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Hot-rolled ferrite-bainite steels

Description

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.

Applications

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.

  • Front and rear underseat crossmember in HR460560T-FB-GI Extragal® (thickness: 1.8 mm)

  • Suspension arm in HR400Y540T-FB-UNC (thickness: 4 mm)

  • Suspension arm in Extragal® HR460560T-FB-GI (thickness: 4 mm)

  • Pillar reinforcement in galvanised HR460560T-FB-GI Extragal®(thickness: 1.8 mm)

  • Wheel in HR440Y580T-FB

Designation and standard

Show all
ArcelorMittal name Generic name Euronorms VDA 239-100 JIS
HR300Y450T-FB FB450 HDT450F (+Z) HR300Y450T-FB (-UNC,-GI) JSH440W
HR400Y540T-FB FB540
HR460Y560T-FB FB560
HR440Y580T-FB FB580/FB590 HDT580F(+Z) HR440Y580T-FB (-UNC,-GI) JSH590R
HR480Y590T-FB-HHE FB590HHE HDT580F HR440Y580T-FB (-UNC) JSH590R
  • 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

Mechanical properties

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ArcelorMittal name Generic name Direction Yield stress Rp0.2 (MPa) Tensile strength Rm (MPa) Min. A(%) Type 1 Min. A50mm (%) Type 2 Min. A80mm (%) Type 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%.

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 (%)
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

Ferritic-bainitic microstructure of HR400Y540T-FB

Global availability


Under development     Customer trials     Commercial unexposed only     Commercial exposed and unexposed    

Show all
ArcelorMittal name Generic name Uncoated (-UNC) Extragal® (-GI) Galvannealed (-GA) Zagnelis® Protect (-ZMP)
HR300Y450T-FB FB450
HR400Y540T-FB FB540
HR460Y560T-FB FB560
HR440Y580T-FB FB580/FB590
HR480Y590T-FB-HHE FB590HHE
Show all
ArcelorMittal name Generic name Uncoated (-UNC) Extragal® (-GI) Zagnelis® Protect (-ZMP)
HR300Y450T-FB FB450
HR400Y540T-FB FB540
HR460Y560T-FB FB560
HR440Y580T-FB FB580/FB590
HR480Y590T-FB-HHE FB590HHE
Show all
ArcelorMittal name Generic name Uncoated (-UNC) Galvannealed (-GA)
HR300Y450T-FB FB450
HR400Y540T-FB FB540
HR460Y560T-FB FB560
HR440Y580T-FB FB580/FB590
HR480Y590T-FB-HHE FB590HHE
Show all
ArcelorMittal name Generic name Uncoated (-UNC) Extragal® (-GI)
HR300Y450T-FB FB450
HR400Y540T-FB FB540
HR460Y560T-FB FB560
HR440Y580T-FB FB580/FB590
HR480Y590T-FB-HHE FB590HHE
Show all
ArcelorMittal name Generic name
HR300Y450T-FB FB450
HR400Y540T-FB FB540
HR460Y560T-FB FB560
HR440Y580T-FB FB580/FB590
HR480Y590T-FB-HHE FB590HHE
Show all
ArcelorMittal name Generic name
HR300Y450T-FB FB450
HR400Y540T-FB FB540
HR460Y560T-FB FB560
HR440Y580T-FB FB580/FB590
HR480Y590T-FB-HHE FB590HHE

Recommendations

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.<br/>The HHE achieves a much higher hole expansion value.

View of hole expansion in grades HR440Y580T-FB and HR480Y590T-FB-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.

Welding

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.

Show all
ArcelorMittal name Coating Thickness (mm) Pure tensile (kN) Weld diameter (mm) Tensile-shear (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.

Fatigue strength

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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