The Iron Metal Of Steel

1692 Words Mar 22nd, 2015 7 Pages
Introduction

Stainless Steel is a generic term for a large family of corrosion resistant alloys from iron (FE), are containing carbon (C) and chromium and may contain other alloying elements to get different properties of steel like Nickels, Molybdenum, Titanium and Manganese.
Steel metal is the most common and most widely used in major construction industries because it 's can be malleability to sheets, beams and bars, and also its very god to transfer the heat, electric and liable to Magnetization.
There are no limited period on the discovery of steel, but the period since 300 BC _ 200 BC is a period in which the human use of mild of steel , it’s been industries, home tools, war and hunting tools such as swords and shields.
The modern
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With over 11% chromium, steel is about 200 times more resistant to corrosion than mild steel. These steels can be divided into five type
Stainless steels can be divided into five categories:
1. Martensitic Stainless Steels:
These alloys have a chromium content that ranges from 11.50 to 18.00%. They have relatively high carbon content from 0.15 to 1.20% compared to other stainless steels and molybdenum can also be used. These grades can be hardened through heat treatment to offer strength and hardness. They are magnetic. The common uses are knife blades, surgical instruments, shafts.

2. Ferritic Stainless Steel:
Alloys In ferritic grades, carbon is kept to low levels (C<0.08%) and the chromium content can range from10.50 to 30.00%. only chromium is present as the main metallic alloying element. Common uses are automotive exhaust systems (11.00%Cr), automotive trim (17.00%Cr-1.50%Mo), hot water tanks (18.00%Cr-2.00%Mo-Ti).

3. Austenitic Stainless Steels:
Alloys In austenitic grades, carbon is usually kept to low levels (C < 0.08%). Chromium content ranges from 16.00 to 28.00% and nickel content ranges from 3.50 to 32.00%. This chemical composition allows them to maintain an austenitic structure from cryogenic temperatures up to the melting point of the alloy. These alloys cannot be hardened through heat treatment. The key properties of these types of stainless steel are excellent corrosion resistance, ductility and
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