0.0050
0.0008–0.0050
0.0008–0.0050
0.0008–0.0050
0.0008–0.0050
0.0008–0.0050
0.0008–0.0050
0.0008–0.0050
0.0008–0.0050
Domex 014 B
Domex 024 B
Domex 034 B
Domex 044 B
Domex 20MnB5
Domex 30MnB5
Domex 38MnB5
Domex 27MnCrB5
Domex 33MnCrB5
Domex 39MnCrB6
48
48
51
51
46
53
56
51
53
55
43
45
48
48
43
50
53
48
50
52
0.7-1.0
1.0-1.3
1.0-1.3
1.0-1.3
1.10–1.40
1.15–1.45
1.15–1.45
1.10–1.40
1.20–1.50
1.40–1.70
P (%) max. 0.030
S (%) max. 0.015
15
16
Tolerances
Domex steels are normally
supplied with tolerances in
accordance with EN 10051
or with tolerances in accordance with the SSAB Tunnplåt
in-house standard. Closer
tolerances on thickness,
width, length and flatness are
available subject to special
agreement.
Tolerances on other
properties are available in
accordance with the EN 10051
standard.
Tolerances on width
Delivery form
SSAB Tunnplåt tolerance
Coils and cut-to-length sheet with mill edges
Coils and cut-to-length sheet with cut edges
Slit strip
-0/ +20 mm
-0/ +2 mm *)
-0/ +2 mm
Closer tolerances on width for slit strip are available subject to special agreement.
*) The tolerance applies up to a nominal thickness of 10 mm.
Tolerances on length of cut-to-length sheet
Length, mm
SSAB Tunnplåt tolerance
- 4000
(4000) - 6000
(6000) - 8000
(8000) -
-0/ +3 mm
-0/ +4 mm
-0/ +5 mm
-0/ +6 mm
SSAB Tunnplåt tolerances on flatness of cut-to-length sheet
Length, mm
≤3000
>3000 ≤ 6000
>6000 ≤ 9000
>9000 ≤ 13000
Tolerance
Normal
Improved
4 mm
5 mm
6 mm
8 mm
3 mm
3 mm
4 mm
6 mm
Greater tolerances are applicable to boron steels, Domex Protect 500 and Domex Wear.
Tolerances on edge camber
Delivery form
Tolerances as per EN 10051
Cut-to-length sheet
with mill edges
2 mm/ 3 m
6 mm/ 6 m
8 mm/ 9 m
10 mm/ 13 m
Coils with cut edges,
slit strip and cut-to-length
sheet with cut edges
2 mm/ m
10 mm/ 6 m
Coils with mill edges
20 mm/ 5 m
Tolerances on thickness
Thickness, mm
Normal tolerance as per EN 10051
Width ≤ 1200
Width > 1200
Tolerance as per SSAB Tunnplåt
Width ≤ 1200
Width > 1200
- 2.0 mm
(2.0) - 2.5 mm
(2.5) - 3.0 mm
(3.0) - 4.0 mm
(4.0) - 5.0 mm
(5.0) - 6.0 mm
(6.0) - 8.0 mm
(8.0) - 10.0 mm
(10.0) - 12.5 mm
(12.5)- 15.0 mm
(15.0) - 16.0 mm
± 0.17 mm
± 0.18 mm
± 0.20 mm
± 0.22 mm
± 0.24 mm
± 0.26 mm
± 0.29 mm
± 0.32 mm
± 0.35 mm
± 0.37 mm
± 0.40 mm
± 0.13 mm
± 0.14 mm
± 0.15 mm
± 0.17 mm
± 0.18 mm
± 0.20 mm
± 0.22 mm
± 0.24 mm
± 0.26 mm
± 0.28 mm
± 0.30 mm
± 0.19 mm
± 0.21 mm
± 0.22 mm
± 0.24 mm
± 0.26 mm
± 0.28 mm
± 0.30 mm
± 0.33 mm
± 0.36 mm
± 0.38 mm
± 0.42 mm
Closer tolerances on thickness are available for cut-to-length sheet, pickled coils and slit strip.
17
± 0.14 mm
± 0.16 mm
± 0.17 mm
± 0.18 mm
± 0.20 mm
± 0.21 mm
± 0.23 mm
± 0.25 mm
± 0.27 mm
± 0.29 mm
± 0.32 mm
Surface finish
Domex can be supplied with
as-rolled surface or pickled
surface. To prevent corrosion,
pickled sheet is usually oiled
with a light, normal or abundant quantity, but is also available in dry condition.
Other
technical
information
Weights and delivery form
Domex is supplied in coil
weights corresponding to
multiples of 18 kg/mm of strip
width or 9 kg/mm of strip
width.
Coils and slit strip are
supplied with the inside diameter in accordance with the
table below.
Cut-to-length strip is delive-red in stack weights of up to
2500 kg per metre length,
although not exceeding
10 000 kg.
Packaging
Our different packaging types
provide different levels of protection during transport. The
simplest type of packaging
comprises only strapping and
is intended mainly for asrolled material. Coils can also
be protected with paper or
plastic film. Cut-to-length
sheet bundles can be packaged in plastic, on pallets or
with strapped spacers.
Inside diameter
Delivery form
Inside diameter
762 mm
610 mm
Coils with as-rolled surface
Coils with as-rolled surface and
cut edges
Pickled coils
Slit strip
X
X
X
X
X
X
X
An inside diameter of 508 mm is available, subject to agreement, for coils with trimmed edges and for slit strip.
Stack weights and stack heights
18
Stack weight, kg
min.
Stack weight, kg
max.
Stack height, mm
min.
Stack height, mm
max.
1000
10 000
30
600
Design
approach when
using high
strength steels
t2= t1 (Re1/Re2)
t1 = thickness of mild steel
t2 = thickness of high strength steel
Re1 = yield strength of mild steel
Re2 = yield strength of high
strength steel
Rule of thumb
The weight of a product can
be reduced without loss of
load-bearing capacity by
switching from mild steel to
high strength steel. Scope for
reducing the deadweight is
one of the major benefits of
using Domex cold-forming
steel. A simple rule of thumb
can be used for a rough
assessment of how much lighter the product can be.
Rule of thumb
A rule of thumb can often be
used for assessing the achievable reduction in thickness,
as illustrated by the following
example:
An ordinary freight container is manufactured
from material with a
minimum yield strength
of about 350 N/mm2. By
switching to Domex 700
MC, i.e. a steel with twice
the strength, the material
thickness in the corner
post, for instance, can be
reduced from 6 mm to
4 mm.
6
350/700 = 4
In this example, the tare
weight of a 45-foot container can be reduced
from 4750 kg to 4020 kg,
i.e. by 730 kg (or about
15%) by using extra-high
strength steel. The payload can thus be increased
correspondingly.
On the other hand, if the product is to be made stronger,
the original thickness can be
retained and only the grade of
steel can be changed.
“Thinking high strength”
right from the beginning of
the design stage is important
for optimising the design to
achieve low weight and simplified production.
Further information on the
design approach when using
high strength sheet steel is
available in the Sheet Steel
Handbook from SSAB
Tunnplåt. A number of seminars related to the Sheet Steel
Handbook are also held every
year. For further information,
please contact the Technical
Customer Service Department
at SSAB Tunnplåt in Borlänge.
Benefits of using Domex extrahigh strength steels
By using Domex extra-high
strength steels, products can
be made lighter, stronger and
more competitive.
The use of high strength
steels provides environmental benefits by conservation
of raw material and energy,
reduced deadweight, increased
payload and a longer useful
life. Additionally, all steel can
always be recycled.
In collaboration with SSAB
Tunnplåt, many customers
have developed total solutions
using Domex high strength
steels, and have achieved the
following typical benefits:
• Lower weight
• Simplified production
• Stronger structure
• Environmental benefits
• Greater competitiveness.
19
High strength
steels in
production
Welding
The weldability of Domex
cold-forming steels is excellent and all conventional
methods of welding can be
used. Due to their low content
of alloying elements, the steels
are not susceptible to hot or
cold cracking due to hydrogen
embrittlement, and therefore
no preheating of the workpiece is necessary.
A wide range of filler metals
from various suppliers is
available. In MAG welding, for
example, both ordinary homogeneous wire and flux cored
wire can be used. Matching
filler metals are also available
for cold-forming steels with
the highest strengths. These
produce a weld that is as
strong as the steel itself.
20
In many cases, under-matched
filler metal can be used, such
as when welding in lightly
stressed areas or when welding high strength steel to
mild steel. The impact strength
of the welded joint will also be
good, but this pre-supposes
that filler metal with good
impact strength is used.
For further information on
welding of cold-forming steels,
refer to the separate brochure
and the Joining Handbook
from SSAB Tunnplåt.
Bending
Domex cold-forming steels
combine high strength with
good bendability. Due to its
low carbon and sulphur contents, the sheet can be bent to
tight radii without cracking,
regardless of the direction of
rolling.
When bending extra-high
strength material such as
Domex 700 MC, the radius
of the punch is fundamental
to the inside radius of the
finished bend. As a result, the
die width can be increased
(reduces the necessary force
and friction) and the required
inside radius of the bend can
still be achieved. On the other
hand, when bending mild
steels, the die width is the
most important parameter.
When high strength material is being bent, the springback is greater than it is in
mild steel. This is usually
compensated for by overbending the material in order
to obtain the correct angle.
If a mild steel is replaced by
a high strength steel and the
material thickness is also
reduced, the bending force
will often be lower than for
mild steel.
Further information on
bending cold-forming steels
is available in the Sheet Steel
Forming Handbook from
SSAB Tunnplåt.
Pressing
Domex high strength steels
have good formability and can
be formed in the traditional
way. However, some factors
that should be kept in mind
when pressing high strength
steels are outlined below.
A higher press force is
generally required and also a
higher blank-holder force in
order to avoid wrinkling and
springback. Modified blank
design and larger radii are
other measures that simplify
the forming of parts made
of high strength sheet steel.
Domex cold-forming steels are
very formable in grades up
to Domex 420 MC, but steels
of higher strengths also have
good pressability.
For further particulars of
pressing, refer to the Sheet
Steel Forming Handbook from
SSAB Tunnplåt.
Shearing
Domex cold-forming steels
are well suited for shearing.
However, to achieve the best
results, it is important to use
the right shearing parameters.
The shear strength is trad-
itionally taken as 0.8 x tensile
strength, i.e. the shearing force
increases proportionally with
increasing strength. However,
studies by SSAB Tunnplåt have
shown that the shear strength
gradually decreases with
increasing strength to 0.6 x
tensile strength. In addition, if
the sheet thickness is reduced,
which is common on changeover from mild steel to high
strength steel, the shearing
force will be reduced further.
This leads to the shearing
force often being lower than
previously.
If the edge of the sheet steel
is subjected to heavy plastic
forming, thermal cutting of
the sheet steel can produce
better results when stronger
and thicker material is used.
Further information on
shearing is available in a separate brochure and in the Sheet
Steel Forming Handbook from
SSAB Tunnplåt.
of the cut.
Experience gained at SSAB
shows that a pickled and oiled
surface is best. The results are
also affected by the internal
purity, flatness and internal
stresses in the sheet. SSAB
Tunnplåt has undertaken a
number of studies of the laser
cutting properties of Domex
cold-forming steels, and the
results are:
Cutting
Laser cutting produces a
high quality and precise cut
surface. Domex cold-forming
steels have excellent properties
that make them particularly
well suited for laser cutting.
High cutting speeds can be
maintained, while also achieving good quality of the cut
surface. The burr on cut edges
is small, and the cut surfaces
are smooth and straight.
The surface of the sheet is
very important to the quality
Plasma cutting
Plasma cutting can be used
on Domex cold-forming steels
without limitations. However,
if air plasma is used, some
care must be taken just as
for all other types of steel.
Air plasma cutting causes
nitrogen absorption at the
cut surface, which may cause
porosity in the joint during
subsequent welding.
• Domex cold-forming steels
require no special cutting
parameters.
• Domex cold-forming steels
meet the requirements of
the standard for the highest
cutting class in accordance
with DIN 2310, part 5 as
regards both surface
smoothness and conicity.
Further information on laser
cutting is available in a separate brochure.
21
Technical
customer service and information
SSAB Tunnplåt has many
experts who have long practical experience of steel and
who are at the disposal of our
customers.
Our experts in the
Technical Customer Service
Department have great experience of materials, design and
metalworking.
Our experts in Applications
engineering have spearhead
expertise in subjects such as
corrosion, painting, sizing,
forming, joining and surface
treatment.
Courses and seminars
SSAB Tunnplåt arranges
regular courses and seminars
on how to optimise the many
opportunities offered by high
strength steels.
• The sheet steel course provides a fundamental insight
into steelmaking, and the
properties and applications
of the various steel grades.
• Seminars provide in-depth
knowledge of sizing, design,
working, forming and joining of high strength steels.
• Some seminars are tailored
to the needs of individual
companies.
Handbooks
You can gain a deeper understanding of Domex products
from our handbooks.
• The Sheet Steel Handbook
offers information on
sizing and design, as well
as production engineering
advice, particularly for
high strength cold-forming
steels.
• The Sheet Steel Forming
Handbook is a further
development of the chapter
on working in the Sheet
Steel Handbook and offers
further information on
plastic working and
machining of cold-forming
steels.
Our courses and seminars attract many participants.
22
• The Joining Handbook
deals with various types of
welding, mechanical joining
and bonding.
Trial sheets
If you wish to find out how a
new grade of steel performs
on your production equipment
or for in the intended product,
you can order trial sheets
from our Trial Sheet Stores.
Certificates
SSAB Tunnplåt has gained
environmental certification
in accordance with ISO 14001
and quality certification in
accordance with ISO 9002 and
QS 9000.
Visit our homepages!
Product information
Further information on our
high strength steel grades
and on how they can be used
and worked is available in our
brochures.
www.ssabtunnplat.com
www.businessteel.com
www.steelprize.com
www.ssabdirect.com
23
SSAB Tunnplåt AB is the largest
Scandinavian steel sheet manufacturer
and a leader in Europe in the development of advanced high strength steels.
SSAB Tunnplåt is a member of the SSAB
Swedish Steel Group, has a turnover of
SEK 10 billion, and employs more than
4400 people in Sweden. We produce
around 2.8 million tonnes of sheet steel
every year.
Our environmental policy involves continual improvements to the efficiency of
production processes and environmental
care plants, and development of the
environmental properties of our products
from the life cycle perspective.
We manufacture the following steels in
our modern, high-efficiency production
lines and rolling mills for strip products:
Hot-rolled steel strip
Cold-reduced sheet steel
Hot-dip galvanized sheet steel
Prepainted sheet steel
Registered trademarks for
SSAB Tunnplåt AB.
SSAB Tunnplåt AB
SE-781 84 Borlänge
Sweden
Tel +46 243 700 00
Fax +46 243 720 00
[email protected]
ssabtunnplat.com
Denmark
SSAB Svensk Stål A/S
Tel +45 4320 5000
ssab.dk
Great Britain
SSAB Swedish Steel Ltd
Tel +44 1905 795794
swedishsteel.co.uk
Norway
SSAB Svensk Stål A/S
Tel +47 23 11 85 80
ssab.no
USA
SSAB Swedish Steel Inc
Tel +1 412 269 21 20
swedishsteel.us
Finland
OY SSAB Svenskt Stål AB
Tel +358 9 686 6030
ssab.fi
Italy
SSAB Swedish S.p.A
Tel +39 030 90 58 811
ssab.it
Poland
SSAB Swedish Steel Sp.z.o.o.
Tel +48 602 72 59 85
South Africa
SSAB Swedish Steel Pty Ltd
Tel +27 11 827 0311
swedishsteel.co.za
France
SSAB Swedish Steel SA
Tel +33 1 55 61 91 00
ssab.fr
The Netherlands
SSAB Swedish Steel BV
Tel +31 24 67 90 550
ssab.nl
Germany
SSAB Swedish Steel GmbH
Tel +49 211 91 25-0
Tel +49 711 6 87 84-0
ssab.de
Portugal
SSAB Swedish Steel
Tel +351 256 371 610
ssab.pt
Spain
SSAB Swedish Steel SL
Tel +34 91 300 5422
ssab.es
China
SSAB Swedish Steel
Tel +86 10 6466 3441
swedishsteel.cn
Korea
SSAB Swedish Steel Ltd
Tel +822 761 6172
GB 301 www.confetti.se / Tryck: Sandvikens Tryckeri
We assist our customers in selecting the
steels that are best able to improve their
competitiveness. Our strength lies in the
quality of our products, the reliability of
our supplies, and our flexible technical
customer service.