What are Sheets?

Sheet metal is metal formed by an industrial process into thin, flat pieces. Sheet metal is one of the fundamental forms used in metalworking, and it can be cut and bent into a variety of shapes. Countless everyday objects are fabricated from sheet metal. Thicknesses can vary significantly; extremely thin sheets are considered foil or leaf, and pieces thicker than 6 mm (0.25 in) are considered plate steel or “structural steel”.

Sheet metal is available in flat pieces or coiled strips. The coils are formed by running a continuous sheet of metal through a roll slitter.

There are many different metals that can be made into sheet metal, such as aluminium, brass, copper, steel, tin, nickel and titanium. For decorative uses, some important sheet metals include silver, gold, and platinum (platinum sheet metal is also utilized as a catalyst).

What are Sheets Used For?

Sheet metal is used in automobile and truck (lorry) bodies, airplane fuselages and wings, medical tables, roofs for buildings (architecture), and many other applications. Sheet metal of iron and other materials with high magnetic permeability, also known as laminated steel cores, has applications in transformers and electric machines. Historically, an important use of sheet metal was in plate armor worn by cavalry, and sheet metal continues to have many decorative uses, including in horse tack. Sheet metal workers are also known as “tin bashers” (or “tin knockers”), a name derived from the hammering of panel seams when installing tin roofs.

Materials for Sheets

Perforated

How Are Sheets Made

Sheet metal coils after hot rolling and pickling can be used as what is known as a hot band. If special finishing is needed, further processing is done starting with cold rolling to make the sheets even thinner. After that, the sheet metal coils can go through other finishing processes.

Galvanising

Galvanising is the process of zinc coating the steel sheets for corrosion resistance.

Tinning

Tinning is the process of tin coating the steel sheets for food cans.

Anodising

Anodising is used for aluminium to create a thicker protective oxide layer.

Annealing

Annealing is used to make the metal sheets easier to bend and form.

Tempering

Tempering is used to add hardness and create surface textures in the metal sheets using special rollers.

Types of Sheets

Austentic Stainless Steel Sheets

Austenitic stainless is a non-magnetic – any of the 300 series steel – that contains high levels of chromium and nickel and low levels of carbon. Known for their formability and resistance to corrosion, these are the most widely used grade of stainless steel.

Ferritic Stainless Steel Sheets

Ferritic – Stainless steels that are magnetic, non-heat-treatable steels that contain 11-30% chromium but with little or no nickel. Typically employed for non-structural uses where either good corrosion resistance is needed such as with seawater applications or decorative applications where aesthetics are the main concern. These metals are most commonly found in the 400 series stainless steel.

Martenstic Stainless Steel Sheets

Martensitic – A group of chromium steels ordinarily containing no nickel developed to provide steel grades that are both corrosion resistant and hardenable via heat-treating to a wide range of hardness and strength levels.

Cold Rolled Steel (CRS) Sheets

A process in which hot rolled steel is further processed to smooth the finish and hold tighter tolerances when forming. CRS comes in 1008 and 1018 alloys.

Pre-plated Steel Sheets

Sheet metal material that is either hot-dipped galvanized steel or galvanealed steel, which is galvanized then annealed. Galvanization is the process of applying a protective zinc coating to steel in order to prevent rust and corrosion. Annealing is a heat treatment process that alters the microstructure of a material to change its mechanical or electrical properties, typically reducing the hardness and increasing the ductility for easier fabrication.

Aluminium Sheets

Outstanding strength to weight ratio and natural corrosion resistance, aluminum sheet metal is a popular choice in manufacturing sectors meeting many application requirements. Grade 1100 offers excellent corrosion resistance, excellent workability, as well as high thermal and electrical conductivity. Often found in transmission or power grid lines. Grade 3003 is a popular alloy for general purposes because of its moderate strength and good workability. Used in heat exchanges and cooking utensils. Grade 5052 and 6061 are commonly found in metal fabrication. Grade 5052 is the most widely used alloy best known for being among the stronger alloys while still formable, weldable, and corrosion-resistant. Grade 6061 is a solid structural alloy most commonly used in extrusions or high strength parts such as truck and marine frames.

Copper / Brass Sheets

With lower zinc content brasses can be easily cold worked, welded, and brazed. A high copper content allows the metal to form a protective oxide layer (patina) on its surface that protects it from further corrosion. This patina creates an often highly desirable aesthetic look found in architectural or other consumer-facing products.

Applications of Sheets

Construction

Metal Fittings

Kitchen & Home Appliances

Automobile Parts

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