OEM custom spheroidal graphite (SG) ductile nodular cast iron castings by sand casting process.
Sand casting is a tranditional but also modern casting process. It uses green sand (moist sand) or dry sand to form the molding systems. The green sand casting is the oldes casting process used in history. When making the mold, the patterns made of wood or metal should be produced in order to form the hollow cavity. The molten metal then pour into the cavity to form the castings after cooling and solidification. Sand casting is less expensive than other casting processes both for mold development and unit casting part. The sand casting, always mean the green sand casting (if no special description). However, nowadays, the other casting processes are also use the sand to make the mold. They have their own names, such as shell mold casting, furan resin coated sand casting (no bake type), lost foam casting and vacuum casting.
What Are The Advantages of Sand Casting?
✔ Lower Cost due to its cheap and recyclable mold materials and simple production equipment.
✔ Wide range of unit weight from 0.10 kg to 500 kgs or even bigger.
✔ Various Structure from simple type to complex type.
✔ Suitable for production requirements of various quantity.
Ductile cast iron, which is also called nodular cast iron, spheriodal graphite cast iron or just SG iron for short, represent a group of cast 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. So generally speaking, if the ductile iron could meet your requirements, the ductile iron could be your first choice, instead of carbon steel for your castings.
Raw Materials Available at Sand Casting Foundry of RMC:
• 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.
