Chain Finishes
We
supply chains in a variety of finishes:-
Hot Galvanised
A
thin layer of zinc is applied to each link of chain after manufacture by
passing it through a bath of molten zinc. The resultant coating is dull
grey in colour with an uneven but fairly durable surface. This protects
the steel from the elements and therefore corrosion. Galvanised chain is
widely used where rust resistance is required and is therefore ideal for
outside applications.
Zinc Plated
A
similar process to galvanisation in that a zinc finish is used to protect the
metal against rust. A far thinner layer is applied, however, than for hot
dip galvanise making it less strong and less resistant to corrosion. Zinc
plated items are therefore not suited for use outdoors. Identified by its
smooth bright, bright appearance.
Black Plated
Black
plating - also known as black japanning - is a process where black lacquer or
varnish with a high bitumen content is applied directly to the chain and baked
at 200º C. The resulting finish dries quickly, is smooth, shiny and
durable. Popular for decorative reasons, it also protects chain against
rust. Black chain is therefore often used in fencing and gardening.
Hardened
Many
types of steel are heat treated to increase toughness and resistance to
wear. Known as hardening, this process involves heating steel then
cooling it rapidly. Hardening falls into two categories -
Through-hardening and Case-hardening.
Through-hardening is used on medium and high
carbon steels and treats the entire item, increasing its strength throughout.
Case-hardening is used on steel with a low
carbon content. Carbon is added to the surface of the item and some of
the interior. The result is a combination of high surface hardness and
internal toughness.
Hardened Boron Alloy
Boron
steel is one of the strongest types of metal available. It is extremely
durable and can only be cut using specialist laser technology or cutting
techniques. The choice for high level security.
Chain is a specialist commodity and advice is frequently
required. If you are uncertain as to which chain you need then please
contact us.