+86-731-82236721 anshanchen@hneco.com
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Hot Products
  • Products type:

    aluminum alloy castings, aluminum die castings, ordinary castings, ductile castings etc

    MaterialGGG40~70, QT400~700, ZL108

    Surface Treatment: Spray Painting, Spray, anti-rust oil, black oxidation 

    Application: agricultural and gardening machinery

    MOQ: 500pcs

  • Products type:

    cylindrical gears,bevel gears,worm gears, sprocket and pinions etc

    Material: alloy steel

    Heat treatment: carburizating, quenching

    Surface Treatment: shot blast 

    Module: 0.5M-6M

    Accuracy class: GB grade 6-7

    Application: agricultural and gardening machinery

    MOQ: 500pcs

  • Features: We produce precision custom-made gearbox according to customer’s drawings. We can produce gearbox which varies speed through gears, worm gears or worm shafts

    Material: according to your request

    Surface Treatment: spray Painting, Spray, anti-rust oil

    Application: agricultural and gardening machinery

    MOQ: 100pcs

  • Capability: Mass production of all kinds of cold stamping and cold extrusion parts .

    Material: steel plate

    Surface Treatment: electrophoresis, spray painting, spray, anti-rust oil, galvanized

    Application: agricultural and gardening machinery

    MOQ: 200pcs

  • Products type:

    non-standard shape discs parts, pulleys etc

    Features: The V-groove of pulleys is extruded with steel plates, pulleys produced with this technology are more durable and no broken.

    Materialsteel plate

    Surface Treatment: electrophoresis, spray painting, spray, anti-rust oil, galvanized

    Application: agricultural and gardening machinery

    MOQ: 500pcs


  • Products type:

    cylindrical gears,bevel gears,worm gears, sprocket and pinions etc

    Material: alloy steel

    Heat treatment: carburizating, quenching

    Surface Treatment: shot blast 

    Module: 0.5M-6M

    Accuracy class: GB grade 6-7

    Application: agricultural and gardening machinery

    MOQ: 500pcs

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Ductile Casting
2019-02-13 12:02:15

Ductile casting still maintains nice casting properties, shock absorption, antifriction, low notch sensitivity, machinability and so on. However, compared with gray cast iron, there are some defects such as high shrinkage, poor fluidity and large tendency of white mouth, so the requirements for raw materials, smelting and casting process are also higher.

Ductile iron is widely used in machinery manufacturing, shipbuilding, metallurgy, chemical and other industries to produce important parts with complex forces and high performance requirements, such as replacing cast steel and forged steel, making diesel crankshafts, connecting rods and gears.

In ductile iron casting, since the graphite is spherical and has the smallest surface area, the splitting effect on the substrate is greatly reduced compared with the flake graphite, and the stress concentration phenomenon is also greatly reduced, thereby improving the bearing capacity of the substrate.

Therefore, the mechanical properties of ductile iron are much higher than that of gray cast iron, the yield strength ratio reached 0.7 to 0.8, especially the strength is close to that of steel. Plasticity and toughness, although much better than gray iron, are still worse than steel. In addition, the mechanical properties can be further improved by changing the matrix structure of nodular cast iron and the roundness, size and distribution of nodular graphite.


Heat treatment of ductile casting:

The heat treatment of ductile cast iron is similar to that of steel, but due to the high content of carbon and silicon and the presence of graphite, the heat treatment temperature is slightly higher, the holding time is longer, and the heating speed and cooling speed are slower.

1. Annealing

The annealing of ductile iron is to obtain ferrite matrix and improve ductility and toughness.

2. Normalizing

The normalizing of nodular cast iron is to increase the number of pearlite in the matrix structure, refine the structure, and improve the strength and wear resistance of nodular cast iron. After normalizing, stress relief tempering is often used.

3. Tempering

The purpose of quenching and tempering treatment of ductile iron is to obtain tempered sorbite matrix and obtain high comprehensive mechanical properties. For the process, quenching heating temperature of 860 ~ 900 , oil cooling, 550 ~ 600 tempering.

4. Isothermal quenching

The purpose of isothermal quenching of ductile iron is to obtain lower bainite matrix with high hardness, high strength and good toughness. For its process, quenching temperature is 850 ~ 900 , immediately after the insulation in the 250 ~ 350 in the salt bath isothermal 1 ~ 1.5 h, then take out for air cooling.


Hunan New Era technologies Co.,Ltd has been producing casting parts for decades. We offer CNC machining parts, metal stamping partscasting parts, ductile casting, grey casting parts, and other customized parts. Interested in well-qualified ductile iron casting technology and parts? Come to know us www.hneco.com and welcome your inquiry! 

Ductile Casting

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CONTACT HUNAN NEW ERA
Precision Components Manufacturer
+86-0731-82236721
+86-0731-82225090
Add:158, Yuelu Road, Changsha, Hunan, China
P.C: 410013
Fax:+86-4008266163-02205
Email: anshanchen@hneco.com