is the most common form of steel as its price is relatively low while it provides material properties that are acceptable for many applications. Mild steel has medium carbon contents (up to 0.8%) and is therefore neither extremely brittle nor ductile. It is also often used where large amounts of steel need to be formed, for example as structural steel. Another popular 
use is in steel wire mesh.MILD STEEL:With it's higher and greater strength mild steel has superiority over wrought iron in it's strength and consistency which it gives a much wider range of it's application, it also can be hardened by heat treatment. Mild steel does tend to corrode. No Warranty on this Product!

Steel that is coated with a zinc layer to protect it from corrosion. 
Galvanized steel is remarkably corrosion-resistant, because even if a scratch appears on its surface, the zinc coating will nevertheless protect the steel beneath.
A generally hard, strong, durable, malleable alloy of iron and carbon, usually containing between 0.2 and 1.5 percent carbon, often with other constituents such as manganese,
chromium, nickel, molybdenum, copper, tungsten, cobalt, or silicon, depending on the desired alloy properties, and widely used as a structural material. Zinc coatings prevent corrosion of the protected metal by forming a barrier, and by acting as a sacrificial anode if this barrier is damaged. When exposed to the atmosphere, zinc reacts with oxygen to form zinc oxide, 
which further reacts with water molecules in the air to form zinc hydroxide. Finally zinc hyroxide reacts with carbon dioxide in the atmosphere to yield a thin, impermeable, tenacious and quite insoluble dull gray layer of zinc carbonate which 
adheres extremely well to the underlying zinc, so protecting it from further corrosion, in a way similar to the protection afforded to aluminium and stainless steels by their oxide layers. Zinc, which has been used to hot-dip-galvanize steel for 250 years, provides 50 to 75 years of corrosion protection in many environments. Empirical data collected about hot-dip galvanized (HDG) steel field performance from 1940 to 1980 in environments ranging from industrial to marine to suburban indicates that zinc can prevent base steel corrosion more than other surface treatments. 
Because of zinc’s long-lasting protection, projects require no maintenance and therefore no maintenance costs.

Aluminum for its resistance to oxidation, components are powder-coated, then joined into sections using screws or retaining rods.Sections attach through brackets or holes punched in the posts. Aluminum ornamental should be considered for harsh coastal environments or when corrosive chemicals are nearby. 

Aluminum is the chemical element in the periodic table with the symbol Al and atomic number 13. A silvery and ductile 
member of the poor metal group of elements, aluminum is found primarily as the ore bauxite and is remarkable use to the phenomenon of passivation), its strength, and its light weight. Aluminum is used in many industries to make millions of different products and is very important to the world economy. Structural components made from aluminum are vital to the aerospace industry and very important in other areas of transportation and building in which light weight, durability, and strength are needed. This has Limited Lifetime Warranty

from Our Supplier!If corrosion is more of a maintenance concern than strength and rigidity, aluminum may be your best alternative. off-screen area