Docol® 900M martensitic
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Martensitic steel
Docol® 900M - Extremely high tensile strength steel
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Martensitic steel
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Docol® 900M - Extremely high tensile strength steel
Docol® 900M - Extremely high tensile strength steel
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General Product Description
Docol 900M martensitic steel helps improve crashworthiness and ensure a lightweight design and cost-efficient production methods for the automotive industry. Docol is one of the strongest cold rolled advanced high-strength steels on the market and has become the material of choice for automotive applications such as side impact beams, bumpers and structural components.
Dimension Range
Cold rolled / UC, EG: thickness 0.50-2.10 mm, width up to 1527 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 %) |
Min. inner bending radius for a 90° bend | |
|---|---|---|---|---|---|---|---|
| Docol CR700Y900T-MS | SSAB | UC, EG | L | 700 - 1000 | 900 - 1100 | 3 | 3.0 x t |
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Comparison
Docol CR700Y900T-MS
Standard
SSAB
Coating
UC, EG
Test direction
L
Yield strength Rp0.2
(MPa)
(MPa)
700 - 1000
Tensile strength Rm
(MPa)
(MPa)
900 - 1100
Elongation A80
(min %)
(min %)
3
Min. inner bending radius for a 90° bend
3.0 x t
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The testing of mechanical properties of electrogalvanized products is conducted without coating.
Chemical Composition (ladle analysis)
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| Coating | C (max %) |
Si (max %) |
Mn (max %) |
P (max %) |
S (max %) |
Al (%) |
Nb+Ti (max %) |
|
|---|---|---|---|---|---|---|---|---|
| Docol CR700Y900T-MS | UC, EG | 0.08 | 0.40 | 2.40 | 0.025 | 0.010 | From 0.015 | 0.10 |
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Comparison
Docol CR700Y900T-MS
Coating
UC, EG
C
(max %)
(max %)
0.08
Si
(max %)
(max %)
0.40
Mn
(max %)
(max %)
2.40
P
(max %)
(max %)
0.025
S
(max %)
(max %)
0.010
Al
(%)
(%)
From 0.015
Nb+Ti
(max %)
(max %)
0.10
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Tolerances
Cold rolled (UC, EG): Tolerances in accordance to EN 10131.
Customized dimensional and shape tolerances are available upon request.
The following improved flatness tolerances are available for cold rolled martensitic products upon request. The tolerances are valid for mother coils only before slitting.
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| Thickness (mmin) |
Max height 1) (mm) |
|---|---|
| 0.80 - 0.990.031 - 0.039 | 8 |
| 1.00 - 1.390.0394 - 0.0547 | 7 |
| 1.40 - 1.590.0551 - 0.0626 | 6 |
| 1.60 - 1.790.0630 - 0.0705 | 5 |
| 1.80 - 2.100.0709 - 0.0827 | 4 |
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Comparison
Thickness
(mmin)
(mmin)
0.80 - 0.990.031 - 0.039
Max height 1)
(mm)
(mm)
8
Thickness
(mmin)
(mmin)
1.00 - 1.390.0394 - 0.0547
Max height 1)
(mm)
(mm)
7
Thickness
(mmin)
(mmin)
1.40 - 1.590.0551 - 0.0626
Max height 1)
(mm)
(mm)
6
Thickness
(mmin)
(mmin)
1.60 - 1.790.0630 - 0.0705
Max height 1)
(mm)
(mm)
5
Thickness
(mmin)
(mmin)
1.80 - 2.100.0709 - 0.0827
Max height 1)
(mm)
(mm)
4
EG coated martensitic grades are supplied with improved flatness tolerances.
1) Distance from the top surface of the strip normal to flat surface. Measured with a ruler on sheets of mother coil width and minimum length 1200 mm. Cross bow and coil set excluded.
Coatings
The metal coating options for Docol products include:
Electrogalvanized coating (EG) is applied continuously by electro deposition. The coating consists of zinc (>99%). Electrogalvanized steel is characterized by its excellent surface quality and uniform coating thickness.
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 standard, informative 1) | Coating mass per side, single spot test (g/m2) | Thickness per side informative (µm) |
|---|---|---|---|---|---|
| EG | 12/12 | VDA 239-100 | ZE25/25 | 12 - 32 | 1.7 - 4.5 |
| EG | 18/18 | VDA 239-100 | — | 18 - 38 | 2.5 - 5.4 |
| EG | 29/29 | VDA 239-100 | ZE50/50 | 29 - 49 | 4.1 - 6.9 |
| EG | 47/47 | VDA 239-100 | ZE75/75 | 47 - 61 | 6.6 - 8.6 |
| EG | 50/50 | VDA 239-100 | — | 50 - 70 | 7.0 - 9.9 |
| EG | 53/53 | VDA 239-100 | — | 53 - 73 | 7.5 - 10.3 |
| EG | 60/60 | VDA 239-100 | — | 60 - 80 | 8.5 - 11.3 |
| EG | 65/65 | VDA 239-100 | ZE100/100 | 65 - 85 | 9.2 - 12.0 |
| EG | 70/70 | VDA 239-100 | — | 70 - 90 | 9.9 - 12.7 |
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Comparison
Coating type
EG
Coating class
12/12
Standard
VDA 239-100
Closest in EN standard, informative 1)
ZE25/25
Coating mass per side, single spot test (g/m2)
12 - 32
Thickness per side informative (µm)
1.7 - 4.5
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Coating type
EG
Coating class
18/18
Standard
VDA 239-100
Closest in EN standard, informative 1)
—
Coating mass per side, single spot test (g/m2)
18 - 38
Thickness per side informative (µm)
2.5 - 5.4
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Coating type
EG
Coating class
29/29
Standard
VDA 239-100
Closest in EN standard, informative 1)
ZE50/50
Coating mass per side, single spot test (g/m2)
29 - 49
Thickness per side informative (µm)
4.1 - 6.9
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Coating type
EG
Coating class
47/47
Standard
VDA 239-100
Closest in EN standard, informative 1)
ZE75/75
Coating mass per side, single spot test (g/m2)
47 - 61
Thickness per side informative (µm)
6.6 - 8.6
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Coating type
EG
Coating class
50/50
Standard
VDA 239-100
Closest in EN standard, informative 1)
—
Coating mass per side, single spot test (g/m2)
50 - 70
Thickness per side informative (µm)
7.0 - 9.9
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Coating type
EG
Coating class
53/53
Standard
VDA 239-100
Closest in EN standard, informative 1)
—
Coating mass per side, single spot test (g/m2)
53 - 73
Thickness per side informative (µm)
7.5 - 10.3
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Coating type
EG
Coating class
60/60
Standard
VDA 239-100
Closest in EN standard, informative 1)
—
Coating mass per side, single spot test (g/m2)
60 - 80
Thickness per side informative (µm)
8.5 - 11.3
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Coating type
EG
Coating class
65/65
Standard
VDA 239-100
Closest in EN standard, informative 1)
ZE100/100
Coating mass per side, single spot test (g/m2)
65 - 85
Thickness per side informative (µm)
9.2 - 12.0
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Coating type
EG
Coating class
70/70
Standard
VDA 239-100
Closest in EN standard, informative 1)
—
Coating mass per side, single spot test (g/m2)
70 - 90
Thickness per side informative (µm)
9.9 - 12.7
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Docol metal coated products are available with surface quality for unexposed applications.
In addition to these coating masses, OEM specific coatings and single sided EG coatings are available upon request.
1) For GI and GA the closest informative value refers to EN 10346. For EG to EN 10152.
Surface Treatments
Uncoated (UC): available as oiled.
Electrogalvanized (EG): available as oiled and/or chemically passivated or phosphated.
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.
Docol® Martensitic steel product offer
Docol® 900M martensitic
Docol® 1100M martensitic
Docol® 1200M martensitic
Docol® 1300M martensitic
Docol® 1400M martensitic
Docol® 1500M martensitic
Docol® 1700M martensitic
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