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Dual phase steels are hot dip galvanised high-strength steels with a dual phase microstructure consisting of a fine dispersion of hard martensite particles in a soft pure ferrite matrix. This microstructure provides a combination of high strength, good energy absorption characteristics and ductility with good forming capabilities.
European standard EN 10336 covers continuously hot-dip and electrolytically coated strip and sheet of multiphase steels with higher yield strength for cold forming. Tata Steel Strip Products IJmuiden has developed steel according to grade HCT600X+Z/ZF (DP600GI/GA) and grade HCT780X+Z (DP800GI), which comply with the European standard EN 10336, 2007 and is developing a HCT980X+Z product. |
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Dual Phase Benefits |
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Dual Phase Steels are formable Advanced High-Strength Steels which have a high strain hardening capacity, enhancing strain redistribution and thus providing good drawability. Work hardening during forming gives a high yield strength in the finished parts. The combination of high strength and ductility and the capacity for strain hardening leads to excellent fatigue properties and good energy absorption characteristics, making these steels suitable for structural and reinforcement components particularly in the crash structure.
Furthermore, these properties can be further enhanced by strain hardening combined with a bake-hardening effect, offering an excellent potential for weight savings in structural parts. |
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Applications |
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Grades HCT600X+Z/ZF and HCT780X+Z can be used for structural and reinforcement components, such as:
- crash boxes
- support components
- A-, B- and C-pillars in cars
- box girders for chassis
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Mechanical Properties |
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The available grades have the following mechanical properties:
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European Standard
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Yield strength |
Tensile strength |
A80
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r
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n
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BH2
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EN 10336, 2007
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Sample
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Min.-Max.
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Min.
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Min.
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Min.
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Min.
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Min.
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Grade
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direction
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N/mm²
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N/mm²
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%
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N/mm²
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HCT600X+Z/ZF
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transverse
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340 - 420
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600
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201)
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-
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0.14
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30
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| HCT780X+Z |
transverse |
450 - 560 |
780 |
14 |
- |
- |
30 |
1) For galvannealed grades (ZF) the minimum elongation (A80) is lowered by 2%. |
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Chemical Composition |
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Tata Steel Strip products IJmuiden supplies the following heat analysis with maximum values in weight percentages:
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EN 10336, 2007
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C
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Mn
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Si
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P
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S
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Al
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Cr+Mo
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Nb+Ti
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Grade
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Max.
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Max.
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Max.
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Max.
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Max.
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Max.
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Max.
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Max. |
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HCT600X+Z/ZF
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0.17
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2.20
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0.80
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0.08
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0.015
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2.00
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1.00
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0.15 |
| HCT780X+Z |
0.18 |
2.50 |
0.80 |
0.08 |
0.015 |
2.00 |
1.00 |
0.15 |
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Dimensions |
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HCT600X+Z is presently available in the following dimension matrix in mm:
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Thickness
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Width
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from- up to
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Max.
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| 0.70 - 0.80 |
1300 |
| 0.80 - 0.90 |
1350 |
| 0.90 - 1.00 |
1400 |
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1.00 - 2.00
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1550
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Minimum width is 1000 mm for all grades.
Please note that the maximum dimensions in the upper left corner of the 1.00 - 2.00 matrix are defined by the line from 1.00 x 1400 mm to 1.20 x 1550 mm.
The tightest available thickness tolerances are according to the "Special" tolerances of EN 10143, 2006.
Width refers to mill edge. Side trimmed product is available on request.
For the dimensions of HCT600X+ZF please consult our representative.
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HCT780X+Z is presently available in the following dimensions in mm:
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Thickness
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Width
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from- up to
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Max.
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| 0.80 - 0.90 |
1300 |
| 0.90 - 1.00 |
1325 |
| 1.00 - 1.10 |
1350 |
| 1.10 - 1.20 |
1375 |
| 1.20 - 1.80 |
1380 |
Minimum width is 1000 mm.
HCT780X+Z in thicknesses from 1.80 mm up to 2.00 mm available after consultation. |
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