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High formability steels for drawing

Description

This range of non-alloyed mild steels is designed for deep and extra-deep drawing applications. These products are used extensively in the automotive industry, for both visible and structural parts. The guaranteed low scatter in their mechanical properties ensures optimum productivity in drawing press operations.

The range of cold-rolled steels has been extended to include the ultra high-drawability CR6 grade, ensuring maximum efficiency in forming the most difficult parts (body sides, door liners, tailgates, etc.).

These high formability steel grades are non-ageing, conserving their mechanical properties and their formability over time. 

The high formability steel range offers better guarantees than the usual standard-compliant drawing steels, while remaining compatible with these standards.

Applications

These steels are designed for deep and extra deep drawing of visible and structural parts.

  • Door lining in CR3-GI Extragal® (thickness: 0.7 mm)

  • Load compartment floor in CR3-GI Extragal® (thickness: 0.7 mm)

  • Wheel arch in CR5-GI Extragal® (thickness: 0.9 mm)

  • Crankcase in CR5-GI Extragal® (thickness: 1 mm)

Designation and standard

These cross-references are given for information only. These high-formability grades generally offer guarantees of tighter mechanical properties

Show all
ArcelorMittal name Generic name Euronorms VDA 239-100 JFS ABNT NBR
CR DC01/DX51 DC01 (+ZE) / DX51D (+Z, +ZF)
CR1 CR1 DX52D (+Z, +ZF) CR1 (-UNC,-EG,-GI,-GA) JSC270C / JAC270C / JEC270C EM / ZM
CR2 CR2 DC03 (+ZE) / DX53D (+Z, +ZF, +ZM) CR2 (-UNC,-EG,-GI,-GA,-ZM) JSC270D / JAC270D / JEC270D EP / ZE
CR3 CR3 DC04 (+ZE) / DX54D (+Z, +ZF, +ZM) CR3 (-UNC,-EG,-GI,-GA,-ZM) JSC270E / JAC270E / JEC270E EEP Grau 1 / ZEE Grau 1
CR4 CR4 DC05 (+ZE) / DX56D (+Z, +ZF, +ZM) CR4 (-UNC,-EG,-GI,-GA,-ZM) JSC270F / JAC270F / JEC270F EEP Grau 2 / ZEE Grau 2
CR5 CR5 DC06 (+ZE) / DX57D (+Z, +ZF, +ZM) CR5 (-UNC,-EG,-GI,-GA,-ZM) EEP Grau 3 / ZEE Grau 3
CR6 CR6 DC07 (+ZE) CR6 (-UNC,-EG) JSC260G / JEC260G EEP Grau 4 / ZEE Grau 4
Show all
ArcelorMittal name Generic name Euronorms VDA 239-100 JFS ABNT NBR
HR0 HR0 DD11 EM
HR1 HR1 DD12
HR2 HR2 DD13 HR2 (-UNC,-GI) EP
HR3 HR3 DD14 JSH270C EPA
HR4 HR4 JSH270D
  • Euronorms

    Uncoated (EN 10130: 2006): Steel grade name
    Electrogalvanised (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
    Uncoated HR (EN 10111: 2008): Steel grade name

  • 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

The above tables (for information only) summarise the cross-references between the high-formability steel range, European standards and the VDA 239-100 standard.

Mechanical properties

These steels have enhanced drawability properties as a result of minimal scatter in their chemical composition and mechanical properties, ensuring consistent behaviour during secondary processing.

Show all
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. r0-20 Min. rm-20 Min. n10-20/Ag
CR DC01/DX51 TD ≥ 270 24 22 24
CR1 CR1 TD 140 - 300 270 - 410 30 28 30
CR2 CR2 TD 140 - 240 270 - 370 34 34 37 1.3 1.2 0.16
CR3 CR3 TD 140 - 210 270 - 350 38 38 41 1.8 1.5 0.18
CR4 CR4 TD 140 - 180 270 - 330 40 39 42 1.9 1.6 0.20
CR5 CR5 TD 110 - 170 260 - 330 42 41 46 2.1 1.8 0.22
CR6 CR6 TD 110 - 170 260 - 330 44 43 47 2.3 2.0 0.23
Show all
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. r0-20 Min. rm-20 Min. n10-20/Ag
HR0 HR0 TD 240 - 350 310 - 460 28 26 22 24 0.12
HR1 HR1 TD 200 - 330 300 - 420 32 29 27 29
HR2 HR2 TD 180 - 290 270 - 400 34 32 30 33 0.16
HR3 HR3 TD 180 - 290 270 - 400 37 35 33 36
HR4 HR4 TD 180 - 260 270 - 350 40 35 33 36

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)

Interstitial-free (IF) metallurgy is systematically used to produce CR5-UNC/-EG and CR6-UNC/-EG. This type of metallurgy is also required for the hot-dip coated (Extragal® and Galvannealed) versions of CR3 and CR4.

Microstructure of CR4 (IF-Ti B type metallurgy)

Microstructure of CR4 (IF-Ti B type metallurgy)

Chemical composition

Show all
ArcelorMittal name Generic name Max. C (%) Max. Si (%) Max. Mn (%) Max. P (%) Max. S (%) Min. Al (%) Max. Ti (%) Max. Cu (%)
CR DC01/DX51 0.12 0.5 0.6 0.1 0.045
CR1 CR1 0.12 0.5 0.6 0.055 0.035 ≥ 0.01 0.3 0.2
CR2 CR2 0.1 0.5 0.5 0.025 0.02 ≥ 0.01 0.3 0.2
CR3 CR3 0.08 0.5 0.5 0.025 0.02 ≥ 0.01 0.3 0.2
CR4 CR4 0.06 0.5 0.4 0.025 0.02 ≥ 0.01 0.3 0.2
CR5 CR5 0.02 0.5 0.3 0.02 0.02 ≥ 0.01 0.3 0.2
CR6 CR6 0.01 0.5 0.2 0.02 0.02 ≥ 0.01 0.2 0.2
Show all
ArcelorMittal name Generic name Max. C (%) Max. Si (%) Max. Mn (%) Max. P (%) Max. S (%) Min. Al (%) Max. Ti (%) Max. Cu (%)
HR0 HR0 0.13 0.5 0.6 0.035 0.03 ≥ 0.015 0.3 0.2
HR1 HR1 0.12 0.5 0.5 0.025 0.03 ≥ 0.015 0.3 0.2
HR2 HR2 0.12 0.5 0.5 0.025 0.03 ≥ 0.015 0.3 0.2
HR3 HR3 0.08 0.1 0.4 0.02 0.02 ≥ 0.02 0.3 0.2
HR4 HR4 0.08 0.1 0.4 0.02 0.02 ≥ 0.02 0.3 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)
CR DC01/DX51
CR1 CR1
CR2 CR2
CR3 CR3
CR4 CR4
CR5 CR5
CR6 CR6
HR0 HR0
HR1 HR1
HR2 HR2
HR3 HR3
HR4 HR4
Show all
ArcelorMittal name Generic name Uncoated (-UNC) Extragal® (-GI) Ultragal® (-GI) Galvannealed (-GA) Zagnelis® Protect (-ZMP) Zagnelis® Surface (-ZMS) Electrogalvanized (-EG)
CR DC01/DX51
CR1 CR1
CR2 CR2
CR3 CR3
CR4 CR4
CR5 CR5
CR6 CR6
HR0 HR0
HR1 HR1
HR2 HR2
HR3 HR3
HR4 HR4
Show all
ArcelorMittal name Generic name Uncoated (-UNC) Extragal® (-GI) Galvannealed (-GA) Electrogalvanized (-EG)
CR DC01/DX51
CR1 CR1
CR2 CR2
CR3 CR3
CR4 CR4
CR5 CR5
CR6 CR6
HR0 HR0
HR1 HR1
HR2 HR2
HR3 HR3
HR4 HR4
Show all
ArcelorMittal name Generic name Uncoated (-UNC) Extragal® (-GI) Galvannealed (-GA) Electrogalvanized (-EG)
CR DC01/DX51
CR1 CR1
CR2 CR2
CR3 CR3
CR4 CR4
CR5 CR5
CR6 CR6
HR0 HR0
HR1 HR1
HR2 HR2
HR3 HR3
HR4 HR4
Show all
ArcelorMittal name Generic name Uncoated (-UNC) Electrogalvanized (-EG)
CR DC01/DX51
CR1 CR1
CR2 CR2
CR3 CR3
CR4 CR4
CR5 CR5
CR6 CR6
HR0 HR0
HR1 HR1
HR2 HR2
HR3 HR3
HR4 HR4
Show all
ArcelorMittal name Generic name Uncoated (-UNC) Extragal® (-GI) Galvannealed (-GA)
CR DC01/DX51
CR1 CR1
CR2 CR2
CR3 CR3
CR4 CR4
CR5 CR5
CR6 CR6
HR0 HR0
HR1 HR1
HR2 HR2
HR3 HR3
HR4 HR4

Forming

This family of  steels has high and even very high drawability in all deformation modes (low yield strength and high ductility and normal strain ratio). They can be used to manufacture complex parts incorporating several functions, synonymous with cost savings.

Forming limit curves can be used to define the maximum strain without necking for different deformation paths.

Examples of forming limit curves calculated for CR2 to CR6 (thickness: 1.0 mm) (ArcelorMittal model for Europe)

Examples of forming limit curves calculated for CR2 to CR6 (thickness: 1.0 mm) (Keeler model for North America)

Welding

Due to their low alloy content, drawing steels can be readily welded by all conventional welding processes.

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