Friday, September 16, 2016

What are the advantages of tin-free steel?

Tin-free steel is steel that has been rendered electronically passive by means other than tinning. Steel rusts in the presence of oxygen and dissolves in food to impart undesirable colors and flavors.

Steel companies introduced tin-free steel in 1965. It is a cold-rolled sheet steel product that has been thinly coated with metallic chrome oxide by electrolytic deposition. By placing an inert layer on the surface of the same low-carbon used for electrolytic tin-plating, it is at least partially protected against oxidation and dissolution.

The advantages of tin-free steel
*The base layer of chromium acts as corrosion barrier
*Excellent formability & strength
*Prevents rustling and iron oxide pickup
*Tin-free steel has a chemically stable surface and suitable for attractive printing
*Ease of fabrication
*Good chemical and thermal resistance. This allows an attractive finishing and a shorter time to place in a tunnel oven when high temperature lacquers are used.
*Organic coating adhere well
*Resistance to internal pressure
*Resistant to stains produced by sulphurs
*Excellent shaping and beautiful appearance

Tin-free steel requires a coating of an organic material to provide complete corrosion resistance. Although the chrome/chrome oxide makes tin-free steel unsuitable for welding, it also makes tin-free steel excellent for the adhesion of coatings such as paints, lacquers and inks.

Tin-free steel also has good formability and strength, but it is much cheaper than tinplate.
What are the advantages of tin-free steel?

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