Docol® 800DH dual phase with high formability
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Dual phase with high formability steel
Docol® 800DH - TRIP assisted dual-phase steels
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Dual phase with high formability steel
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Docol® 800DH - TRIP assisted dual-phase steels
Docol® 800DH - TRIP assisted dual-phase steels
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General Product Description
Docol 800DH trip assisted dual-phase steels provide improved formability and weldability and are suitable for car safety and structural components.
This steel undergoes a special heat treatment producing mainly two-phase structure. Ferrite that imparts unique forming properties represents one phase and martensite that accounts for the strength represents the other phase. Small amount of bainite and retained austenite improves formability further.
Dimension Range
Cold rolled / GI: thickness 0.80-2.40 mm, width up to 1400 mm.
Slit strip and cut to length sheets are available upon request.
Grade and coating specific restrictions on available dimensions may occur.
Mechanical Properties
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| Standard | Coating | Test direction |
Yield strength Rp0.2 (MPa) |
Tensile strength Rm (MPa) |
Elongation A80 (min %) |
n4-6 (min) |
n10-20/Ag (min) |
BH2 (min MPa) |
|
|---|---|---|---|---|---|---|---|---|---|
| Docol CR440Y780T-DH | VDA 239-100 | GI | L | 440 - 550 | 780 - 900 | 18 | 0.18 | 0.13 | 30 |
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Comparison
Docol CR440Y780T-DH
Standard
VDA 239-100
Coating
GI
Test direction
L
Yield strength Rp0.2
(MPa)
(MPa)
440 - 550
Tensile strength Rm
(MPa)
(MPa)
780 - 900
Elongation A80
(min %)
(min %)
18
n4-6
(min)
(min)
0.18
n10-20/Ag
(min)
(min)
0.13
BH2
(min MPa)
(min MPa)
30
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Chemical Composition (ladle analysis)
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| Coating | C (max %) |
Si (max %) |
Mn (max %) |
P (max %) |
S (max %) |
Al (%) |
Nb+Ti (max %) |
Cr+Mo (max %) |
B (max %) |
Cu (max %) |
|
|---|---|---|---|---|---|---|---|---|---|---|---|
| Docol CR440Y780T-DH | GI | 0.18 | 0.80 | 2.50 | 0.050 | 0.010 | 0.015 - 1.00 | 0.15 | 1.40 | 0.005 | 0.20 |
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Comparison
Docol CR440Y780T-DH
Coating
GI
C
(max %)
(max %)
0.18
Si
(max %)
(max %)
0.80
Mn
(max %)
(max %)
2.50
P
(max %)
(max %)
0.050
S
(max %)
(max %)
0.010
Al
(%)
(%)
0.015 - 1.00
Nb+Ti
(max %)
(max %)
0.15
Cr+Mo
(max %)
(max %)
1.40
B
(max %)
(max %)
0.005
Cu
(max %)
(max %)
0.20
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Tolerances
Hot-dip galvanized (GI): Tolerances in accordance to EN 10143.
Customized dimensional and shape tolerances are available upon request.
Coatings
The metal coating options for Docol products include:
Hot-dip zinc coating (GI) consists almost entirely of zinc (>99%). It is lead free, resulting in a small zinc spangle size. The coating provides good corrosion protection.
Grade specific availability of metal coatings for Docol products is given in the Mechanical properties table (Coating).
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| Coating type | Coating class | Standard | Closest in EN 10346, informative | Coating mass per side, single spot test (g/m2) | Thickness per side informative (µm) | Density (g/cm3) | Surface quality (U = unexposed, E = exposed) |
|---|---|---|---|---|---|---|---|
| GI | 40/40 | VDA 239-100 | Z100 | 40 - 60 1) | 5.6 - 8.5 | 7.1 | U |
| GI | 50/50 | VDA 239-100 | — | 50 - 70 1) | 7.0 - 9.9 | 7.1 | U |
| GI | 60/60 | VDA 239-100 | Z140 | 60 - 90 | 8.5 - 12.7 | 7.1 | U |
| GI | 70/70 | VDA 239-100 | — | 70 - 100 | 9.9 - 14.1 | 7.1 | U |
| GI | 85/85 | VDA 239-100 | — | 85 - 115 | 12.0 - 16.2 | 7.1 | U |
| GI | 115/115 | VDA 239-100 | Z275 | 115 - 155 | 16.2 - 21.8 | 7.1 | U |
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Comparison
Coating type
GI
Coating class
40/40
Standard
VDA 239-100
Closest in EN 10346, informative
Z100
Coating mass per side, single spot test (g/m2)
40 - 60 1)
Thickness per side informative (µm)
5.6 - 8.5
Density (g/cm3)
7.1
Surface quality (U = unexposed, E = exposed)
U
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Coating type
GI
Coating class
50/50
Standard
VDA 239-100
Closest in EN 10346, informative
—
Coating mass per side, single spot test (g/m2)
50 - 70 1)
Thickness per side informative (µm)
7.0 - 9.9
Density (g/cm3)
7.1
Surface quality (U = unexposed, E = exposed)
U
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Coating type
GI
Coating class
60/60
Standard
VDA 239-100
Closest in EN 10346, informative
Z140
Coating mass per side, single spot test (g/m2)
60 - 90
Thickness per side informative (µm)
8.5 - 12.7
Density (g/cm3)
7.1
Surface quality (U = unexposed, E = exposed)
U
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Coating type
GI
Coating class
70/70
Standard
VDA 239-100
Closest in EN 10346, informative
—
Coating mass per side, single spot test (g/m2)
70 - 100
Thickness per side informative (µm)
9.9 - 14.1
Density (g/cm3)
7.1
Surface quality (U = unexposed, E = exposed)
U
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Coating type
GI
Coating class
85/85
Standard
VDA 239-100
Closest in EN 10346, informative
—
Coating mass per side, single spot test (g/m2)
85 - 115
Thickness per side informative (µm)
12.0 - 16.2
Density (g/cm3)
7.1
Surface quality (U = unexposed, E = exposed)
U
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Coating type
GI
Coating class
115/115
Standard
VDA 239-100
Closest in EN 10346, informative
Z275
Coating mass per side, single spot test (g/m2)
115 - 155
Thickness per side informative (µm)
16.2 - 21.8
Density (g/cm3)
7.1
Surface quality (U = unexposed, E = exposed)
U
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In addition to these coating masses, asymmetric coatings and OEM coating specifications are available upon request.
1) For hot-dipped (GI, ZA, GA) hot rolled (HR) grades, the coating mass tolerance is increased to 30 g/m² by increasing the upper limit.
Surface Treatments
Hot-dip galvanized (GI): available as oiled and/or chemically passivated.
All surface treatments are in accordance with RoHS directive (2011/65/EU) and do not contain Chromium VI (Cr6+). Surface treatments provide only temporary surface protection during transportation and storage. In order to avoid corrosion damages, care must be taken to keep the products dry during transportation and storage. If they become wet, they must be separated and situated so that they are dried quickly.
Fabrication and Other Recommendations
For information concerning fabrication, see SSAB´s brochures on www.ssab.com or consult Tech Support.
Appropriate health and safety precautions must be taken when bending, welding, cutting, grinding or otherwise working on the products.
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