The Difference Between Ductile Cast Iron and Malleable Cast Iron

As a manufacturer of pipe fittings, JIANZHI are fully aware of the differences between ductile iron and malleable iron. If you would like to know too, please read on!

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The key manufacturers of Malleable Cast Iron pipe fittings and ductile iron pipe fittings, flanges, elbows, tees, reducers, heads, manholes and other pipe fittings, full specifications, in stock! Flange pipe fittings factory material good, good technology, support the heterogeneous custom!

Malleable Cast Iron

1. Overview of malleable cast iron

Malleable cast iron, abbreviated as malleable iron, is the primary material of Jianzhi malleable iron pipe fittings.First, malleable iron is poured into white iron castings and then subjected 

to malleable annealing (the malleable annealing decomposes the cementite into flocculent graphite) to obtain malleable iron castings. The chemical composition of malleable cast iron 

is: wC=2.2%～2.8%, wSi=1.0%～1.8%, wMn=0.3%～0.8%, wS≤0.2%, wP≤0.1%. 

Contact the manufacturer of ductile iron and malleable iron fittings for professional answers

Malleable Iron Pipe Fittings catologs

There are two types of organization of malleable iron:

(1) Ferrite (F) + flocculent graphite (G);

(2) Pearlite (P) + flocculent graphite (G).

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2. The properties and uses of malleable cast iron

(1) The properties of malleable iron

The cutting performance of white cast iron is abysmal. Still, after high-temperature tempering, it has higher strength and plasticity and can be cut because the graphite in malleable cast iron is in the form of flocs has a small splitting effect on the matrix. Its mechanical properties are higher than grey cast iron, and its plasticity and toughness are good. But, the malleable cast iron cannot be forged. The matrix structure of malleable cast iron differs, with different performances. Among them, black-core malleable cast iron has higher plasticity and toughness, while pearlite malleable cast iron has higher strength, hardness and wear resistance.

(2) Uses of malleable iron

Black-hearted malleable cast iron has low strength, hardness, good plasticity and toughness. It is used for parts with low load and high impact and vibration.

Because of its high strength and hardness, pearlite matrix malleable cast iron is used for critical parts with high load, wear-resistance and specific toughness requirements.

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3. Several general malleable cast irons

(1) Cast iron grades KTH300-06, KTH330-08, KTH350-10, KTH370-12: used to manufacture pipe fittings, low-pressure valves, rear axle housings of automobile and tractors, steering mechanisms, machine tool parts... Jianzhi malleable iron pipe fittings use KTH350-10 as the primary material.

(2) Cast iron grades KTZ450-06, KTZ550-04, KTZ650-02, KTZ700-02: manufacture castings with higher strength requirements and better wear resistance, such as gearboxes, camshafts, crankshafts, connecting rods, piston rings...

(3) Cast iron grades KTB380—04, KTB380—12, KTB400—05, KTB450—07: This is white-core malleable cast iron, which is limited to thin-walled castings and castings that do not require heat treatment after welding. Due to the complicated process, Less application in mechanical manufacturing.

   Ductile iron