Carbon steel is a type of steel that has carbon as its main alloying constituent. 85% of all steel used in the United States is carbon steel. The American Iron and Steel Institute (AISI) defines carbon steel as: "Steel is considered to be carbon steel when no minimum content is specified or reqired for chromium, cobalt, columbium, molybdenum, nickel, titanium, tungsten, vanadium or zirconium, or any other element to be added to obtain a desired effect."
There are five main types of carbon steel:
0.05% - 0.15% Carbon content. The most common type of steel used in many applications due to its lower cost.
0.16% - 0.29% Carbon content. Lower cost and malleable but has a low tensile strength.
0.30% - 0.59% Carbon content. Balanced between ductility and strength.
0.60% - 0.99% Carbon content. Very strong.
A silvery white metal of the boron group of chemical elements with the symbol Al and an atomic number of 13. Aluminum is a soft, non-magnetic, lightweight, ductile and malleable metal. Pure Aluminum is to soft for most uses so alloys are used to increase the strength to weight ratio. Aluminum alloys form a protective layer of aluminum oxide in dry environments that help them retain there sine and luster.
Aluminum can be cast or wrought alloys. 85% of aluminum is used for wrought products such as extrusions and foils. There are different designations for cast and wrought alloys. For wrought alloys there are eight different series that are designated by a four digit number representing the element that the aluminum is alloyed with. Additionally, the alloy is assigned a temper designation, represented by a dash, a letter and a one to three digit number, e.g. 6060-T6.
1000 Series - Basically pure aluminum
2000 Series - Alloyed with copper
3000 Series - Alloyed with manganese
4000 Series - Alloyed with silicon
5000 Series - Alloyed with magnesium
6000 Series - Alloyed with magnesium and silicon
7000 Series - Alloyed with zinc
8000 Series - Alloyed with lithium