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C1 · C2 interior
Shop primer
For dry, heated interiors and members that will be fire protected or finished by others.
Service · Blasting, coating & galvanizing
Corrosion protection built in – blasted, coated and checked in our plant
The coating decides how long your steel lasts before its first major maintenance. We classify the site, select the system for the durability you need, shot blast every member and apply and inspect the coating under the same quality system as the fabrication – with hot-dip galvanizing and duplex systems on request.
- Sa 2½
- Blast cleaning grade ISO 8501-1 · SSPC-SP 10
- C2 – CX
- Corrosivity categories ISO 12944-2 / ISO 9223
- L – VH
- Durability ranges up to more than 25 years
- DFT
- Measured and recorded coating report in the dossier
Protection is designed, not just applied
A paint system that is right for an inland warehouse fails early on a seafront; a system made for offshore exposure is money wasted indoors. We start from the site – its corrosivity category and the time you expect before the first major maintenance – and select a system that meets both.
Then the steel is prepared for it: welds dressed, sharp edges rounded, every surface shot blasted to the specified grade, coated in controlled conditions and checked. Thickness, adhesion and appearance are recorded and filed in the project quality dossier.
Protection systems
Choose the system for your exposure
Typical options – the final system, thicknesses and colours follow the project specification.
C1 · C2 interior
C2 – C4
Epoxy paint system
Zinc-rich or epoxy primer with epoxy intermediate coats – the standard choice for industrial and commercial buildings.
C3 – C5 · UV
Epoxy + polyurethane
Polyurethane topcoat for colour and gloss retention on exposed steel and architectural members.
on request
Hot-dip galvanizing
Zinc coating to ISO 1461, ASTM A123 or AS/NZS 4680 – members detailed with vent and drain holes from the start.
C5 · CX coastal
Duplex system
Galvanizing with a paint system on top for seafront, island and aggressive industrial sites – see coastal & island steel.
RAL · project colours
Colour selection
Topcoat colours chosen with you – try them on a 3D model in our colour selector.
التطبيقات
Why coat with World Steel
01
System matched to the site
Corrosivity category and durability agreed first – then the system, never the other way round.
02
Blasted, not brushed
Shot blasting to Sa 2½ gives the clean, rough profile a coating needs to adhere for its full life.
03
One plant, one quality system
Fabrication, blasting and coating under the same QC – no transport to a third party between steps.
04
Details that do not trap water
Drainage, sealing and edge details are part of our design, so the coating is not defeated by the shape.
05
Records you can audit
Dry film thickness, adhesion where specified and inspection results filed with the quality dossier.
06
Packed to arrive intact
Coated members are packed and loaded to protect the finish – see export packing.
المعايير والامتثال
Coating standards we work to
We follow the coating standard named in your specification – these are the most common.
International
- ISO 9223 · ISO 12944-2Corrosivity of atmospheres – categories C1 to CX
- ISO 12944-1 · -5Durability ranges L to VH; protective paint systems
- ISO 8501-1 · ISO 8501-3Visual cleanliness grades (Sa 2½); preparation grades P1 – P3 for welds and edges
- ISO 8503 · ISO 8502-3Surface roughness profile; dust on blast-cleaned surfaces
- ISO 19840 · ISO 4624Dry film thickness on rough surfaces; pull-off adhesion
- ISO 1461Hot-dip galvanized coatings on fabricated iron and steel articles
United States
- SSPC-SP 6 · SP 10Commercial and near-white blast cleaning
- SSPC-PA 2Measurement of dry coating thickness
- ASTM A123 · ASTM D4541Hot-dip galvanizing; pull-off adhesion
Australia & New Zealand
- AS/NZS 2312.1Protection of structural steel – paint coatings
- AS/NZS 2312.2 · AS/NZS 4680Hot-dip galvanizing – design and coating
- AS/NZS 5131 معتمد لدى WSCFabrication and erection – surface preparation and coating clauses
Europe
- EN ISO 12944Paint systems, adopted as European standard
- EN 1090-2 معتمد لدى WSCExecution of steel structures – surface treatment requirements
- EN ISO 1461Hot-dip galvanizing
ملخص للاسترشاد فقط – تسري مواصفات المشروع وإصدار المعيار المعتمد والجهة المختصة.
Surface preparation
Most coating failures start before the first coat
Paint adheres to what is under it. Before blasting, welds are dressed, spatter removed and sharp edges rounded to the preparation grade specified. Blast cleaning then removes mill scale and rust to Sa 2½ and gives the surface profile the system needs. Cleanliness, dust and roughness are checked, and the first coat goes on before the surface can flash-rust.
Inspection
Measured, recorded, released
Ambient conditions are checked before coating and dry film thickness is measured and recorded before the steel is released. Adhesion tests and holiday tests are made where the specification asks for them. The results go into the coating section of the quality dossier handed over with your project.
Reference
Corrosivity categories and durability
Indicative guidance from ISO 12944-2 and ISO 12944-1 for early planning – the category is confirmed for each site.
| Category | Corrosivity | Typical exterior | Typical interior |
|---|---|---|---|
| C1 | Very low | – | Heated buildings with clean atmospheres – offices, shops, schools |
| C2 | Low | Atmospheres with low pollution, mostly rural areas | Unheated buildings where condensation may occur – depots, sports halls |
| C3 | Medium | Urban and industrial atmospheres, moderate pollution; coastal areas with low salinity | Production rooms with high humidity and some pollution – food plants, laundries |
| C4 | High | Industrial areas and coastal areas with moderate salinity | Chemical plants, swimming pools, coastal boatyards |
| C5 | Very high | Industrial areas with high humidity and aggressive atmosphere; coastal areas with high salinity | Buildings with almost permanent condensation and high pollution |
| CX | Extreme | Offshore areas with high salinity; industrial areas with extreme humidity; subtropical and tropical atmospheres | Industrial areas with extreme humidity and aggressive atmosphere |
| Range | Time to first major maintenance |
|---|---|
| L – low | Up to 7 years |
| M – medium | 7 to 15 years |
| H – high | 15 to 25 years |
| VH – very high | More than 25 years |
العملية
How we protect your steel
- 1
Specify
Site category, durability, system and colours agreed in the design basis.
- 2
Prepare
Welds dressed, spatter removed, edges rounded to the preparation grade.
- 3
Blast
Shot blasting to Sa 2½; cleanliness, dust and roughness checked.
- 4
Coat
Primer, intermediate and topcoats applied in controlled conditions.
- 5
Inspect
Dry film thickness measured; adhesion and appearance checked where specified.
- 6
Record & pack
Results filed in the quality dossier; members packed to protect the finish.
FAQ
الأسئلة المتكررة
Which paint system do you recommend?
It depends on the site corrosivity category and the durability you need. Tell us the location and the use of the building – we propose a system to ISO 12944 or to your specification, with its thicknesses and colours.
Do you galvanize?
Hot-dip galvanizing and duplex systems are available on request. Members to be galvanized are designed and detailed for it from the start, with vent and drain holes and suitable connections.
Can we use the paint brand named in our specification?
Yes – where the specification names a product or an approved list, we apply that system and follow the manufacturer's data sheets.
How is coating damage from transport and erection repaired?
Members are packed to protect the finish, and touch-up material matching the system is supplied with the steel so minor damage is repaired at site according to the specification.
Will we receive coating records?
Yes. Dry film thickness readings, and adhesion or other tests where specified, are filed in the coating section of the project quality dossier.
محتوى ذو صلة
مواد البناءIntumescent coatings
المنتجاتPrimary framing
Specify the right protection
Send us the site location, exposure and the life you expect – we reply with a coating system and its cost.