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High Toughness Feature of Malleable Cast Iron

Nov. 26, 2021

The structure of malleable cast iron is sub-stable carbides in a pearlitic matrix. By annealing heat treatment, the brittle tissue is transformed into a malleable form. Malleable cast iron typically contains 2% to 3% carbon, 1% to 2% silicon, 0% to 1% manganese, and small amounts of sulfur and phosphorus. The high toughness of malleable cast iron makes it useful in various industries. Malleable cast iron pipe fittings manufacturer BONA invites you to keep reading.

Castability, heat treatment

Malleable cast iron has been used since the 4th century B.C., and Chinese archaeologists have found malleable cast iron products between the 4th and 9th centuries B.C.

Like similar iron rods where carbon forms a spherical or spheroidal shape, malleable cast iron has good ductility. Because of its lower silicon content, malleable cast iron also exhibits better fracture toughness properties than other ductile irons in low temperature environments. The tough-brittle transition temperature is lower than many other ductile iron alloys.

After casting and heat treatment processes, malleable cast iron can be formed by cold working, such as stamping for straightening, bending or stamping operations. This is possible because malleable cast iron has the desirable property of being less sensitive to strain rates than other materials.

Malleable Iron Fittings

Malleable iron fittings hold two different pipe components together and guide the movement of gases and liquids. Some malleable fittings are threaded, which means they have fluted ends that allow the plumber to screw the fittings onto the pipe, allowing the plumber to connect the different pipes together.


Extensible fittings come in a variety of shapes, depending on the application in which the plumber will be using them. These shapes can include elbows, which are curved fittings that feed the pipe in a specific direction.

A tee has three openings, two at the ends of the pipe and one on one side. Side exit tees have four openings, one of which is a side exit.

Crosses have four openings, each with a corresponding opening on the other side. These different fittings allow the plumber to feed the pipe in different directions and to feed the pipes to each other.

BS Standard Malleable Iron Pipe Fittings Cross


It is typically used for small castings that require good tensile strength and the ability to bend without breaking (ductility). Uses include electrical fittings, hand tools, pipe fittings, gaskets, brackets, fence fittings, power line hardware, agricultural equipment, mining hardware, and machine parts. Malleable cast iron is suitable for parts that require the highest machinability, which means they can be easily machined. It is also suitable for parts that need to resist impact at low temperatures.

BONA factory

Grown from a malleable iron pipe fittings factory, by our unremitting effort and valuable reputation we are now strong to more business field. Our pipes and pipe fittings have won great reputation of customers for its accurate geometry, excellent mechanical function, hermetical sealing and good interchangeability. If you are going to buy the pipe fittings from China, please contact us today, we'd be happy to have cooperation with you.

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