Sheet Metal

Before explaining the types of sheet metal, let us first understand what is sheet metal?

Definition of Sheet Metal

Sheet metal is a processing technology and has not yet had a relatively complete definition.

According to a definition in a professional journal, it can be defined as:

Sheet metal is a comprehensive cold working process for metal sheets (usually below 6mm), including shearing, punching/cutting/, folding, riveting, splicing, forming (such as car body) etc.

Its remarkable feature is the same thickness of the same part.

Types of Sheet Metal

Types of Sheet Metal

Commonly used sheet metal materials can be divided into two categories, which are:

  • Galvanized steel
  • Stainless steel

Galvanized steel

Galvanized steel can be mainly divided into:

  • Electro-galvanized sheet
  • Hot-dipped metallic-coated sheet

Let’s compare the above two galvanized sheets of steel through a table.

Electro-galvanized sheet (EG/SECC)Hot-dipped metallic-coated sheet (GI)
Base metalCold rolled annealed steelCold rolled hard steel plate
Pre-treatmentElectroplatingHot dip
Zinc platingHard plating for thickHard plating for thin
Plating surfaceThe zinc layer is adsorbed on the surface of the steel, and the surface is smooth and free of zinc spangle.Solidified structure of zinc layer, may have zinc spangle or not.
Plating organizationPure zinc coatingThe outermost layer is pure zinc and the inner layer is iron-zinc alloy.
Mechanical performanceSame as the base metalAfter annealing, it has age hardening; the material is soft.
Max material thicknessCommon material thickness can be seen0.6-1.5mm
Corrosion resistanceThin coating, poorThe plating is thick and good. Can be added with anti-fingerprint coating
PriceExpensiveCheap

Stainless Steel

It is a general term for stainless acid resistant steel which resistance to atmospheric, acid, alkali, salt and other media corrosion

To achieve stainless corrosion resistance, the amount of chromium (Cr) should not less than 13%;

In addition, nickel (Ni) or molybdenum (Mo) may be added to increase the effect.

Due to the different types and contents of alloys, there are many types.

See also:

Stainless steel

Stainless steel features

Good corrosion resistance, good brightness, high strength; with a certain elasticity; expensive.

Stainless steel material properties

Ferritic stainless steel

It has a high content of Cr and has good properties and high-temperature oxidation resistance.

Austenitic stainless steel

Typical grades like Cr18Ni9 and Cr18Ni9T1.

Non-magnetic, good corrosion resistance, good temperature strength and high-temperature oxidation resistance, good plasticity, good impact toughness, no gap effect, excellent weldability, and therefore widely used.

Such steels generally have low strength, low yield strength, and cannot be strengthened by heat treatment. But after cold pressing, the tensile strength is high and the elasticity is improved.

However, its strength obtained by cold drawing at high temperatures is easily weakened and should not be used to withstand high loads.

Martensitic stainless steel

Typical grades like 2Cr13 and GX-8.

With magnetic property; has excellent shock absorption and good thermal conductivity; has high strength and yield limit. After heat treatment and strengthening, it has good comprehensive mechanical properties.

Because of the high carbon content, it needs to be tempered after welding to eliminate stress.

It’s mainly used for load-carrying parts.

See also: