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Hot-rolled ferrite-bainite steels
Beschreibung
This range of hot-rolled high-strength steels has been developed to meet weight -reduction requirements. This family of steels extends the HSLA range of micro-alloyed steels to include products combining high tensile strength (UTS) with excellent aptitude for forming and stamping (stretch-flangeability) based on their ferritic-bainitic microstructure.
Anwendungsbereiche
These steels are cold-drawn.
The main applications are:
- Structural parts (longitudinal beams, crossmemembers, body and running-gear components)
- Wheels
- Mechanical parts (running-gear components, transmissions, etc.)
ArcelorMittal has an extensive database relating to the forming and service properties of the entire range of ferritic-bainitic steels. A team of experts is available to carry out specific studies based on modelling or laboratory tests to incorporate these steels at the design stage.
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Front and rear underseat crossmember in HR460560T-FB-GI Extragal® (thickness: 1.8 mm)
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Suspension arm in HR400Y540T-FB-UNC (thickness: 4 mm)
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Suspension arm in Extragal® HR460560T-FB-GI (thickness: 4 mm)
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Pillar reinforcement in galvanised HR460560T-FB-GI Extragal®(thickness: 1.8 mm)
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Wheel in HR440Y580T-FB
Bezeichnungen und Normen
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| ArcelorMittal-Bezeichnung | Gattungsbezeichnung | Euronorms | VDA 239-100 | JFS | ABNT NBR |
| HR300Y450T-FB | FB450 | HDT450F (+Z) | HR300Y450T-FB (-UNC,-GI) | JSH440W | FB450 |
| HR400Y540T-FB | FB540 | FB540 | |||
| HR460Y560T-FB | FB560 | ||||
| HR440Y580T-FB | FB580/FB590 | HDT580F(+Z) | HR440Y580T-FB (-UNC,-GI) | JSH590R | FB580 |
| HR480Y590T-FB-HHE | FB590HHE | HDT580F | HR440Y580T-FB (-UNC) | JSH590R |
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Euronorms
Uncoated (EN 10338: 2015): Steel grade name
Electrogalvanized (EN 10338: 2015 + EN 10152 :2017): Steel grade name+ZE
Galvannealed (EN 10346: 2015): Steel grade name+ZF
Extragal® (EN 10346: 2015): Steel grade name+Z -
VDA 239-100
Uncoated: Steel grade name-UNC
Electrogalvanised: Steel grade name-EG
Galvannealed: Steel grade name-GA
Extragal®: Steel grade name-GI
Mechanische Eigenschaften
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| ArcelorMittal-Bezeichnung | Gattungsbezeichnung | Richtung | Streckgrenze Rp0,2 (MPa) | Zugfestigkeit Rm (MPa) | Min. A(%) | Typ 1 Min. A50mm (%) | Typ 2 Min. A80mm (%) | Typ 3 Min. A50mm (%) | Min. BH2 MPa |
| HR300Y450T-FB | FB450 | RD | 300 - 400 | 450 - 550 | 27 | 25 | 24 | 26 | 30 |
| HR400Y540T-FB | FB540 | RD | 400 - 490 | 540 - 610 | 25 | 18 | 18 | 19 | 30 |
| HR460Y560T-FB | FB560 | RD | 460 - 530 | 560 - 640 | 22 | 17 | 17 | 18 | 30 |
| HR440Y580T-FB | FB580/FB590 | RD | 440 - 600 | 580 - 700 | 17 | 16 | 15 | 16 | 30 |
| HR480Y590T-FB-HHE | FB590HHE | TD | 480 - 600 | 590 - 670 | 21 | 16 | 16 | 17 | 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)
HR480Y580T-FB-HHE: we recommend this option for parts requiring very high hole expansion (HHE: High Hole Expansion grade). For this grade, the minimum guaranteed JIS elongation is 18%.
Chemische Zusammensetzung
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| ArcelorMittal-Bezeichnung | Gattungsbezeichnung | Max. C (%) | Max. Si (%) | Max. Mn (%) | Max. P (%) | Max. S (%) | Al (%) | Max. Cu (%) | Max. B (%) | Max. Ti + Nb (%) | Max. Cr + Mo (%) |
| HR300Y450T-FB | FB450 | 0,18 | 0,5 | 2,0 | 0,05 | 0,01 | 0,05 - 2,0 | 0,2 | 0,01 | 0,15 | 1 |
| HR400Y540T-FB | FB540 | 0,18 | 0,5 | 2,0 | 0,05 | 0,01 | 0,05 - 2,0 | 0,2 | 0,01 | 0,15 | 1 |
| HR460Y560T-FB | FB560 | 0,18 | 0,5 | 2,0 | 0,05 | 0,01 | 0,05 - 2,0 | 0,2 | 0,01 | 0,15 | 1 |
| HR440Y580T-FB | FB580/FB590 | 0,18 | 0,5 | 2,0 | 0,05 | 0,01 | 0,02 - 2,0 | 0,2 | 0,01 | 0,15 | 1 |
| HR480Y590T-FB-HHE | FB590HHE | 0,18 | 0,5 | 2,0 | 0,05 | 0,01 | 0,02 - 2,0 | 0,2 | 0,01 | 0,15 | 1 |
Ferritic-bainitic microstructure of HR400Y540T-FB
Globale Verfügbarkeit
In Entwicklung In Erprobung bei Kunden In Güte für nicht sichtbare Teile erhältlich In Güte für sichtbare und nicht sichtbare Teile erhältlich (Z)
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| ArcelorMittal-Bezeichnung | Gattungsbezeichnung | Unbeschichtet (-UNC) | Extragal® (-GI) | Zagnelis® Protect (-ZMP) |
| HR300Y450T-FB | FB450 | |||
| HR400Y540T-FB | FB540 | |||
| HR460Y560T-FB | FB560 | |||
| HR440Y580T-FB | FB580/FB590 | |||
| HR480Y590T-FB-HHE | FB590HHE |
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| ArcelorMittal-Bezeichnung | Gattungsbezeichnung | Unbeschichtet (-UNC) | Extragal® (-GI) | Zagnelis® Protect (-ZMP) |
| HR300Y450T-FB | FB450 | |||
| HR400Y540T-FB | FB540 | |||
| HR460Y560T-FB | FB560 | |||
| HR440Y580T-FB | FB580/FB590 | |||
| HR480Y590T-FB-HHE | FB590HHE |
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| ArcelorMittal-Bezeichnung | Gattungsbezeichnung | Unbeschichtet (-UNC) | Ultragal® (-GI) | Galvannealed (-GA) |
| HR300Y450T-FB | FB450 | |||
| HR400Y540T-FB | FB540 | |||
| HR460Y560T-FB | FB560 | |||
| HR440Y580T-FB | FB580/FB590 | |||
| HR480Y590T-FB-HHE | FB590HHE |
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| ArcelorMittal-Bezeichnung | Gattungsbezeichnung | Unbeschichtet (-UNC) | Extragal® (-GI) |
| HR300Y450T-FB | FB450 | ||
| HR400Y540T-FB | FB540 | ||
| HR460Y560T-FB | FB560 | ||
| HR440Y580T-FB | FB580/FB590 | ||
| HR480Y590T-FB-HHE | FB590HHE |
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| ArcelorMittal-Bezeichnung | Gattungsbezeichnung |
| HR300Y450T-FB | FB450 |
| HR400Y540T-FB | FB540 |
| HR460Y560T-FB | FB560 |
| HR440Y580T-FB | FB580/FB590 |
| HR480Y590T-FB-HHE | FB590HHE |
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| ArcelorMittal-Bezeichnung | Gattungsbezeichnung |
| HR300Y450T-FB | FB450 |
| HR400Y540T-FB | FB540 |
| HR460Y560T-FB | FB560 |
| HR440Y580T-FB | FB580/FB590 |
| HR480Y590T-FB-HHE | FB590HHE |
In Entwicklung
In Erprobung bei Kunden
In Güte für nicht sichtbare Teile erhältlich
In Güte für sichtbare und nicht sichtbare Teile erhältlich (Z)
Empfehlungen
High hole expansion grade
ArcelorMittal offers an HR480Y590T-FB-HHE (High Hole Expansion) grade, which is recommended for parts with sheared edge stretchability requirements (stretch flangeability, edge flanging, edge stress during secondary processing, etc.). The illustration opposite shows an example of hole expansion behaviour in accordance with the ISO standard for FB 590 and FB 590 HHE grades.
View of hole expansion in grades FB 590 and FB 590 HHE in 4 mm thickness.
The HHE achieves a much higher hole expansion value.
Forming
The graph below gives critical forming limits calculated for the Ferrite-Bainite family of steels in 2.5 mm thickness.
Please contact us for further information on forming steels in the Ferrite-Bainite range with specific thicknesses and coatings.
Schweißen
Examples of resistance spot-welding data obtained in accordance with the ISO 18278 method for coated and uncoated steels of different thicknesses in the Ferrite-Bainite product range. These steels can be arc welded.
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| ArcelorMittal-Bezeichnung | Beschichtung | Dicke (mm) | Reine Zugspannung (kN) | Schweißdurchmesser (mm) | Schubspannung (kN) |
| HR300Y450T-FB | Uncoated | 2,5 | 25 | 12 | 37 |
| HR400Y540T-FB | Uncoated | 2,5 | 30 | 12 | 42 |
| HR460Y560T-FB | Extragal® | 2,5 | 30 | 10 | 44 |
| HR480Y590T-FB-HHE | Uncoated | 2,5 | 30 | 12 | 45 |
For information only, these are some of the welding parameters used in MAG welding:
- Filler metal: GS2-type wire
- Shielding gas: ATAL 5 or ATAL 18
- Welding speed: 80 cm/min
ArcelorMittal can provide technical assistance in adjusting the welding parameters of any other steel in the Ferrite-Bainite product range.
Dauerschwingfestigkeit
Ferrite-Bainite steels have good fatigue strength on account of their high tensile strength and their microstructure.
Examples of Wöhler curves for a variety of Ferrite-Bainite steels are given in the graph below. The curves plot maximum stress versus number of cycles to failure. They are calculated for a tension-tension loading ratio of R = 0.1.
ArcelorMittal can provide a full database on the fatigue performance of Ferrite-Bainite steels.
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