Advantages of Using coated steels in Automotive...
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Advantages of Using coated steels
in Automotive Industry
Avtar Singh Saini
Head, Product Application Group
Tata Steel
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Agenda
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1.0 Introduction
2.0 Corrosion Warranties
3.0 The big Debate GI Vs GA
4.0 Recommendations to stamp GA
5.0 Automotive coated outlook for India
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Agenda
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1.0 Introduction
2.0 Corrosion Warranties
3.0 The big Debate GI Vs GA
4.0 Recommendations to stamp GA
5.0 Automotive coated outlook for India
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We all Love our cars
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We all Love our cars
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Why Hot Dip Galvanising
Prevention of red rust
- aesthetic
- perforation
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World Corrosion Map
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In India more than 5% of GDP is lost every year to corrosion
Indian Corrosion Map
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Common places of Corrosion in Automobile
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Agenda
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1.0 Introduction
2.0 Corrosion Warranties
3.0 The big Debate GI Vs GA
4.0 Recommendations to stamp GA
5.0 Automotive coated outlook for India
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Auto Makers have warranties in place
Toyota
Honda
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Agenda
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1.0 Introduction
2.0 Corrosion Warranties
3.0 The big Debate GI Vs GA
4.0 Recommendations to stamp GA
5.0 Automotive coated outlook for India
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Region GA Usage GI Usage
North America
Europe
Japan 0
South Korea 0
India
GI Vs GA -‐ The Big Debate in Automotive
GI - Zero spangled Galvanised GA - Galvannealed
The Automotive world is divided GI vs. GA
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GI versus GA
Flat & shiny Al% bath ≥ 0.16
Rough & dull Al% bath < 0.14
FeΓ (21-28%)
Γ1+δ (15%)
ζ (6%)δ (7-12%)
GI = galvanised GA = galvannealed
T=~500°C
~20 s
Zn!Fe2Al5!
Fe!
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GI versus GA
Delta 7-11% Fe
Zeta 6% Fe
Steel Gamma 23% Fe
Microstructure GA (optical microscope, etched)
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GI versus GA
Advantages GA: • no stick during pressing
• paint adhesion
• weldable
Disadvantages GA:
• cratering for ED-paint
• powdering and flaking
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Powdering is the loss of small particles from the coating
under compressive forces.It is associated with high surface hardness, and promoted by high alloying
Flaking is the de-lamination of larger particles (but no necessary visible to naked eye) from the coating at the interface with the substrate. It is associated with insufficient surface hardness, and promoted by low alloying
Both defects may give dust pollution during press forming
Disadvantages of GA it its solutions
Process parameters to be controlled to minimize powdering & Flaking 1.Steel Chemistry 2. Line Speed 3. GA Electrical power 4. Coating Weight 5. % Al in bath 6. Heating rate •
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substrat
dzétadelta 1gamma
substrat
dzéta
delta 1gamma
substrat
delta 1gamma
Friction properties
Powdering properties - - ++
Underalloyed GA Overalloyed GA IFTiNb target GA 60 g/m2
The product target defined on IFTiNb
(60g/m2, 8-10% iron, a few zeta crystals on the surface, resulting
powdering < 5g/m2)
Powdering and flaking can be overcome
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ð Powdering recommendations at the customer plant
l Avoid the too low radii (typically less than 3 thicknesses) where the coating deformations are high, with risk of powdering and flaking, giving « pimples » on the stamped components
l Use a blank washing/re-oiling machine before stamping to :
1. Eliminate the dust from the previous process (storage, slitting, blanking…)
2. Apply a specific stamping oil (Check periodically the oil filtration)
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ð Powdering recommendations at the customer plant
l Use surface treatment (hard Cr, hard bronze, TiCN, Cr N ) or inserts for active surfaces (first step)
l Reinforced dies are required on all major parts because of the hard and abrasive GA coating
l Dies for critical parts shall be regularly restored because GA coating wears
l Have a special attention for draw-beads and blank holders surface
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ð Powdering recommendations at the customer plant
l Roughness of active surfaces must be in same order than sheet material (0.5 to 0.8 υm)
l Use surface treatment also for the cutting blames to avoid GA dust prone to « pimples »
!
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ð Powdering recommendations at the customer plant
Adapt quality control at the end of press line : - immediate stop if problem
Adapt frequency and method of cleaning during production : Typically two per hour
l Stamping tools cleaning
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ð Degreasing recommendations at the customer plant
l To remove oil (stamping, and some times rust protection) and all pollution accumulated between the press shop and the surface treatment
l The alkaline solution needs to be adapt to the oils to remove (to check with the degreasing supplier)
l Check periodically the degreasing efficient ness (water droplet wetting)
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ð Phosphatation recommendations at the customer plant
l Use a tri-cation (Zn, Mn, Ni) process with addition of free fluorine to complex the aluminium of the GA coating to deposit Hopeite : Zn3(PO4)2 + 4H2O
l Free fluorine: 0.22-0.25 g/l coating time: 3 min- coating weight: 2-3g/m2
Good Phosphatation criteria
Shape: needles
Size: <10µm
Coverage: 100%
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Cratering is a big hole in the E-coat. It results from the still going water de-sorption of the Hopeite when the E-coat solidifies. The GA high specific surface area makes the de-sorption time quiet long
Pinholes are some holes in the E-coat. They result from the H2 de-sorption inducing sparks when the E-coat solidifies. The GA high specific surface area produces high H2 volumes during the E coating
ð Cratering (and pinholes) during painting
1 cm Cratering + Pinholes
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ð E coating recommandations at the customer plant
l Voltage :
l Reduce it typically (200 / 260 V) with GA, versus more than 340 V for bare steel
l Adapt a complex multi step voltage process
l Baking : Adapt the process to release the gas before solidification
l E coat painting :
l Decrease the viscosity
l Increase the flow performance
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Agenda
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1.0 Introduction
2.0 Corrosion Warranties
3.0 The big Debate GI Vs GA
4.0 Recommendations to stamp GA
5.0 Automotive coated outlook for India
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TWO MAJOR RULES
POLLUTION DEGRADATION
AT ALL STAGES OF PRODUCTION
²1° Transport / Storage
² 2° Cutting / Palletization blanks
² 3° Loading press / Stamping blanks
² 4° Storage finish stamped parts
1 2
AVOID ANY SOURCE OF
Recommendations to stamp Galvannealed
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Galvannealed can be spot welded without productivity loss
Recommended conditions : - Transformers able to deliver a current intensity up to 13kA - Equipment able to progressively increase current intensity during
production ( Step up Transformers) - Automatic dressing of electrodes ( accuracy and Productivity Example of data : Nb of spots requested between 2 redressings @ 1000 Nb of redressings with 1 electrode 17-20 Nb of welding spots before electrode replacement 17000 to 20000
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Recommendations for surface treatment of Galvannealed BIW
Rinsing Activating Phosphatation Degreasing Rinsing
Alcaline degreasing : removal of all or part of Al oxides
- Tri cation phosphate (Zn, Ni, Mn) - F addition for aluminium complexation (fluosilicic acid) - Phosphatation bath in stainless steel 316L
BIW with Galvannealed parts
Reinforcement of anti corrosion protection. This step is not necessary if the phosphate layer is homogeneous and covering the surface. A rinsing step is necessary to avoid pollution of cataphoresis bath.
Passivation + rinsing
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Equivalent paint appearance can be achieved on GA as on EG
Surface quality requirements for exposed panels :
zero defect + paint appearance Limited waviness to optimise paint appearance
Waviness is controlled at the steel plant by set up parameters at rolling mill and in the galvanising line (temper rolling)
The waviness / paint appearance compromise is the
same for GA and EG
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Agenda
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1.0 Introduction
2.0 Corrosion Warranties
3.0 The big Debate GI Vs GA
4.0 Recommendations to stamp GA
5.0 Automotive coated outlook for India
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165 300
400 60
120
180
60
215
320
15
85
120
2014 2020
>= 590
340 - 440
270 (Exposed)
270 (Internal)
All figures in ‘000 MT
Key Trends
1. Significant growth expected in demand of hi-tensile (33%)
2. HT demand will follow the trend of CR
3. GI will gain ground as Ford is likely to shift to GI for its future models; VW will continue to use GI.
4. GI demand is expected to be ~13% of the total coated demand
.
300
720
Total
Hi-Tensile demand in coated products will follow the trend of CR
2024
1020
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END OF PRESENTATION
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