Tag Archives: Crucible Steel

Early Modern Steel

Early modern steel included Blister Steel manufactured by the cementation process which was first made around the 16th century in Italy and soon after in England were it was produced in Coalbrookdale by Basil Brooke around 1610.  Wrought iron bars was the raw material used in the process, and was still used up till the 19th century.

Another early modern steel was Crucible Steel which was melted in a crucible rather then being forged.  This resulted in a more uniform structure with better composition throughout.  Earlier furnaces could not reach high enough temperatures to melt steel.  Modern crucible steel resulted from the invention of Benjamin Huntsman in the 1740’s. Blister Steel (same as above) was melted in a crucible in side a furnace, & cast into ingots normally.

Early modern steel era ended and Modern steel making era began with the Bessemer Process named after it’s inventor Henry Bessemer who took out a patent on the process in 1855. although this process had already been used centuries before in china and other countries it was not used on an industrial scale before.  The process was independently discovered in 1851 by William Kelly. The Bessemer process was the first inexpensive industrial process for mass production of steel from molten pig iron.  The key to the process is the removal of impurities from the iron by oxidation by air being blown through the molten iron.

the Bessemer Process which revolutionized steel manufacture by cutting cost and increasing production speed and decreasing labor requirements.  this brought the price of steel down to a similar priced wrought iron, which for the first time in history made steel an affordable material for building bridges or to be used in the frame work for buildings, most manufactures switched from wrought iron to steel after this. 

below is a picture of a Bessemer converter


Bessemer converter used in steel making

Steel History

For the first post on this site it will not be about steel buildings, but about the history of steel it’s self.  No one really knows exactly when and where steel was first produced however some of the first steel that we know of comes from East Africa dating all the way back to 1400 BC , in the 4th century steel weapons we produced in the Iberian peninsula.  Under the Han Dynasty in china in 202 BC to 220 AD steel was created by melting together Cast Iron with Wrought Iron to make a Carbon - Intermediate - Steel.

  Steel History 1        Another type of steel was produced in India and Sri Lanka around 300 BC.  called Wootz Steel and Damascus Steel,  Wootz Steel is Characterized by a pattern of bands and or sheets of micro carbides with in a tempered martensite or pearlite matrix.  Wootz Steel was widely exported throughout the region and became famous in the Middle East,  where it became known as Damascus Steel.  Damascus Steel is a hot forged steel used in Middle Eastern Sword making around 1100 -1700 AD.  Damascus Swords were legendary for there strength and sharpness,  legend has it they could cut through rock and cut through European swords that were of lesser strength.  The formula to create Damascus Steel has been lost in history.

Before the advent of modern metal alloys cast and hot rolled to construction beam sizes, sword makers of antiquity produced steel by the handful. Melting and casting a good alloy the size of a sword was difficult. Hollywood has described a fictional event where a crusader throws down his cast sword that shattered, for a damascene sword, taking home the folded hard and soft steels, changing European sword making forever. In actuality, folding/forging was well known. But this discovery of better metallurgy happened at the beginning of the age of alchemy, and so the legend of Damascus Steel was born.  Recent studies have suggested that carbon nanotubes were included in its structure, which might explain some of its legendary qualities, though given the technology available at that time, they were produced by chance rather than by design

Steel History 2

Crucible Steel was produced around the 9th and 10th century AD. in Merv.

There is evidence that in Song China in the 11th Century production of Steel using two techniques: a "berganesque" method that produced inferior, inhomogeneous steel and a precursor to the modern Bessemer process that utilized partial de carbonization via repeated forging under a cold blast.

more on the history of steel tomorrow

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