Blasting and painting hall in a structural steel plant – illustration

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.

Request a quotation Découvrir la solution

Sa 2½
Blast cleaning grade: C2 – CX
Corrosivity categories: L – VH
Durability ranges: DFT
Measured and recorded

Steel members after shot blasting, ready for coating – illustration

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

Shop primer

For dry, heated interiors and members that will be fire protected or finished by others.

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.

Applications

Why coat with World Steel

System matched to the site

Corrosivity category and durability agreed first – then the system, never the other way round.

Blasted, not brushed

Shot blasting to Sa 2½ gives the clean, rough profile a coating needs to adhere for its full life.

One plant, one quality system

Fabrication, blasting and coating under the same QC – no transport to a third party between steps.

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.

Records you can audit

Dry film thickness, adhesion where specified and inspection results filed with the quality dossier.

Packed to arrive intact

Coated members are packed and loaded to protect the finish – see export packing.

Normes et conformité

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

Toutes les normes United States →

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 Certifié WSCFabrication and erection – surface preparation and coating clauses

Toutes les normes Australia & New Zealand →

Europe

EN ISO 12944Paint systems, adopted as European standard
EN 1090-2 Certifié WSCExecution of steel structures – surface treatment requirements
EN ISO 1461Hot-dip galvanizing

Toutes les normes Europe →

Synthèse fournie à titre indicatif – le cahier des charges du projet, l'édition du code adoptée et l'autorité compétente prévalent.

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.

Prepared steel members in the plant – illustration

Project quality dossier including coating records – sample

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.

Atmospheric corrosivity categories
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

Durability ranges (ISO 12944-1)
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

Processus

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

Questions fréquentes

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.

Specify the right protection

Send us the site location, exposure and the life you expect – we reply with a coating system and its cost.

Request a quotation +84 902 881 833

Corrosion protection built in – blasted, coated and checked in our plant

Protection is designed, not just applied