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Advanced High Strength Steels: an economical solution for Automotive Lightweight Structures. Advanced High Strength Steels: inside an extended steel grade offer for Automotive. Automotive Steel Families. Advanced High Strength Steels: Massive and Growing use in the Automotive Industry.

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slide5

Advanced High Strength SteelsEstimated Market needs

  • AHSS usage will grow
  • from 7% in 2006 to 11% in 2010, mainly at HSS expenses
  • A long term potential of
  • 35% of AHSS in a BIW
  • has been estimated through a model study

> 1 Mt in Europe

> 3 Mt in Europe

slide6

Car Example

32% AHSS

46% AHSS

Eu 4x4 – new model

Eu 4x4 – previous model

Source: Eurocarbody

Source EuroCarBody 2007

slide8

AHSS are dedicated to Structural parts

A-frame reinf.

Bumper Beam

Roof bow

B-pillar reinforcement

Front side members

Floor side reinf. - sill inner

Rear side member

WHY DOES THE NEED OF AHSS INCREASE ?

  • Reduce CO2 emissions
  • Reduce fuel consumption
  • Safety requirements
  • Equipment & Comfort
  • Downgauging
  • compensate by higher crash performances of steel
  • Cost effective

Car structure

mass

reduction

AHSS

example in brazil
Example in Brazil

Euroncap test as illustration

FRONTAL Crash regulation in 2010

=> would increase need of AHSS

car crash situations
Car crash situations

Situation where need is to control absorbed energy

Situation where need is to control intrusion (displacement)

slide11

AM test for:Energy absorption under compressive load

Closed-Top-Hat

test conditions

Sample

Final specimen observation

Records

slide12

Energy Absorption

Average crushing force for 1.5mm thickness

H260

DP980LCE

DP450

DP500

DP600

DP780

MP800

MS1200

TRIP980

MP1000

TRIP590

TRIP690

TRIP780

HSLA500

DP1180HY

ArcelorMittal 04

  • Increased energy absorption with higher UTS
  • Ranking made at iso-part geometry
slide13

AM test for:Maximal Load under 3P bending.

Sample

test conditions: 3 point bending

records

45

Impactor

f

50

Maximum force

(ulitmate failure stress)

Yield force

f

200

Force (kN)

50

Support

700

Displacement (mm)

100

75

300

480

30

140

Impact speed: 8 m/s

Kinetic energy : 10 kJ

Final specimen observation

slide14

H260

DP980LCE

DP450

DP500

DP600

DP780

MP800

MS1200

TRIP980

MP1000

TRIP590

TRIP690

TRIP780

HSLA500

DP1180HY

ArcelorMittal 04

Usibor 1500

  • Increased anti-intrusion with higher UTS
  • Ranking made at iso-part geometry

max crushing force for 1.5mm thickness

slide15
Strategic Interest in Advanced High Strength Steels (AHSS) for Automotive business is no more a question
  • Because it is the most economically efficient solution to reach:
  • Lightweighting goals in structural areas of the car
  • Safety goals in the safety-critical parts
  • Reduce complexity of stamped parts
example of weight saving in automotive parts am generic steel solution catalogue for bodyside
Example of Weight saving in Automotive parts: AM generic steel solution catalogue for Bodyside

Reference : 5 doors European vehicle

“Bodyside” Scope

in the solutions catalogue 1 very efficient proposal for weight saving
In the “solutions” catalogue: 1 very efficient proposal for weight saving

ROOF RAIL INNER :

DP980HY 0.7mm

A-PILLAR Upper INNER :

Trip 780 1.25mm

ROOF RAIL R/F

DP780 0.6mm

A-PILLAR Upper R/F :

Usibor 0.9mm

Reference

A-PILLAR Lower INNER DP600 0.8mm

B-PILLAR TWB INNER :

DP980 HY 1.0 (up)

ARC04 0.7 (low)

B-PILLAR R/F TWB Usibor 2mm (up)

Ductibor 1.6mm (low)

This solution

A-PILLAR R/F Usibor 0.9mm

Cost : +10%

Weight saving : -25%

ROCKER INNER DP980HY 0.85mm

ROCKER R/F RR + ROCKER R/F FR : DP980 HY 0.85mm

slide20

AHSS = MULTIPHASE STEELS

Strengthening by quenching generated hard phases: martensite, bainite, retained austenite

Conventional = ferritic

Martensitic

DP

TRIP

1000 : 1 Le Pera

20 µm

MP or CP

Ferrite Bainite

slide21

AHSS = produced by conventional process

Run out table

Cooling and coiling

Continous casting

Slabs 25 t

Steelmaking

230 t

Hot Rolling mill

Coils, 25t, length 1000 m

Hot Dip

Galvaninzing

line

Hot Dip galvaninzing

product

(coils, length 2000 m)

Cold rolling mill

slide22

Metallurgy of ArcelorMittalAHSS

MULTIPHASE structure  Manage phase transformation Coupled key factors: PROCESS and CHEMICAL COMPOSITION

PROCESS = control the structure at high temperature + the continuous cooling

strip temperature

« Conventional » steels

TRIP steels

CGL or CAL

DP steels

time (s)

Area of ferrite formation during cooling

Adjusted by chemical composition and processing

Area of Bainite formation during cooling

Area of Martensite formation during cooling

slide23

ArcelorMittal WW AHSS offer

FB

FB

DP

DP

TRIP

TRIP

XIP

DP

DP FB

FB

DP

EUR

FB

PH

DP

MP

NAM

DP

DP

Mart

MP

FB

TRIP

DP

FB

PH

PH

DP FB MP

FB

SAM

MP

FB

DP

DP : Dual Phase (&CP)

MP: MultiPhase (CP)

Mart : Martensitic grade

EUR: Europe

PH: Press Hardening grade

NAM: North America

FB : Ferrite bainite

TRIP : Transformation Induced Plasticity

SAM: South America

example of ww offer processus arcelormittal ahss in brazil

CommercialUnexposed only

CommercialExp. and Unexp.

Customer Trials

Under Development

Hot Rolled

Cold Rolled

Example of WW offer processus: ArcelorMittal AHSS in Brazil

Concept and Know-How are transfered from original region (Eu, US) to Brazil Plant with total technical support => OEM gets locally an equivalent product compared to the original region

Generic

Y/T

EUR & SAM Grade

NAM Grade

UC

EG

GI

GA

AS

ZA/AZ

DP450

T

450

EUR

EUR

EUR

EUR

DP500

T

500

490

EUR

NAM

EUR

NAM

EUR

NAM

NAM

DP590

T

600

590-600

EUR

NAM

SAM

EUR

EUR

DP780HFL

T

780HFL

T

EUR

NAM

EUR

NAM

EUR

NAM

SAM

EUR

NAM

SAM

DP590

600

590-600

Dual Phase

NAM

T

DP590 HHE

600 HHE

590R

EUR

EUR

NAM

NAM

T

DP690 HHE

HFT690

T

NAM

NAM

EUR

NAM

SAM

SAM

EUR

NAM

SAM

DP780

780

780

T

DP780 HHE

780 HHE

EUR

EUR

NAM

T

EUR

EUR

DP780 LCE

780 LCE

780 LCE

FB450

T

450

EUR

SAM

EUR

FB540

T

540

540SF

EUR

SAM

EUR

NAM

Ferrite-Bainite

FB560

T

560

EUR

NAM

FB590

T

590

EUR

SAM

T

590SF

FB590 HHE

590 HHE

EUR

NAM

SAM

MP800

T

800

EUR

NAM

EUR

Multi-Phase

HFL: High Fatigue Life, HHE: High Hole Expansion, LCE:Low Carbon Equivalent

example of ww offer processus arcelormittal ahss in brazil1
Example of WW offer processus: ArcelorMittal AHSS in Brazil

Example: Transfer DP600GI from Europe to Brazil (VEGA do Sul)

arcelormittal keeps on developing the ahss family
ArcelorMittal keeps on developing the AHSS family
  • Because:
  • OEM needs are already growing for 1000MPa and above grades.
  • At these levels, Steelmaker and OEM must, together, overcome increasing difficulties in part forming, part welding and other in-use properties.
dp980 with excellent formability bending combination good weldability
Development in Europe and America with Low C/Low CEQ

of a new DP980 with low C content & improved drawability :

Toward low Ceq ~ 0.28-> ~ 0.23

Increase drawability : min 0.5t Bendability, +30% Hole Expansion, Robust Weldability

Excellent Combination of Properties:

YS 650 MPa, TS 1020 MPa, TE 12-17% (Gauge dependent)

Qualified at Multiple Auto Manufacturers

Utilized in Vehicles beginning Model Year 2009

Applications include B-Pillars, Cross-members, Seat Parts

DP980LCE

DP980LCE

DP980 with excellent formability/bending combination + good weldability

B-Pillar

Cross-members

mp800hy a hr 800mpa steel with good stretch flangeability3

initial = 10mm

 = 45mm

MP800HY, a HR 800MPa steel with good stretch flangeability
  • Good bendability:
    • Whatever the thickness is
    • similar behaviour in rolling and transverse direction
  • Conical hole expansion :
    • Around 60% in average
    • Development of 85% HE
  • Dome stretching underlines good formability.
  • Very good weldability

Punch diameter : 75mm

arcelormittal ahss steels 1000 mpa for roll forming bending
DP 1180HY

Mid-carbon steel

YS ~950MPa, TS ~1200MPa, TE ~5% (ISO)

Minimum bend radius of 2t

Martensite 1100 / 1300 / 1500

Lean alloying (C, 0.5Mn)

YS ~1000/1150/1300MPa, TS ~1180/1380/1550MPa, TE >3%

Minimum bend radius of 4t

Industrial Applications include bumper beams, door beams, rails in multiple vehicle platforms

ArcelorMittalAHSS Steels ≥1000 MPa for Roll Forming & bending
slide37

Metallurgical structure after hot-stamping

USIBOR 1500P

100% martensitic

Hardness : 400 to 500 HV1

Homogeneous mechanical properties in any point of the parts : Ys  1100 MPa, Ts  1500 MPa, E (ISO)  6%

arcelormittal ahss conclusion
ArcelorMittal has in market an extended and Worldwide Advanced High Strength Steels offer in order to

Provide the most effective solution for car structure weight reduction

where the OEM select and validate material to imagine new cars.

where the OEM builds cars.

ArcelorMittal keeps on developing new AHSS with further improvements

In lightweighting potential (higher Grades)

In manufacturing properties

ArcelorMittal AHSS: Conclusion