The Difference Between Ductile Cast Iron and Malleable Cast Iron

by | Nov 1, 2022 | Industry Knowledge

JIANZHI, a leading pipe fittings manufacturer, is well-versed in the distinctions between ductile and malleable iron. Read on if you’re curious about the same thing!

Full specifications, in-stock, from the leading manufacturers of Malleable Cast Iron and ductile iron pipe fittings, flanges, elbows, tees, reducers, heads, and manholes. Manufacturing facility for flange pipe fittings with high-quality components and cutting-edge technology; eager to serve customers with varying tastes.

Malleable Cast Iron

1. Overview of malleable cast iron

Pipe fittings from Jianzhi are made primarily of malleable cast iron, also known as malleable iron. The cementite is decomposed into flocculent graphite during malleable annealing, which is performed first by pouring malleable iron into white iron castings. Meltable cast iron’s chemical make-up

, where C=2.2–2.8%, Si=1.0–1.8%, Mn=0.3–0.8%, S=0.2–0.1%, and P=0.1–0.2%.

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. Features and applications of malleable cast iron

2.1 Malleable iron features

White cast iron has terrible cutting performance. As a result of the graphite in malleable cast iron being in the form of flocs, it has a modest splitting impact on the matrix, but following high-temperature tempering, the material gains greater strength and plasticity and can be cut. When compared to grey cast iron, its plasticity and durability are noticeable improvements. However, cast iron, despite its malleability, cannot be forged. Each type of malleable cast iron has a unique matrix structure and set of properties. Black-core malleable cast iron has greater flexibility and toughness, while pearlite malleable cast iron has greater strength, hardness, and wear resistance.

Fabrication and other applications of malleable iron

Low in strength and hardness but high in flexibility and toughness, black-hearted malleable cast iron is surprisingly versatile. It is put to use in areas that experience significant levels of impact and vibration yet have relatively light loads.

Pearlite matrix malleable cast iron is used for important parts that require a high load capacity, a strong resistance to wear, and a specified toughness.

Several malleable castings

  1. Pipe fittings, low-pressure valves, rear axle housings of cars and tractors, steering mechanisms, machine tool parts are made from KTH300-06, KTH330-08, KTH350-10, and KTH370-12 cast iron. Jianzhi pipe fittings are made of KTH350-10.
  2. Cast iron grades KTZ450-06, KTZ550-04, KTZ650-02, KTZ700-02: gearboxes, camshafts, crankshafts, connecting rods, piston rings…
  3. KTB380—04, KTB380—12, KTB400—05, KTB450—07: White-core malleable cast iron is confined to thin-walled castings that don’t need heat treatment after welding. Due of complexity, mechanical manufacturing uses less.

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Ductile iron

Overview of ductile iron

Keith Millis discovered ductile iron in 1943. It’s also known as nodular cast iron, spheroidal graphite iron, and SG iron. It’s used to make branch pipe fittings.

Nodular cast iron is a 1950s high-strength material. Its performance rivals steel’s. Its great performance was recognized.

Used to cast items with high abrasiveness requirements. Nodular cast iron has developed quickly.Grey cast iron is popular. “Substituting iron for steel” refers to ductile iron.

The performance of ductile iron

Ductile iron castings are employed practically everywhere that high strength, plasticity, toughness, wear resistance, severe thermal and mechanical stress, high or low-temperature resistance, corrosion resistance, and dimensional stability are required. There are several grades of ductile iron with different mechanical and physical qualities to meet product needs.

Most ISO1083 ductile iron castings are non-alloyed. This category includes high-strength grades with tensile strengths above 800 N/mm2 and 2% elongation. High-plasticity grades have elongations greater than 17% and reduced strength (minimum 370 Newton/mm2). Designers don’t chose materials based just on strength and length. Yield strength, elastic modulus, wear resistance, fatigue strength, hardness, and impact characteristics are also crucial. Corrosion, oxidation, and electromagnetic characteristics may also be important. Austempered ductile iron was designed for unique uses. Austenitic ductile irons are listed in internat.

Related JIANZHI Malleable Iron Pipe Fittings

4 Way Pipe Fitting Equal Cross

Pipe Tee

pipe elbow 90 degree

socket pipe

Catalog-Jianzhi Malleable Iron Pipe Fittings 2022.pdf

Jianzhi strictly controls the cost to ensure a stable supply of high-quality products and fast delivery. if need Ductile Cast Iron and Malleable Cast Iron pipe fittings, welcome to contact us!

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