because it's a tough matter
Iron as a metal in the pure form is somewhat fragile. But iron mixed with some impurities like Carbon is very strong which is used in the construction of bridges. This iron mixed with impurities is called as Cast Iron.
Almost certainly, iron is our most common refined metal. Used in bridges, cans, autos, steamships, railways.
It is used for producing cast iron cannons, bridges and Cast iron collums.
The problem with iron bridges was that the material was not as reliable as carbon steel, so it was replaced starting in the late 1800s and was completely unavailable for bridge building by the early 1900s. Bridges in the late 1700s were made of cast iron, but, by the early 1800s, cast iron gave way to wrought iron.
A cast iron railing is a metal railing.
Truss Bridges=Trusses have been used extensively in bridges since the early 19th Century. Early truss bridges were made of wood.==in additon the classic American covered bridges are all trusses, though the wooden truss members are covered by walls and a roof, for protection from the elements. Later truss bridges were made of cast iron and wrought iron. Most modern trusses are made of structural steel.=
Because iron is a metal and its a property of every metal that they are good conductors of heat ............
Corrosion and rust could be problems with iron bridges.
white iron is metal
The metal free weights are made from cast iron.
because the cast iron is a ferrous metal
Iron is a very good type of metal and its also a good conducter