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High strength IF steels

Description

These steels have been designed to provide an excellent combination of drawability and mechanical strength based on their specific interstitial-free (IF) metallurgy.

These steels are hardened by adding manganese, silicon and phosphorous in solid solution to the ferrite. The metallurgy of IF steels optimises their drawability. Their low YS/UTS ratio and high strain-hardening coefficient or n-value gives them excellent suitability for deep-drawing and good strain distribution. Their high anisotropy coefficient or R-value translates into good necking behaviour, which also beneficial to deep-drawing.

These steels are particularly suitable for complex parts requiring high mechanical strength at the same time, such as wheel arches, toe-boards, reinforcements, etc. Their high strain-hardening potential during forming gives them good dent resistance on deep-drawn parts luggage compartments, tailgates, doors, linings, wheel arches, etc.). CR180IF to CR240IF grades can be used, with certain coatings, to manufacture visible parts such as door panels. CR270IF grade is designed for more complex structural parts (longitudinal beams, cross members, suspension and chassis components, etc.).

Applications

With their high mechanical strength ensuring good fatigue and impact resistance, these steels are intended for structural parts (longitudinal beams, cross members, B-pillars, etc.) as well as for skin parts, where they provide good dent resistance.

Compared to conventional drawing grades, the weight reduction potential of these products increases with drawing depth.

Bonnet in CR210IF-GI Extragal® (thickness: 0.7 mm)

Bonnet in CR210IF-GI Extragal® (thickness: 0.7 mm)

Designation and standard

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ArcelorMittal name Generic name Euronorms VDA 239-100 JFS ABNT NBR
CR180IF IF180 HC180Y (+ZE) / HX180YD (+Z, +ZF, +ZM) CR180IF (-UNC,-EG,-GI,-GA,-ZM) IFAR-180 / ZARIF-180
CR210IF IF210 / IF220 HC220Y (+ZE) / HX220YD (+Z, +ZF, +ZM) CR210IF (-UNC,-EG,-GI,-GA,-ZM) JSC340P / JAC340P / JEC340P IFAR-210 / ZARIF-210
CR240IF IF240 / IF260 HC260Y (+ZE) / HX260YD (+Z, +ZF, +ZM) CR240IF (-UNC,-EG,-GI,-GA,-ZM) IFAR-240 / ZARIF-240
CR280IF IF280 / IF300 HX300YD (+Z, +ZF, +ZM) IFAR-270 / ZARIF-270
  • Euronorms

    Uncoated (EN 10268: 2006 + A1: 2013): Steel grade name
    Electrogalvanised (EN 10268: 2006 + A1: 2013 + EN 10152: 2017): Steel grade name+ZE
    Galvannealed (EN 10346: 2015): Steel grade name+ZF
    Extragal®/Ultragal® for visible parts (EN 10346: 2015): Steel grade name+Z
    Zagnelis® (EN 10346: 2015): Steel grade name+ZM 

  • VDA 239-100

    Uncoated: Steel grade name-UNC
    Electrogalvanised: Steel grade name-EG
    Galvannealed: Steel grade name-GA
    Extragal®/Ultragal® for visible parts: Steel grade name-GI
    Zagnelis®: Steel grade name-ZM

While the ArcelorMittal grades conform perfectly well to the indicated EN standards, ArcelorMittal grades generally offer tighter mechanical properties (see table below).

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

Mechanical properties

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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. r0-20 Min. rm-20 n10-20/Ag
CR180IF IF180 RD 180 - 240 320 - 400 38 35 38 1.2 1.3 0.19
CR210IF IF210 / IF220 RD 210 - 270 340 - 420 36 33 36 1.1 1.3 0.18
CR240IF IF240 / IF260 RD 240 - 300 360 - 440 33 31 33 1 1.2 0.17
CR280IF IF280 / IF300 RD 280 - 340 ≥ 385 30 29 31 1 1.1 0.15

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)

Chemical composition

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ArcelorMittal name Generic name Max. C (%) Max. Si (%) Max. Mn (%) Max. P (%) Max. S (%) Min. Al (%) Max. Ti (%) Max. Nb (%) Max. Cu (%)
CR180IF IF180 0.01 0.3 0.7 0.06 0.025 ≥ 0.01 0.12 0.09 0.2
CR210IF IF210 / IF220 0.01 0.3 0.9 0.08 0.025 ≥ 0.01 0.12 0.09 0.2
CR240IF IF240 / IF260 0.01 0.3 1.0 0.1 0.025 ≥ 0.01 0.12 0.09 0.2
CR280IF IF280 / IF300 0.01 0.3 1.0 0.1 0.025 ≥ 0.01 0.12 0.09 0.2

Global availability


Under development     Customer trials     Commercial unexposed only     Commercial exposed and unexposed    

Show all
ArcelorMittal name Generic name Uncoated (-UNC) Extragal® (-GI) Ultragal® (-GI) Galvannealed (-GA) Zagnelis® Protect (-ZMP) Zagnelis® Surface (-ZMS) Electrogalvanized (-EG)
CR180IF IF180
CR210IF IF210 / IF220
CR240IF IF240 / IF260
CR280IF IF280 / IF300
Show all
ArcelorMittal name Generic name Uncoated (-UNC) Extragal® (-GI) Ultragal® (-GI) Galvannealed (-GA) Zagnelis® Protect (-ZMP) Zagnelis® Surface (-ZMS) Electrogalvanized (-EG)
CR180IF IF180
CR210IF IF210 / IF220
CR240IF IF240 / IF260
CR280IF IF280 / IF300
Show all
ArcelorMittal name Generic name Uncoated (-UNC) Extragal® (-GI) Galvannealed (-GA) Electrogalvanized (-EG)
CR180IF IF180
CR210IF IF210 / IF220
CR240IF IF240 / IF260
CR280IF IF280 / IF300
Show all
ArcelorMittal name Generic name Uncoated (-UNC) Extragal® (-GI) Galvannealed (-GA)
CR180IF IF180
CR210IF IF210 / IF220
CR240IF IF240 / IF260
CR280IF IF280 / IF300
Show all
ArcelorMittal name Generic name
CR180IF IF180
CR210IF IF210 / IF220
CR240IF IF240 / IF260
CR280IF IF280 / IF300
Show all
ArcelorMittal name Generic name Uncoated (-UNC) Extragal® (-GI) Galvannealed (-GA)
CR180IF IF180
CR210IF IF210 / IF220
CR240IF IF240 / IF260
CR280IF IF280 / IF300
Microstructure of CR180IF grade

Microstructure of CR180IF grade

Forming

IF steels offer excellent drawability for their mechanical strength level. This behaviour is associated with very good elongation at rupture, very good strain-hardening coefficient and normal anisotropy.

The diagram opposite shows examples of forming limit curves for the IF family of steels in 1.00 mm thickness.

Forming limit curves for the IF steels family (ArcelorMittal model for Europe)

Forming limit curves for the IF steels family (Keeler model for North America)

ArcelorMittal has an extensive database on the forming of IF steels. To incorporate these steels as from the design stage, a team of experts is available to carry out specific forming studies based on modelling or shop-floor experience.

Welding

IF steels can be readily welded by all welding processes.

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