Cititech Industrial Engineering Pte Ltd

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Sheet Metal we commonly use

Sheet Metal We Cut

304 Stainless Steel

316 Stainless Steel

Stainless steels are naturally corrosion-resistant, however, stainless steel is not entirely impervious to corrosion. Stainless steel derives its corrosion resistant properties from its chromium content. The chromium, in the presence of air (oxygen), forms a thin film of chromium oxide which covers the surface of the stainless steel. Chromium oxide is inert or “passive” by nature, and chromium in the material gives stainless steel its corrosion-resistant properties.

Under ideal conditions, pure, cleaned stainless steel (SS) forms an inert, oxide film when exposed to oxygen in the atmosphere which protects the SS from corrosion. Under realistic, normal conditions, any of the following can inhibit the formation of the oxide film which protects stainless steel from corrosion:

foreign material in a manufacturing environment
sulfides added to the stainless steel for improved machinability
particles of iron from cutting tools transferred to the surface of the stainless steel parts

1100 Aluminium Sheet

2024 T3 Aluminium Sheet

5052 Aluminium Sheet

6061 Aluminium Sheet

7075 Aluminium Sheet

Mild Carbon Steel

Galvanized Steel

Finishing for Stainless Steel

1B: A No. 1 finish has rough, dull, and non-uniform appearance. There may be shiny spots were surface imperfections were removed by grinding. It is generally used in industrial applications, such as equipment for elevated temperature service.

2B: No. 2B is a general purpose cold rolled finish commonly used. It is more readily polished to high luster than a No. 1 hairline.

4B: No. 4 Finish is characterized by short, parallel polishing lines, which extend uniformly along the length of the coil. The final finish can be anywhere between 120 and 320 grit. Higher grit numbers produce finer polishing lines and more reflective finishes.

BA: Bright annealed stainless is sometimes buffed to attain a more mirror-like finish. It is often specified for applications where a highly reflective surface is desired.

Mirror (#8): The grit lines are much less visible, but they can be seen if the finish is examined closely. The resulting finish is mirror-like but not a perfect mirror.

Finishing and grade available depends on thickness.

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