96
dia
x
115
mm.Material
grade
is
specified
if
known.
Nominal
dimension
quoted
doesn’t
mean
exact
size.
Tolerance
values
aren’t
given.
I
will
combine
multiple
orders
and
SAVE
you
delivery
costs.
Maximum
postal
weight
is
20
kgs/
parcel.
Maximum
lengths
is
1.05M
I
charge
$5.50
fee
for
multiple
packing
and
associated
materials.
Attention
Multiple
buyers!
Please
consult
with
your
seller
regarding
postal
adjustments
before
making
payments.
Postal
insurance
remains
the
buyers
responsibility.
A
tax
invoice
is
supplied
with
the
sale.
Eggspurt
Metal
Analysis.
Click
here!
Weight
=
6.675
kgs
ALLOY
COLD
WORK
STEELS
"L.T.A.H"
Low
Temperature
Air-Hardening
Steel
(A.I.S.I.
Class
A6,
A.S.M.
426)
Nominal
Analysis:
Carbon
...'70%
Silicon
...'30%
Manganese2.00%
Chromium1.00%
Molybdenum1.45%
Features
and
Uses:
Sanderson's
"L.T.A.H."
Die
Steel
hardens
in
air
at
a
low
temperature,
with
all
the
advantages
that
this
feature
implies.
Deep
hardening
at
840°/860°C.
(1,544°/1,580°
F.),
a
temperature
some
160°C.
(320'
F.)
lower
than
is
needed
for
the
treatment
of
high
carbon
chromium
air
hardening
steels,
"L.T.A.H."
offers:‑
(1)
Outstanding
freedom
from
size-change
and
distortion.
(2)
Capacity
to
air
harden
right
through
even
in
the
largest
sections.
(3)
Toughness
with
good
hardness
and
wear-resistance.
(4)
Simplicity
and
economy
in
heat-treatment.
When
hardening
"L.T.A.H."
it
is
not
necessary
to
use
a
high
temperature
furnace
and
no
special
precautions
to
prevent
decarburisation
are
required.
The
steel
is
charged
into
the
furnace4vhich
has
previously
been
brought
to
the
hardening
temperature,
soaked,
removed
from
the
furnace
and
allowed
to
cool
in
air.
Pack
heating
or
heating
in
special
atmospheres
is
not
called
for.
(5)
Good
machinability.
"L.T.A.H."
is
specially
recommended
for
tools
of
heavy
or
intricate
sections.
Applications
include
heavy
forming
dies,
blanking
dies,
trimming
dies,
coining
dies,
notching
dies,
heavy
duty
punches,
mandrels,
retaining
rings,
shear
blades,
rim
rolls,
precision
tools,
spindles,
stripper
plates,
bending
tools.
Working
and
Heat
Treatment:
Forging.
Forge
at
1,050°/1,100°C.
(1,922°/2,012°F.).
Re-heat
when
temperature
falls
below
850°/900°
C.
(1,562°/1,652°
F.).
Slow
cooling
is
necessary
after
forging.
Allow
to
cool
down
with
furnace
if
possible;
otherwise,
cover
with
dry
lime
or
ashes.
Normalising.
Normalising
is
not
recommended
for
this
steel.
Annealing.
Pack
anneal
in
a
tube
or
other
closed
container
with
clean
cast
iron
borings
at
740°C.
(1,364°
F.).
Soak
according
to
the
instructions
on
page
40.
Cool
very
slowly
in
the
furnace.
Brinell
hardness
after
annealing
will
be
approximately
255.
Stress
Relieving.
For
applications
where
distortion
must
be
at
a
minimum,
we
recommend
stabilising
just
before
the
tools
are
finish-machined
in
order
to
relieve
machining
strains.
Heat
to
670°/700°
C.
(1,238°/1,292°
F.)
and
allow
to
cool
in
the
air.
Hardening.
Heat
the
steel
to
840°/860°
C.
(1,544°/1,580°
F.)
(upper
limit
for
larger
sizes).
Soak
for
at
least
twenty
minutes
at
the
temperature
and
allow
to
cool
in
air
(not
air
blast).
Pre-heating
is
not
essential.
Tempering.
Immediately
after
hardening,
re-heat,
preferably
in
an
air
circulating
tempering
furnace,
to
the
required
tempering
temperature
and
soak
for
one
hour.
Cool
in
air.
A
suitable
tempering
temperature
may
be
selected
by
reference
to
the
Tempering
Chart.
Grinding.