Cast iron refers to an iron-carbon casting alloy with a carbon content of more
than 2.11%. It is a casting made directly after remelting using cast pig iron as
a raw material. There are many types of cast iron used in industry. According to
the form, structure and performance of graphite, it can be divided into gray
cast iron, malleable cast iron, white cast iron, ductile cast iron and
vermicular graphite cast iron. 1. Gray cast iron Cast iron cock gray cast iron
usually refers to cast iron with flake graphite, in which carbon is mainly
crystallized into free graphite, and the fracture is dark gray. Common cast iron
is mostly gray cast iron, which has excellent fatigue resistance and vibration
damping properties, so it is often used in automobile engine cylinders, gears,
governor wheels, brake discs and drums, and large machine tool bases. 2.
Malleable cast iron Malleable cast iron is obtained by graphitizing and
annealing treatment of white cast iron with a certain composition. Most or all
of the carbon exists in the form of clump graphite. Because malleable cast iron
has much higher plasticity and toughness than gray cast iron, it is customary
Called malleable cast iron, it is often used to make some important small parts.
It has been widely used in various fields such as automobiles, railways,
construction, electric power, textiles, home appliances, national defense, and
machinery manufacturing. 3. White cast iron White cast iron, also referred to as
white iron for short, is cast iron obtained by crystallization completely in
accordance with the Fe-FeC3 phase diagram.It is caused by the rapid local
cooling of gray iron or ductile iron in the mold. All are in the form of
carburite and the fracture is silvery white. Because white cast iron has a large
amount of hard and brittle FeC3. Therefore, white cast iron has high hardness,
high brittleness, and is difficult to cut. Therefore, it is rarely used for
direct manufacturing of machines, and is mainly used for steelmaking raw
materials or for manufacturing malleable cast iron blanks. 4. Nodular cast iron
Nodular cast iron is formed by spheroidization of molten iron before pouring,
and most or all of the carbon exists in the form of nodular graphite. Nodular
cast iron has good machinability, fatigue and high elastic modulus; due to the
trace amount of magnesium it contains, its rigidity, strength and impact
resistance are stronger than gray cast iron, but its vibration damping property
is worse than it. Therefore, ductile cast iron is mainly used to manufacture
various parts such as automobile, tractor chassis, machine parts and valves,
power circuit parts, etc. 5. Vermicular graphite cast iron is a kind of cast
iron obtained from liquid molten iron after modification and inoculation
treatment followed by cooling and solidification. Its graphite morphology is
between flake and spheroidal graphite. It looks like under an optical microscope
It looks like flakes, but is different from gray cast iron in that the flakes
are shorter and thicker, and the head is round (like a worm). Therefore, it can
be considered that vermicular graphite is a transitional graphite. Since the
structure of vermicular graphite cast iron is an intermediate state between gray
cast iron and nodular cast iron, the performance of vermicular graphite cast
iron is also between the two, that is, strength and toughness are higher than
gray cast iron, but not as good as nodular cast iron. Vermicular graphite cast
iron has good abrasion resistance, so it is suitable for manufacturing
heavy-duty worm
gear wholesalers machine bed, base, piston ring, hydraulic parts, etc.

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