The wall mounted mailbox manufacturer tells you that stainless steel represents the closest group of engineering materials to the present time. The wall mounted mailbox manufacturer tells you that although it was invented in the early twentieth century, it was only popularized decades before it was used. It was not developed and widely used until after the Second World War.

The main reason why stainless steel letter box manufacturers choose this material is: one of the most important characteristics of this material is their corrosion resistance. Corrosion resistance, combined with good mechanical properties and manufacturing characteristics, makes it an extremely versatile material. In many cases, wall mounted mailbox manufacturers tell you that they provide designers with the only economically feasible alternative, especially It is the field of stainless steel letter box production.
What causes this material to not rust?
The wall mounted mailbox manufacturer tells you that it is an alloy of iron (Fe) and chromium (Cr) with a controlled amount of carbon (C). They are steels containing at least 11% chromium, and their main property is corrosion resistance. If more 11% of chromium is added, a protective passive film will be formed. The higher the chromium content, the stronger the passivation film.
The wall mounted mailbox manufacturer tells you that other elements such as molybdenum (MO) and nitrogen (N) further strengthen the passivation film and improve corrosion resistance. If the passivation film is removed or damaged, it will spontaneously reform in the presence of air or water.
Why is nickel added? Nickel-made austenitic stainless steel has excellent properties of austenitic grades, namely weldability, formability and toughness.
Classification and rating:
Since its invention and initial development, the number of its grades has increased rapidly, and hundreds of different chemical components worldwide have been deterred.
Since the microstructure of steel determines its performance, it is traditionally divided into several categories based on its structure. This gives a rough classification in terms of composition and properties.
Martenstic: a pure chromium alloy with a higher carbon content. It is included in the American Iron and Steel Institute (AISI) 400 series. These steels have moderate corrosion resistance and exhibit high strength and hardness through heat treatment. They have poor weldability and good magnetism.
Ferrite: It is an ordinary chromium alloy with a low carbon level and is also included in the AISI series. The wall mounted mailbox manufacturer tells you that these steels have moderate to excellent corrosion resistance depending on the chromium content. Except for thin gauges, they cannot be strengthened or hardened, and the weldability is poor. And they are magnetic.
Austenite: These steels are included in the AISI 300 and AISI 200 series and contain nickel with low to very low carbon content. Wall mounted mailbox manufacturers tell you that these materials have excellent corrosion resistance and high temperature oxidation resistance. Strength and hardness can be improved by cold working. They have excellent low temperature performance. The wall mounted mailbox manufacturers tell you that they are non-magnetic. In 200 series steels, nickel is partially replaced by manganese. These variants have performance similar to the 300 series, but with higher strength and lower corrosion resistance. The general stainless steel letter box is made of this material.
Duplex: These steels contain less nickel than austenitic alloys and have a very low carbon content. The wall mounted mailbox manufacturer tells you that they have a two-phase (mixed) crystal structure of ferrite and austenite. Wall mounted mailbox manufacturers tell you that these steels have excellent corrosion resistance, especially pitting corrosion, crevice corrosion and stress corrosion cracking. They also have high strength, excellent weldability and magnetism.