What are Malleable Iron Fittings?

07 Sep.,2022


wholesale galvanized pipe fittings

Jun. 05, 2021

Malleable Iron Fittings hold two different piping components together to direct the flow of gases and liquids. Some malleable iron fittings are threaded, meaning they have grooves on the ends that allow the plumber to screw the fittings onto the pipe, allowing the plumber to connect the different pipes together.


Malleable iron fittings can come in black and galvanized finishes. The three forms of malleable iron include white center, black center, and pearlite malleable iron. White-centered malleable cast iron has ferrite in the surface area. Intermediate areas have tempered carbon, ferrite and pearlite. Tempering refers to the hardening of the metal. Black Malleable Iron Pipe Fittings consist mainly of ferrite. Pearlescent malleable cast iron is made of pearlite and other austenitic products. Pearlite is made of alternating layers of ferrite and smectite.

Black Malleable Iron Pipe Fittings


Malleable iron fittings come in a variety of shapes, depending on what the plumber will be using these fittings for. These shapes include elbows, which are bent fittings that send the pipe in a certain direction. Another type of fitting, the side outlet elbow, is the same as a regular elbow, but has an additional side outlet. A tee has three openings, two at either end of the pipe and one on one side. A side outlet tee has four openings, one of which is a side outlet. A four-way has four openings, each with a corresponding opening on the other side. These different fittings allow the plumber to send the pipe in different directions and allow the pipes to feed into each other.

Malleable Cast Iron

Malleable cast iron is an iron-carbon alloy that engineers treat by heating. When first cast, there is no graphite in the iron. All of the carbon content is in the form of hydrometallic. Malleable cast iron typically has 2% to 3% carbon, 1% to 2% silicon, 0 to 1% manganese and small amounts of sulfur and phosphorus. Malleable cast iron has high toughness due to its nodular graphite and low carbon content. The graphite is formed in such a way that the graphite is not spherical, but rather irregular in shape.


Engineers prefer malleable cast iron for parts that require coining, piercing or chill forming. Cold forming is the process of rolling or pressing a thin gauge steel plate into a usable material. Malleable cast iron works well for parts that need to have the most machinability, which means they are easy to make by machine. It is also suitable for parts that need to resist impact at low temperatures.

We also offer Carbon Steel Fittings, please feel free to contact us if you need them.