"GASKET EXHAUST MANIFOLD" Sheet metal stamping process to The metal plate has a high ratio of strength to weight. So a piece of sheet metal is lightweight and strong. terials made of stainless steel sheet, stainless steel is an alloy steel. Alloys such as steel, which is caused by a reaction between. Oxygen with chromium in stainless steel texture. Of a thin film Protecting the damage to the body, stainless steel as well. Corrosion protection And not easily damaged or corroded metal.