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![[ Image : Iron Pillar at New Delhi, India ]](/assets/graphics/stories/photo_ironpillar.jpg) | Iron Pillar (New Delhi, India) | During
the Classical Age, India also perfected the Art of Iron Making.
The famous Iron Pillar of the late 4th and early 5th centuries AD,
which is seven metres high and weighs over six tonnes, now stands
serene near Qutab Minar, Delhi, having amazingly withstood the ravages
of time and clime, remaining rust-free for over 1,500 years. Essentially
made of wrought iron (99.7 per cent iron) and forge-welded out of
iron blocks of appropriate sizes, the Pillar has 0.144 per cent
of Phosphorus that aids anti-corrosion and contains no Manganese
and only negligible Sulphur, the composites that would cause corrosion.
This technique was not short-lived either. In the 111th century,
a much larger Iron pillar was Forge-Welded and now lies free of
rust in two or three pieces at Dhar in Central India. In the 13th
century, several iron Beams & Pillars were fabricated for use
in constructing the temples at Puri and Konark in Orissa. The Iron
Pillar of Delhi, however, remains unparallelled. Even in 1881, British
economic geologist V.Ball recorded:
It is not many years since the
production of such a pillar would have been an impossibility in
the largest foundries of the world, and even now there are comparatively
few places where a similar mass of metal could be turned out.
![[ Image : Detail of Dagger Made from Wootz Steel ]](/assets/graphics/stories/photo_wootzsteel.jpg) |
Dagger blade
made of Wootz Steel. (Rajasthan, India) |
An
equally remarkable micro-technology, namely, the production of High
quality Steel now known as Wootz Steel (an Iron-Carbon alloy with
1.3 to 1.6 per cent Carbon was also in use). This production technique
was particularly prevalent in South India and emerged as an accomplished
Metallurgical technique by about the 6th century, after which Indian
Steel was sought after for the production of what was termed the
Damascus sword in West Asia, around the 10th century AD. Metallurgists
in the Universities of Stanford and Iowa State (USA) have investigated
Wootz steel with a view to reproducing the ancient Indian process.
The former have even patented a process for the production of Utah-High-Carbon
steel (1.3 to 1.6 per cent carbon ) that could be used for certain
automobile and aeroplane components. |
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