PAM Northern Chapter Seminar����
BlueScope Steel Limited. ASX Code: BSL
ABN: 16 000 011 058
Date: 22nd August 2026
The information and advice contained in this presentation are of a general nature only and have not been prepared with your specific needs in mind. BlueScope makes no warranty as to the accuracy, completeness, or reliability of any estimates, opinions, or any information contained in this presentation, and BlueScope disclaims all liabilities and responsibility for any loss or damage, direct or indirect, which may be suffered by any person acting in reliance on anything contained in or omitted from this presentation.
By Nicole Ling
Consultation Manager
NS BlueScope Malaysia
From Specification to Inspection:
Ensuring Long-Term Performance of Coated Steel Roofing
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BLUESCOPE STEEL LIMITED (BSL)
We are a publicly listed company on the Australian Securities Exchange (ASX) since 15th July 2002 with more than 160 operations and sales offices across 15 countries with over 16,500 employees
2
Source: https://www.bluescope.com/our-steel/our-products
14 countries
Note: [1] NSC denotes Nippon Steel Corporation
50%
BlueScope
50%
NSC[1]
NS BlueScope Coated Products (NSBCP)
160+ sites
16,500+ employees
Vietnam
Thailand
Malaysia
Indonesia
NS BLUESCOPE MALAYSIA
Established in Malaysia in 1991, we have built a 35-year legacy as the leading producer and supplier of premium metallic-coated and pre-painted steel, including COLORBOND® steel, ZINCALUME® steel, and TRUECORE® steel, for the Malaysian market. We are proud to be the only local manufacturer capable of producing Aluminium-Zinc coating technology
3
Metallic Coating Capacity: 185,000 metric tonnes per annum
Coil Painting Capacity: 118,0001 metric tonnes per annum
1Inclusive of the In-Line Painting (ILP) facility of 43,000 metric tonnes per annum.
1991
Established in Malaysia
1996
Started Coated Painting Line (CPL) operation
1997
Started Metallic Coated Line (MCL) operation
2013
Joint-Venture
35 Years of Excellence in Malaysia
30 Years of Proven Performance
CONTENT
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Material selection
Specification
Technical Approval
Site Inspection
Warranty & Performance
Introduction of metallic coatings
1
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Steel
WATER
AIR
Rusted Steel
Brittle and crumbly
Strengthless
Unattractive
Metallic Coating Technology
Metallic Coating Technology
CORROSION
Corrosion is the oxidation of steel, and it is commonly called rust.
WHAT IS METALLIC COATINGS ?
Source [1]: https://www.facebook.com/photo.php?fbid=605313916162045&id=229713580388749&set=a.605312292828874
Source [2]: https://huntergal.com.au/galvanizing/what-is-galvanizing/
[1]
Metallic Coating /
Hot-Dip Galvanising
Base Steel
Metallic Coating
Metallic Coating
Sacrificial Protection
Sacrifice
9
WHAT IS PRE-PAINTED COATED STEEL?
Steel
Metallic Coating Technology Aluminium-Zinc (AZ)
Metallic Coating Technology Aluminium-Zinc (AZ)
Finish Painting Coat
(with primer)
Back Painting Coat
(with primer)
Oven Cured
10
THE PRODUCTION STANDARD
Finish Coat
Primer
Alloy layer
Alloy layer
Backing Coat
Primer
Base Steel
Prepainted steel with various paint system and finishing (solid / metallic / textured / matt) |
Standard: AS/NZS 2728 or MS 2383 |
Base Metal Thickness (BMT): 0.20 – 1.00mm |
Metallic coated steel (55% Aluminium-Zinc alloy coating) |
Standard: AS 1397 or MS 1196 |
Base Metal Thickness (BMT): 0.20 – 1.20mm |
Standards & Compliance
2
11
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THE MALAYSIA LEGACY
1983 Mitsubishi Lancer Fiore
Launched on 9 July 1985
Proton Saga
Perodua Bezza
Proton Persona
Proton Saga
AREN’T ALL THE METALLIC COATED STEEL COIL THE SAME?
Z Coated Steel
AZ Coated Steel
Same same, no?
AREN’T ALL ALUMINIUM-ZINC COATED STEEL THE SAME?
AZ150
AZ150
AZ150
Introduction of Australian Standard (AS)Related to Coated Steel
15
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AS1397 AND AS2728 TO HELP YOU IDENTIFY THE TYPE OF COATED STEEL AND THE BEST PRODUCT
AS1397
AS2728
THE PRODUCTION AND QUALITY CONTROL STANDARD
AS 1397
AZ150
AS/NZS 2728
AZ150
AS 1397
AS/NZS 2728
AZ150
GB/T or JIS?
AZ150
ASTM
AZ150
ASTM/GB/T/JIS
AZ150
The performance of coated steel may vary when different manufacturing processes and quality‑control standards are used, even if the products carry the same designation
Metallic Coating Process
Prepainted Process
Quality Control Process
So, what can I learn from AS1397?
AS1397
TYPE OF METALLIC COATING TECHNOLOGY
The following sharing is based on the requirement of AS1397, clause 1.3.3 Coating Type.
Zinc Coating (Z)
99% Zinc
Aluminium-Zinc Coating (AZ)
50-60% Aluminium
+
1-2% Silicon
+
Remainder Zinc
Zinc-Aluminium Coating (ZA)
3-15% Aluminium
+
Remainder Zinc
Zinc-Aluminium-Magnesium Coating (ZM)
5-13% Aluminium
+
2-4% Magnesium
+
Remainder Zinc
Aluminium-Zinc-Magnesium Coating (AM)
47-57% Aluminium
+
1-3% Magnesium
+
1-2% Silicon
+
Remainder Zinc
Zinc-Rich Coating
Aluminium-Rich Coating
WHICH ARE THE MOST COMMON METALLIC COATING USED IN STEEL ROOF, WALL, CEILING AND FACADE?
Zinc Coating (Z)
99% Zinc
Aluminium-Zinc Coating (AZ)
50-60% Aluminium
+
1-2% Silicon
+
Remainder Zinc
Z180
Z275
Z350
AZ100
AZ150
AZ200
DESIGNATION OF COATING CLASS
The following sharing is based on the requirement of AS1397, clause 1.5.3 designation of coating class and surface finish
AZ
150
Coating Technology:
Aluminium-Zinc
Coating Mass:
150 g/m2
A
B
A + B = 300g/m2
Base Steel
A
B
A + B = 150g/m2
Base Steel
OR
Z technology require thick coating
Base Steel
Z
275
Base Steel
AZ
150
AZ technology only need thin coating
EXAMPLE:
How to define AZ150?
COATING MASS
Base Steel
Z
275
Base Steel
AZ
150
The following sharing is based on the AS1397, Appendix D, D1.2
Not equivalent !!
COATING MASS
The following sharing is based on the AS1397, Appendix D, D1.2
AZ100
AZ150
AZ200
Zinc Coating (Z)
Aluminium-Zinc Coating (AZ)
Z180
Z275
Z350
I got it! It means Z275 = AZ150, right?
It is WRONG!
COATING TECHNOLOGY
Zinc
Base Steel
Cross Sectional Microstructure View of Z Coating
Coating Technology: thicker and heavier coating
Protection Capability: SINGLE
Performance in Benign Env.: normal
Material Composition:
99.8% Zinc
Coating Technology: thinner and lighter coating
Protection Capability: DOUBLE
Performance in Benign Env.: *FOUR Times better
*note: it is only applicable for case of coated steel with AZ150 compared to Z275 at benign environment only.
Material Composition:
55% Aluminium, 43.5% Zinc and 1.5% Silicon
Base Steel
Cross Sectional Microstructure View of ZINCALUME® steel Coating
Zinc Coating (Z)
Aluminium-Zinc Coating (AZ)
So, what can I learn from AS2728?
AS2728
How can I ensure that the coated steel roof and wall products have superior corrosion resistance?
CORROSION RESISTANCE ASSESSMENT
Manufacturers do not wait 10 years or longer to assess the corrosion resistance of coated steel before commercialisation, as such an approach is neither practical nor commercially viable.
Source[2]: chrome-extension://efaidnbmnnnibpcajpcglclefindmkaj/https://www.q-lab.com/documents/public/aaeb23ca-bb8a-4012-a763-2038a5927ff6.pdf
Salt Spray Test (SST)
[1]
Salt Spray
[2]
Salt Spray
[2]
Air Drying
[2]
Condensation Humidity
Cyclic Corrosion Test (CCT)
ACCELERATED CORROSION TEST: SST vs CCT
The following sharing is based on the AS2728, Appendix I Accelerated Corrosion Test
SST
Complaint
CCT
ACCELARATION TEST: SST vs CCT
Salt Spray Testing (SST) was originally used in the automotive industry to assess coated steel for vehicle manufacturing. Over time, research has shown that Cyclic Corrosion Testing (CCT) provides a more reliable assessment of corrosion resistance under real‑world conditions.
1930s
1990s
SALT SPRAY TEST (SST) VS CYCLIC CORROSION TEST (CCT)
Source: Akzo Nobel, Paint Seminar 2014. Disclaimer: The above result is only applied to this particular product and not all the products available in the market.
Prepainted 55%Al-Zn, PPGL
SST: 2000 hours
CCT: 2000 hours
SST: 2000 hours
CCT: 2000 hours
Prepainted Galvanized Zn, PPGI
Material passed SST might not be able to pass CCT!
CYCLIC CORROSION TEST (CCT) IS A MUST!
I know your product’s corrosivity category is C4. Tell me have you passed 2000hours CCT?
1000 hours Cyclic Corrosion Test (CCT)
Proven with
Conforming minimally ISO9223 C3 Environment
JKR Master Spec 2025
GOOD QUALITY VS ALTERNATIVE PRODUCT (10 YEARS)
Source: BlueScope 2010 Case Study at Benign Environment
Good Quality Product
Alternative Product
GOOD QUALITY VS ALTERNATIVE PRODUCTS (12 YEARS)
Source: BlueScope 2022 Case Study (CS-CCB-19_Battalion 12 Miri)
Good Quality Product
Good Quality Product
Alternative Product
Malaysian Standard (MS) About Coated Steel
35
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MS1196 AND MS2383 TO HELP YOU IDENTIFY THE TYPE OF COATED STEEL AND THE BEST PRODUCT
MS1196
MS2383
AUSTRALIAN STANDARD AND MALAYSIAN STANDARD
AS1397
MS1196
AS2728
MS2383
WHY ARE THERE TWO DIFFERENT STANDARDS FOR COATED STEEL REQUIREMENTS?
What is the reason for having TWO separate standards?
MANUFACTURING REQUIREMENTS AND LAW ENFORCEMENT
AS1397
AS2728
Govern the Manufacturing and Quality Control
Law Enforcement
subseksyen 33C(2) Akta Lembaga Pembangunan Industri Pembinaan Malaysia 1994 [Akta 520]
MS1196
MS2383
CIDB ENFORCEMENT UNDER ACT 520
What is the consequence of using construction materials without PPS?
AMENDMENT OF FOURTH SCHEDULE
AS1397
MS1196
AND / OR
MS2383
AZ
AZ
AS1397
MS1196
How to specify �coated steel roofing correctly ?
3
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EXAMPLE OF SPECIFICATION FOR COATED STEEL ROOFING & WALL CLADDING
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“ Supply & install 0.48mm metal roofing sheet, approved by architect.”
Not enough !!
A MORE COMPLETE SPECIFICATION SHOULD ADDRESS……
2. Material
3. Performance & compliance
1. Product
4. Installation
EXAMPLE OF BILL OF QUANTITY WRITING �(DESCRIPTION OF AZ150 PRE-PAINTED COATED STEEL ONLY)
Note:
The sample of Bill of Quantities writing including the information and recommendations contained therein is of a general nature only and has not been prepared with your specific needs in mind. BlueScope makes no warranty as to the accuracy, completeness or reliability of any estimates, opinions or other information contained in these sample of Bill of Quantities writing, and to the maximum extent permitted by law, BlueScope disclaims all liabilities and/or responsibility for any loss or damage, direct or indirect, which may be suffered by any person acting in reliance on anything contained in or omitted from these sample of Bill of Quantities writing. These sample of Bill of Quantities writing may contain information that is confidential and/or subject to legal privilege intended only for use by the intended recipient and no other party shall be permitted to rely on the contents thereto. If you are not the intended recipient and have received this sample of Bill of Quantities writing, you will not be permitted to make use of these sample of Bill of Quantities writing without the prior written consent of BlueScope.
Item | Description | Qty. | Unit |
A | Roof (or Wall / Ceiling) Covering Supply and install <size>mm BMT <roofing / walling / ceiling> sheet in COLORBOND® <Brand Name> AZ150 steel conforming to MS1196 and AS1397 in accordance with the manufacturer‘s instruction and Architect’s approval. The coated steel shall be tested according to AS/NZS 2728 Type 4 or MS 2383 – C4 (2000 hours Cyclic Corrosion Test. The exterior finish shall have a total nominal dry film thickness (DFT) of 25μm on the top side or weather side. The backing coat shall be Shadow Grey with a total nominal 10μm DFT. Fasteners used shall comply with minimum AS 3566 Class 3 (> 400m marine) and be certified as such by the supplier of fasteners and to the approval of the S.O. All <roofing / walling / ceiling> sheet shall be printed with branding text which indicate product name, coating mass and production date and time for identification. | | m2 |
B | Flashing & Capping Supply and install <size>mm BMT flashing and capping in COLORBOND® <Brand Name> AZ150 steel including all necessary fixing accessories all in accordance with the manufacturer's instruction and Architect's approval. Fasteners used shall comply with minimum AS 3566 Class 3 ( > 400m marine) and be certified as such by the supplier of fasteners and to the approval of the S.O.
| | m m m |
Technical approval & site inspection
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TECHNICAL APPROVAL
What is the metallic coating on the substrate ?
.Tell me have you passed Cyclic Corrosion Test (CCT)?
What is the composition of the metallic coating ?
Any product certification or green certification ?
What is the coating class?
I know your product cover by XX years warranty. Tell me your colour durability after warranty period?
Are they comply to
AS1 397/MS 1196; AS/NZS 2728/MS 2383 ?
Are they comply to Act 520 with CIDB PPS certification ?
What is the base metal thickness (BMT) ?
Not to be reproduced or disseminated without permission
SITE INSPECTION AND VERIFICATION NEEDS
INSPECTION ON COATED STEEL ROOF
Source[1]: https://roofdesign.com/what-to-expect-from-roof-visual-inspections//
Past
Now
[1]
This is steel roof
Oh
Oh
[1]
How can we identify the origin of the material?
We can track the document
THE PRODUCT BRANDING TEXT
Product marking (branding text) to ease identification and traceability
Each coated steel is branded with distinctive branding text (brand name, production date and time) at the reverse side of the strips to ease identification and traceability.
A SMARTER SOLUTION FOR PRODUCT AUTHENTICITY VERIFICATION
Benefits of additional branding text:
COLORBOND(R) made by BlueScope 02:18 09: JAN: 26
The branding text appears on surface when exposed to ultraviolet (UV) light and is invisible under normal lighting conditions.
Branding Text
The Proof of Authenticity
Enable easy authentication
Fake Product
Safeguard the fake product
Protecting customers from counterfeit materials
THE NEW BRANDING IDENTIFICATION SOLUTION: �BRANDING TEXT IS ADDED TO THE SURFACE
Branding text (brand name, production date, and time) is printed on the strips with Ultraviolet (UV) ink to enable easy identification and traceability.
Warranty & Performance
5
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COMMON WARRANTY GIVING BY PREPAINTED COATED STEEL ROOF MANUFACTURER / SUPPLIER
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54
Shall not Perforated by Corrosion
[1]
Source [2]: http://www.idcoatingservices.com/our_services_planned_maintenance_scheduling.asp
Source [3]: https://longhomeproducts.com/blog/do-metal-roofs-affect-wi-fi/
Source [4]: https://gamebestmk.best/product_details/46204677.html
Shall not Colour Fade Excessively
[3]
Shall not Peel or Flake Excessively
[2]
Shall not Discolour by Dirt Stain
[4]
Not to be reproduced or disseminated without permission
FACTORS THAT MAKE MATERIAL PERFORMANCE TALLY WITH WARRANTY
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55
Design
[1]
Workmanship
[2]
Not to be reproduced or disseminated without permission
Design
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CHOOSE THE RIGHT METALLIC COATING CLASS ACCORDING TO THE ENVIRONMENT
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Source [1]: https://www.yourdictionary.com/articles/rural-urban-suburban-difference
Source[2]: https://www.irgcayman.com/properties-for-sale-in-the-cayman-islands/george-town
Source[3]: https://integratedglobal.com/case_studies/corrosion-mitigation-through-hvts-cladding-in-singapore/
Suitable for Benign Environment or Mild Urban / Rural
*at least 1km away from marine or corrosive industrial point
[1]
Suitable for Severe Marine / Industrial Environment
*Extreme severe marine environment subject to case-to-case study basis
[2]
[3]
AZ150
AZ200
Metallic Coating Class
Extracted from AS1397:2011, Page 16
Note: warranty might be downgraded or voided if unsuitable metallic coating class is used in corrosive environment
Not to be reproduced or disseminated without permission
CHOOSE THE RIGHT FASTENER
The following information is extracted from AS3566:2:2002, Page 6
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Source [1]: https://www.workshop.bunnings.com.au/t5/Outdoor/How-to-stop-roof-screws-rusting/td-p/199763
Source[2]: https://ccheapus.bedandbreakfaststamford.org/category?name=metal%20roof%20screws%20rusting
[1]
[2]
Note: warranty might be voided if unsuitable corrosion resistance class of screwis used for corrosive environment
At least Class 3 screw in benign environment, but Class 4 must be used in corrosive environment
Not to be reproduced or disseminated without permission
CHOOSE THE COMPATIBLE MATERIAL
The following information is extracted from AS1562:1:2018, Page 28
59
59
Extracted from AS1562:1:2018, Table C3
[1]
Note: warranty might be voided if incompatible material is touch with prepainted coated steel
[2]
Not to be reproduced or disseminated without permission
Workmanship & �Inspection
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SITE STORAGE
The following information is extracted from SA HB39:2015; Page 28
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Source [1]: https://cedarrapids.craigslist.org/mat/d/walford-metal-roof-sqft/7752571822.html
Source[2]: https://roofingmagazine.com/the-top-5-issues-in-metal-roof-installation/
Source[3]: https://sheffieldmetals.com/learning-center/how-to-handle-store-panels/
[1]
[2]
[3]
Note: perforation by corrosion caused by improper storage on site will not be covered under warranty
Not to be reproduced or disseminated without permission
TRIMMING ON SITE
The following information is extracted from SA HB39:2015; Page 29 & 30
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62
Note: perforation by corrosion caused by improper tools used on site to trim the prepainted coated steel sheets will not be covered under warranty
[1]
Burred Edge
Not to be reproduced or disseminated without permission
HOUSEKEEPING ON SITE
The following information is extracted from SA HB39:2015; Page 30
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Note: swarf stain will not be covered under warranty
Swarf must be cleaned immediately or by the end of each working day.
[1]
Not to be reproduced or disseminated without permission
Quality is a choice.
Choose to make it better.
-Ron Kaufman
Not to be reproduced or disseminated without permission
Q & A
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Nicole Ling (+6012-653 2240)
E-mail: nicole.ling@bluescope.com
Website: www.nsbluescope.com/my/
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