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Grey Cast Iron
The
tensile strength of grey cast iron,
plastic and toughness are much lower
than cast steel, but it has a
considerable compressive strength as
same as cast steel, cast iron is also
commonly used in the worst mechanical
properties. Meanwhile, the matrix of
grey cast iron mechanical properties
also have some effect, the ferrite
matrix of grey cast iron graphite sheets
thick, strength and hardness of the
minimum, it is commonly used for the
stove parts and some low requirements to
tensile strength. Pearlite matrix of
grey cast iron has small graphite, have
a higher strength and hardness, the main
castings used to manufacture the more
important. Ferrite pearlite matrix of a
graphite cast iron pieces is thicker
than pearlitic grey cast iron, so has
worse performance than pearlitic grey
cast iron. So there are many demand in
industry for pearlite matrix of grey
cast iron.
Features of Grey Cast Iron:
Good casting properties, good vibration
damping, good wear resistance, good
machinability and low notch sensitivity.
In China, we classified the grey cast
iron degree by HT100, HT150, HT200,
HT250, HT300 and HT350. For
ASTM A48,
DIN 1691,
ISO 185,
JIS G5501 and
BS1452
standards, please check the blog of
Dandong Foundry.
The following is the common application
for each degree of grey cast iron for
your reference.
G100:
For small loads, the friction and wear
no special requirements for important
castings, such as protective cover,
cover, oil pan, hand wheels, frame,
floor, hammer, small handle, etc.
G150:
Under moderate load of castings, such as
the base, frame, box, knife, bed,
bearing seat, table, wheels, cover,
pump, valve, pipe, flywheel, motor
blocks and other
G200 and G250:
Requirements withstand greater load and
a certain degree of tightness or
corrosion resistance of the more
important castings such as cylinder,
gear, base, flywheels, bed, cylinder
block, cylinder liner, piston, gear box,
brake wheel, coupling Plate, medium
pressure valve, etc.
G300 and G350
Under high load, wear and high air
tightness important castings, such as
heavy machine tools, shears, presses,
automatic lathe bed, frame, frame,
high-pressure hydraulic parts, piston
rings, force larger gear, Cams,
bushings, large engine crankshaft,
cylinder block, cylinder liner, cylinder
head, etc.
Grey Iron Casting
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