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Damascus steel is a form of ancient
steel. Its history connects with ancient Persian, Egyptian and
Indian craftsmen who produced this steel for sword making. Later
Japanese sword makers also adopted this technique for sword
making. Today, the reason for demand of Damascus steel is that
it is beautiful; it has variety of pattern-designs on the surface.
Damascus steel is in fact just pattern welded steel, just weld
together a few hundred layers of hard and soft steel and then
etch in acid. The acid attacks the hard and soft steels at different
rates resulting in a visible pattern on the steel. Today there
are many methods to produce Damascus steel and there is a lot
of variety of its patterns/designs but a few are available in
the market.
Its maximum hardness is 52 HRC,
which is good but not enough to compare it with the hardness
of modern materials. But its beauty makes it precious, that’s
why it is an expensive material, it is being use in Knife making
from many years and a very few manufacturers produce Haircutting
Scissors from this material which is very expensive.
There are some stories about Damascus
steel that it has magical beauty and it is indestructible, when
produced with fused diamond dust in it. In truth, Damascus is
just steel. It has no magical properties and is not indestructible,
nor is there any "diamond dust" in it, if you do put diamond
in it; it would just dissolve into the steel as regular carbon,
and would not impart any special properties.
The Damascus of legend was also
known as Wootz or Bulat and was a very high carbon crucible
steel. Bits of steel and iron and carbon are placed in a ceramic
crucible and heated at very high temperatures until it all fuse
together. The high carbon content (usually above 2% - most steels
used have less than 1% carbon) forms a lot of carbides, which
precipitate forming lines on the surface of the steel. It is
these lines of carbides that create the "watering" effect that
Damascus is so famous for.
Steel Composition:
There are no standard compositions for this material. Different manufacturers
in past, produced this material according to their own plan
with available resources. There is lot of research conducted
on it producing different patterns in different thickness and
in different shapes. Actually every new pattern has its own
specific requirements for adding Carbon, Manganese and Chromium,
similarly forging method and quantity of layer also has an impact
on its hardness and stress test.
According to our research, we found
these basic properties of Damascus steel, approximately similar
in every producer’s work in different techniques.
Carbon Volume: 0.50% to 6%
(According to Ancient specimen) - Normally 2%
Highest Hardness achieved: 45 to 52 HRC
Best tempering temperature: It depends on the composition
of both hard and soft steels.
Due to its high carbon content,
it is highly corrosive material and easily gets rusted if not
treated properly during production for longer life of parts.
Pattern Development:
The patterns that can be developed in the Damascus steel are
endless, but a few categories are available in the market.
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