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Hulamin
Integrated Annual Report 2017
 

Adding Value to Aluminium

Hulamin, as the leading semi-fabricator in Southern Africa, plays a key role in the local aluminium industry by unlocking and enhancing the extraordinary properties of aluminium for use in a broad and growing set of product applications on which society is dependent.

HOW WE ADD VALUE TO PRIMARY ALUMINIUM

REMELT AND CASTING

Bought-in scrap and scrap from Hulamin’s manufacturing processes are melted together with primary aluminium and alloying elements such as magnesium, manganese, zinc, silicon and copper in Hulamin’s remelt operation.

The molten metal is then treated, filtered and skimmed before being cast into rolling slab and extrusion billet, the feedstock for the rolling and extruding processes.

ADDING VALUE

By adding small amounts of other elements to pure aluminium, strong alloys are produced which can be further conditioned to our customers’ specifications.

ROLLING and finishing

The rolling process must produce plate, coil or sheet with not only accurate dimensions, but such other attributes as flatness, edge quality and correct thickness profile, specified physical properties and freedom from surface defects.

ADDING VALUE

Rolling
Hot rolling increases density, strength and ductility and cold rolling is used to further harden and strengthen the product, balancing between strength and ductility as required. Further finishing processes deliver the appropriate properties and qualities required for each specific product application, and include:

Annealing
A re-heating process performed to regulate the mechanical properties or permit further reductions in thickness during cold rolling.

Coating
The application of paint and lacquer to clean and pre-treated aluminium coil, followed by oven curing, is required for certain applications such as beverage can-ends.

Processing
Further processing is often required to obtain the appropriate widths, lengths or coil sizes, flatness and metal surface cleanliness required by customers. This is achieved through further processing through precision slitters, cut-to-length lines, shears, tension levellers, embossing rolls and degreasing lines.

EXTRUding

The completed extrusion is cut off the die, cooled, mechanically treated and aged to give it the required mechanical strength properties, and may be further coated, anodised and/or fabricated to provide the final specification required by the customer.

ADDING VALUE

Anodising
An electrochemical process where the thickness of the naturally occurring oxide layer of the aluminium is artificially increased. With the anodising process, a wide range of colours are available.

Powder coating
Profiles are pre-treated in order to clean and prepare the surface. Electro-statically charged powder is sprayed and attracted to the profile to form an even coating.

 

Primary markets and applications for our products

AUTOMOTIVE AND TRANSPORTATION

The use of aluminium is accelerating as it offers the fastest, safest, most environmentally friendly and cost-effective way to increase performance, fuel economy and reduced emissions while maintaining safety and durability.

Key properties
Lightweight, corrosion resistant, recyclable, strong and ductile.

Automotive clad tube stock and finstock
Used in the manufacture of automotive heat exchangers such as radiators, charge air-coolers, condensers and evaporators.

Plate and heat-treated plate
Used in the production of aerospace components, truck bodies, trailers, tankers, boats and train wagons.

Heatshield products
Used for containing heat within engine compartments.

ENGINEERING AND DURABLE CONSUMER GOODS

Extruded aluminium sections are used in the manufacture of various industrial applications and coated and uncoated building products are used within a wide range of structures in the building and construction industry.

Key properties
Corrosion resistant, excellent heat and electricity conductor, strong and ductile and aesthetically pleasing.

General engineering coil and sheet products

Used in items such as electronics, computers, office products and durable consumer goods.

Plate and heat-treated plate
Used in vacuum chambers for the manufacture of computer chips, plasma displays, distribution boards and numerous other applications.

Finstock products
Used in the manufacture of domestic and industrial airconditioning systems

Extrusions
Numerous applications and developing opportunities such as solar components.

BUILDING AND CONSTRUCTION

With aluminium’s durability, high strength-to-weight ratio, design flexibility and contributions to energy savings, it is the material of choice for architects and designers.

Key properties
Lightweight, corrosion resistant, good reflective qualities, strong and long life.

Painted and mill finish building coil and sheet
Used in a wide range of applications including roofing, cladding, ceilings, gutters and downpipes.

Extrusions
Used in the manufacture of various household frames and other industrial applications.

PACKAGING

Aluminium is preferred because it keeps food safe from harmful elements in the environment, the metal is impermeable and protects the flavour and integrity of the packaged contents.

Key properties
Lightweight, corrosion resistant, impermeable, odourless and recyclable.

Can body and coated can-end and tab stock
Used in the manufacture of cans for the beverage industry.

Converter foil
Used in the production of laminated cartons and confectionary packets for the food and beverage market. Household foil, rigid container foil, laminated foil, closure sheet.