Main Product Group
The most common steel product is metal coated steel. Manufacturers usually use cold-rolled steel (although a small percentage is made from hot-rolled coils or sheets) which is then coated with zinc or tin. Coatings are often added to zinc-coated steel at a later step in the process to produce color-coated steel.
Zinc Plated Steel
There are several types of zinc coating (or galvanizing). This is
Hot Rolled Steel coil: in this process, the cold-rolled coil or sheet is immersed in a pot of molten zinc. A common manufacturing method for hot dip galvanizing steel is the Sendzimir process (which uses a small amount of aluminum in the coating). Continuous hot dip galvanizing is currently the most popular method of producing coated steel. Common applications of this steel include construction (roofs, walls – often as sandwich panels), automotive body parts (exposed panels), fabrication (metal cabinet frames and walls), agriculture (outhouses, animal buildings, silos), heating and ventilation (case). ). , air stream); and it is very common for galvanized steel to be more covered (see below) for many of these uses.
Hot rolled carbon steel coil– used for small batches in a discontinuous batch process. Typical products may include lamp posts, antenna posts, radio towers, road barriers, power transmission lines, camera posts, motorway crash barriers, systems of pedestrian bridges, garden frames, galvanized or mesh cables, street furniture, advertising poles, boilers, channels, welding. tubes and other profiles, etc. The production process usually involves dipping shaped steel mills into the molten demand, which can be up to 12 meters long.
Electrolytic galvanizing – a fairly popular coating technique produces zinc-coated steel with a layer of 25-100 g/m2 per side – although capital costs, operating costs and market preferences have shifted demand from electro galvanizing to in continuous hot dip galvanizing over the years – last year. .
Galvalume – which involves the application of 45% Zinc-55% aluminum alloy. Galvalume is particularly suitable for highly corrosive environments [eg. sea air] and suitable for roof, exposed panels, unexposed car parts, etc. [Galvalume is a registered trademark of BIEC International Inc].
Galvanneal:
here the application of a zinc layer is followed by heat treatment to form a Zn-Fe alloy (8-15% Fe and total 100-120 g/m2) with a very high surface quality. The product is suitable for paint coating and is easy to weld. Steel grades can range from mild deep drawing to high strength low alloy Cold Rolled Steel Coil and Sheet Prices .
Organic coated steel (also known as ‘coloured coated steel’) is a zinc coated steel product – usually, it is made from hot dip galvanized steel. Here, galvanized rolls or sheets are painted with an organic coating such as PVC or polyester resin, which provides greater surface durability. As a result, the useful life of steel can be extended to 20 years or more, because corrosion is prevented by the additional protection of the extra organic layer.
Tin plate
Tin plates are popularly used in beverage cans, for food packaging, as well as in the chemical industry [aerosols, paints, oil cans etc]. Despite the name, tinplate actually takes one of two forms:
One form is cold-rolled thin gauge steel electrolytically coated with tin.
Another form is called tin-free steel, and uses chrome plating instead of tin plating. Producing a less shiny finished product, lead-free steel was introduced several years ago in an effort to reduce packaging costs when lead prices rose to record highs. Most tin-coated steel today is still made as tin plate rather than untinned steel.
There are several other coatings on the steel market, and these include nickel-zinc coatings [favored by some automotive manufacturers] and terne-coated steel [which uses lead – often for applications such as gas tanks ]
