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Steels for cold stamping - Fortiform®

Description

The family of Fortiform® steels extends ArcelorMittal's range of Ultra High Strength Steels (UHSS). These steels allow the realization of lightweight structural elements by a cold forming method such as stamping. These Ultra High Strength Steels of third generation are used to provide additional weight reduction thanks to their higher mechanical properties than conventional Advanced High Strength Steels (AHSS) while keeping the same formability.

Position of Fortiform® steels in the ArcelorMittal steel range

Position of Fortiform® steels in the ArcelorMittal steel range

Applications

Thanks to their excellent mechanical properties, these grades are particularly suitable for automotive safety parts intended for crash resistance.

Typical parts for Fortiform® steels

Typical parts for Fortiform® steels

Designation and standard

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ArcelorMittal name Generic name ArcelorMittal Code VDA 239-100
Fortiform® 980 HF980Y600 Fortiform® 980
Fortiform® 1050 HF1050Y700 Fortiform® 1050 CR700Y980T-DH (-UNC,-EG)
Fortiform® 1180 HF1180Y850 Fortiform® 1180

The above indicative table summarizes the European and VDA standards corresponding to the ArcelorMittal product range.

Mechanical properties

Show all
ArcelorMittal name Generic name Direction Yield stress Rp0.2 (MPa) Tensile strength Rm (MPa) Type 1 Min. A50mm (%) Type 2 Min. A80mm (%) Type 3 Min. A50mm (%) Min. BH2 MPa
Fortiform® 980 HF980Y600 RD 600 - 750 980 - 1130 19 19 20 30
Fortiform® 1050 HF1050Y700 RD 700 - 820 1050 - 1180 14 14 15 30
Fortiform® 1180 HF1180Y850 RD 850 - 1060 1180 - 1330 13 13 14 30

A80mm %: Percentage elongation after fracture using a specimen with gauge length L0 = 80 mm (ISO 6892-1 type 2 (EN20x80))
A50mm %: Percentage elongation after fracture using a specimen with gauge length L0 = 50 mm (ISO 6892-1 type 1 (ASTM12.5x50) or type 3 (JIS25x50)
A%: Percentage elongation after fracture using a proportional specimen with L0 = 5.65 (So)1/2
Ag %: Percentage plastic extension at maximum force
BH2: Increase in yield strength between a reference condition after a 2% plastic pre-strain and the condition obtained after heat treatment (170°C-20minutes)

Fortiform® 1050 microstructure

Fortiform® 1050 microstructure

Chemical composition

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ArcelorMittal name Generic name Max. C (%) Max. Si (%) Max. Mn (%) Max. P (%) Max. S (%) Al (%) Max. Cu (%) Max. B (%) Max. Ti + Nb (%) Max. Cr + Mo (%)
Fortiform® 980 HF980Y600 0.25 2.0 2.3 0.05 0.01 0.015 - 1.0 0.2 0.005 0.15 1.4
Fortiform® 1050 HF1050Y700 0.23 1.8 2.3 0.05 0.01 0.015 - 1.0 0.2 0.005 0.15 1.4
Fortiform® 1180 HF1180Y850 0.23 2.0 2.8 0.05 0.01 0.015 - 1.0 0.2 0.005 0.15 1.4

Global availability


Under development     Customer trials     Commercial unexposed only     Commercial exposed and unexposed    

Show all
ArcelorMittal name Generic name Uncoated (-UNC) Alusi® (-AS) Extragal® (-GI) Galvannealed (-GA) Electrogalvanized (-EG) Jetgal® (-ZV)
Fortiform® 980 HF980Y600
Fortiform® 1050 HF1050Y700
Fortiform® 1180 HF1180Y850
Show all
ArcelorMittal name Generic name Uncoated (-UNC) Extragal® (-GI) Electrogalvanized (-EG) Jetgal® (-ZV)
Fortiform® 980 HF980Y600
Fortiform® 1050 HF1050Y700
Fortiform® 1180 HF1180Y850
Show all
ArcelorMittal name Generic name Uncoated (-UNC) Extragal® (-GI) Galvannealed (-GA)
Fortiform® 980 HF980Y600
Fortiform® 1050 HF1050Y700
Fortiform® 1180 HF1180Y850
Show all
ArcelorMittal name Generic name
Fortiform® 980 HF980Y600
Fortiform® 1050 HF1050Y700
Fortiform® 1180 HF1180Y850
Show all
ArcelorMittal name Generic name
Fortiform® 980 HF980Y600
Fortiform® 1050 HF1050Y700
Fortiform® 1180 HF1180Y850
Show all
ArcelorMittal name Generic name
Fortiform® 980 HF980Y600
Fortiform® 1050 HF1050Y700
Fortiform® 1180 HF1180Y850

Please contact us for products under development.

Forming

Fortiform® steels exhibit very good ductility compared with their level of tensile strength.

The figure below shows an example of forming limit curve for Fortiform® steels 1,5 mm thick.

Forming limit curves for the Fortiform® steel family of 1,5mm thickness (ArcelorMittal model for Europe)

Forming limit curves for the Fortiform® steel family of 1,5mm thickness (Keeler model for North America)

Welding

Resistance Spot Welding

Fortiform® steels are weldable using conventional processes by adapting the parameters.

Given the increase of the carbon equivalent, it is necessary to increase welding force and adapt welding cycles to achieve good spot-weld quality.

For information, here is an example of welding data on Fortiform® 1050 EG steel based on matching joints in accordance with the ISO 18278-2 standard:

Show all
ArcelorMittal name Coating Thickness (mm) Pure tensile (kN) Weld diameter (mm) Tensile-shear (kN)
Fortiform® 1050 Electrogalvanized 0.8 3 6 10

Fatigue strength

Fortiform® steels exhibit excellent fatigue properties on account of their very high mechanical strength. By way of example, the two graphs below show Wöhler curves for Fortiform® steels. The curves plot maximum stress versus number of cycles to failure. They are obtained for two loading ratios: tension-compression R=-1 and tension-tension R=0.1.

The graph below shows the low cycle or EN curves for the same steels. These are expressed as strain amplitude versus number of reversals (one cycle equals two reversals). Other high and low cycle fatigue data are available on request.

ArcelorMittal can provide its customers with a database on the fatigue performance of Fortiform® steels.

Impact strength

As a result of their very high yield and breaking strength, Fortiform® 1050 steel is particularly suitable for safety parts.

Fortiform® steels have been characterized in dynamic axial compression tests using an omega structure with a spot-welded closure plate at an impact velocity of 56 kph. These tests have demonstrated the very positive impact behaviour of these steels. By way of information, the graph below shows the minimum weight-saving potential with these steels relative to a CR340LA steel.

Weight-saving potential relative to a CR340LA steel (reference)

Weight-saving potential relative to a CR340LA steel (reference)

Fortiform® steels have been characterized in a 3-point bending test using top hat cross-section test-pieces impacted at 30 kph. The tests showed excellent behaviour by these steels. By way of information, the graph below shows the minimum weight-saving potential with these steels relative to a CR340LA steel.

Weight-saving potential relative to a CR340LA steel (reference)

Weight-saving potential relative to a CR340LA steel (reference)

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