Norsk Overflate Teknikk AS - Varmforzinking

Hot-dip galvanizing

Hot-dip galvanizing is the best and most economical way to protect iron and steel against rust, and it ensures a long, maintenance-free service life.

Steel is a nobler metal than zinc, so the zinc provides cathodic protection of the steel. During the hot-dip galvanizing process, zinc and iron react to form an alloy. This acts as an extremely strong adhesion between the metals.

Hot-dip galvanized steel requires no maintenance, and has a service life of 50–100 years, depending on climate conditions. Wet coating, or powder coating, will extend the service life even further.

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Technical specifications
NOT Varmforzinking has one of the largest hot-dip galvanizing facilities in Norway, with a capacity of 7,500 tonnes per year.

Steel crucible:
T=460°C, l 13 m x w 1.5 m x h 2.2 m

Zinc content in the crucible: 320 tonnes

NOT

Max. dimensions of structures:
l 12 m x w 1.49 m x h 4 m.

Pre-treatment
Black steel:
The surface of the steel is cleaned through the following pre-treatment process: cleaning in degreasing bath and HCl pickling bath. Next in line is a rinsing bath, followed by a bath containing Florflux, a binding agent to ensure that the zinc bonds with the steel. The steel is then allowed to dry. Finally, the pre-treated steel is dipped in a bath of zinc.

Painted/primed steel:
Painted/primed steel must be sandblasted prior to pre-treatment. The surface of the steel is cleaned through the following pre-treatment process: cleaning in HCl pickling bath. Next in line is a rinsing bath, followed by a bath containing Florflux, a binding agent to ensure that the zinc bonds with the steel. The steel is then allowed to dry. Finally, the pre-treated steel is dipped in a bath of zinc.

Find out more about:
Technical details of hot-dip galvanising
http://nordicgalvanizers.com/Infoblade.htm
Choice of steel for hot-dip galvanising

Max. dimensions, joists and pipes: l 16 m.

4 gantry cranes with a lifting capacity of 6.4 tonnes per crane. The greatest lifting capacity for structures is 12.8 tonnes.

Contact

Svein Arne Njærheim
Operations Manager/Planner
Tel +47 982 96 251
san@not-as.no

Tor Stian Friestad
HSEQ Manager
Tel +47 902 27 751
tor.stian.friestad@not-as.no

Geir Ove Salte
Director
Tel +47 982 96 253
geir.ove.salte@not-as.no

Transport

We operate the following daily transport departures:
Bergen – Stavanger
Stavanger – Bergen
Stavanger – Kristiansand – Eastern Norway
Eastern Norway – Kristiansand – Stavanger

We can also assist with other destinations.

Please feel free to call our planners for transport prices on +47 982 96 251, or email them at post.zink@not-as.no; Fax: +47 51 79 18 60.

References – hot-dip galvanizing

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