WOOTZ AND CRUCIBLE STEEL
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Wootz was first made (that we know of)
nearly two thousand years ago, predominantely by the steel
makers of Central Asia and India. Some say that it was
made earlier still. It is a high carbon steel (1-3%C)
which was made from an ingot that was forged by hand into a
bar. In the bar state wootz will have a distinctive
layered pattern which looks similar to light reflecting off
water. It was this characteristic pattern which earned it the
title of “watered or damascus steel”. Wootz
has only one layer of steel with sheets of carbides that form
in the metal as it is forged. It is very difficult to
produce steel with this watered Persian Wootz pattern.
Other patterns are available through different
ingredients and processing methods. This is entirely
different from pattern welded damascus steel which is made of
different steels forge welded together.
It is almost impossible to define what
wootz is. There is much debate between scholars and
smiths (and between smiths themselves) over this subject. Some
say it is any carbon steel made in a crucible, others say that
it must have a destinct pattern. Modern wootz steel
naturally should have a chemical analysis relatively close to
the ancient wootz steels. It also should contain carbide
clusters which form the pattern in the steel. It also
should be produced using techniques similar to (or modern
equivalents of) the traditional methods. Much debate
comes from wheather a modern wootz is wootz if it has a
different pattern from the most famous persian wootz (Kara
Khorassan). There are many different patterns which
occurred in traditional wootz, these are sometimes referred to
by the location where they were forged; Persian wootz, Indian
wootz, Turkish wootz. These are basically variations of
the same metal which formed differing patterns of carbides, all
were wootz (however not all were Persian wootz). One day,
hopefully, wootz will receive a popular definition. My
thought is it will probably occur after we have discovered
exactly what the patterning mechanism is (no we are not
absolutely sure yet).
What I term patterned crucible steel has
the same composition as wootz but has a dendritic (fern-like)
pattern of carbides instead of the carbide sheets. When this is
forged into a blade the pattern can look quite similar to wootz
and will even form a kind of wavy carbide sheet; because of
this many people (also myself when I started) make crucible
steel and think they have Persian wootz when it is actually
dendritic. Persian wootz will have very close, straight,
parallel lines of carbides visible in a cross-section. Al
Pendray is the only person that I know who has been able to
consistantly make the true Persian Wootz.
This patterned crucible steel is still a
very high quality tool steel and is excellent for making
knives.
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Dendritic pattern from crushed dendrites
(flattened by forging) and grains
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Dendrites in an ingot before forging
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Persian Wootz water-like pattern from
cluster sheets of carbides.
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