Iron: historical information

Iron was known in prehistoric times. Genesis stated that Tubal-Cain from Adam's seventh generation was "all instructors of brass and iron artists". Ferrous iron products were discovered around 3000 BC. Today, in Delhi of India there is still a famous iron pillar dating back to around the year CE. This sturdy pillar is made of wrought iron and is about 5 meters high and 40 centimeters in diameter. It has been exposed to the weather since installation, but the corrosion of the pillar is still small

Shortly before the collapse of 1803, the British John Dalton said that by assuming that the material consists of atoms and that all samples of the given compound consist of the same combination of these atoms I can explain the result. Dalton also pointed out that in a series of compounds, the mass ratio of the second element combined with the first element of a given weight can be reduced to a smaller integer (multiple law of ratios). This is further evidence of atoms. Dalton Thomson's atomic theory was published by Thomas Thomson in the third edition of the "Chemical System" of 1807, and the paper on oxalate was published in "Philosophy Transactions". Dalton announced these views in the new chemical philosophy system the following year. The Dalton iron symbols are as follows. [Chemical History, Sir Edward Thorpe, Volume 1, Watts & Co, London, 1914]. ]

From the historical and cultural point of view, iron ore industry is closely related to coal mining, as two materials are required for steelmaking. Steel is an alloy of iron and carbon, iron is the main component. (Several types of steels, including stainless steel, contain additional metal in the mixture.) The carbon in the steel comes from coal, which is 2% of the finished steel. Steel is much stronger than pure iron and most of the extra strength comes from the interaction between iron and carbon atoms.

Steel is an alloy of iron and a small amount of carbon, but considering that the cost of steel is higher than wrought iron, the history of steel and iron making can be used for various products. The main difficulty in manufacturing steel is to achieve a higher melting point than pig or cast iron in large-scale production, until the development of a method to introduce air or oxygen which allows direct conversion by oxidizing carbon in molten pig iron It is difficult to do. From hot metal to molten steel

Wrought iron is no longer produced on a commercial scale. Many products known as wrought irons, such as guardrails, garden furniture, gates, are made of low carbon steel. They retain this explanation as they have the appearance of wrought iron previously made of wrought iron. True wrought iron is necessary to truly protect historical buildings. Ferro silicon is the basis for the manufacture of prealloys such as ferrosilicon (FeSiMg) for modifying fusible malleable cast iron. FeSiMg contains 3 to 42% of magnesium and a small amount of rare earth metal. Ferro silicon is also important as additive to cast iron to control the initial content of silicon.

Wrought iron is the purest iron that you normally encounter or mass-produced. It can contain as little as 0.04% by weight of carbon. From the conventional manufacturing method, the wrought iron has an internal fiber structure. For high quality wrought iron forging, the orientation of these fibers during the forging process is taken into account, as the strength of the material is consistent with the particles rather than the whole particles. Most of the remaining impurities from the initial smelting become concentrated in the silicate slag confined between the iron fibers. This slag produces fortunate side effects in the forging welding process. As the silicate melts, it self-melts the wrought iron. The slag becomes liquid glass and covers the exposed surface of the wrought iron to prevent oxidation. Otherwise it will hinder the successful welding process.