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Complex Phase steels

Description

The Complex Phase family of steels supplements ArcelorMittal's AHSS (Advanced High Strength steel) product range. These steels are cold formed to make lightweight structural elements. A number of automotive parts, such as sills and door reinforcements, have simple shapes and the steel is therefore only slightly deformed. For this reason, ArcelorMittal has added the Complex Phase family of steels to its range. These steels offer high as-delivered yield strength and good bendability and stretch flangeability.

Applications

Given their high energy absorption capacity and fatigue strength, these grades are particularly well suited for automotive safety components requiring good impact strength and for suspension system components.

  • Seat flange in CR360Y590T-CP (thickness: 1.5 mm)

  • Door beam in CR780Y980T-CP (thickness: 2 mm)

  • Tunnel stiffener in CR570Y780T-CP (thickness: 1.6 mm)

  • Bumper beam in HR800Y950T-CP (roll-formed)

  • Bumper beam in HR800Y950T-CP (roll-formed)

  • Suspension arm in HR660Y760T-CP (thickness: 3.1 mm)

Designation and standard

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ArcelorMittal name Generic name Euronorms VDA 239-100
CR360Y590T-CP CP600 HCT600C (+ZE)
CR500Y780T-CP CP800Y500
CR570Y780T-CP CP800Y600 HCT780C (+ZE,+Z) CR570Y780T-CP (-UNC,-EG,-GI)
CR780Y980T-CP CP1000Y800 HCT980C (+ZE,+Z) CR780Y980T-CP (-UNC,-EG,-GI)
Show all
ArcelorMittal name Generic name Euronorms VDA 239-100
HR620Y750T-CP HR CP750 HDT750C (+Z)
HR660Y760T-CP HR CP800 HDT780C (+Z) HR660Y760T-CP (-UNC,-GI)
HR800Y950T-CP HR CP1000 HDT950C (+Z)
  • Euronorms

    Uncoated (EN 10268: 2006 + A1: 2013): Steel grade name
    Electrogalvanized (EN 10268: 2006 + A1: 2013 + EN 10152: 2017): Steel grade name + ZE
    Galvannealed (EN 10346: 2015): Steel grade name+ZF
    Extragal® (EN 10346: 2015): Steel grade name+Z
    Zagnelis® (EN 10346: 2015): Steel grade name+ZM

  • VDA 239-100

    Uncoated : Steel grade name-UNC
    Electrogalvanized : Steel grade name-EG
    Galvannealed : Steel grade name-GA
    Extragal®: Steel grade name-GI
    Zagnelis®: Steel grade name+ZM

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
CR360Y590T-CP CP600 RD 360 - 440 600 - 700 19 19 20 30
CR500Y780T-CP CP800Y500 RD 500 - 650 780 - 900 13 13 14 30
CR570Y780T-CP CP800Y600 RD 570 - 720 780 - 920 11 10 11 30
CR780Y980T-CP CP1000Y800 RD 780 - 950 980 - 1140 7 6 7 30
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. BH2 MPa
HR620Y750T-CP HR CP750 RD 620 - 750 ≥ 750 13 10 10 11 30
HR660Y760T-CP HR CP800 RD 660 - 820 760 - 960 13 11 10 11 30
HR800Y950T-CP HR CP1000 RD ≥ 800 ≥ 950 10 9 11 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)

  • Microstructure of HR660Y760T-CP

  • Microstructure of HR800Y980T-CP

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 (%)
CR360Y590T-CP CP600 0.10 0.4 1.6
CR500Y780T-CP CP800Y500 0.18 0.1 2.5 0.05 0.01 0.015 - 1.0 0.2 0.005 0.15 1
CR570Y780T-CP CP800Y600 0.18 0.1 2.5 0.05 0.01 0.015 - 1.0 0.2 0.005 0.15 1
CR780Y980T-CP CP1000Y800 0.23 0.1 2.7 0.05 0.01 0.015 - 1.0 0.2 0.005 0.15 1
Show all
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 (%)
HR620Y750T-CP HR CP750 0.25 0.4 1.4
HR660Y760T-CP HR CP800 0.18 1.0 2.2 0.05 0.01 0.015 - 1.2 0.2 0.005 0.25 1
HR800Y950T-CP HR CP1000 0.14 0.3 1.7

Global availability


Under development     Customer trials     Commercial unexposed only     Commercial exposed and unexposed    

Show all
ArcelorMittal name Generic name Uncoated (-UNC) Extragal® (-GI) Zagnelis®Protect (-ZMP) Zagnelis®Surface (-ZMS) Electrogalvanized (-EG) Jetgal® (-ZV)
CR360Y590T-CP CP600
CR500Y780T-CP CP800Y500
CR570Y780T-CP CP800Y600
CR780Y980T-CP CP1000Y800
HR620Y750T-CP HR CP750
HR660Y760T-CP HR CP800
HR800Y950T-CP HR CP1000
Show all
ArcelorMittal name Generic name Uncoated (-UNC) Extragal® (-GI) Zagnelis®Protect (-ZMP) Zagnelis®Surface (-ZMS) Electrogalvanized (-EG) Jetgal® (-ZV)
CR360Y590T-CP CP600
CR500Y780T-CP CP800Y500
CR570Y780T-CP CP800Y600
CR780Y980T-CP CP1000Y800
HR620Y750T-CP HR CP750
HR660Y760T-CP HR CP800
HR800Y950T-CP HR CP1000
Show all
ArcelorMittal name Generic name Uncoated (-UNC) Extragal® (-GI)
CR360Y590T-CP CP600
CR500Y780T-CP CP800Y500
CR570Y780T-CP CP800Y600
CR780Y980T-CP CP1000Y800
HR620Y750T-CP HR CP750
HR660Y760T-CP HR CP800
HR800Y950T-CP HR CP1000
Show all
ArcelorMittal name Generic name Uncoated (-UNC)
CR360Y590T-CP CP600
CR500Y780T-CP CP800Y500
CR570Y780T-CP CP800Y600
CR780Y980T-CP CP1000Y800
HR620Y750T-CP HR CP750
HR660Y760T-CP HR CP800
HR800Y950T-CP HR CP1000
Show all
ArcelorMittal name Generic name
CR360Y590T-CP CP600
CR500Y780T-CP CP800Y500
CR570Y780T-CP CP800Y600
CR780Y980T-CP CP1000Y800
HR620Y750T-CP HR CP750
HR660Y760T-CP HR CP800
HR800Y950T-CP HR CP1000
Show all
ArcelorMittal name Generic name Uncoated (-UNC) Extragal® (-GI)
CR360Y590T-CP CP600
CR500Y780T-CP CP800Y500
CR570Y780T-CP CP800Y600
CR780Y980T-CP CP1000Y800
HR620Y750T-CP HR CP750
HR660Y760T-CP HR CP800
HR800Y950T-CP HR CP1000

Please contact us for products under development.

Forming

Although their ultimate elongation is lower than that of DP and TRIP steels, Complex Phase steels have good formability for their high strength level.

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

Forming limit curves for Complex Phase steels:

Cold rolled in 1mm thickness (ArcelorMittal model for Europe)

Cold rolled in 1mm thickness (Keeler model for North America)

Hot rolled in 2,5 mm thickness (ArcelorMittal model for Europe)

Hot rolled in 2,5 mm thickness (Keeler model for North America)

In addition, Complex Phase steels exhibit good roll-forming, bending and hole expansion behavior.

Welding

Resistance spot welding

The Complex Phase range of steels boasts very good resistance spot weldability. The welding range, determined in accordance with the ISO 18278-2 standard, is extensive. The table below shows examples (for information only) of spot welding specifications for Complex Phase matching joints, determined in accordance with the ISO 18278-2 standards.

Show all
ArcelorMittal name Coating Thickness (mm) Nugget diameter (mm) Pure tensile (kN) Weld diameter (mm) Tensile-shear (kN)
CR360Y590T-CP 1.5 8.4 15.1 9 21.2
CR570Y780T-CP 1.5 8.7 13.2 7.6 24.2
CR780Y980T-CP 1.6 7.2 9.9 6.9 28.1
Show all
ArcelorMittal name Coating Thickness (mm) Nugget diameter (mm) Pure tensile (kN) Weld diameter (mm) Tensile-shear (kN)
HR660Y760T-CP 3 11.3 41.4 9.6 48.2
HR800Y950T-CP Extragal® 3 9.8 31.1 9.4 51.1

Laser welding

Laser welding tests have revealed no particular difficulties.

ArcelorMittal can provide technical assistance in adjusting the welding parameters for all steels in the Complex Phase range.

Fatigue strength

Complex Phase steels exhibit good fatigue properties and can be used in suspension system parts such as suspension arms. The table below gives examples of Wöhler curves for a variety of Complex Phase steels. They are expressed as stress amplitude versus cycles to failure and are obtained with a stress ratio of R = 0.1 and repeated tensile loading.

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 upon request.

ArcelorMittal can provide a full database on the fatigue performance of Complex Phase steels.

Impact strength

As a result of their very high YS and UTS values, Complex Phase steels are particularly well suited for anti-intrusion parts.

Complex Phase steels have been characterized in the 3-point bending flex test using top hat cross-section specimens impacted at 30 kph. The tests showed very good behavior of these steels.

Weight-saving potential compared to CR340LA steel (reference)

Weight-saving potential compared to CR340LA steel (reference)

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