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Iron and Carbon Make Wonderful Things When Allied With An Alloy

We've grown up hearing about stainless molybdenum contents and nitrogen
steel our whole lives. But how many additions, as well as higher nickel
people actually know what it really is? content. Because of these additions, they
Let's take a look at the process of have a tremendous resistance to chloride
making steel stainless and some of its pitting and crevice corrosion. Other
general applications. types of stainless steel include
English metallurgist Harry Brearley martenistic, ferritic and duplex, all of
invented stainless steel in 1912 while he which have different compositions and
was researching alloys to protect cannons strengths suited to various applications.
from erosion. The first commercial When its composition is 18 percent
production of stainless steel occurred in manganese and 10 percent nickel, it is
August 1913. A few years later, stainless often referred to as 18/10 stainless
steel played a key role in building steel, which is often used in
valves for aircraft engines during World high-quality flatware. There are many
War I. By the 1920's, people were finding different grades and surface finishes of
myriad uses for stainless steel in stainless steel, which makes the material
America. Most famously, the seven arches very adaptable to numerous applications.
on top of the Chrysler Building in New Look at the watch on your wrist. It's
York City were clad in stainless steel in likely made from stainless steel. It is
1929. also to make airplanes, surgical
Chemically speaking, stainless steel is appliances, building materials, cookware,
defined as an iron and carbon alloy with cutlery, hardware, cars and jewelry.
a minimum of 11.5 percent chromium Mill finishes can be applied to flat
content. Its name indicates some of its rolled stainless steel with the use of
properties, because it does not stain or mechanical abrasives and the rollers
rust as easily as ordinary steel. It is themselves. After it is rolled to size
also sometimes referred to as corrosion and annealed, oxidation is removed and
resistant steel. It should not be the passivation layer is made on its
confused with galvanized steel. surface. At this time, a final finish can
Galvanized steel is dipped into zinc to be added to enhance the appearance of the
prevent corrosion. Galvanized steel is steel.
created when the zinc goes through a For example, a sheet may have a matte
reaction with the iron molecules. The finish to it, where the face of the
most external layer is all zinc, but material is abrasively polished leaving a
successive layers are a mixture of zinc clean but dull sheen to the surface. This
and iron, with an interior of pure steel is often desired where the material will
in galvanized steel. be used in a high visibility, high use
Manganese is often found in many location; the surface will not show
stainless steel compositions. Manganese scratches and scars as readily as a
preserves an austenitic structure in the highly polished finish.
steel akin to nickel, and it is less Stainless steel is available in both hot
expensive. Austenitic stainless steel rolled steel sheets and cold rolled steel
makes up about 70 percent of the world's sheets, and it can also be obtained in
overall stainless steel production. Super plates, rolls, strips, foil and bars.
austenitic stainless steels have high




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