Ductile Iron Sand Casting Parts

Ductile iron casting parts by sand casting process at the foundry of China

Ductile cast iron, which is represent a group of cast iron, also called nodular iron. Nodular cast iron obtains nodular graphite through spheroidization and inoculation treatment, which effectively improves the mechanical properties of the cast iron, especially the plasticity and toughness, so as to obtain higher strength than carbon steel.

Ductile iron castings have better shock absorption performance than carbon steel, while carbon steel castings have much better weldability. And to some extent, the ductile iorn castings could have some performances of resistanting wear and rust. So the ductile iron casting could be used for some pump housings or water supply systems. However, we still need to make precautions for protecting them from wearing and rust.

Ductile iron is not a single material but is part of a group of materials which can be produced to have a wide range of properties through control of the microstructure. The common defining characteristic of this group of materials is the shape of the graphite. In ductile irons, the graphite is in the form of nodules rather than flakes as it is in grey iron. The sharp shape of the flakes of graphite create stress concentration points within the metal matrix and the rounded shape of the nodules less so, thus inhibiting the creation of cracks and providing the enhanced ductility that gives the alloy its name.

▶ Raw Materials Available for Sand Casting

• Gray Iron:  GJL-100, GJL-150, GJL-200, GJL-250, GJL-300, GJL-350

• Ductile Iron: GJS-400-18, GJS-40-15, GJS-450-10, GJS-500-7, GJS-600-3, GJS-700-2, GJS-800-2

• Aluminium and Their Alloys

• Other Materials and Standards on request

▶ Capabilities of Sand Casting moulded by hand:

• Max Size: 1,500 mm × 1000 mm × 500 mm

• Weight Range: 0.5 kg - 500 kg

• Annual Capacity: 5,000 tons - 6,000 tons

• Tolerances: On Request.

▶ Capabilities of Sand Casting by Automatic Molding Machines:

• Max Size: 1,000 mm × 800 mm × 500 mm

• Weight Range: 0.5 kg - 500 kg

• Annual Capacity: 8,000 tons - 10,000 tons

• Tolerances: On Request.

▶ Main Production Procedure

• Patterns & Tooling Design → Making Patterns → Moulding Process → Chemical Composition Analysis → Melting & Pouring → Cleaning, Grinding & Shot Blasting → Post Processing or Packing for Shipment

▶ Sand Casting Inspection Capabilities

• Spectrographic and manual quantitative analysis

• Metallographic analysis

• Brinell, Rockwell and Vickers hardness inspection

• Mechanical property analysis

• Low and normal temperature impact testing

• Cleanliness inspection

• UT, MT and RT inspection

▶ Post-Casting Process

• Deburring & Cleaning

• Shot Blasting / Sand Peening

• Heat Treatment: Normalization, Quench, Tempering, Carburization, Nitriding

• Surface Treatment: Passivation, Andonizing, Electroplating, Hot Zinc Plating, Zinc Plating, Nickel Plating, Polishing, Electro-Polishing, Painting, GeoMet, Zintec

• Machining: Turning, Milling, Lathing, Drilling, Honing, Grinding,

▶ General Commerial Terms

• Main workflow: Inquiry & Quotation → Confirming Details / Cost Reduction Proposals → Tooling Development → Trial Casting → Samples Approval → Trial Order → Mass Production → Continuous Order Proceeding

• Leadtime: Estimatedly 15-25 days for tooling development and estimatedly 20 days for mass production.

• Payment Terms: To be negotiated.

• Payment methods: T/T, L/C, West Union, Paypal.