Zincalume Steel 55% AL ZN Vs Galvanised Steel

 

ZINCALUME® steel v/s Galv Ga lvan anis ised ed st stee eell

 

What is Galvanized steel? • Galv Galvaniz anized ed steel is zi zinc nc coat coated ed (99.8% (99.8%)) • Has bee been n around in in its current current form since 1936 1936 • The Zinc coating is completely completely sacrificial, sacrificial, • It gives iitself tself up to the environment environment to protect the steel • Z275 = a min minimum imum o off 275 g gram ram pe perr m2 of zinc zinc - total of b both oth s sides ides • Z275  20 micrometre thick zinc coating on each side ≈

󰁭󰁯󰁵󰁮󰁴󰁩󰁮󰁧 󰁭󰁥󰁤󰁩󰁵󰁭 󰁚󰁮 󰁣󰁯󰁡󰁴󰁩󰁮󰁧 󰁡󰁬󰁬󰁯󰁹 󰁬󰁡󰁹󰁥󰁲 󰁳󰁴󰁥󰁥󰁬

 

What is ZINCALUME® Steel? •

Only m ma ade b by y Tata B BllueScope S Stteel

•

ZINCALUME ®  steel is coated with a zinc/aluminium alloy ( 55% Al, Zn)

• •

De Deve velo lope ped d in the the 60 60’’s, Bl Blue ueSc Scop ope e St Stee eell star starte ted d ma maki king ng it in 19 1972 72 Com Combi bines nes the sac sacrif rific icial ial ben benefi efits ts o off zi zinc nc with tthe he lon long g lilife fe barrie barrierr pr prote otecti ction on of aluminium ( up to 4 times life than galvanised steel with Z275)

•

AZ150 = a minimum of 150 gram per m2 of zinc/aluminium zinc/aluminium alloy alloy coating – both sides

•

AZ150  25 micrometre thick of zinc/aluminium alloy coating on each side ≈

20

µm

Zinc Rich Area Aluminium Rich Area Silicon Particles Inter-Metallic Layer 

 

Cross section

Microstructure

 

Salt Spray Testing simulates severe marine exposure    t 3500   s   u   r    d   e   r    t   n   a   c    i    f    i   n   g    i   s

3000

Protected Edges Unprotected Edges

2500 2000 1500

   t   s   r    i    f 1000   o    t   s 500 0   r 50   u   o 0    H

GI

ZAL

AL1

󰁇󰁉󰀭󰁇󰁡󰁬󰁶󰁡󰁮󰁩󰁳󰁥󰁤, 󰁚󰁁󰁌󰀭 󰁚󰁉󰁎󰁃󰁁󰁌󰁕󰁍󰁅, 󰁁󰁌󰀱󰀭 󰁁󰁬󰁵󰁭󰁩󰁮󰁩󰁳󰁥󰁤 󰁳󰁴󰁥󰁥󰁬 󰁁󰁬󰁵󰁭󰁩󰁮󰁩󰁳󰁥󰁤 󰁳󰁴󰁥󰁥󰁬 󰀱, 󰁁󰁌󰀲󰀭 󰁁󰁬󰁵󰁭󰁩󰁮󰁩󰁳󰁥󰁤 󰁳󰁴󰁥󰁥󰁬 󰀲. * 󰁣󰁯󰁡󰁴󰁩󰁮󰁧 󰁣󰁬󰁡󰁳󰁳 󰁮󰁯󰁲󰁭󰁡󰁬󰁩󰁳󰁥󰁤 󰁦󰁯󰁲 0.󰀲0 󰁭󰁭 󰁣󰁯󰁡󰁴󰁩󰁮󰁧 󰁴󰁨󰁩󰁣󰁫󰁮󰁥󰁳󰁳.

AL2

 

ZINCA ZINCALUME® LUME® stee steell - Exce Excellent llent Corro Corrosion sion resistance in Simulated Condition (Salt Spray Test) 󰁓󰁡󰁬󰁴 󰁓󰁰󰁲󰁡󰁹 󰁔󰁥󰁳󰁴 (󰁌󰁡󰁢 󰁔󰁥󰁳󰁴) 󰀺 󰁁󰁓󰁔󰁍 󰁂󰀱󰀱󰀷

Galvanized Z275

ZINCALUM ZINC ALUME® E® AZ15 AZ150 0

ZINCALUM ZINC ALUME® E® AZ15 AZ150 0

after 240 hrs

after 240 hrs

after 2000 hrs

6

 

Tested and Proven Product : Routine Tests carried for every coil / lot for ZINCALUME® steel 

Adhesion test T Bend Test  – it measure the flexibility and adhesion of paint with the substrate.

T Bend Test



Impact Test : it measure the flexibility and adhesion of paint with the substrate when product under impact force i.e.10 J

7

 

Galvanised steel : Inte Intergr rgranu anular lar Cor Corros rosion ion & Cracking

Galvanised steel

•

Int Interer-gra granul nular ar cor corros rosion ion occ occurs urs in ZnZn-Al Al-Pb -Pb ga galva lvanis nised ed ste steel el coa coatin ting gw whe hen n ag aged ed at ambient temperature in humid environment.

•

Int Interer-gra granul nular ar cr crack ackin ing g res resul ults ts w when hen s such uch pro produc ductt is s sub ubseq seque uentl ntly y def deform ormed. ed. 8

 

Real life tests : To check the perform performance ance in UV & Corrosive environments Real Life performance testing testing : Corrosion & Paint Performance Performance Monitor real life performance on buildings

Wide range of long term exposure sites around the world (> 30 years) Testing of ~ 18,000 samples per year

Exposure site near coast

9

 

Sacrificial Protection : Zincalume is better than galvanised steel in lower thickness    󰁭    󰁭    󰀵    󰀲  .    0

   󰁭    󰁭    󰀵  .    0

   󰁭    󰁭    󰀵    󰀷  .    0

   󰁭    󰁭    󰀱

   󰁭    󰁭    󰀲

󰁇󰁡󰁬󰁶󰁡󰁮󰁩󰁳󰁥󰁤 󰁳󰁴󰁥󰁥󰁬 󰁉

9 months Industrial Marine (Port Kembla)

󰁚󰁩󰁮󰁣󰁡󰁬󰁵󰁭󰁥

󰁁󰁬󰁵󰁭󰁩󰁮󰁩󰁳󰁥󰁤 󰁳󰁴󰁥󰁥󰁬 󰁁󰁌󰀱

󰁇󰁉󰀭󰁚󰁁󰁌󰀭󰁁󰁌󰀱

 

ZINCALUME® steel V/s Galvanised steel : Severe Seve re Marine Marine environme environment nt – 21 years years Exposure Exposure

ZINCALUME® steel AZ150

Galvanised steel Z275 Site: Bellambi Point (sea shore), Australia Australia

11

 

Painted ZINCALUME® steel V/s Painted Galvanised steel : Severe Marine environment Location Bellambi Point , Australia : 50 m from Sea, 100 m from sewage sewage water treatment plant (high Sulphur fumes)

Corrosion resistance is from type of Metallic coating and its mass. Paint is providing an aesthetic to your building with some some additional life

12

 

ZINCALUME® steel V/s Galvanised steel Comparative Coating Life

13

 

Performance of Zincalume against Galvanized Steel at various sits

Site

Coating loss Galvanized Steel – Z 275 ZINCALUME® steel – AZ 150 g/m2/Y

µm/Y

g/m2/Y

µm/Y

Severe Marine

140

9.8

16

2.2

Marine

18

1.3

4.0

0.54

Industrial / Marine 20

1.4

4.2

0.57

Rural

0.28

1.3

0.17

4

ZINCALUME® steel last up to 4 times longer than galvanized steel in similar atmospheric condition

 

In summary ZINCALUME® steel (AZ150) has advantage over galvanised steel (Z275) •

Lo Long ng llif ife e : Cor Corro rosi sion on per perfo form rman ance ce c com ombi bine nes s th the e be bene nefi fits ts o off Al Alum umin iniu ium m

•

and sacrificial Zinc Higher Yield : More length per tonne

•

Excellent Paintability

• •

Ex Exce cellllen entt He Heat at Re Resi sist stan ance ce & He Heat at Re Refflect lectiv iviity Attractive matte finish

•

Excellent P Pe erform rma ance iin n ''u unwas ash hed' are rea as

•

Excellent fo formability

󰁎󰁯󰁴󰁥󰀺 󰁁󰁚0󰀷0 󰁷󰁨󰁥󰁮 󰁣󰁯󰁭󰁰󰁡󰁲󰁥󰁤 󰁴󰁯 󰁚󰀱󰀲0 󰁷󰁩󰁴󰁨 󰁳󰁩󰁭󰁩󰁬󰁡󰁲 󰁣󰁯󰁡󰁴󰁩󰁮󰁧 󰁴󰁨󰁩󰁣󰁫󰁮󰁥󰁳󰁳, 󰁰󰁥󰁲󰁦󰁯󰁲󰁭󰁳 󰁭󰁵󰁣󰁨 󰁢󰁥󰁴󰁴󰁥󰁲

 

Thank you